Which row shows correct statements about the speed at which a gas diffuses?
effect of temperature
diffusion is faster at higher temperatures
diffusion is faster at lower temperatures
diffusion is faster at higher temperatures
diffusion is faster at lower temperatures
ABCD
А
В
с
effect of molecular mass
higher molecular mass diffuses faster
higher molecular mass diffuses faster
lower molecular mass diffuses faster
lower molecular mass diffuses faster
Answers
The speed of diffusion of gases is faster at a higher temperature and when the molecular mass of the gas is lower.
Transport that is done passively is called diffusion. Unless the concentration is uniform throughout a space, a single material goes from an area of high concentration to one of low concentration.
Because thermal energy is a function of temperature, molecules move randomly and continuously based on their mass, their surroundings, and their internal energy. This motion takes into consideration the diffusion of molecules across the medium in which they are situated. A material moves into any place that is open to it until it fills the entire area equally.
Molecules will continue to move about in a region after a material has entirely diffused across it, eliminating the gradient of concentration. However, there will not be any net molecule movement from one location to another. We refer to this absence of a gradient of concentration where there is no net movement of the material as dynamic equilibrium. Although diffusion will continue when a substance's concentration gradient is present, a number of things influence the diffusion rate:
(i) Molecular mass: Since heavier molecules travel more slowly, they diffuse more slowly as a result. For lighter molecules, diffusion occurs quicker.
(ii) Temperature: Higher temperatures boost energy, which in turn causes molecules to move more quickly and speed up the diffusion process. Lower temperatures reduce the energy of the molecules, which lowers the diffusion rate.
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Related Questions
In a titration, 25mL of 0.20M NaOH neutralize 5mL of HCI, what is the acid molarity?
Answers
The molarity of the HCl sample is 1.0 M.
In a titration, the moles of acid are equal to the moles of base at the equivalence point.
We can use this principle to calculate the molarity of the acid (HCl) from the volume and concentration of the base (NaOH) used in the titration.
First, we need to calculate the number of moles of NaOH used in the titration:
moles of NaOH = M x V = 0.20 M x 0.025 L = 0.005 mol
Since NaOH and HCl react in a 1:1 molar ratio, the number of moles of HCl present in the sample is also 0.005 mol.
Now we can calculate the molarity of HCl using the number of moles and the volume of the HCl sample used in the titration:
molarity of HCl = moles of HCl / volume of HCl sample
molarity of HCl = 0.005 mol / 0.005 L
molarity of HCl = 1.0 M
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Tyrone mixes some chemicals together. He notices that the mixture gives off heat and is hot to touch. What type of reaction is this?
A. Physical
B. Chemical
C. Polar Bear
D. Solution
Answers
Where v stands for __________________________________ and the units are meters per second (m/s).
Answers
Answer:
Velocity
Explanation:
Answer: velocity I’m sure
Explanation:
Do distilled water conduct electricity what will happen if we add sugar to it and then salted
Answers
Answer:
No, distilled water does not conduct electricity.If we were to add sugar then it will not conduct electricity, but if we were to add salt though it would conduct electricity.Explanation:
2. The air pressure inside a submarine is 0.56 atm. What would be the pressure in
mmHg?
Answers
If a vinyl chloride-vinyl acetate copolymer has a mole fraction ratio of 10:1 vinyl chloride to vinyl acetate mers and a molecular weight of 16,000 g/mol, what is its degree of polymerization
Answers
To calculate the degree of polymerization for a vinyl chloride-vinyl acetate copolymer with a mole fraction ratio of 10:1 and a molecular weight of 16,000 g/mol, you need to first find the molecular weight of the repeating unit.
The mole fraction ratio indicates that for every 10 vinyl chloride units, there is 1 vinyl acetate unit. The molecular weight of vinyl chloride (C2H3Cl) is 62.5 g/mol, and the molecular weight of vinyl acetate (C4H6O2) is 86.1 g/mol.
To find the molecular weight of the repeating unit, you can use this equation:
(10 * molecular weight of vinyl chloride) + (1 * molecular weight of vinyl acetate) / 11
Substitute the values:
(10 * 62.5) + (1 * 86.1) / 11 = (625 + 86.1) / 11 = 711.1 / 11 = 64.65 g/mol
Now, to find the degree of polymerization, divide the molecular weight of the copolymer by the molecular weight of the repeating unit:
Degree of polymerization = 16,000 g/mol / 64.65 g/mol ≈ 247.4
The degree of polymerization for this vinyl chloride-vinyl acetate copolymer is approximately 247.
