PH levels affect how responsive enzymes are.Enzymes lose their ability to function when the pH is either too high or too low because this alters the charges at the specific active site of the enzyme.
Why does low pH result in decreased enzyme activity?
The protein is forced to unfold at extremely low pH levels as a result of this interference, and the enzyme is then unable to catalyse the reaction because the shape of the active site is no longer complementary to the substrate molecule. The enzyme is no longer active.
The pH of the media affects how quickly an enzyme reacts. Every enzyme has an ideal pH range where the rate of the enzymatic reaction is at its highest. The rate of an enzyme process reduces with increasing or decreasing pH. The ideal pH range for most enzymes is between pH 5 and pH 9.
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a certain liquid has a normal boiling point of and a boiling point elevation constant . calculate the boiling point of a solution made of of potassium bromide () dissolved in of . round your answer to significant digits.
The boiling point of the solution is 136.5°C.
The boiling point of X: 134.5°C
Molal boiling point elevation constant (Kb): 1.36·°C·kg. mol⁻¹
We can calculate the elevation in the boiling point (ΔT) using the following expression.
ΔT = Kb × m
where,
m is the molality
The molar mass of urea is 60.06 g/mol. The moles of urea corresponding to 76 g are:
76 g × (1 mol/60.06g) = 1.3 mol
The mass of the solvent (X) is 850 g = 0.850 kg.
The molality is:
m = 1.3 mol / 0.850 kg = 1.5 mol/kg
Then,
ΔT = Kb × m
ΔT = 1.36·°C·kg.mol⁻¹ × 1.5 mol/kg
ΔT = 2.0 °C
The boiling point of the solution is
134.5°C + 2.0°C = 136.5°C
The boiling factor of a substance is the temperature at which the vapor pressure of a liquid equals the stress surrounding the liquid and the liquid adjustments into a vapor. The boiling point of a liquid varies relying on the encompassing environmental stress.
The boiling factor for any material is the temperature point at which the material transforms into the gas segment inside the liquid segment. This takes place at one hundred stages centigrade for water. The boiling point of a natural substance is the temperature at which the substance transitions from a liquid to the gaseous phase. At this factor, the vapor strain of the liquid is the same as the applied stress at the liquid. The boiling factor at a stress of 1 ecosystem is called the normal boiling factor.
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Complete Question:
A certain substance X has a normal boiling point of 134.5°C and a molal boiling point elevation constant =Kb1.36·°C·kgmol−1. Calculate the boiling point of a solution made of 76. g of urea NH22CO dissolved in 850. g of X . Be sure your answer has the correct number of significant digits.
what is the difference between tonic water and club soda?
The difference with tonic water and club soda is that tonic water also has minute quantities of quinine. Quinine, a natural substance in cinchona tree bark, is responsible for the tonic's strong bitterness.
What uses are there just for tonic water?Drinking tonic water only has one biggest advantage, which is hydration. This should keep you nourished and improve your ability to concentrate more often than soda or juice because it's still water. It is kind of a this double sword because it has a sugar that is equivalent to those.
What draws Indians tonic water?The beverages had their start here within 1825 when British Army troops stationed in India started experimenting quinine with sugar, water, and gin to make an inadvertently tasty sundowner that also acted as a malaria preventative.
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a certain substance has a normal boiling point of and a molal boiling point elevation constant . a solution is prepared by dissolving some urea in of . this solution boils at . calculate the mass of urea that was dissolved. round your answer to significant digits.
The mass of urea that was dissolved is 636 grams.
The boiling point elevation of a solution can be calculated using the equation:
ΔTb = Kb * molality
Where ΔTb is the boiling point elevation, Kb is the molal boiling point elevation constant, and molality is the concentration of solute in the solution, expressed in moles of solute per kilogram of solvent.
The molality can be calculated from the mass of solute (m) and the mass of solvent (m0) using the equation:
molality = m / (m0 - m)
We know the boiling point of the solution and the boiling point of the pure solvent, so we can calculate the boiling point elevation:
ΔTb = 150.9°C - 150.4°C = 0.5°C
And then use the equation above to calculate the molality:
ΔTb = Kb * molality
0.5°C = 0.60°C·kgmol^-1 * molality
molality = 0.5°C / 0.60°C·kgmol^-1 = 0.83 mol/kg
Finally, we can use the equation for molality to calculate the mass of urea:
molality = m / (m0 - m)
0.83 = m / (750 g - m)
0.83 * (750 g - m) = m
m = 636 g
So, 636 grams of urea were dissolved in 750 grams of solvent X.
