The mole fraction of 13.2g of CH₄ in the given problem when dissolved in 52.4g of C₂H₆O is 0.42.
Mole fraction of CH₄ in C₂H₆O can be calculated in three steps:
1. The masses of CH₄ and C₂H₆Oneed to be converted into moles:
The mass of CH₄= 16.04g/mol
Therefore, the moles of CH₄ present in 13.2g = 13.2/16.04 moles = 0.82 moles.
The mass of C₂H₆O = 46.07 g/mol
Therefore, the moles of C₂H₆O present in 52.4g = 52.4/46.07 = 1.14 moles.
2. The total number of moles of solutes need to be calculated next,
Moles of CH₄+ Moles of C₂H₆O = 0.82 + 1.14 moles = 1.96 moles.
3. The last step is to divide the moles of CH₄by the total moles of solute = 0.82/1.96 = 0.42 moles.
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g the half-life of a certain radioactive substance is 24 hours. there are 9 grams present initially. a. express the amount of substance remaining as a function of time t. b. when will there be 1 gram remaining?
a. The amount of substance remaining as a function of time t can be described by the exponential decay equation:
A(t) = A0 * 0.5^(t/T),
where A(t) is the amount of substance remaining at time t, A0 is the initial amount of substance (9 grams in this case), T is the half-life of the substance (24 hours), and 0.5^(t/T) represents the fraction of the initial amount remaining at time t.
So, the amount of substance remaining at time t can be expressed as:
A(t) = 9 * 0.5^(t/24)
b. To find when there will be 1 gram remaining, we can set A(t) = 1 and solve for t:
1 = 9 * 0.5^(t/24)
0.111 = 0.5^(t/24)
t/24 = log(0.111)/log(0.5)
t = 24 * log(0.111)/log(0.5)
Using a calculator, we can approximate t to be approximately 77.2 hours. So, after 77.2 hours, there will be 1 gram of the substance remaining.
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select the complete ionic equation for the reaction between hcl and naoh.
The answer is H+(aq) + Cl(aq) + Na+(aq) + OH(aq) H2O(l) + Cl(aq) + Na(aq) according to the question.
Is an action a response?Reaction a behavior, emotion, or action that is an direct outcome of another conduct: When I tell people who I am, I like seeing their emotions. The government to make tax rises have received an instant, broad, and negative response.
How do simple reactions work?Simple response time (SRT), which is the shortest amount of time required to process a stimuli, is a fundamental indicator of processing speed. Francis Galton was the first to quantify SRTs, and he found that young participants had visual SRT latencies of less than 190 ms.
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Explain how magnetic potential energy can be transformed into kinetic energy.
Answer:
When moving magnets together, the amount of potential energy is increasing and being stored in the magnetic field but when you let go the magnetic force causes the potential energy to convert into kinetic energy and move.Explanation:
PLS HELP WILL GIVE BRAINLIEST!!!!
Fe2O3 + 3 CO -> 2 Fe + 3 CO₂
a) What is the mole ratio of Fe to CO?
b) What is the mole ratio of CO₂ to Fe₂O3?
c) How many moles of Fe are produced from 1.8 moles of Fe₂O3?
d) How many moles of Fe₂O3 are needed to produce 7.14 mol CO₂?
e) How many moles of CO are needed to produce 0.315 mol Fe?
Mole is one of the International System of Units' seven foundation units (SI). Therefore, the mole ratio of Fe to CO in the reaction Fe[tex]_2[/tex]O[tex]_3[/tex]+ 3 CO [tex]\rightarrow[/tex] 2 Fe + 3 CO₂ is 2:3.
What is mole?A mole is merely a measuring unit. In reality, it is one of the International System of Units' seven foundation units (SI). When basically determines are insufficient, new units are created.
Chemical reactions frequently occur at levels that use grams would be inappropriate, but using actual figures of atoms/molecules/ions would also be misleading. As a result, scientists devised the moles to bridge the divide among extremely small and extremely huge numbers. The mole ratio of Fe to CO in the reaction Fe[tex]_2[/tex]O[tex]_3[/tex]+ 3 CO [tex]\rightarrow[/tex] 2 Fe + 3 CO₂ is 2:3.
