Answer: Convection
Explanation: When you add hot water to a cold water, the cold water warms up because of convection. Convection refers to the invasion of warmer or hotter water to the cold water. The process relates to the situation where the cooler water sinks and the warmer water rises.
Answer:
b. convection
Explanation:
Suppose naoh standardization of khp determined that a volume of 25. 00 ml naoh has a concentration of 0. 049 m. Suppose 22. 20 ml of khp was used to get to the endpoint in this standardization. What is the mass of khp dissolved in 50. 00 ml of the standardization khp titrant?.
Standardization titrant was made by dissolving 0.5634 g of potassium hydrogen phthalate (KHP) in 50.00 mL of water.
1 mol of KHP will react with 1 mol of NaOH to form 1 mol of mixed salt and 1 mol of water. Based on this molar ratio, the number of moles of NaOH will be equal to the number of moles of KHP in the standardization titrant.
c = n/V, so n = c * V = 0.049 M * 0.025 L = 0.001225 mol of NaOH and KHP
This result can help us calculate the amount of KHP present in the whole 50.00 mL of the titrant:
22.20 mL : 0.001225 mol = 50.00 mL : X
X = 0.001225 mol * 50.00 mL / 22.20 mL = 0.002759 mol
Following that, we can use the KHP molar mass (204.22 g/mol), to get to the mass of it (in grams) dissolved in the sample:
n = m/M, so m = n * M = 0.002759 mol * 204.22 g/mol = 0.5634 g
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Circle or underline the correct answer
3- True or false: it is OK to leave your bags in the aisle
4- True or false: horseplay is fine before or after the lab 5- True or false: you do not need goggles or gloves for lab
6- True or false: you do not need to wash your hands after lab
7- True or false: it is OK to eat and drink in a lab class
8- True or false: it is OK to pour chemicals back into the bottle it came from
9-True or false: microscopes can be handled with one hand only
10-True or false: you do not need to read the instructions before lab
11-True or false: respect safety rules and guidelines
Answer:
3- True or false: it is OK to leave your bags in the aisle
4- True or false: horseplay is fine before or after the lab
5- True or false: you do not need goggles or gloves for lab
6- True or false: you do not need to wash your hands after lab
7- True or false: it is OK to eat and drink in a lab class
8- True or false: it is OK to pour chemicals back into the bottle it came from
9-True or false: microscopes can be handled with one hand only
10-True or false: you do not need to read the instructions before lab
11-True or false: respect safety rules and guidelines
Explanation:
I bolded the ones that it's supposed to be. You're teacher gave you a lot of false's though
How are particles in a solid like people sitting in a movie theater?
One gram of sodium chloride will take longer to dissolve in a solution of 2 m glucose than in a solution of pure water. What is the most reasonable explanation for this observation?.
One gram of sodium chloride takes longer to dissolve in a solution of 2M glucose than in pure water. This is because sodium chloride will encounter a greater frequency of collisions in a 2M glucose solution than in water. This shows that diffusion occurs more slowly in a solution containing a solute than in pure water.
If you were to put one gram of sodium chloride in a beaker of pure water, it would eventually dissolve. However, if you were to put the same amount of sodium chloride in a beaker of water that also contained two moles of glucose, it would take longer for the sodium chloride to completely dissolve.
The reason for this is that, in a solution with more molecules present, the sodium chloride would encounter more collisions. This would lead to a slower diffusion rate, and thus, a longer time for the sodium chloride to completely dissolve.
In general, solutions with more molecules present will have a slower diffusion rate than solutions with fewer molecules present. So, if you want the sodium chloride to dissolve quickly, it's best to put it in a pure water solution.
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During a class activity, students used colored candies to create models of elements, compounds, homogeneous mixtures, and heterogeneous mixtures. The students were then asked to use the models to compare and contrast mixtures and pure substances.
Which THREE observations could the students have made?
Responses
A.The dishes of candies representing compounds and homogeneous mixtures have the same ratio of different colored candies, so compounds and homogeneous mixtures are similar because they have the same ratio of their component substances.
