Energy, Rate and Equilibrium - Part 2 of 3 Exam Prep | Practice Questions & Video Solutions

7. Energy, Rate and Equilibrium - Part 2 of 3

Problem 1
Problem 2
Problem 3
Problem 4
Problem 5
Problem 6
Problem 7
Problem 8
Problem 9
Problem 10
Problem 11

7. Energy, Rate and Equilibrium - Part 2 of 3

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7. Energy, Rate and Equilibrium - Part 2 of 3

11 problems

1PRACTICE PROBLEM

There are three metals: calcium, lead, and nickel. At 25.0°C, 20.0-g samples of each metal are supplied with the same quantity of heat. Using the specific heat capacities in the table below, determine which metal would reach the highest temperature.

Table showing specific heat capacities of calcium, lead, and nickel for heat capacity comparison.

2PRACTICE PROBLEM

The temperature of a 1.00 g sample rose by 30.0 °C when 13.5 J or 3.22 cal of heat was applied to it. Determine the specific heat of the sample and identify its identity from the pool of substances with their specific heat values below.

Aluminum (0.897 J/g•°C)

Iron (0.449 J/g•°C)

Nickel (0.444 J/g•°C)

Palladium (0.246 J/g•°C)

3PRACTICE PROBLEM

Ethyl acetate is a solvent used for recrystallization processes. Ethyl acetate has a specific heat of 0.455 cal/g•°C. Calculate the heat energy lost in the cooling process when 111 g of ethyl acetate was heated to its boiling point (77.1°C) to dissolve a sample and then cooled down to room temperature (25.0°C). Assume that the specific heat does not change.

4PRACTICE PROBLEM

A sample of an alloy weighing 65.00 g with a temperature of 90.00°C is dropped into 120.0 g of water at 25.00°C. The final temperature of both the alloy and the water is 40.00°C. Calculate the specific heat capacity of the alloy if the specific heat of water is 4.184 J/(g•°C).

5PRACTICE PROBLEM

Based on the following reaction,

Ge(s) + 2 F₂(g) → GeF₄(g)

what is the effect on the reaction rate if three moles of Ge are removed?

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6PRACTICE PROBLEM

Consider the following reaction: SiC (hexagonal) → SiC (cubic), ΔG = –0.598 kcal/mol (–2.50 kJ/mol) at 25°C. Explain why SiC (hexagonal) lasts for a long period of time even though the reaction is spontaneous.

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7PRACTICE PROBLEM

Which statements explains the energy requirements of chemical reactions?

A) The rate of reaction increases with both increasing temperature and activation energy.

B) The rate of reaction increases with increasing temperature and decreasing activation energy.

C) The rate of reaction increases with decreasing temperature and increasing activation energy.

D) The rate of reaction increases with both decreasing temperature and activation energy.

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8PRACTICE PROBLEM

Show the energy diagram for an exothermic reaction and label it with Energy, Reaction progression, Reactants, Products, and ΔH.

9PRACTICE PROBLEM

Which of the following describes the reaction in the energy diagram below?

Energy diagram illustrating reaction rates and stability of reactants and products.

10PRACTICE PROBLEM

Below are the potential energy profiles for three reactions. Which of the following statements is true?

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11PRACTICE PROBLEM

Identify the reaction which does not show a homogenous equilibrium.

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