Therefore, the mole ratio of Fe to CO in the reaction Fe[tex]_2[/tex]O[tex]_3[/tex]+ 3 CO [tex]\rightarrow[/tex] 2 Fe + 3 CO₂ is 2:3.
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Large tides, called spring tides, are experienced in the Earth's oceans when the Moon is in position
Responses
A A.A.
B B.B.
C A and C.A and C.
D B and D.
Large tides, called spring tides, are experienced in the Earth's oceans when the Moon is in position C A and C.
What are large tides?Large tides, also known as spring tides, are the highest and lowest tides experienced in the Earth's oceans. They occur when the gravitational forces of the Moon and Sun are aligned, either on the same side of the Earth or on opposite sides. This alignment results in a combined gravitational pull on the Earth's oceans, causing the tides to rise to their maximum height and then fall to their minimum height.
Spring tides occur twice a month, during the full moon and new moon phases, and they have a greater tidal range than the more common, intermediate tides known as neap tides. The height of the tides is affected by a number of factors, including the size and shape of the ocean basin, the depth of the water, and the coastlines and ocean currents.
It is important to note that the term "spring tide" has nothing to do with the season of spring, but rather is derived from the Old English word "springan," which means to "leap up."
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how many moles of magnesium hydroproaxide are requierd to produce 12 moles of water
We would need six moles of magnesium hydroxide in the reaction.
What is the equation of the reaction?We must note that the reaction that we want to deal with here is a neutralization reaction and the reaction would involve the combination of the hydrochloric acid and the magnesium hydroxide molecule.
The equation of the reaction is something like this;
2HCl + Mg(OH)2 ----> MgCl2 + 2H2O
We have from the balanced reaction equation;
1 mole of magnesium hydroxide would yeild 2 moles of water
x moles of magnesium hydroxide would yeild 12 moles of water
x = 1 * 12/2
= 6 moles
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A 1.0-cm -diameter pipe widens to 2.0 cm , then narrows to 0.5 cm . liquid flows through the first segment at a speed of 4.0m/s .
The speed of the liquid in the second segment can be calculated using the equation of continuity, which states that the product of the cross-sectional area and the velocity of a fluid must remain constant along its path.
Hence, the velocity in the second segment can be found by [tex]v2 =[/tex][tex]v1 * (A1/A2)[/tex], where A1 and A2 are the cross-sectional areas of the first and second segments, respectively. Substituting the values, we get [tex]v2 =[/tex] [tex]4.0 m/s * (pi * (0.01^2) / pi * (0.02^2)) = 4.0 m/s * (0.01/0.04) = 4.0 m/s * 0.25 = 1 m/s[/tex].The speed of the liquid in the third segment can be found using the same method, which yields[tex]v3 = 4.0 m/s * (pi * (0.02^2) / pi * (0.005^2)) = 4.0 m/s * (0.04/0.000025) = 4.0 m/s * 1600 = 6400 m/s.[/tex] The volume flow rate is given by the product of the cross-sectional area and the velocity of the fluid. Hence, the volume flow rate through the pipe can be found by [tex]Q = A * v[/tex], where A is the cross-sectional area and v is the velocity of the fluid. Substituting the values, we get [tex]Q = pi * (0.005^2) * 6400 m/s = 0.196 L/s.[/tex]
The complete question is:
A 1.0-cm-diameter pipe widens to 2.0 cm, then narrows to 0.5 cm. Liquid flows through the first segment at a speed of 4.0m/s. Q A:What is the speed in the second segment?m/s Q B:What is the speed in the third segment?m/s Q C:What is the volume flow rate through the pipeL/s?
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what are the partial pressures of nh3 and h2s at equilibrium, that is, what are the values of pnh3 and ph2s , respectively?