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Complete Question :
A certain substance X has a normal boiling point of 150.4°C and a molal boiling point elevation constant =Kb0.60·°C·kgmol−1. A solution is prepared by dissolving some urea NH22CO in 750.g of X. This solution boils at 150.9°C. Calculate the mass of urea that was dissolved.
what is the molarity of a 11.0 % by mass glucose (c6h12o6) solution? (the density of the solution is 1.03 g/ml .)
11.0 grams of glucose in 100 grams of solution.
Grams of H2O = 100 – 11.0 = 89 H2O
11.0 grams glucose x 1 mole glucose/ 180 grams = 0.0611 moles glucose
1.03 grams solution/ 1 mL solution x 1000 mL liter = 1030 grams solution/liter
[11.0 grams glucose/100 grams solution] x 1030 grams/liter =113.3 grams glucose/1 liter
113.3 grams glucose/1 liter x 1 mole glucose/180 g = 0.629 M
Molarity = 0.629
molality = moles of glucose/kilogram H2O
0.0611 moles/ 89 g H2O x 1000 g/1kilogram = 0.686 molality
A solution of glucose (C6H12O6) that is 11.0% by mass has a molarity of 11.0 grams of glucose per 100 grams of solution has 0.686 molality.
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Full question:
A) What is the molarity of a 10.5% by mass glucose (C6H12O6) solution (density of solution is 1.03 g/mL).
B) What is the molality of the above glucose solution
conclusions: in winter, you can buy a variety of salts to use on your sidewalk. two of the most popular choices are nacl and cacl2. which of the two salts is more effective? justify your answer.
Total 2 ions in water,
The greater the number of dissolved ions in water, the greater the disorder of the puddle, and the lower the freezing point.
when we spread cacl2 is a better road salt than Nacl because it makes more ions per formula unit of the salt dissolved.
A chemical response is a manner that leads to the chemical transformation of 1 set of chemical substances to any other. Classically, chemical reactions embody modifications that handiest involve the positions of electrons inside the forming and breaking of chemical bonds among atoms, without exchange to the nuclei (no change to the factors gift), and may regularly be described with the aid of a chemical equation. Nuclear chemistry is a sub-area of chemistry that involves the chemical reactions of risky and radioactive elements where both electronic and nuclear modifications can arise.
The substance (or materials) initially worried in a chemical reaction are called reactants or reagents. Chemical reactions are commonly characterized by using a chemical trade, and they yield one or greater merchandise, which usually have residences exclusive from the reactants. Reactions often encompass a sequence of man or woman sub-steps, so-referred to as fundamental reactions, and the statistics on the correct path of movement are part of the response mechanism.
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if you have 1.0 mol of each of the following compounds, which will have the greatest mass? A. NO
B. NO2
C. N2O
D. N2O5
N2O5 has the highest mass if you combine 1.0 mol each of the preceding chemicals, according to the supplied statement.
What purpose does N2O5 serve?Dinitrogen pentoxide (N2O) applications
used in high-fuel rockets as a powerful oxidizer. used throughout fluids that are not dependent on water to make it easier to nitrate compounds that are extremely sensitive to water. Nitrating agent used in contemporary synthetic organic chemistry.
Why is N2O5 so acidic?Since the oxides in an item's higher oxidation number are more acidic than those in its lower oxidation state, dinitrogen result in higher levels the most caustic oxide compared to no2 and nitrogen tetraoxide. N 2 O 5 becomes the most acidic dioxide as a result.
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which particle is not used in calculating the atomic mass?
The smallest and least massive atomic particle is the electron, which is negatively charged.Due to the electron's extremely small mass, it is not counted inside the element's atomic number.
What particle does not add to mass?Although they are very small and possess a mass of 1/1850 of that of a protons or neutron, electrons carry a negative charge.Since they are so tiny, they do not, in reality, add to the weight of the atom.
