Phospholipids spontaneously form bilayers in aqueous solutions because their fatty acid tails are not highly soluble in water and exposed polar head groups that are interact with water.
What draws phospholipids to water?A glycerol molecule is linked to two hydrophobic fatty acid chains by a negatively charged phosphate group to create phospholipids (which is hydrophilic). Due to its negative charges, which easily communicate with polar water molecules, the hydrophilic portion of the phospholipid is attracted to water molecules.
What component of phospholipids is drawn to water?A single phospholipid molecule has two consecutive chains of fatty acids that make up the lipid "tails" and a phosphate group, which would be referred to as the "head," on the other end. The negatively charged phosphate group makes the head polar and hydrophilic, or "water loving," in origin. As a consequence, the water is dragged to the phosphate heads.
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how many protons electrons and neutrons are contained in a neutral atom of gold
The amount of protons, electrons and neutrons present in a neutral atom of gold are 79, 79, and 118 respectively.
Why is there 79 electrons in gold?The atomic number of a particular element, which can be discovered on the periodic table, can be employed to figure out the amount of protons in any given atom or element. Additionally, the amount of electrons in a stable, uncharged element is equivalent to the atomic number; in the case of gold, this means that there are 79 electrons.
How do electrons, protons, and neutrons work?A subatomic particle with such a negative charge is an electron. A subatomic particle that has a positive charge is called a proton. The strong nuclear force keeps protons together in the nucleus of an atom. A type of subatomic particle lacking charge is the neutron (they are neutral).
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how many moles of oxygen gas are in a balloon containing 20.0 grams of pure oxygen gas?
0.625 moles of gaseous oxygen are contained in a balloon holding 20.0 grams of oxygen.
What in chemical is a mole?Chemists use the mole, a highly significant measuring unit. Like a dozen eggs implies twelve eggs, owning a mole of anything indicates you possess 602,214,076,000,000,000,000,000 of that item. For exceptionally small objects like atoms, compounds, or other particles, chemists must estimate using moles.
We must divide a substance's weight by its molar mass to determine the number of moles. Oxygen gas (O2) has a molecular concentration of 32.00 g/mol.
20.0 g / 32.00 g/mol
= 0.625 mol
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How much volume does 3 moles of gas occupy at standard temperature and pressure?
At STP, 3 mol of gas will take up 67.2 L.
STP is defined as a temperature of 273.15 K and an absolute pressure of precisely 105 Pa. (100 kPa, 1 bar).
In a perfect world, the volume to mole ratio of a gas will be precise. The ideal gas law, also referred to as the general gas equation, employs an equation to explain the state of a fictitious ideal gas.
The ideal gas law states that the sum of the absolute temperature of the gas and the universal gas constant is equal to the product of the pressure and volume of one gramme of ideal gas molecules.
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if we triple the temperature and double the volume, what would the new pressure of the system be?
That the pressure doubles when the gas's volume is cut in half.
If gas volume and temperature are maintained constant, the formula demonstrates that pressure and volume are inversely proportional.
This implies that if volume decreases, pressure must increase. This implies that if pressure doubles, volume must be half, and if pressure is halved, volume must be doubled in order to maintain the K value.
If the volume is doubled and the pressure is tripled, the effect on the temperature will be 3 2 = 6 times. This is because for perfect gases, the temperature is directly related to both the volume and the pressure.
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a 4.3 g rock sample is added to a graduated cylinder filled with water, causing the level to increase from 10.3 ml to 12.4 ml. what is the density of the rock sample?
From the given variable values, we can calculate the density of the rock sample to be = 2047Kg/m^3
To solve this question, we recollect that density is the mass per unit volume of a substance and the SI unit of density is Kg/m^3 with symbol
The given variables are as follows
mass of rock sample = 4.3g
The volume displaced in the graduated cylinder is
(Final volume level of the cylinder) - (initial volume level of the cylinder)
12.4ml - 10.3 ml= 2.1ml = volume of the rock sample
Therefore, density = 4.3/2.1 = 2.047g/ml = or 1000×2.047 Kg/m^3 =2047Kg/m^3
Density of the rock sample is 2047Kg/m^3
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Calculate the molar mass of magnesium sulfate heptahydrate, mgso4·7h2o.