H2S has a pressure of 0.368 atm, while NH3 has a pressure of 0.325 atm.
According to the query, the equilibrium partial pressure of NH3 and H2S has the values PNH3 and PH2S. The air is separated in accordance with the numerical equilibrium of the partial pressures of ammonia and hydrogen sulphate. The sum will be as follows:
According to ammonium bisulfite, the NH4HS(s)⇄NH3(g)+H2S(g) reacts with NH3 to produce hydrogen sulphide and ammonia (g)
This reaction will occur at 25°C if K's p-value is 0.120. NH3 has a partial pressure of 0.325 atm, while H2S has a partial pressure of 0.368 atm.
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which of the following characteristics can be written only in space c? (5 points) group of answer choices formed between positively and negatively charged ions occurs due to the sharing of electrons between two non-metal atoms occurs in substances that are mostly solids at normal temperature and pressure formed between an atom with very high electronegativity and an atom with very low electronegativity
The correct option is C. occurs in substances that are mostly solids at normal temperature and pressure.
A covalent bond is a chemical bond that entails the sharing of electrons to form electron pairs between atoms. these electron pairs are known as shared pairs or bonding pairs. The strong stability of attractive and repulsive forces between atoms, after they share electrons, is referred to as covalent bonding.
A covalent bond consists of the mutual sharing of 1 or greater pairs of electrons between atoms. those electrons are concurrently attracted through the two atomic nuclei. Covalent bond paperwork is when the distinction among the electronegativities of atoms is simply too small for an electron switch to occur to shape ions. Covalent bonds involve the sharing of electron pairs between atoms. Electron pairs shared between atoms of identical or very comparable electronegativity represent a nonpolar covalent bond (e.g., H–H or C–H), while electrons shared among atoms of unequal electronegativity constitute a polar covalent bond (e.g., H–O).
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Complete Question:
Lonic Bond Covalent Bond A which of the following characteristics can be written only in space c? (5 points)
A). formed between positively and negatively charged ions.
B). occurs due to the sharing of electrons between two non-metal atoms.
C). occurs in substances that are mostly solids at normal temperature and pressure.
D). formed between an atom with very high electronegativity and an atom with very low electronegativity.
Answer:
The correct answer is B). occurs due to the sharing of electrons between two non-metal atoms.
Explanation:
OoOoO
"Covalent bonds occur when two nonmetal atoms share electrons to achieve a stable configuration of the noble gases."-FLVS 2023 lesson ;)
what volume of 0.150 m naoh solution is required to react completely with 50.0 ml of 0.200 m hcl solution? [write the chemical equation first.]
0.150 M NaOH solution is mixed thoroughly with 50.0 ml of 0.200 M HCl solution. Then the volume of solution required to react with HCl is 100 ml.
The dilution process is a process carried out by mixing a solvent that is larger than the substance being dissolved. In principle, dilution only adds solvent, so that the number of moles of solute before dilution is the same as the number of moles of solute after dilution.
Formula:
V₁ × M₁ = V₂ × M₂
Information:
M₁ = Molarity of the solution before dissolution/dilution
V₁ = Volume of solution before dissolution/dilution
M₂ = Molarity of the solution after dissolution/dilution
V₂ = Volume Molarity of the solution after dissolution/dilution
HCl(aq) + NaOH(aq) → NaCl(aq) + H₂O(aq)
In the given question
[NaOH] = 0.150 M
V HCl = 50.0 ml
[HCl] = 0.200 M
0.1 M NaOH = 0.1 N
Required NaOH solution:
V₁ × M₁ = V₂ × M₂
V₁ × 0.1 M = 50.0 mL × 0.2.00 M
V₁ × 0.1 M = 10.00 ml.M
V₁ = 10.00 ml.M/0.1 M
V₁ = 100 ml
So, the NaOH solution is 100 ml.