The dishes of candies representing compounds and homogeneous mixtures have the same ratio of different colored candies, so compounds and homogeneous mixtures are similar because they have the same ratio of their component substances.
B.The candies in the dish representing elements are all one color and the candies in the dish representing the heterogeneous mixture are four different colors, so elements have only one part while heterogeneous mixtures have four different parts.
The candies in the dish representing elements are all one color and the candies in the dish representing the heterogeneous mixture are four different colors, so elements have only one part while heterogeneous mixtures have four different parts.
C.The dishes of candies representing elements, compounds, and homogeneous mixtures look the same no matter which part of the dish you are looking at, so pure substances are similar to homogeneous mixtures because they both look the same throughout.
The dishes of candies representing elements, compounds, and homogeneous mixtures look the same no matter which part of the dish you are looking at, so pure substances are similar to homogeneous mixtures because they both look the same throughout.
D.The candies in the dishes representing elements and compounds look the same, but the candies in the dish representing heterogeneous mixtures do not look the same, so pure substances are different than heterogeneous mixtures because pure substances look the same and heterogeneous mixtures don’t.
The candies in the dishes representing elements and compounds look the same, but the candies in the dish representing heterogeneous mixtures do not look the same, so pure substances are different than heterogeneous mixtures because pure substances look the same and heterogeneous mixtures don’t.
E.The candies in the dish representing compounds are stuck together and can’t be separated and the candies in the dishes representing the homogeneous and heterogeneous mixtures are not stuck together and can easily be separated, so compounds are different from mixtures because the parts of the compound cannot be separated.
The observation that could be made by the students are; B, D, E
What is a mixture?A mixture is composed of two or more substances that do not chemically react together. Elements are chemical substances that have independent existence. Elements are combined together to give compounds.
The three observations that the students could make are;
The candies in the dish representing elements are all one color and the candies in the dish representing the heterogeneous mixture are four different colors, so elements have only one part while heterogeneous mixtures have four different parts.The candies in the dishes representing elements and compounds look the same, but the candies in the dish representing heterogeneous mixtures do not look the same, so pure substances are different than heterogeneous mixtures because pure substances look the same and heterogeneous mixtures don’t. The candies in the dish representing compounds are stuck together and can’t be separated and the candies in the dishes representing the homogeneous and heterogeneous mixtures are not stuck together and can easily be separated, so compounds are different from mixtures because the parts of the compound cannot be separated.Learn more about about mixtures:https://brainly.com/question/24898889
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How many significant figures are in the measurement 0.03802 mL?
Answer:
5
Explanation:
3 6 5 7 0
Nitrogen has two isotopes, N-14 and N-15, with masses of 14.0031 amu and 15.001 amu respectively. If the atomic mass of nitrogen is 14.00674 amu, what is the abundance of each isotope?
(If there is any work pls include that in the answer so I get credit ;-;)
The percentage abundance of Mass of N-14 is 99.6 % while the percentage abundance of N-15 is 0.4%.
What is the abundance of each isotope?We know that an element is composed of several isotopes. The isotopes of an element has the same atomic number but different mass numbers. The reason for the difference in the mass number of the elements is the fact that the elements do not have the same number of neutrons.
Now we have the following information;
Mass of N-14 = 14.0031 amu
Mass of N-15 = 15.001 amu
Atomic mass of nitrogen = 14.00674 amu
Let the percentage abundance of Mass of N-14 be x and the percentage abundance of N-15 be 1 - x
We now have;
14.00674 = 14.0031x + 15.001(1 - x)
14.00674 = 14.0031x + 15.001 - 15.001x
14.00674 - 15.001 = 14.0031x - 15.001x
-0.9943 = -0.9979x
x = 0.996
Hence;
percentage abundance of Mass of N-14 =0.996 or 99.6 %
percentage abundance of N-15 = 1 - 0.996 = 0.004 or 0.4%
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Challenge What mass of methane (CH4) must be burned in order to liberate 12,880 kJ
of heat? Refer to Table 3.
