The diagram shows the potential energy changes for a reaction pathway. (10 points)

A curved lined graph is shown. The y axis of the graph has the title Potential Energy. The x axis of the graph has the title Reaction Pathway. The graph curve begins at a higher level and ends at a slightly lower level. A vertical line labeled A, starting from the x axis till the beginning of the graph line is shown. A vertical line labeled B, starting from the x axis till the uppermost hump in the graph curve is shown. Another vertical line labeled C is shown from starting from the x axis till the point where the graph curve ends.

Part 1: Does the diagram illustrate an endothermic or an exothermic reaction? Give reasons in support of your answer.

Part 2: Describe how you can determine the total change in enthalpy and activation energy from the diagram and if each is positive or negative.

The pH of a solution that contains 0.0011 moles of KOH in 393 mL of solution is 2.56. Details about pH can be found below.

The pH of a solution can be calculated using the following expression:

pH = - log [H3O+]

However, the hydrogen concentration of the KOH solution can be calculated as follows:

concentration = 0.0011 mol ÷ 0.393 L

concentration = 2.798 × 10-³M

The pH of KOH = - log [2.798 × 10-³M]

pH = 2.56

Therefore, the pH of a solution that contains 0.0011 moles of KOH in 393 mL of solution is 2.56.

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Answer:

A hypothesis is a testable statement that is proposed to explain an observation/theory. In this case, one hypothesis that could be used is: Taller people have longer arms than smaller people. You could also say: As the height of an individual increases, the length of their arms also increases.

Independent variables are the variable that is manipulated. In this case, the independent variable is the height of the individual.

Dependent variables are those that change in response to the independent variable. In this case, the dependent variable is arm length.

Answer:

4 moles

Explanation:

For every mole of deuteriomethane consumed, 4 moles of water are produced.

So, the answer is 4 moles.

A) Anode - hydrogen gas

Cathode-oxygen gas

B) Hydrogen gas - The gas burns with a pop sound

Oxygen gas - The gas rekindles a glowing splint

C) The volume of gas produced at the cathode is 23 [tex]cm^3[/tex]

Electrolysis is the process by which electric current is passed through a substance to effect a chemical change.

The electrolysis of water produces two volumes of hydrogen at the anode and one volume of oxygen at the cathode.

The hydrogen gas burns with a pop sound. It is easily identified by this test. Also, oxygen is known to rekindle a glowing splint and this is a commonly used test for oxygen gas.

Since the ratio of hydrogen produced at the anode to oxygen produced at the cathode is 2:1 by volume; then when 23 [tex]cm^3[/tex] of oxygen is produced at the cathode, 46 [tex]cm^3[/tex]of hydrogen is produced at the anode.

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Answer: C

Explanation:

This is a fact.

The overall order of the reaction is 3 and the rate law for the reaction is rate =  [A]^n [B]^m [C]^l

1) The order of reactant A is first order reactant because a first-order reaction can be defined as a chemical reaction in which the reaction rate is linearly dependent on the concentration of only one reactant.

The order of reactant B is second order reactant because a second order reaction is a type of chemical reaction that depends on the concentrations of one-second order reactant or two first-order reactants.

Thus, the overall order of the reaction is 3.

2) The rate law in this reaction is;

rate =  [A]^n [B]^m [C]^l

But in this question, since the reactant C is zero order, then it will be simplified to; rate = k[A][B]² .

3) When we plug in the initial concentrations of A and B, we will get the rate constant of the problem which is k = 20.

4) The initial rate when [A]0=4.87 mmol⋅L−1 , [B]0=0.184 mmol⋅L−1 , and [C]0=12.0 mmol⋅L−1 is;

Rate = 20 * 4.87 * 0.184²

Rate = 3.3

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Each star on the map represents location of an epicenter. Thus, the correct answer is Option A.

Epicenter is defined as the point directly at the position on the Earth's surface, where the earthquake started. These are represented by the stars on the map.