What three particles make up an atom?These particles are frequently referred to it as subatomic particles since they are the building blocks of atoms.There are protons, neutrons, and electrons, three types of subatomic particles.Protons and electrons, two of a subatomic particles, each have an electrical charge of one or the other.
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In 1863 John Newlands presented a paper, classifying the 56 discovered elements into 11 groups based on similar physical properties. He noted that pairs of similar elements existed which differed by some multiple of eight in atomic weight. In 1864 Newlands published his version of the periodic table and proposed the Law of Octaves, stating that any given element exhibits analogous behavior to the eighth element following it in the table. Dimitri Mendeleev noticed patterns in the properties and atomic weights of halogens, alkali metals and alkaline metals. He also observed similarities between the series CI-K-Ca, Br-Rb-Sr and I-Cs-Ba. In an effort to extend this pattern to other elements, Mendeleev created a card for each element, containing the element's symbol, atomic weight, and chemical and physical properties. As Mendeleev arranged the cards in order of ascending atomic weight, grouping elements of similar properties together, the periodic table was formed. Although Mendeleev's table demonstrated the periodic nature of elements, during the next century, scientists accurately explained why the properties of the elements recur periodically.
Rutherford discovered nuclear charge and this charge, later termed the atomic number, was used to number the elements within the periodic table. Finally variations of the same elements, or isotopes having the same number of protons and electrons but differing numbers of neutrons, were discovered. How did later discoveries change the model of Mendeleev's periodic table to what we accept today?
. what quantity of energy in kj does it take to convert 0.250 kg of solid methanol (ch3oh) at 120 k to gaseous methanol at 400 k?
The total energy required to convert 0.250 kg of solid methanol to gaseous methanol is 0.066 kJ + 47.49 kJ + 3.41 kJ = 51.00 kJ.
To convert 0.250 kg of solid methanol to gaseous methanol, we need to perform three separate energy exchanges: 1) melting the solid to liquid, 2) heating the liquid to its boiling point, and 3) converting the liquid to gas.
First, we need to melt the solid methanol at 120.0 K to liquid methanol at 176.0 K. This requires an energy transfer of 0.250 kg * 2.2 kJ/mol / (32.04 g/mol) = 0.066 kJ.
Next, we need to heat the liquid methanol from 176.0 K to 338.0 K. This requires an energy transfer of 0.250 kg * (81.3 J/mol K) * (338.0 K - 176.0 K) / (32.04 g/mol) = 47.49 kJ.
Finally, we need to convert the liquid methanol to gas at 338.0 K to 400.0 K. This requires an energy transfer of 0.250 kg * 35.2 kJ/mol / (32.04 g/mol) = 3.41 kJ.
The total energy required to convert 0.250 kg of solid methanol to gaseous methanol is 0.066 kJ + 47.49 kJ + 3.41 kJ = 51.00 kJ.
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Complete question:
What quantity of energy in kJ does it take to convert 0.250 kg of solid methanol at 120.0 K to gaseous methanol at 400.0 K? Molar mass of methanol = 32.04 g/mol
Melting point - 176.0 K
Boiling point - 338.0 K
Heat of fusion - 2.2 kJ/mol
Heat of vaporization - 35.2 kJ/mol
Specific heat (solid) - 105 J/mol K
Specific heat (liquid) - 81.3 J/mol K
Specific heat (gas) - 48.0 J/mol K
which of the following is a component of pancreatic juice? (read choices carefully) group of answer choices bicarbonate (to increase ph) gastric protease hydrochloric acid (to decrease ph) hydrochloric acid (to increase ph) bicarbonate (to decrease ph)
Answer:
Bicarbonate (to decrease pH).
How many moles of SO4(it’s a little 4) are in 19.20 grams of SO4(little 4)?
According to the mole concept, there are 0.2 moles of SO₄ in 19.20 grams of SO₄.
What is a mole?Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.
It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.
Number of moles is given as mass/molar mass= 19.20/96=0.2 moles.
Thus, there are 0.2 moles of SO₄ in 19.20 grams of SO₄.
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What periodic trend does the atomic radius follow?
OA. It stays the same across the table.
OB. It decreases from top to bottom.
C. It increases from left to right.
OD. It decreases from left to right.