The molar mass of magnesium sulfate heptahydrate,MgSO₄·7H₂O is 246 g/mol. So option D is correct.
Molar mass of MgSO₄⋅ 7H₂O can be found as by calculating the masses of all the atoms in the formulae as follows;
mass of Mg = 24.305
mass of S = 32.065
mass of O = 16
so by putting all these in formula we can find the molar mass of MgSO₄·7H₂O as
Molar mass = 24.305 + 32.065 + 16×4 + 7 (1.008×2 +16)
Molar mass = 24.305 + 32.065 + 64 + 7 (18.016)
Molar mass = 24.305 + 32.065 + 64 + 126.112
Molar mass = 246.482 g /mol
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during glycolysis, glucose is converted to lactic acid, a molecule that can be used in either fermentation or respiration pathways.
False. Rather than lactic acid, glucose is changed to pyruvic acid during glycolysis.
Describe pyruvic acid.A 2-keto derivative of a propionic acid, pyruvic acid is the 2-oxo monocarboxylic acid. It is a byproduct of the glycolytic process. It functions as a cofactor and a fundamental metabolite. It is similar to the propionic acid in terms of function. It is a pyruvate's conjugate acid.
What effects does pyruvic acid have?The simplest -ketoacid, pyruvic acid, is essential for sugar metabolism. It is the end result of the anaerobic breakdown of glucose during glycolysis. During exercise, it is converted to lactic acid in the muscle.
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Which type of material does electricity move and flow through?
Producers
Conductors
Insulators
Energizers
Energizes so D is the answer
what functional group is polar and makes compounds more soluble in water
The alcohol functional group is polar and makes compounds more soluble in water.
Does water cause the dissolution of polar functional groups?According to the polarity of the systems, the simple rule "like dissolves like" applies: polar molecules tend to disperse in polar solvents (such as water and alcohols), while non-polar molecules tend to dissolve in non-polar solvents (e.g. hydrocarbon hexane).
What department is more polarized?Alkyl halides, ethers, amines, thiols, and alcohols. Because the bonding atoms' electronegativities differ more, these functional groups are noticeably more polar.
What substance is polar and increases the solubility of substances in water?Methanol is hence a polar solvent and polar solute that is miscible (soluble in water). For dissolving molecules with alcohol, amino, and acidic functional groups, it is the most polar organic solvent.
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the university chemical hygiene plan (chp) describes the policies, procedures, equipment and work practices that promote :
The university chemical hygiene plan (CHP) describes the policies, procedures, equipment and work practices that promote : safe handling, and use of chemicals in a laboratory setting.
The University Chemical Hygiene Plan (CHP) is a comprehensive document that outlines the policies, procedures, equipment, and work practices for promoting safe handling and use of chemicals in a laboratory setting. The CHP serves as a reference for employees, students, and researchers in the university to ensure that they understand the hazards associated with chemicals, the proper procedures for handling and storing them, and the measures in place to minimize risks and protect workers. The CHP may include guidelines for personal protective equipment, training and awareness programs, emergency response procedures, waste management practices, and equipment maintenance. It also defines the responsibilities of personnel in handling and using chemicals and the reporting procedures in case of accidents or incidents. The CHP is an important component of laboratory safety, and it is designed to reduce the risk of chemical exposure and injury. By following the guidelines outlined in the CHP, personnel can minimize the risk of exposure to hazardous chemicals and maintain a safe work environment.
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We can only do ideal calculations when we are at standard temperature and pressure. Group of answer choicesA) TrueB) False
We can only do ideal gas law calculations when we are at standard temperature and pressure,is True.