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In the following molecules, the primary intermolecular attractive force is
Answers
Answer:
Dipole-dipole
Explanation:
A student places a 2.0 gram sample of magnesium metal in a bottle and fits the bottle with a two hole rubber stopper as shown in the diagram. Hydrochloric acid is added to the bottle and a
reaction occurs. As the reaction proceeds hydrogen gas travels through the tubing to an inverted
bottle filled with water, displacing some of the water in the bottle.
1. Calculate the number of grams of magnesium the students should mass out, to make 0.40 Liters of Hydrogrm gas at STP, show set up
Answers
The required number of grams of magnesium to make 0.40 Liters of Hydrogen gas at STP is 0.43 grams.
What is ideal gas equation?Ideal gas equation gives idea about the behavior of gas at different condition & represented as:
PV = nRT, where
P = standard pressure = 1atmV = volume = 0.4 Ln = moles = ?R = universal gas constant = 0.082 L.atm / K.molT = standard temperature = 273.15KOn putting values, we get moles as:
n = (1)(0.4) / (0.082)(273.15) = 0.0178 mol
Given chemical reaction is:
Mg + 2HCl → MgCl₂+ H₂
From the stoichiometry of the reaction:
0.0178 moles of H₂ = produced by the reaction 0.0178 moles of Mg
Mass of Mg = (0.0178mol)(24.3g/mol) = 0.43g
Hence required mass of magnesium is 0.43g.
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write down the importance of solution in our daily life in any 4 points
Answers
Explanation:
Four importances :
1. Solution of tea leaves, water and sugar is used to make tea
2. Solutions of the chemicals are used in labrotary
3. The drinks that we take are also a kind of solution
4. The air is also a solution of different gases
two males volunteer to donate 50ml of blood, one is 6’2" and weighs 250lbs, the other is 5’5" and weighs 140 lbs. assuming both are healthy, the hematocrit of the larger individual should be ________.
Answers
The hematocrit of the larger individual should be higher than that of the smaller individual.
Hematocrit refers to the percentage of a person's total blood volume that is comprised of red blood cells (RBCs). Hematocrit levels typically differ between males and females. Males have a higher hematocrit level than females.
Red blood cells (RBCs) are the most numerous cells in the blood. They are responsible for transporting oxygen from the lungs to the rest of the body. The hematocrit of the larger individual should be higher than that of the smaller individual. This is because the hematocrit level in the blood is typically higher in individuals who are larger and weigh more.
The reason for this is that larger individuals have a greater blood volume, and so their blood has a higher concentration of red blood cells (RBCs). RBCs contain hemoglobin, which is responsible for carrying oxygen to the body's tissues. Thus, individuals with a higher hematocrit level typically have a greater capacity to transport oxygen to their tissues.
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name two bases which react with dillute sulfuric acid to give zinc sulfate
Answers
Answer:
Zinc Carbonate
Zinc Nitrate
Explanation:
when the concentrations of both mercury chloride and oxalate ion are 0.30 m, what is the rate of the reaction?
Answers
The concentrations of both mercury chloride and oxalate ion are 0.30 m, the rate of the reaction is 7.8 × 10⁻⁴ M/s.
given that :
concentration of mercury chloride = 0.30 M
concentration of oxalate ion = 0.30 M
It can be written as:
2HgCl₂ + C₂O₄²⁻ -----> 2Cl⁻ + Hg₂Cl₂ + 2CO₂
k = 8.7 × 10⁻³ M⁻²/s⁻¹
The rate of the reaction will be shown as :
Rate = k [HgCl₂ ] [ C₂O₄²⁻ ]²
Rate = 8.7 × 10⁻³ (0.30)(0.30)²
Rate = 7.8 × 10⁻⁴ M/s
Thus, rate of the reaction will be :
Rate = 7.8 × 10⁻⁴ M/s
This question is incomplete , the complete question is :
__""when the concentrations of both mercury chloride and oxalate ion are 0.30 m, what is the rate of the reaction? "__
the rate is given as : Rate = k[HgCl₂ ] [ C₂O₄²⁻ ]² value of k = 8.7 × 10⁻³ M⁻²/s⁻¹__"
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is the pH of a strong acid higher or lower than the pH of a weak acid of the same concentration?
Answers
The pH of an acid solution is not solely determined by its concentration, but also by its strength. In other words, a weaker acid may have a higher pH than a stronger acid, even if they have the same concentration.
The pH of a strong acid is actually lower than the pH of a weak acid of the same concentration. This is because the strength of an acid is determined by its ability to donate hydrogen ions (H+) in a solution. Strong acids like hydrochloric acid (HCl) and sulfuric acid (H2SO4) have a high affinity for donating hydrogen ions, and they readily dissociate in water to produce a high concentration of H+ ions. As a result, the pH of a strong acid solution is very low, usually ranging between 0 to 2.