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Question: Consider The Temperatures, Masses, Average Velocities, And Average Kinetic Energy Of The Three Kinds Of Gas In The Mixture. What Do They Have In Common? What Are The Differences? Drag The Appropriate Items To Their Respective Bins. Reset Help Partial Pressure Temperature Average Kinetic Energy Molar Mass Electronegativity Atom Size Average Velocity Common
The common things in all gases are temperature, average kinetic energy, and average velocity. The different thing about gases is their masses.
What impact does temperature have on the typical kinetic energy of gas molecules?A gas's temperature directly relates to the average kinetic energy of its particles. The particles must travel more quickly as the gas warms since their mass is constant.
What connection exists between temperature and typical kinetic energy?The average kinetic energy of a substance's particles is directly inversely correlated with its temperature. As the temperature rises, the particles must move more quickly because their mass is constant.
What happens to a sample of matter's kinetic energy as it is transitioning from a solid to a liquid?When a substance transitions from a solid to a liquid to a gas state, attractive forces do not become weaker; rather, the particles' increased kinetic energy, which denotes a higher rate of motion, enables them to defeat the forces.
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the molar mass and density of acetic acid are 60.1 g/mol and 1.049 g/ml, respectively. what is the volume in ml of 3.2 mmol of acetic acid?
The volume of acetic acid with the molar mass and density of acetic acid are 60.1 g/mol and 1.049 g/ml = 5.729 L
The volume occupied by one mole of a chemical element or chemical compound at standard temperature and pressure (STP) is known as the molar volume (Vm). By dividing the mass density (ρ) by the molar mass (M), it can be computed. One mole of any gas has a defined volume when it is at a particular temperature and pressure.
The equation:
Vm = M/ρ
Where,
Vm = molar volume (L)
M = molar mass (g/mol)
ρ = density (g/ml)
Hence,
The volume of acetic acid:
Vm = (60.1 g/mol) / (1.049 g/ml)
= 5.729 L
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True or False simple diffusion of a molecule down its concentration gradient requires an input of energy to the system.
True. A molecule must be supplied energy in order to simply diffuse down the concentration gradient.
Describe diffusion using an example.The net migration of particles from a location of heavy proportion to a place of low concentration is alluded to as diffusion, which is a physical process. Diffusing substances might be solids, liquid, or gases. Similar to this, any of the three states of matter might likewise be present in the medium where diffusion actually occurs.
What are the many kinds of diffusion?Diffusion is a process that smoothes out substance quantities in a system or creates an optimum concentration distribution in a system in terms of the components' random motion. There are three types of diffusion: molecular, Brownian, and turbulence.
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ow Many Carbon Atoms Are In 2 Moles Of Pentane CH About 6 X 10 Carbon Atoms About 5 X 10"" Carbon Atoms
6 × 1024 atoms of carbon Approximately 6 x 10 carbon, and around 5 x 10"" carbons, are present in 2 mole of pentane CH.
What does atom mean?If it come to the name atom, we must travel back to 400 B.C. ancient Greece. The Greek word atoms, that meaning "uncuttable," was proposed by Democritus, a renowned philosopher. He went on to explain that all stuff may eventually be broken down into distinct, tiny particles or atoms.
Five carbon atoms make up one pentane molecule.
1 mole of molecule has 5×6.022×1023 carbon atom
2 mole of molecule has 2×5×6.022 ×1023 carbon atom
= 60.22 ×1023 =6.022 ×1024 carbon atom
So about 6 × 1024 carbon atom is correct answer
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how many rings do pyrimidines have in their structure?
Answer:
One, which just has six members and two nitrogen atoms.
a 3% solution of sulphuric acid was mixed with an 18% solution of sulphuric acid to produce an 8% solution. howe much 3% solution and how much !8% solution were used to produce 15 l of 8% solution
An 8% solution of sulfuric acid was created by combining a 3% solution and an 18% solution of the acid.
What occurs if 200 grammes of a 25% sulfuric acid solution are mixed with 300 grammes of a 40% sulfuric acid solution?In order to do that, 300g of 40% sulfuric acid solution and 200g of 25% sulfuric acid solution were combined. The amount of acid in the mixture must also be determined. This means that 34% of the mixture is acid, on average.