HW
The mass of methane (CH₄) which must be burned in order to liberate 12,880 kJ of heat is 231.9 g
A combustion reaction is a reaction in which a substance reacts with the oxygen and releases the energy in the form of light and heat.
Given data :
Heat energy liberated = 12,800 kJ
Δ Combustion = 891 kJ/mol
To calculate the mass of methane (CH₄) -
Number of moles of methane burned = Heat energy used
Δ Combustion
Number of moles of methane burned = 12880
891
Number of moles of methane burned = 14.455 mol
Since, Molar mass of methane is 16.043 g/mol
So, Mass of methane = Number of moles of x Molar mass of methane
methane burned
Mass of methane = 14.455 mol x 16.043 g/mol
Mass of methane = 231.9 g
Therefore, the mass of methane which must be burned is 231.9 g.
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Which chemical group is most likely to be responsible for an organic molecule behaving as a base?.
The chemical group which is most likely to be responsible for an organic molecule behaving as a base is Amino group.
Amines are the nitrogen containing organic bases.
Simple organic molecules such as methylamine, H₃N-CH₃, and ethylamine, H₃N-CH₂CH₃ are known as the bronsted bases.
Functional group is defined as a group of atoms in molecule having different chemical properties and provides some characteristics to the molecule. The functional group is attached to the carbon atom in a molecule.
Functional groups can behave as a base or an acid depending on the ability of the structure to accept or to donate the H⁺ ions.
Amino group is represented as :
R
\NH₂
. .
Amino group is having the ability to accept the H⁺ ions, and it forms NH₃⁺.
--NH₂ + H⁺ → NH₃⁺
So, Amino group is most likely to be responsible for an organic molecule behaving as a base.
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help me nobody seems to know the answer to this
B. The MOST plausible prediction and explanation of the ending mass is 3g of (AgCl + NaBr); matter is conserved so the total mass will be the same in the beginning and end.
What is the law of conservation of matter?
The law of conservation of matter states that mass cannot be created nor destroyed, but can be converted from one form to another.
When the law of conservation of matter or mass is applied in a chemical reaction we will observe the following;
the mass of the reactants and mass of products are conservedthe total mass of the reactants is equal to the total mass of the producteach component of the reaction is conservedno new element is createdFrom the given chemical reaction;
2 g of NaCl + 1 g of AgBr = ?AgCl + ? NaBr
Based on the law of conservation of matter, the total mass of the reactants (3 g) must be equal to the total mass of the product (3 g) because matter is conserved.
Thus, the MOST plausible prediction and explanation of the ending mass is 3g of (AgCl + NaBr); matter is conserved so the total mass will be the same in the beginning and end.
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Into what protein structure is spider silk found?
A. primary
B. secondary
C. tertiary
D. quaternary
Answer:
Into what protein structure is spider silk found?
= Primary structure
I HOPE IT HELP YOU
A gas mixture being used to simulate the atmosphere of another planet at 23°c consists of 337 mg of methane, 148 mg of argon, and 210 mg of nitrogen. The partial pressure of nitrogen at 296 k is 19. 0 kpa. Calculate the total pressure of the mixture.
The total pressure of the mixture is 81.57 kPa
Why is it possible to calculate the total pressure of a mixture?Each rapidly moving gas particle in a mixture has an equal chance of colliding with the container walls. As a result, each gas exerts its own pressure independent of the other gases present. The total pressure is the sum of all collisions per unit of wall area over a given time period.1. Write down all units given.
T= 296.15 k
337 mg CH4
148 mg Ar
210 mg of N2
PPN2= 19 kPa
2. Convert mg to g.
337 mg= 0.337 g CH4
148 mg= 0.148 g Ar
210 mg= 0.210 g N2
3. Calculate moles for each.
0.337/16.04= 0.021 mol CH4
0.148/39.948= 0.003 mol Ar
0.210/28.02= 0.007 mol N2
4. Calculate the mole fraction of N2. Xi= nN2/n total
0.007/0.021 + 0.003 + 0.007= 0.225
5. Remember that PPN2= xN2 x Total Pressure
19 kPA= 0.225x
6. Solve for x.
19/0.007=84.45 kPA
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An element with 20 protons and 20 elec-
trons gains one electron. The electron goes
into what type of orbital?