The following is the ideal gas equation: PV = nRT Where P is the ideal gas's pressure, V is the ideal gas' volume, n is the ideal gas' molecular weight, R is the gas constant, and T is the temperature. Ideal gas law is a precise approximation of the behaviour of several gases under various situations in thermodynamics. The Ideal Gas Equation combines several empirical laws, including Avogadro's, Gay- Lussac's, Boyle's, and Charle's laws. The equation of state for a fictitious ideal gas is known as the ideal gas law. Despite its many flaws, it is a decent approximation of the behaviour of several gases under various situations.
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what kind of spectra was analyzed to determine atomic numbers?
In particular, atomic spectra were examined in order to ascertain atomic numbers.
An atomic number is defined.A chemical element's atomic number is its position in the periodic table of elements, which places the elements in ascending order of the quantity of protons in their nuclei. As a result, the atomic number is also determined by the amount of proton, that is everytime equal to the amount of electrons in a neutral atom.
Why don't we use mass instead of the atomic number?Since atomic number is constant throughout all isotopes of any element and the atomic mass varies with each isotope, an atomic number is frequently more significant than the atomic mass.
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the volume of akshay's plasma was 3l before dr. witmer administered the iv. assume that there was complete mixing of the administered water with his plasma but no mixing with his interstitial fluid. calculate akshay's plasma osmolarity after the infusion mixed with his plasma, but before any water entered his rbc.
Akshay's plasma osmolarity after the infusion mixed with his plasma, but before any water entered his rbc is 6 osmol/L.
Osmolarity is a measure of concentration that reflects the solutions' osmoticity. Osmolarity is how osmolar concentration is expressed.
The osmolarity of Akshay's plasma after the infusion can be calculated using the following formula:
Osmolarity = 2 x [solute concentration]
where solute concentration is the concentration of the solutes in the plasma.
Assuming the IV contained isotonic saline with a concentration of 0.9%, then the solute concentration of Akshay's plasma would be 0.9/1000 * 3L = 0.0027.
Therefore, the osmolarity of Akshay's plasma after the infusion would be 2 x 0.0027 = 0.0054 osmol/L.
Akshay's plasma osmolarity after the infusion mixed with his plasma, but before any water entered his RBC = (3 L x 2 Osmol/L) = 6 osmol/L.
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which of the diethylbenzene isomers (ortho, meta, or para) corresponds to each set of 13c nmr spectral data? [a] 13c nmr signals: 15, 26, 126, 128, and 142 ppm [b] 13c nmr signals: 16, 29, 128, and 141 ppm [c] 13c nmr signals: 16, 29, 125, 127.5, 128.4, and 144 ppm
[A] [tex]${ }^{13} \mathrm{C}$[/tex] NMR signals: 15, 26, 126, 128, and 142 ppm ortho diethyl benzene.
[B] [tex]${ }^{13} \mathrm{C}$[/tex] NMR signals: 16, 29, 128, and 141 ppm para diethyl benzene.
[C] [tex]${ }^{13} \mathrm{C}$[/tex] NMR signals: 16, 29, 125, 127.5, 128.4, and 144 ppm meta diethyl benzene.
In ortho diethyl benzene, 5 types of carbon atoms are present. So, 5 peaks are obtained.
In meta diethyl benzene, 6 types of carbon atoms are present. So, 6 peaks are obtained.
In para diethyl benzene, 4 types of carbon atoms are present. So, 4 peaks are obtained.
Answer:
Ortho: [A]
[A] [tex]${ }^{13} \mathrm{C}$[/tex] NMR signals: 15, 26, 126, 128, and 142 ppm
As we know that 5 types of carbon atoms present with 5 peaks are obtained.
Then it undergoes ortho diethyl benzene.
Para: [B]
[B] [tex]${ }^{13} \mathrm{C}$[/tex] NMR signals: 16, 29, 128, and 141 ppm
As we know that 4 types of carbon atoms present with 4 peaks are obtained.
Then it undergoes para diethyl benzene.
Meta: [C]
[C] [tex]${ }^{13} \mathrm{C}$[/tex] NMR signals: 16, 29, 125, 127.5, 128.4, and 144 ppm
As we know that 6 types of carbon atoms present with 6 peaks are obtained.
Then it undergoes para diethyl benzene.