.18x+.03(15-x)=.08*15
.18x+.45-.03x=1.2
.15x=1.2-.45
.15x=.75
x=.75/.15
x=5 L of 18% solution is used.
15-5=10 L of 3% solution is used.
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The ions formed when MgI2 dissociates in water are
The ions formed when MgI2 dissociates in water are Mg2+ and I− ions. Due to their great water solubility, these salts are typical ionic halides.
What are MgI2's cation and anion?Iodine anion I2+ and magnesium cation Mg2+ interact structurally. It exists in anhydrous form with a hexagonal crystal structure, hexahydrate form with a monoclinic structure, and octahydrate form with an orthorhombic structure.
What forms a dissociation of MgI2?When magnesium iodide is dissolved in water, it totally dissociates to form magnesium cations and iodide anions in the aqueous solution.
Mg2+ contains how many ions?The Mg2+ ion contains 10 electrons. A magnesium atom that is neutral would have 12 electrons to counteract the positive charge of the atom's 12 protons. An ion must possess more protons than electrons in order to be positively charged.
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what is the enzyme-mediated hydrolysis process that breaks down large macronutrients into smaller molecules.
Chemical digestion is the process of breakdown of large macronutrients into smaller molecules by enzyme-mediated hydrolysis.
Chemical digestion is the process by which large macronutrients are broken down into smaller molecules via enzyme-mediated hydrolysis. The hydrolysis of the C-N bond digests proteins and polypeptides. About 20% of the proteins are digested by stomach pepsin, with the remainder digested by pancreatic and small intestine enzymes.
Enzymatic hydrolysis is a process in which hydrolase-type enzymes use a water molecule to cleave a substrate into reaction products. For optimal activity, the reaction conditions (temperature, pH, etc.) are specific to each enzyme.
Hydrolases are a type of enzyme that commonly acts as a biochemical catalyst by using water to break a chemical bond, resulting in the division of a larger molecule into smaller molecules.
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why is it necessary to balance chemical equations
It is necessary to balance chemical equations so as to ensure that law of conservation of mass is obeyed.
What is a chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
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nuclei above the belt of stability can lower their neutron-to-proton ration by undergoing what process? choose all correct answers; you may make more than one choice.
Nuclei above the belt of stability can lower their neutron-to-proton ratio by beta emission.
What is difference between beta emission, gamma emission and alpha emission?
Alpha emission: A new element Y (daughter nucleus) with a mass number equal to (A-4) and an atomic number equal to is created when the nucleus of a radioactive element X with mass number A and atomic number Z emits a particle (Z-2). Atomic number Z thus drops by two units and mass number drops by four units as a result of the emission of an alpha particle.
Beta emission: The number of nucleons in the nucleus (protons and neutrons) remains constant during beta emission, however the number of neutrons is reduced by one and the number of protons is increased by one.
Gamma emission: When a gamma particle is emitted, the atomic number Z and mass number A of the nucleus remain unchanged.
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Correct question:
Nuclei above the belt of stability can lower their neutron-to-proton ratio by_____
A) gamma emission.
B) positron emission.
C) beta emission.
D) electron capture.
E) Any of the above processes will lower the neutron-to-proton ratio.
when solute is added to a pure solvent what happens to the freezing point?
The consequence of adding one solution to a solvents affects a system provides freezing point throughout the reverse directions that it affects its boiling point.
What exactly is the freezing point?The final temperature is the specific temperature at which a liquids transforms into a solid. The melting temperature term refers to a changing argument, just like the annealing temperature term does.
What does water's freezing point mean?Due to the salty in ocean, it freezes at a lower temperature than fresh water—approximately 28.4 degrees Fahrenheit. Nonetheless, considering that only the watery part of freshwater freeze, very little salt is present in the ice when it is formed.
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Barium metal was quantitatively precipitated from a 1.52 g sample of BaCl_2_ 2H_2_o. The mass of the barium that was collected was 0.844g. Calculate the experimental mass percent of barium in the sample. And the theoretical mass percent of barium in BaCl_2_ 2H_2_O.