Answer:
OD. It decreases from left to right.
Explanation:
Radius decreases from left to right since proton counts increase but your shell stays same (same energy level)
Answer:
OD. It decreases from left to right.
Explanation:
pls tell me if wrong have a good day/night<3
each student in a class placed a 2.00 g sample of a mixture of cu and al in a beaker and placed the beaker in a fume hood. the students slowly poured 15.0 ml of 15.8 m hno3(aq) into their beakers. the reaction between the copper in the mixture and the hno3(aq) is represented by the equation above. the students observed that a brown gas was released from the beakers and that the solutions turned blue, indicating the formation of cu2 (aq). the solutions were then diluted with distilled water to known volumes. the students determined that the reaction produced 0.010 mol of cu(no3)2 . based on the measurement, what was the percent of cu by mass in the original 2.00 g sample of the mixture?
The percent of Cu by mass in the original 2.00 g sample of the mixture is approximately 120.75%.
Determining the Percentage of Copper in a MixtureIn this experiment, students placed a 2.00 g sample of a mixture of copper (Cu) and aluminum (Al) in a beaker and added 15.0 ml of 15.8 M HNO3(aq) to it. The reaction between the copper and the HNO3(aq) produced a blue solution, indicating the formation of Cu(NO3)2, and a brown gas, which was nitrogen dioxide (NO2). The students then diluted the solution with distilled water to a known volume and determined that the reaction produced 0.010 mol of Cu(NO3)2. By using the molar mass of Cu(NO3)2, the mass of copper in the original sample was calculated as 2.415 g. Finally, the percentage of copper in the original 2.00 g sample of the mixture was determined to be approximately 120.75% by dividing the mass of copper by the total mass of the sample and multiplying it by 100%.
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a 25.0-ml sample of 1.00 m nh3 is titrated with 0.15 m hcl. what is the ph of the solution after 15.00 ml of acid have been added to the ammonia solution? [kb(nh3)
After 15.00 ml of acid has been added to the ammonia solution, the solution's ph is 10.26.
What is the formula for pH value?The pH scale is an easy way to show how acidic or basic a solution is. The pH of a solution can be determined by taking the negative logarithm of the concentration of the hydronium ion, or pH = -log[H3O+].
What is pH as a whole?Potential of Hydrogen is the full form of pH. The negative logarithm of the concentration of H+ ions is the pH. As a result, the power or strength of hydrogen is used to explain pH's meaning. The chemical conditions of a solution are reflected in the pH, an important quantity. Chemical behavior, microbial activity, the availability of nutrients, and biological functions are all influenced by pH.
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If we triple the number of moles in the gas vessel at constant pressure, what would the new volume be?
If we triple the number of moles in the gas vessel at constant pressure, the new volume of gas will be three times the original volume.
PV = nRT is the equation for an ideal gas. In this equation, P stands for the ideal gas's pressure, V for the ideal gas' volume, n for the total amount of the ideal gas expressed in moles, R for the universal gas constant, and T for temperature.
When the pressure is expressed in kPa, the ideal gas constant is calculated to be 8.314J/Kmol.
The volume is inversely proportional to the number of moles if we consider the pressure to be constant.
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what volume (in ml) of 0.7 m barium hydroxide would neutralize 57 ml of 3.694 m hydrobromic acid? enter to 1 decimal place.
[tex]41.4 ml[/tex] volume of [tex]0.7m[/tex]barium hydroxide would neutralise [tex]57ml[/tex] of [tex]3.694m[/tex] Hydrobromic acid.
How to calculate the volume of barium hydroxide?
To calculate the volume of barium hydroxide needed to neutralise [tex]57 ml[/tex] of hydrobromic acid, we use the equation: [tex]M1V1 = M2V2[/tex]
where M1 and V1 represent the molarity and volume of the Hydrobromic acid, and M2 and V2 represent the molarity and volume of the barium hydroxide.
Substitution of the given values:
[tex]3.694 M x V2 = 0.7 M x 57 ml[/tex]
[tex]V2 = 41.4 ml[/tex]
Therefore, [tex]41.4 ml[/tex] of [tex]0.7 M[/tex] barium hydroxide is needed to neutralise [tex]57 ml[/tex] of [tex]3.694 M[/tex] Hydrobromic acid.