An element with 20 protons and 20 electrons gains one electron. This gained electron goes into the 3d-orbital.
What are electrons?Electrons may be defined as the type of sub-atomic particles which are consistently revolving around the nucleus of an atom. These particles are negatively charged in nature. It may be thought that J.J. Thomson discovered the electrons for the very first time.
The electronic configuration of an element that possesses 20 electrons is [tex]1s^2 2s^22p^63s^23p^64s^2[/tex]. So, the 4s orbital is completely filled. Now, the gained electron must enter the 3d orbital in order to systematize the electronic configuration. The electrons will fill up the five 3d orbitals and finally the three 4p orbitals to complete energy level 4.
Therefore, an element with 20 protons and 20 electrons gains one electron. This gained electron goes into the 3d-orbital.
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With this information, we now need to calculate the volume in milliliters. We need to know how many mls a drop of oleic acid occupies using the density of 0. 895 g/ml and the number of drops of oleic acid solution used.
According to the density, there are m/0.895 milliliters in a drop of oleic acid and the total drop is 0.895/m of total volumes.
We need to know about the density to solve this problem. Density is a unit that measures how dense an object is. Density can be measured by dividing mass by volume. It can be written as
ρ = m / V
where ρ is density, m is mass and V is volume
From the question above, we know that
ρ = 0.895 g/mL
Assume that 1 drop of oleic acid is m gram. Hence,
ρ = m / Vdrop
0.895 = m / Vdrop
Vdrop = m/0.895 mL
Find the total drops
V = Vdrop x n
n = V / Vdrop
n = V / (m/0.895)
n = 0.895/m of total volumes
in a drop, there is m/0.895 mililiters of oleic acid and the total drop is 0.895/m of total volumes.
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help! 10 points! will give brainlist!
Water molecules can react with each other according to the equation below:
2H2O ⇌ H₃O⁺ + OH⁻
If H₃O⁺ is added to 2H2O ⇌ H₃O⁺ + OH⁻ , the equilibrium will shift right to the product.
If H₃O⁺ is taken away from 2H2O ⇌ H₃O⁺ + OH⁻, the equilibrium will shift left to the product. If OH⁻ is added to 2H2O ⇌ H₃O⁺ + OH⁻ the equilibrium will shift left to the reactants If OH⁻ is taken away from 2H2O ⇌ H₃O⁺ + OH⁻, the equilibrium will shift right to the reactantWhat is equilibrium?Equilibrium can be defined as the state in which both reactants and products are present in concentrations and they have no chances to change with time. It is also the state of a reaction in which the rates of the forward and reverse reactions are the same. This means there is no observable change in the properties of the system.
So therefore, water molecules can react with each other according to the equation below:
2H2O ⇌ H₃O⁺ + OH⁻
If H₃O⁺ is added to 2H2O ⇌ H₃O⁺ + OH⁻ , the equilibrium will shift right to the product
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the reaction a 2b → c is found to be first order with respect to both a and b. when the concentration of a is 0.200 m and the concentration of b is 0.400 m, the reaction rate is 0.00700 m/s. what is the numerical value of k
Option E) In the reaction A+ 2B-C that is found to be first order with respect to both a (0.200 m concentration and b (0.400 m concentration) the numeric value of k is 0.0875
What is Concentration?Concentration in chemistry terms is calculated by dividing a constituent's abundance by the mixture's present total volume.
Mass concentration, molar concentration, number concentration, and volume concentration are four different categories that can be described in a mathematical description.
A + 2B → C
Rate = K [A] [B]
Here,
[A] = 0.2 M [B]
⇒ [A] = 0.4 M
rate = 0.007 M/s
Therefore, rate = K [A] [B]
⇒ 0.007 = K (0.2) (0.4)
⇒ K = 0.0875 M^(-1) S^(-1)
Thus, option E is correct.