While the theoretically weight percent or barium in BaCl22H2O is 56.2%, the actual mass percentage for barium inside the sample is 55.5%.
Where does barium come from?The use of barium sulfate aids in the diagnosis or discovery of issues with the oesophagus, stomach, and intestines. It is a contrast material for radiography. To make the various bodily components clearly visible, contrast chemicals are employed. Only a doctor or someone working closely with a doctor should administer this medication.
Actual mass % of Ba is calculated as follows:
0.844/1.52 x 100% = 55.5%
Ba's theoretical mass percent is
= 137.33/244.26 times 100%, or
= 56.2%, of the molar mass of Ba in comparison to the molar mass of BaCl2.2H2O.
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a physical chemist measures the width of a molecule. the width is . what is the width in meters? write your answer in scientific notation.
The width of the molecule in scientific notation can be expressed as equal to 66 × [tex]10^{-9}[/tex] meters.
A physical chemist measures the width of a molecule = 66 nanometers.
1 nanometer = 0.000000001 meter.
This can be expressed under scientific notation as:
1nm = [tex]\frac{1}{100000000}[/tex] meters = [tex]10^{-9}[/tex]
Therefore, 66nm can be expressed in scientific notation as 66 ×[tex]10^{-9}[/tex] meters.
Using scientific notation, one can describe a given quantity as a number with the requisite number of significant digits for a specific level of accuracy, multiplied by 10 to the appropriate power, for example, 1.56 × [tex]10^{7}[/tex]. It is a way to convey extremely large or extremely small numbers in a more straightforward manner.
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Complete question is:
A physical chemist measures the width of a molecule. the width is 66nm. what is the width in meters? write your answer in scientific notation.
write a balanced chemical equation for epsom salt being hjeated to produce magnesium sulfate solid and water vapor
The balanced chemical equation for epsom salt being heated to produce magnesium sulfate solid and water vapor is:
[tex]MgSO4*7H2O (s) -- > MgSO4 (s) + 7H2O (g)[/tex]
Magnesium sulphate heptahydrate, often known as epsomite, is a mineral with the chemical formula MgSO47H2O. Anhydrous salt plus water vapor plus hydrated salt. The molar ratio of salt to water can be calculated since many hydrates contain water in a stoichiometric amount. Magnesium sulphate heptahydrate crystals lose seven water molecules when they are gently heated, turning them into anhydrous magnesium sulphate. A single replacement occurs in this reaction. This is a single-replacement reaction because the general formula is met. The crystals of magnesium sulphate heptahydrate are typically needle-like and white, crystalline, or dazzling. It is easily soluble in water, more easily soluble in boiling water, and almost insoluble in alcohol.
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in the arrhenius equation, the collision frequency and molecular orientation are incorporated in the value of
a. T
b. R
c. Eact
d. A
The amount of A within the Arrhenius equation takes into account that both collision frequency as well as molecule orientation.
Explaining the Arrhenius equation:For this many chemical and biological reactions, the relationship between event speed and temperature is described by the Arrhenius equation. Such expression can be written as [9]: (6.10), while k is the rate of kinetic reaction, k0 is the equilibrium concentration, E is the angular frequency, R is the universal recurring theme, and the absolute temperature is T.
The Arrhenius equation: Where is it Used?To predict how a shift in the temperature would affect the rate constant and, in turn, total rate of the reaction, utilize the Arrhenius equation. The rate of the reaction is determined using the Formula. It is an important component of chemical kinetics.
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which postulate(s) of dalton's atomic theory of matter is/are not true? i. atoms of a given element are identical ii. atoms are indestructible iii. atoms combine in simple ratios to form compounds
Atoms of an unmarried element can have special loads' which isn't always found in postulates of Dalton's atomic theory.
i). Atoms of a given element are identical in length, mass, and other homes. Atoms of various factors range in size, mass, and other houses.
ii). Atoms are indivisible and indestructible. All atoms of a given detail are the same in mass and home.
iii). Atoms combine inside the ratio of small complete numbers to form compounds. The relative variety and types of atoms are steady in a given compound.