Scientists use triangulation to find the epicenter of an earthquake.

When seismic data is collected from at least three different locations, it can be used to determine the epicenter by where it intersects.

Every earthquake is recorded on numerous seismographs located in different directions.

Thus, the correct answer is Option A.

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Answer: C. location of a seismograph

Explanation:

Answer:

Permanent = false

Explanation:

All of the other choices are true

Answer:

When seismic waves from earthquakes ripple through its solid center, they hit a speed bump. The seismic vibrations should zip along about 30 percent faster than their actual speed, according to experiments and computer models re-creating the conditions inside the inner core.

Answer:

C. It is the ratio of the concentrations of products to the

concentrations of reactants.

Explanation:

11460 years ago a sample of wood was the part of a living tree.

The time required for half of something to undergo a process.

Carbon-14 has a half-life of 5,730 years. That means that no matter how many carbon-14 atoms were present when something died, after 5,730 years only half of them are left the rest have decayed to nitrogen.

The half life of C-14 is [tex]t_{\frac{1}{2}}[/tex] =5730 years.

This means that if you start with a sample of 100g, only 50g will be left in 5730 years.

Here, Only 25g is left, therefore the number of years is =5730 × 2  = 11460years.

Hence, 11460 years ago a sample of wood was the part of a living tree.

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At constant temperature and pressure, If the amount of gas increases to the given value, its volume also increases to 20.85L.

Avogadro's law states that "equal volumes of all gases, at the same temperature and pressure, have the same number of molecules."

It is expressed as;

V₁/n₁ = V₂/n₂

Given the data in the question;

V₁/n₁ = V₂/n₂

V₁n₂ = V₂n₁

V₂ = V₁n₂ / n₁

V₂ = (13.9L × 3moles) / 2moles

V₂ = 41.7molL / 2mol

V₂ = 20.85L

At constant temperature and pressure, If the amount of gas increases to the given value, its volume also increases to 20.85L.

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The solubility of Ca(OH)2 in a 0.469M CaCl2 solution at 31°C, at given Ksp of Ca(OH)2 is determined as 1.626 mM.

The dissociation reaction of Ca(OH)2 is given as follows;

Ca(OH)₂  ⇄ Ca²⁺  + 2OH⁻¹

                     x           2x

Concentration of Ca²⁺ = 0.469 M

Ksp = [x][2x]²

ksp = (0.469)(2x²)

ksp = 4(0.469)x²

ksp = 1.876x²

4.96 x 10⁻⁶ = 1.876x²

x² = (4.96 x 10⁻⁶)/(1.876)

x² = 2.643 x 10⁻⁶

x = √(2.643 x 10⁻⁶)

x = 1.626 x 10⁻³ M

x = 1.626 mM

Thus, the solubility of Ca(OH)2 in a 0.469M CaCl2 solution at 31°C, at given Ksp of Ca(OH)2 is determined as 1.626 mM.

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Answer: 4.2

Explanation:

[tex]M_{A}V_{A}=M_{B}V_{B}\\(12)V_{A}=(250)(0.20)\\V_{A}=\frac{(250)(0.20)}{12}=\boxed{4.2}[/tex]

Bubbling or fizzing is usually observed when a chemical reaction occurs and is denoted as option D.

This occurs when one or more reactant form a new substance which is referred to as the product.

The bubbling or fizzing depicts effervescence which signifies that a new gaseous product has been formed.

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The altered activity of the Pyruvate dehydrogenase enzyme is most likely contributing to his symptoms.

Pyruvate dehydrogenase is an enzyme that catalyzes the conversion of pyruvate to generate dihydrolipoamide and CO2.

This enzyme (Pyruvate dehydrogenase) is required to metabolize alcohol present in the blood.

In conclusion, the altered activity of the Pyruvate dehydrogenase enzyme is most likely contributing to his symptoms.

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Equilibrium will shift towards the products when temperature is decreased in an exothermic reaction of the  formation of ammonia.