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the very common mineral shown in this photograph is light colored, transparent, has a hardness of seven, and fractures rather than cleaves. it does not effervesce. what mineral is it?
Quartz is the translucent, light-colored crystal with a strength of seven that is depicted in this image.
What purposes does the mineral quartz serve?Quartz is used in a broad variety of industries, including jewelry production and gemstones for its ability to gleam, brick manufacturing inside the refractory industry because of its physical toughness, and watches & clocks because of its piezoelectric feature.
A mineral or even a rock, is quartz?Typical minerals include calcite, quartz, feldspar, silica, amphibole, and olivine. An accumulation of one or more minerals, or a mass of undifferentiated mineral materials, is referred to as a rock.Sandstone, granite, basalt, and limestone are examples of common rocks.
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8. metallic gold reacts in a 1:1 stoichiometric ratio with metallic cesium to form the salt csau. this material is transparent with mechanical properties similar to that of table salt. the other two group 11 elements, silver and copper do not react with cesium in this manner. a. explain why gold is the only group 11 element with an isolable 1- anion. b. based on the reason you cited for part a, would you expect uranium metal to also have a high enough electrophilicity to form anions? why or why not. c. csau has the same lattice type as csi meaning that the x-ray diffraction pattern of csau has reflections in similar patterns to those of csi, but the diffraction patterns are slightly different. what are differences in the diffraction patterns between these two materials? why?
A. Gold is the only group 11 element that forms a stable 1- anion because it has the highest electrophilicity among the group 11 elements. Electrophilicity is the measure of an element's ability to attract electrons, and gold has the highest electrophilicity due to its electron configuration and its high electron affinity, which is the energy released when an electron is added to a neutral atom. Gold's high electrophilicity allows it to react with cesium, which is a highly electropositive metal, and form anionic species, such as CSau^-.
B. Based on the reason cited for part A, we would not expect uranium metal to form anions. Uranium has a lower electrophilicity than gold and its electron affinity is also lower, meaning it would be less likely to attract electrons from other elements and form anions.
C. The differences in the diffraction patterns between CSi and CSau are due to the fact that the two materials have different crystal structures. CSi has a sodium chloride-type crystal structure, while CSau has a cesium chloride-type crystal structure. This difference in crystal structure results in slight differences in the spacing between the atoms in the two materials, which leads to differences in the diffraction patterns. The diffraction pattern of a material provides information about its crystal structure, so the slight differences in the diffraction patterns between CSi and CSau are a result of the difference in their crystal structures.
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When ethane ( ) burns, it produces carbon dioxide and water: how many moles of water will be produced when 8 moles of ethane are burned? a. 48 moles b. 56 moles c. 64 moles d.24 moles
Due to the ethane balanced equation's 1:1 mole ratio between CO and CO2, 4.60 mol of CO will completely burn to create 4.60 mol of CO2.
When 14 moles of oxygen and 5 moles of ethane are combined, how many moles of carbon dioxide result?800K is achieved by heating 5 moles of ethane and 14 moles of oxygen. B: Include 2 moles of carbon dioxide in the mixture used for the reaction. C: The reaction will now start and result in the production of 12 moles of ethane and 46 moles of carbon dioxide.
C2H6 O2 CO2 H2O is what kind of reaction?An illustration of a combustion reaction is shown here, in which ethane reacts with oxygen to produce carbon dioxide and water.
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what is the temperature change if the system is a monatomic gas?
The law VP= constant states that one mole of an ideal monatomic gas at temperature T0 expands slowly.
When an ideal monatomic gas changes from one state to another, its temperature doubles but its pressure increases by about two times. The process's entropy change will be (R=2 cal/mol K). Examples of monatomic gases are helium, radon, and neon, which are considered noble gases. Because monoatomic gases lack any rotational or vibrational energy, their thermodynamic behavior is much simpler than that of polyatomic gases. The only chemical elements that, at standard temperature and pressure (STP), we can claim are stable for single-atom molecules are the noble gases.When an ideal monatomic gas changes from one state to another, its pressure increases by around two times while its temperature doubles. The process's change in entropy will be (R=2 cal/mol K).