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Complete question
The reaction A+ 2B-C is found to be first order with respect to both A and B. When the concentration of A is 0.200 M and the concentration of B is 0.400 M, the reaction rate is 0.00700 M/s. What is the numerical value of k for this reaction (with appropriate units where time is in seconds and concentration is in M, as needed).
A) 0.0438
B) 0.0140
C) 11.4
D) 5.60 x 10^(-4)
E) 0.0875
How much energy is needed to raise the temperature of 5.0 grams of lead from 25°C to 35°C? [specific heat (c) = 0.129 J/(g•°C)]
Q=C x M x ^ T
The amount of energy that is needed to raise the temperature of 5.0 grams of lead from 25°C to 35°C is 6.45J.
How to calculate energy?The energy of a substance can be calculated by using the following formula:
Q = mc∆T
Where;
Q = quantity of heat absorbed or releasedm = mass of substancec = specific heat capacity∆T = change in temperature (°C)According to this question, 5.0 grams of lead needs to be raised from 25°C to 35°C, the amount of energy needed can be calculated as follows:
Q = 5 × 0.129 × {35°C - 25°C}
Q = 6.45J
Therefore, the amount of energy that is needed to raise the temperature of 5.0 grams of lead from 25°C to 35°C is 6.45J.
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please help will give brainlist!!! POINTS: 30
Answer:
Test the water with an actual test or put something that would react to acid in water to test it.
Explanation:
test the water for acidic contents
Claim- the water is acidic
Evidence- the test said it had an acidic composition
conclusion- the water is acidic
Which sentence describes an item that would help this geologist make better observations about the rocks while in the field?
Answer:
Magnifying glass or a special device that resembles a handheld microscope, used to observe ink placement of printers
Explanation:
which is more reactive hydrogen or Oganesson based on Electron affinity
The negatively charged atoms are known to show the electron affinity. Hydrogen is more reactive than oganesson based on electron affinity.
What is electron affinity ?The amount of energy released when an electron is added to a neutral atom to create a negatively charged ion is known as electron affinity in chemistry.
Due to the difficulty in determining atoms' electron affinities, values are only known for a small number of chemical elements, primarily halogens.
Similar towards how chlorine can achieve the configuration of noble gases and become an electronegative ion, hydrogen has a high attraction for electrons, becoming the hydrogen anion and obtaining the stable configuration of helium.
The first synthetic element to belong to group 18 (the noble gases), oganesson has the potential to be substantially more reactive than the other members of that group.
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Solution a is hypotonic with respect to solution b. What will happen when a cell from solution b is placed in solution a?.
When a cell is placed in a hypotonic solution (Solution A) water enters the cell toward the area of higher solute concentration. Hence, the cell gains water and swells up which increases the internal pressure.
A hypotonic solution is one in which the concentration of solutes is higher within the cell than outside it, whereas a hypertonic solution is one in which the concentration of solutes is higher outside the cell than inside it.
As a result, when a cell is initially placed in Solution B, which is hypertonic compared to Solution A, water will leak out of the cell and the cell will shrink.
Next, this cell will be moved to Solution A, which is hypotonic relative to Solution B, and at this point, the concentration of solute inside the cell is larger than that outside of it, resulting in less solute and more water in the solution. Due to the increased water content outside the cell, there is a net migration of water from the outside into the cell. Therefore, the cell absorbs water and swells up, resulting in a rise in internal pressure.
Note: Water/solvent always goes from a higher concentration to a lower concentration.
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How many protons, neutrons, and electrons are there?
Answer:
60 electrons and 62 protons
Explanation:
62 is the
mass number and proton number its plus 2 charge so it has to be 60 electrons
A plot of the maxwell distribution of speeds for the same sample of gas at different temperatures shows that.
The same sample of gas at different temperatures shows that at low
temperatures, most molecules have speeds close to their average
speed.
What does the Maxwell-Boltzmann distribution graph show?