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your friend, a male soccer player weighing 86 kg, is trying to determine how many carbohydrates should be consumed 2 hours before his soccer game. based on his weight, how many grams of carbohydrate would you recommend for your friend 2 hours before the soccer game?A. 86-344 gramsB. 129-286 gramsC. 150-377 gramsD. 172-425 grams
It is advised that your friend take 172-425 grams of carbs, dependant on his size of 86 kg, two hours before to his soccer match. The ideal choice is D.
What makes a carbohydrate healthy?As a result of the vitamins, nutrients, and dietary fiber they provide, full grain, berries, and vegetables are regarded as healthy carbohydrates. Contrarily, processed or refined carbohydrates like white spaghetti, sweetened beverages, and desserts have little to no nutritious benefit and therefore to be avoided altogether.
What purposes do carbs serve?Carbohydrates carry out a variety of essential functions in your body. They are the main source of fuel for your brain's calorific values and give you energy for daily chores.
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Use stoichiometry calculations and show all work:
calculate how many grams of PbSO4 would be produced if 5.5 grams of LiNO3 were produced.
Reaction: Li2SO4(aq) + Pb(NO3)(aq) = 2LiNO3(aq) + PbSO4(s)
Answer:
Explanation:
The reaction you provided is a balanced chemical equation, meaning that for every mole of LiNO3 produced, an equal amount of PbSO4 is produced. However, since you only know the amount of LiNO3 produced (5.5 grams), you can use stoichiometry to find the amount of PbSO4 produced.
First, you need to convert the amount of LiNO3 to moles:
5.5 g LiNO3 / 6.939 g/mol = 0.796 mol LiNO3
Next, using the stoichiometry of the reaction, you can find the number of moles of PbSO4 produced:
0.796 mol LiNO3 * (1 mole PbSO4 / 2 moles LiNO3) = 0.398 moles PbSO4
Finally, you can convert the number of moles of PbSO4 to grams:
0.398 moles PbSO4 * 247.77 g/mol = 98.42 g PbSO4
So, if 5.5 grams of LiNO3 were produced, then 98.42 grams of PbSO4 would be produced.
to make up 1 l of a 0.5 m solution of edta starting with the free acid, approximately how much 10 m naoh will have to be added to adjust the ph to 7.0? do you expect this solution to have a ph-buffering capacity? explain.
To make up 1 L of a 0.5 M EDTA solution starting with the free acid, you would need to adjust the pH to 7.0 by adding 10 M NaOH. The amount of NaOH required will depend on the initial pH of the EDTA solution and the desired final pH.
As for whether the solution will have a pH buffering capacity, it depends on the range of the pH buffer. EDTA is a weak polyprotic acid with four dissociation constants, and its buffering capacity will be dependent on the ratio of the protonated to deprotonated form of EDTA at a particular pH.
A pH buffer is typically considered to have buffering capacity over a range of pH values close to the pKa of the buffer. Since the pKa values of the four acetic acid groups on EDTA range from 2.0 to 10.26, it's possible that the solution may have buffering capacity over a broad pH range, but it will depend on the final pH achieved after adding NaOH and the concentration of EDTA in the solution.
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--The given question is incomplete, the complete question is
"To make up 1 l of a 0.5 m solution of EDTA starting with the free acid, approximately how much 10 m NaOH will have to be added to adjust the ph to 7.0? do you expect this solution to have a ph-buffering capacity? the pkas of the four acetic acid groups on edta are 2.0, 2.67, 6.16 and 10.26."--
Examine the neutralization reaction,
Neutralization Reaction - Definition, Equation, Examples & Applications
What are the products of this reaction?
Responses
Acid and base
HOH only
water and salt
only salt
water and salt is the product of this reacti
The reagents and fecl3 are required for the chlorination of benzene via electrophilic aromatic substitution.a. Trueb. False
The statement is true because the reagents chlorine and FeCl3 are required for the chlorination of benzene via electrophilic aromatic substitution.
The chlorine atom acts as the electrophile and attacks the benzene ring, while the FeCl3 acts as a catalyst to facilitate the reaction. The chlorine atom then displaces one of the hydrogen atoms on the benzene ring, forming a chlorobenzene product.