An exothermic reaction is a reaction in which heat content of the reactants is greater than the heat content of product.

In an exothermic reaction, heat is given off.

For an exothermic reaction in equilibrium, increasing temperature shifts equilibrium to the towards the left, towards the reactants.

On the other, equilibrium will shift towards the products when temperature is decreased.

Therefore, equilibrium will shift towards the products when temperature is decreased in the reaction of the  formation of ammonia.

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Answer:

Anhydrous copper (II) sulphate is white because it has no water in it. When drops of water are added, copper (II) sulphate turns blue. This colour change can be used to detect the presence of water (or water vapour).

Answer:

hope this helped :( got this from my friend a long time ago but still not sure if it's really correct this

The number of moles of Cr deposited by 1.5 F of electricity is 0.5 moles

The term electrolysis has to do with thee deposition of a solid when a direct current is passed through its solution.

Given the reaction;  Cr3+(aq)  + 3e ––›Cr(s)

If 3F of electricity is required to deposit  1 mole of Cr

1.5F of electricity is required to deposit  1.5F * 1 mole/3F

= 0.5 moles

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Answer:

283 grams KCl

Explanation:

To convert form moles to grams, you need to find the molar mass of your compound. The molar mass can be calculated using the individual molar masses of each element in the compound. These values can be found on the periodic table.

Molar Mass (K) = 39.098 g/mol

Molar Mass (Cl) = 35.453 g/mol

Molar Mass (KCl) = 39.098 g/mol + 35.453 g/mol

Molar Mass (KCl) = 74.551 g/mol

Now that you know the molar mass, you want to multiply it by the moles of KCl. This is possible because the molar mass is actually a ratio representing the relationship of grams and moles. In KCl, there are 74.551 grams of KCl for every 1 mole of KCl. When you are multiplying, make sure you set the ratio up in a way that allows for the units to cancel out and leave grams as your final answer.

3.80 moles KCl           74.551 g
-----------------------  x  -------------------  = 283 grams KCl
                                  1 mole KCl

The final answer should have 3 sig figs because the value the problem gave (3.80 mol) also has 3 sig figs.

Answer:

.4998 atm    ( rounded to .5 atm   ) <===== not one of the answers listed

Explanation:

The partial pressure exerted by O2   is   equal to the fraction that is O2 times the pressure

1.5 / ( 1.5 + 1.2 + .301 )   * 1 atm = .4998 atm  

( 1) Are you sure it is   ONE atm pressure in the container?

(2) IS the first answer supposed to be   5 x 10^-1  atm    perhaps?

Graphite is structured in a way that: (A). Its carbon atoms are bonded to 3 other carbon atoms and are structured in layers that can slip past each other.

A graphite can be defined as a crystalline form of carbon.

Graphite is so important to man as it is used in many industries and factories as well as many countries to produce different products that can help mankind.

Graphite structure is quite a complex one and it involve carbons that have three of its electrons bonded and one free.

In conclusion, Graphite is structured in a way that: Its carbon atoms are bonded to 3 other carbon atoms and are structured in layers that can slip past each other.

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345678990098765435779999999999999999995699999

Answer:

because cotton have a good absorbing quality and can absorb water more which is used to mop the floor

Explanation:

Answer:

A. The energy required to completely melt 1 g of a substance.

Explanation:

Because the root definition for Specific Heat Capacity is basically the amount of heat that's absorbed per unit mass of whatever material when the temperature is increasing. Or in other words, the amount of heat that's taken out or supplied to the unit mass of a system in order to increase or decrease its temperature by one degree. Hope this helps :)

Answer:

2 mole of C4H10 were used in this reaction.

Succinic acid most probably

Lets see why?

The molar mass is given as 118.084g/mol

Decimal next place i.e 10th place contains 0 means it has OH bonds in most of the cases.

So it's a hydrocarbon and more closely an alcohol or aldehyde

Let's verify

Approximately equal

see the attached file!!!