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you have 76.6 grams of silver and have raised it to its melting point. how much additional heat is required to melt the silver?
No additional heat is required to melt the silver as it has already been raised to its melting point.
What is the melting of silver?The melting point of silver is 961.8 °C. Hence, all that is needed is to keep the silver at that temperature until it has completely melted.
The calculation involves determining the temperature at which the silver needs to be heated to in order to melt it. This can be done by calculating the energy required to raise the silver's temperature from its initial state to its melting point.
The energy required is calculated using the formula:
[tex]Energy = Mass * Specific Heat Capacity * Change in Temperature[/tex]
The equation would be:
[tex]Energy = 76.6 grams * 0.235 J/g°C * (961.8 °C - Initial Temperature)[/tex]
The initial temperature will depend on the temperature of the environment the silver is in before it is heated. It can be used to determine how much energy must be added to the silver in order to raise it to its melting point.
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the lighting of a match is an example of which of the following? select the correct answer below: a physical property an extensive property a physical change a chemical change
The correct answer is option d. The lighting of a match is an example of a chemical change.
Chemical change is referred as the chemical composition in which a substance is altered, which lead to the formation of new substances with different properties.
In the lighting a match, the reaction occured between the phosphorus sulfide on the match head and the oxygen in the air results in the production of heat and light, This reaction results in a change in the chemical composition of the match and the production of new substances such as sulfur dioxide and other oxidized sulfur compounds.
A chemical reaction is defined as a process in which one or more substances, which is also called as reactants, are converted to one or more different substances, known as products. Substances are either chemical elements or compounds.
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Which of the substances have a standard enthalpy of formation (NHf) equal to zero?a. C (diamond).b. F2(g).c. NH3(g)d. Hg (l).
From the given list of compounds, [tex]F_2[/tex](g) and Hg(l) are at their standard state and therefore have a standard enthalpy of formation equal to zero.
The enthalpy change required to produce one mole of a compound from an element in its standard state is known as the standard enthalpy of formation. The standard states represent the shape an element would take at 1 bar of pressure and 25 °C. Since the energy would be different for the ridiculous reaction carried out with the diamond form of carbon, carbon is designated as graphite. Under normal circumstances, hydrogen exists as a molecular gas, thus this form is necessary for the typical reaction.
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if a compound has four degrees of unsaturation and shows signals in its 1h nmr spectrum between 7.0 - 8.0 ppm, what structural feature is likely to be present in the compound?
Both compounds will exhibit five signals if a chemical exhibits signals in its 1h nmr spectrum between 7.0 and 8.0 ppm and has four degrees of unsaturation.
There are four distinct signals in the 1H NMR spectrum in all. In the 2,2-dibromopropane proton NMR spectrum, there will only be one singlet as a result. Therefore, the appropriate response is option d. One way to estimate the overall amount of hydrogens in a sample is to divide the integrated strength of a signal in a 1H NMR spectrum by the number of hydrogens that gave rise to the signal (this does not apply to 13C NMR). Two signals can be seen in the H NMR spectra of butane. The molecule has a plane of symmetry.
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Whats wrong with the KCl in the water
The presence of KCl in water is not inherently problematic, but it can cause issues depending on the specific circumstances and the intended use of the water.
Theoretically, there shouldn't be anything inherently "wrong" with potassium chloride (KCl) in water. KCl is a common salt that is soluble in water, meaning it dissolves in water to form a clear, homogeneous solution. The solubility of KCl in water depends on various factors such as temperature, pressure, and the presence of other dissolved substances. However, in certain specific circumstances, the presence of KCl in water can lead to issues.
For example, if the concentration of KCl in water is too high, it can cause the water to become saturated and can lead to the precipitation of solid KCl. This can cause scaling and deposit buildup on surfaces and equipment, leading to operational problems in industrial processes. The dissolution of KCl in water is a simple chemical process that results in the formation of a clear, homogeneous solution.
The reaction is not spontaneous and does not produce an explosion and can be safely carried out under normal conditions. It's important to note that while some chemical reactions can be exothermic and release heat, the dissolution of KCl in water is not one of them.
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if you have 10.0 grams of a mixture of salt and water and you find that there are 1.3 grams of salt in the mix, what is the percent composition of salt in the original mixture? what is the percent composition of the water?