This intermediate then undergoes rearrangement to form a new pi bond, resulting in the substitution of a chlorine atom for the hydrogen atom. This reaction is an important industrial process and is used to produce a variety of useful compounds, including herbicides, solvents, and plasticizers.
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explain why a catalyst increases the rate of reaction but does not change the value of the equilibrium constant for that reaction 1990
Adding a catalyst makes absolutely no difference to the position of equilibrium, and Le Châtelier's principle does not apply. This is because a catalyst speeds up the forward and back reaction to the same extent and adding a catalyst does not affect the relative rates of the two reactions, it cannot affect the position of equilibrium.
Is the dissolution reaction of ammonium nitrate enthalpy favored? a. No, it is not enthalpy favored since the chemical system loses energy. b. Yes, it is enthalpy favored since the chemical system loses energy. c. No, it is not enthalpy favored since the chemical system gains energy. d. Yes, it is enthalpy favored since the chemical system gains energy. e. No, it is not enthalpy favored since the chemical system neither gains nor loses energy.
c. No, it is not enthalpy favored since the chemical system gains energy.
What causes a spontaneous endothermic reaction when ammonium nitrate dissolves in water?If the temperature of the water lowers while ammonium nitrate dissolves in it, the process is endothermic and heat is absorbed by the system.
What happens when ammonium nitrate is dissolved?Through the process of dissociation into its individual ions, ammonium nitrate readily dissolves in water. Because it was created from a strong acid (HF) and a weak base (NH3), this salt has an acidic character (HNO3). This reaction is extremely exothermic and it happens quickly.
An explanation of spontaneous chemical reactions Was this response a spontaneous one, and if not, why not?A spontaneous reaction favors one that favors the creation of products in the environment in which it is taking place. A campfire that is roaring is an exothermic example of a spontaneous reaction.
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how many moles of air would be inside the box at the pressure calculated in part c? (at 1 atm a t m pressure, this box would contain 41.4 mol m o l of air.)
41.4 mol air would be inside the box at the pressure calculated in part c.
What is pressure calculation of air mol?
41.4 mol air would be inside the box at the pressure calculated in part c because the pressure of the air inside the box is 1 atm. Since the molar mass of air is 28.97 g/mol, the box would contain 41.4 mol of air at this pressure. The molar mass of air is the average molar mass of the components of air, which are nitrogen, oxygen, argon, carbon dioxide, and other trace gases. Therefore, the number of moles air inside the box at the pressure calculated in part c is equal to 41.4 mol.
Calculation of pressure of air inside box.
To calculate the pressure of air inside the box, ideal gas law equation is used which is: [tex]PV = nRT[/tex]
where P is the pressure, V is the volume of the box, n is the number of moles of air, R is the universal gas constant [tex](8.314 J/molK)[/tex], and T is the temperature of the box.
Therefore, the pressure of air inside the box can be calculated as follows:
[tex]P = (41.4 mol) (8.314 J/molK) / (V) (T)[/tex]
where V and T are the volume and temperature of the box, respectively.
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why is the reaction rate low at ph7? be specific and say something about the enzyme structure at the molecular level!
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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Can pouring cold water on a cold windshield crack it?
if 50 g of sugar were added to 100 g of water at 20 oc to form a solution, how would you describe the solution?
If 50g of sugar is added to 100g of water at 20° C to form a solution, this would form a saturated solution with 33.33% concentration of sugar in the solution.
When 50 g of sugar is dissolved in 100g of water, it would form a saturated solution with 150g of total mass. This can be verified as:
Mass of the solute (sugar) = 50g
Mass of the solvent = 100g
Mass of the solution = 50 + 100 = 150g
Now, the mass concentration of sugar could be found as:
Mass of the solute/ Mass of the solution × 100
= 50/150 × 100 = 33.33%.
A saturated solution is one in which, at a given temperature, the maximum quantity of solute has dissolved in the solvent. A solute's saturation point is influenced by its concentration. A solute's saturation point rises with increasing concentration. This is due to the fact that more particles are accessible to dissolve in the solvent with a greater solute concentration.