Dalton’s atomic idea was a systematic principle on the nature of count numbers put forward by the English physicist and chemist John Dalton in the year 1808. It said that everyone is counted changed into made of small, indivisible debris known as ‘atoms’.
All materials, in step with Dalton’s atomic idea, are made of atoms, which can be indivisible and indestructible constructing devices. even as a detail’s atoms were all equal in size and mass, numerous factors possessed atoms of various sizes and masses. Atoms of different factors can combine with every other in fixed complete-number ratios that allow you to form compounds. All atoms of a selected element are equal in mass, size, and different houses. but, atoms of various elements showcase extraordinary homes and vary in mass and length.
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if 4.0 ml of 0.20 m nacl is diluted by addition of 1.0 ml water, calculate the m concentration of the new solution.
Answer:
0.8 m of nacl
Explanation:
Using the dilution formula m1 v1 = m2 v2 and substation we get .20(4)=m2(1) and after solving for m2 via algebra we get .08 m of nacl
atoms of the same element with varying number of neutrons.
The same element's atoms called isotopes have variable quantities of neutrons, but identical numbers of protons and electrons.
An atom is what?The tiniest piece of something that cannot be destroyed chemically. The center of every atom is called the nucleus, and it is made up of protons and neutrons (particles with no charge). The nucleus is filled with electrons, which are negative particles.
Neutrons are what?Every atom's nucleus contains protons and neutrons, which are subatomic particles. The lone exception is hydrogen, which has a single proton in its nucleus. Neutrons are somewhat heavier than positively charged protons and have an electric charge that is neither positive nor negative.
Is the number of electrons in an isotope always the same?We are informed that because these isotopes are neutral atoms, they will all have an identical number of protons and electrons. The same number of protons exist in all isotopes of the same element, so it stands to reason that there will also be an equal number of electrons in each of these isotopes.
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calculate the amount of water in grams that must be added to 28.2 g of mgcl2 in the preparation of a 1.5% by mass solution.
In order to prepare a 1.5 percent by mass solution, 28.2 g of magnesium chloride requires 1851.8 g of water.
1.5 % by mass, means 1.5 g of solute in 100 g of solution.
So, 98.5 g of water was added to prepare 1.5 % solution.
28.2 g of Magnesium Chloride will use
28.2 × 98.5 ÷ 1.5 = 1851.8 g
Magnesium chloride:
Low levels of magnesium in the blood can be prevented and treated with the use of this medicine, a mineral supplement. Some brands are also used to treat symptoms of excess stomach acid, including indigestion, heartburn, and stomach upset.
Men, women, children, and pregnant women can all use magnesium chloride without any ill effects.
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alkenes are versatile synthetic precursors, because the pi bond of an alkene can generally function as either a or a :
Alkenes are versatile synthetic precursors, because the pi bond of an alkene can generally function as either a strong base or a weak acid
Alkenes are hydrocarbons that have a carbon-carbon double bond.Olefin is commonly equated with alkene, which is any hydrocarbon having one or more double bonds.Internal and terminal monoalkenes are the two primary subcategories. Terminal alkenes, sometimes referred to as -olefins, are preferable[Reference required]However, the International Union of Pure and Applied Chemistry (IUPAC) suggests using the name "olefin" for the general class - cyclic or acyclic, with one or more double bonds - instead of "alkene" for acyclic hydrocarbons with just one double bond, alkadiene, alkatriene, etc., or polyene for acyclic hydrocarbons with two or more double bonds, cycloalkene, cycloalka.
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complete question:
Alkenes are versatile synthetic precursors, because the pi bond of an alkene can generally function as either a ____ or a ____:
a.Lewis acid; Lewis base
b.weak base; strong acid
c.strong base; weak acid
d.weak base; weak neucleophile