If 10.0 grams of mixture of salt and water and you find that there are 1.3 grams of salt in the mix, the percent composition of salt is 13 %. The percent composition of the water is 87 %.
The total mass of the mixture = 10 grams
The mass of the salt = 1.3 grams
The percent composition of salt = ( mass of salt/mas of solution ) × 100%
The percent composition of salt = ( 1.3 / 10 ) × 100 %
The percent composition of salt = 13 %
The mass of the water = 10 - 1.3 = 8.7 grams
The percent composition of water = ( 8.7 / 10 ) × 100 %
The percent composition of water = 87 %
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if 1.44 moles of hcl is consumed in the chemical reaction above, how many grams of hcl are consumed? molar mass of hcl is 36.46 g/mol.
If 1.44 moles of HCl is consumed in the chemical reaction, 52.4064 grams of HCl are consumed.
The number of grams of HCl consumed can be calculated by multiplying the number of moles of HCl chemical by its molar mass. The molar mass of HCl is 36.46 g/mol.
So, to find the number of grams of HCl consumed, we can use the following formula:
= grams of HCl
= moles of HCl × molar mass of HCl
Putting the values, we get:
= Grams of HCl
= 1.44 moles × 36.46 g/mol
= 52.4064 g
Therefore, 1.44 moles of HCl is equivalent to 52.4064 grams of HCl.
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you titrate a 200 ml hbr solution with 0.5 m koh. if it takes 150 ml of koh to reach the equivalence point, what was the concentration of the original acid solution?
HBr's initial concentration was 0.375 M.
What is HBr solution?With the chemical formula HBr, HBr is a potent, colourless, and volatile inorganic acid that is also known as hydrobromic acid. It is an extremely caustic and reactive chemical that rapidly dissolves in water to produce a very acidic solution.
How do you determine it?The volume and molarity of the KOH solution injected during the titration can be used to compute the concentration of the initial HBr solution. The number of moles of KOH added is equal to the number of moles of HBr in the starting solution and is calculated by multiplying the amount of KOH used in the titration (150 ml) by its molarity (0.5 M).
Therefore, 0.5 M * 150 ml = 75.0 moles can be used to compute the moles of HBr. Since the HBr solution's initial volume was 200 ml, the concentration can be determined by dividing the HBr molecular weight by the volume, which equals 75.0 moles / 200 ml = 0.375 M.
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a. adding a uv absorbing coating to the plastic surface. b. including additives to the plastics composition that help prevent uv degradation. c. electrically connecting the plastic component to a sacrificial anode. which of the following approaches would be useful for improving a plastic's resistance to uv degradation? a. adding a uv absorbing coating to the plastic's surface. b. including additives to the plastic's composition that help prevent uv degradation. c. electrically connecting the plastic component to a sacrificial anode.
a.Adding a uv absorbing coating to the plastic's surface. b. including additives to the plastic's composition that help prevent uv degradation.
After an unforeseen period of time, UV radiation's peroxidative degradation, which results in the breaking of polymer chains, radical production, and molecular weight reduction, deteriorates mechanical qualities and renders materials worthless.
What substances are susceptible to UV degradation?
Numerous natural and synthetic polymers, including certain rubbers, neoprene, and polyvinyl chloride, are damaged by this process, known as UV degradation (PVC). These materials' colours may fade if exposed to too much light.
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which of the following statements about subatomic particles are true? i. protons and neutrons have charges of opposite signs but the same magnitude. ii. protons and neutrons have about the same mass. iii. a neutral atom always has the same number of neutrons and electrons.
The following statements about subatomic particles are true:
i. Protons and neutrons have charges of opposite signs but the same magnitude.ii. Protons and neutrons have about the same mass. iii. A neutral atom always has the same number of protons and electrons.The answer to the question is that protons and neutrons have charges of opposite signs but the same magnitude, protons and neutrons have about the same mass, and a neutral atom always has the same number of protons and electrons.
Protons have a positive charge of +1, while neutrons have no charge. Electrons have a negative charge of -1. Neutral atoms contain an equal number of protons and electrons, so that the overall charge of the atom is zero.
Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons, and thus have different atomic masses.
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