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What type of reaction combines a carbon-hydrogen compound with oxygen to form carbon dioxide and water?
Hydrogen combustion is a type of reaction that combines a carbon-hydrogen compound with oxygen to form carbon dioxide and water.
The process of a hydrocarbon reacting chemically with oxygen to produce carbon dioxide, water, and heat is known as hydrogen combustion. Molecules with both hydrogen and carbon make up hydrocarbons.
hydrogen combustion are most known for being the main component of coal, natural gas, and petroleum, which are all types of fossil fuels. In hydrogen combustion, liquid or gaseous hydrogen is burned to provide thrust in a modified gas turbine engine.
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in a melting point determination, what effect will using a large sample have on the melting point range?
Using a large sample in a melting point determination can cause the melting point range to be wider.
This is because it takes longer to melt more of a sample, and so the temperature range over which the melting occurs will be larger. Additionally, if the sample is not mixed properly, the melting point range can be even wider due to the presence of impurities.
This is because impurities can cause the sample to melt over a longer period of time, resulting in a wider melting point range. It is important to make sure that the sample is properly mixed before measuring the melting point range, as this can help to reduce the effects of impurities and ensure that the range is as accurate as possible.
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Fertilizers are classified as which kind of water pollutant?
Pilihan jawaban
a. organic chemicals
b. inorganic chemicals
c. heavy metals
d. physical agents
Inorganic chemicals, a class of water contaminants, include fertilisers.
What are fertilizers?In order to give plants the vital nutrients they require for healthy growth and development, fertilisers are compounds that are put to the soil. The three main macronutrients found in fertilisers are nitrogen (N), phosphorus (P), and potassium (K), as well as trace metals including iron, zinc, and magnesium.
Inorganic chemicals, a category of water contaminants, include fertilisers. Fertilizers include vital plant nutrients like nitrogen, phosphorus, and potassium, but if used excessively, they can have a severe effect on the water quality. The excess nutrients from fertiliser runoff can cause toxic algae blooms to proliferate and water bodies to become oxygen-depleted, which can have an impact on aquatic life and lower the quality of drinking water. Fertilizers and other inorganic compounds can also contribute to the rise in total dissolved solids (TDS) levels in water, which causes salinization and reduces the amount of available water.
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If you dissolve 0.3 moles of hbr in 1 l of water, what do you expect to be present in the beaker after the compounds have had time to react?
If you dissolve 0.3 moles of hydrogen bromide (HBr) in 1 liter of water, Ionization will happen which the HBr will dissociate into its ions, hydrogen (H+) and bromide (Br-). HBr (aq) ⇒ H (+) + Br (-).
Hydrogen bromide in the solution dissociate into in's constituent ions and this is an exothermic reaction. An exothermic reaction involves releasing of heat while progressing the reaction.
The heat that released from this exothermic reaction helps to increase the solubility of HBr in water.
The concentration of H+ ions will determine the pH of the solution. If the pH is 7 then it is neutral, if the pH is above 7 then it is alkaline and below 7 it is acidic.
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the smallest division on a 10 ml graduated cylinder is 0.1 ml. suppose a reading was exactly on the 10 ml mark, how should this readind be recorded ?
The smallest division on a 10 ml graduated cylinder is 0.1 ml. suppose a reading was exactly on the 10 ml mark, The reading should be recorded as 10.0 ml. Because the smallest division on a 10 ml graduated cylinder is 0.1 ml, and the reading was exactly on the 10 ml mark, the most precise and accurate way to record the reading is to include all the significant digits, which in this case would be 10.0 ml.
A graduated cylinder is a laboratory glassware used to measure the volume of liquids. It has a cylindrical shape with graduated markings on the side, allowing for precise measurement of the volume of a liquid. The liquid is usually added to the cylinder until it reaches the desired volume, which can be read from the markings on the side. Graduated cylinders come in different sizes and with different increments of markings, depending on the level of precision needed for a particular application.
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