Put simply, a Maxwell-Boltzmann distribution graph shows how the energy of gas particles varies within a system.
This is solely a measurement of the speeds of particles because kinetic energy is directly related to speed.
The Maxwell-Boltzmann distribution in chemistry is the subject of this article.
We will begin by describing how to read a graph of the Maxwell-Boltzmann distribution. This will involve taking a closer look at things like the typical energy and the most likely energy.
The graph will then be changed under various circumstances, such as when a catalyst is added or the temperature is raised.
The Maxwell-Boltzmann distribution, which we previously mentioned, is a probability function that depicts the distribution of energy among the particles of an ideal gas. (For more information on this topic, see Chemical Kinetics.)
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A plot of the maxwell distribution of speeds for the same sample of gas at different temperatures shows that at low temperatures, most molecules have speeds close to their average speed.
What is the maxwell distribution of speed?The distribution of energy between identical but distinct particles is the subject of the Maxwell-Boltzmann distribution.
The distribution of speeds for gas at a specific temperature is specified by the Maxwell-Boltzmann equation, which is the foundation of the kinetic theory of gases.
The speed that is most likely to occur, the speed that is average, and the root-mean-square speed can all be calculated using this distribution function.
The number of molecules moving at a given speed is represented by the Maxwell-Boltzmann graph's y-axis.
Therefore, if the graph is higher in a certain area, it indicates that there are more gas molecules traveling at such speeds in that area.
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red gold is a gold‑copper alloy used to make jewelry. a piece of jewelry made of red gold weighs 9.67 g and has a volume of 0.620 cm3 . gold has a density of 19.3 g/cm3 and copper has a density of 8.96 g/cm3 . calculate the percentage by mass of each metal in the jewelry. assume the total volume of the jewelry is the sum of the volumes of the two metals it contains.
Red gold weighs 9.67 g and has a volume of 0.620 cm3 . gold has a density of 19.3 g/cm3 and copper has a density of 8.96 g/cm3 percentage by mass of each metal in the jewelry is 94,4732031% of gold and 5,5267969% of copper
Here given data is
Red gold weighs = 9.67 g and volume of gold = 0.620 cm3 and density of gold = 19.3 g/cm3 and density of copper = 8.96 g/cm3
So here we have to calculate percentage by mass = ?
19.3x + 8.96y = 8.62
x + y = 0.475 this is the volume
x = 0,421947674 and y = 0,0530523256
So, 19.3 × 0,421947674 × 100% / 8.62 = 94,4732031% of gold
and 100-94,4732031 = 5,5267969% of copper
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Which option describes the particles of water as the liquid water actively boils?
(1 point)
Responses
The particles will have the same average kinetic energy and the same temperature during boiling.
The particles will lose kinetic energy and increase temperature during boiling.
The particles will have the same average kinetic energy and a decrease in temperature during boiling.
The particles will lose kinetic energy and decrease temperature during boiling.
2.
What does temperature measure? (1 point)
Responses
the empty space between the particles
the average kinetic energy of the particles
the heat of the particles
the total energy of the particles
3.
Which is the best interpretation of the two flat portions of the graph?
(1 point)
Responses
These show where kinetic energy is increasing.
These show where changes of state are occurring.
These show where temperature is 0ºC.
These show where thermal energy does not exist.
The particles will lose kinetic energy and increase the temperature during boiling. Temperature measures the heat of particles. The flat portions show where kinetic energy is energy.
What is kinetic energy?
Kinetic energy is a type of energy that a moving object or particle has. An item accumulates kinetic energy when work, which involves the transfer of energy, is done on it by exerting a net force.
A moving object or particle has kinetic energy, which relies on both its mass and its rate of motion. The kind of motion might be vibration, rotation on an axis, translation (or travel along a path from one point to another), or any combination of these.
Therefore the correct options are 1- B, 2-B, and 3-A.
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Why is an acid able to produce ions in aqueous solution? assume that the general formula of an acid is given by ha, where a is usually a halogen or oxygen atom.