Weak acids like acetic acid (CH3COOH) and citric acid (C6H8O7) have a lower affinity for donating hydrogen ions, and they only partially dissociate in water to produce a smaller concentration of H+ ions. Consequently, the pH of a weak acid solution is higher than that of a strong acid solution of the same concentration, usually ranging between 3 to 6.
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An object in space (or moon) that orbits a planet or minor planet. *
Answers
Answer:
A minor-planet moon is an astronomical object that orbits a minor planet as its natural satellite.
Explanation:
An object in an orbit is called a satellite. A satellite can be natural, like Earth or the moon. Many planets have moons that orbit them. A satellite can also be man-made, like the International Space Station.
A chemist describes a particular experiment in this way: "0.0400 mol of H2O2 decomposed into 0.0400 mol of H2O and 0.0200 mol of O2." Express the chemistry of this reaction by a conventional equation.
Answers
If 12.52mol of aluminum metal is reacted with2.38mol of iron (III) oxide, how many particles, inmoles of iron metal are likely to form?Reaction: 2Al(s) + Fe₂O3(aq)--> Al2O3(aq) + 2Fe(s)
Answers
Answer
4.76 mol Fe
Procedure
Consider the following balanced equation and determine the limiting reagent using the coefficients method
2Al(s) + Fe₂O3(aq)--> Al2O3(aq) + 2Fe(s)
\(12.52\text{ mol Al}\frac{2\text{ mol Fe}}{2\text{ mol Al}}=12.52\text{ mol Fe}\)\(2.38\text{ mol Fe}_2\text{O}_3\frac{2\text{ mol Fe}}{1\text{ mol Fe}_2\text{O}_3}=4.76\text{ mol Fe}\)The lowest amount is the one produced by the iron (III) oxide therefore that is the limiting reagent and 4.76 mol of Fe is the max amount that can be produced of Iron.
which dot and cross diagram is incorrect?
Answers
The dot structure that can be shown to be incorrect is the dot structure that has been shown by option A
What is the dot structure?The Lewis structure is based on the concept that atoms tend to gain, lose, or share electrons in order to achieve a stable electron configuration similar to that of a noble gas. In the Lewis structure, the valence electrons of the atoms are represented as dots around the symbol of the atom.
We can see that in the dot structure that is in option A the both atoms are coming from the hydrogen atoms and shoud not be differently marked.
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In photosynthesis-
A. light energy is transformed into chemical energy
B. molecular energy is transformed into kinetic energy
C. chemical energy is transformed into light energy
D. light energy is transformed into heat energy
Answers
Answer:
A.
Explanation:
13. Given the table representing the subatomic particles
in four different atoms:
Atom
Number of Number of Number of
Protons Neutrons Electrons
A
4
4
4
E
5
7
5
G
6
7
6
J
12
12
12
Which atom has a mass of 12 u?
A) A
B) E
C) G
D) J
Answers
Answer: E
Explanation:
Why chemical industry important for the nation with its examples.
Answers
Explanation:
employment in the country.
economic boom n latest techonology.
less poverty.
more development.
more jobs for people.
increase in exports which will make large profits n will be utilized in the development of country.
GDP per capita will increase.
high standard of living.
calculate the volume of 0.200 m cacl2 needed to produce 2.00 g of caco. there is excess of na2co3
Answers
Answer:
x100.
Explanation:
Na2CO3 (aq) + CaCl2(aq) → CaCO3 (s) + 2 NaCl (aq)
For example, if we use 2.00 g CaCl2 x 1 mole = 0.0180 mole CaCl2
111 g CaCl2
and mix it with 2.00 g Na2CO3 x 1 mole = 0.0189 mole Na2CO3
106 g.
AB + CD → CB + AD, where A and C are cations and B and
D are anions
Answer:
x100 this is the answer I didn't do explanation sorry for that
Which of the following has mass?
A. Space
B. Light
C. Matter
Ο Ο
D. Force
Answers
Answer:
matter should be the answer
Explanation:
Hope this helps!
Answer:
matter because matter makes up everything in the world EVERYTHING like this computer ri am typing on? matter. what ever device you are using to view this? matter. everything is made of matter. matter is starting to sound weird now so I'm gonna stop saying it and this is the end of the answer remember THAT ANSWER IS MATTERR!!!!!
How do I learn a subject easier
Answers
Say out loud what you want to remember.
Take notes by hand, not on a computer.
Chunk your study sessions.
Test yourself. A lot.
Change the way you practice.
Exercise regularly.
Get more sleep.
Learn several subjects in succession.
calculate the percent yield if the theoretical yield is 50.0g of a product and the actual yield is 42.0g
Answers
Answer:
sorry
Explanation:.