An acid is able to produce ions in the aqueous solution because polar H-A bond break due to the attraction between H atoms and the O atoms of water.
When an acid is dissolved in an aqueous solution, it forms hydrogen ions along with a conjugate base.
After dissolving in water, an acid dissociates to form hydrogen ions or H+ ions which reacts with water molecules to form hydronium ions i.e. H3O+.
Let's take this, the dissociation of hcl produces h+ ions and cl- ions in water.
HCl ⇄ H+ + cl-
The ions in aqueous solution help in electricity conduction. In the absence of water acids can not dissociate.
To put it simply, acids produce ions only when they are added to water.
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supposed chemists attempt to produce an element with atomic number 119 based on it’s likely position on the periodic table what would you expect it’s electronegativity to be? explain how you can make this prediction
An element with atomic number 119 will be an alkali metal with a +1 oxidation state which makes it highly electronegative.
What is Electronegativity?This is described as the tendency of the atom of an element to attract electrons so as to form a bond. This is done so that the elements can achieve a stable octet configuration.
On the other hand, if an element with atomic number 119 was present based on it’s likely position on the periodic table then it will most likely be an alkali metal with a +1 oxidation state and will be highly electronegative as it requires the loss of only one electron in other to achieve a stable configuration thereby making it highly reactive.
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using standard electrode potentials, calculate δg∘ and use its value to estimate the equilibrium constant for each of the reactions at 25 ∘c. part a pb2 (aq) mg(s)→pb(s) mg2 (aq)
The equilibrium constant can be obtained using ΔG°rxn = -RT lnK.
On the basis of this, 2H+ + 2e- → H2(g) reduction.
Therefore E° = 0V
Pb2+ + 2e- ⇄ Pb(s) - 0.126
Mg2+ + 2e- ⇄ Mg(s) -2.372
For total E°cell potential,
E°cell = Ered - Eoxd
Eoxd = -Ered of the one being oxidised
E°cell = -2.372 - (-0.126) = -2.246
E°cell = -2.246 V
Thus, calculating dG:
dG = -n x F x E°cell
dG = -2*96500*(-2.246)
=433478 J/mol
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Explain why the liquid in a thermometer expands as temperature increases. How is this related to the kinetic energy of the partical that makes up the liquid
When the temperature of the liquid increases, the liquid will have greater kinetic energy, so they move about more and spread apart, This will cause the expansion of the liquid in the thermometer.
What is kinetic theory of matter?
The kinetic theory of matter also known as particle theory of matter states that all matter consists of many, very small particles which are constantly moving or in a continual state of motion.
The three states of matter include;
liquid statesolid stategaseous stateThe distance between the molecule of each state of matter increases with increase in temperature.
The distance between the molecules of liquid is greater than that of solid while the distance between the gaseous molecules is the greatest.
Thus, when the temperature of the liquid increases, the liquid will have greater kinetic energy, so they move about more and spread apart, This will cause the expansion of the liquid in the thermometer.
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HELP PLS ITS IMPORTANT
Calculate the heat in kJ required to change 10.0 g of water at 20.0°C into steam at 120.0°C. The specific heat of ice, water and steam is 2.108 J/g*°C, 4.18 J/g*°C, 2.010 J/g*°C respectively. Hf for H2O = 334 J/g, Hv for H2O = 2260 J/g.
The total heat added is obtained as 26.36 kJ.
What is the heat required?We know that heat is the form of energy that exists due to the temperature difference between two bodies. Now when we heat water, we add heat to the water and the effect is that the temperature of the water would begin to rise and this owes to the heat that we have added to the water.
We know from the question that;
Mass of water = 10.0 g
Specific Heat capacity of liquid water = 4.18 J/g*°C
Specific Heat capacity of steam = 2.108 J/g*°C
Heat of vaporization of water = 2260 J/g
H = (10 * 4.18 * (100 - 20)) + (10 * 2260) + (10 * 2.108 * (120 - 100))
H = 3344 + 22600 + 421.6
H = 26.36 kJ
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