Answer:
84%
Explanation:
a solution of rubbing alcohol is 78.1 %% (v/v) isopropanol in water. how many milliliters of isopropanol are in a 79.9 ml ml sample of the rubbing alcohol solution?
Answers
The volume of isopropanol in a 79.9 ml sample of the rubbing alcohol solution is 62.4 ml.
Percentage by volume, %(v/v), is a measure of concentration that indicates the volume of solute per 100 volume units of the solution. In other words, the volume percent of a component in the solution is defined as the ratio of the volume of the component to the volume of the solution, expressed as a percentage.
% (v/v) = (volume of solute / volume of solution) x 100
Substitute the given information into the equation.
% (v/v) = 78.1 %
volume of solution = 79.9 ml
78.1 % = (volume of solute / 79.9 ml) x 100
volume of solute / 79.9 ml = 0.781
volume of solute = 62.4019
volume of solute ≅ 62.4 ml
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A farmer wants to start growing sweetcorn on his farm. He has found out that sweetcorn grows best in soil with a pH value of approximately 7.5. Explain how he can use the knowledge of acids, alkalis, and neutralisation to find out the pH value of his soil to make sure he gets the best crop possible
Answers
Answer:
The process to use this knowledge is explained as below:
Explanation:
1. Farmer should use an indicator to check the pH value of the soil of the field of the farm.
2. If the field or the farm has alkali soil add acid to reduce the pH value.
3. If the soil of the farm is acidic for the crop add alkali to increase the pH value.
4. It will be a neutralization reaction and changes the pH value of the farm.
5. Weather/leeching into the surrounding soil/plant or animal waste will lead to a change in pH value over time.
6. The pH value will need to be regularly monitored and adjusted.
Which of the following conditions most favors the process of dissolution?
Answers
what will be the result of the reaction
(CH3COO)2+redP +Cl2
Answers
Answer:
(CH3COO)2 + redP + Cl2 → ClCH2COOH + HCl
Explanation:
This is an example of halogenation of carboxylic acids at alpha carbon atom. In this reaction, red phosphorus and chlorine are treated with carboxylic acids having alpha hydrogen atom followed by hydrolysis to form alpha chloro carboxylic acid.
What will happen to the carbon dioxide produced by the link reaction in an animal?.
Answers
Answer:
The link reaction links Hint to the Krebs Cycle. It converts pyruvic acid to Acetyl-CoA. Carbon dioxide is released as a waste product, and one Hint is produced.
Explanation:
A carbon atom is taken out of pyruvate during the link reaction, creating carbon dioxide. Pyruvate is converted into acetate along with the removal of hydrogen, which is then taken up by the coenzyme NAD to create reduced NAD.
What is pyruvate ?The conjugate base of pyruvic acid is pyruvate. It serves as a crucial intermediary in a number of biological processes. It is created at the conclusion of glycolysis and serves as a catalyst for a number of metabolic processes, including gluconeogenesis, fermentation, cellular respiration, fatty acid synthesis, etc.
During cellular respiration, glucose and oxygen combine to produce carbon dioxide, water, and energy. Animals breathe out most of their carbon dioxide, which is then discharged into the atmosphere. Plants can then use this carbon dioxide for photosynthesis.
Acetyl-coenzyme A, the link reaction's final byproduct, then moves into the Krebs Cycle. Through the oxidation of acetyl-coenzyme A, the Krebs Cycle generates energy.
Thus, pyruvate is changed into the two-carbon molecule known as acetate.
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what solute maintains the medullary interstitial fluid osmotic gradient?
Answers
The solute that maintains the medullary interstitial fluid osmotic gradient in the kidneys is urea. Urea is a waste product formed during the breakdown of proteins in the liver and is excreted through urine.
It plays a crucial role in the concentration of urine and the maintenance of water balance within the body. In the kidneys, the medullary interstitial fluid is important for the process of urine concentration.
The descending limb of the loop of Henle is permeable to water, allowing water to move out of the tubules and into the interstitial fluid. However, the ascending limb is impermeable to water but actively transports solutes such as sodium and chloride out of the tubules.
As sodium and chloride ions are transported out of the ascending limb, urea is left behind, increasing its concentration in the medullary interstitial fluid.
This high concentration of urea creates an osmotic gradient, which is essential for the reabsorption of water from the collecting ducts. The osmotic gradient allows water to move out of the collecting ducts and into the surrounding interstitial fluid, leading to concentrated urine.
In conclusion, urea is the solute that helps maintain the medullary interstitial fluid osmotic gradient in the kidneys. Its presence in high concentrations in the medullary interstitial fluid is crucial for the concentration of urine and the regulation of water balance within the body.
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