Question 1

Which is a unit of energy, but is not the SI unit of energy?

Accepted Answer

The calorie is a unit of energy, but the SI unit of energy is the joule.

Question 2

Which is a unit of energy?

Accepted Answer

Joule is the SI unit of energy.

Question 3

Chemical energy is

Accepted Answer

Chemical energy is the potential energy stored in the bonds of chemical compounds, which can be released or absorbed during a chemical reaction.

Question 4

Calculate the kinetic energy (KE)of an object that has a mass of 5.00 × 10² g and is traveling in a straight line with a speed of 50.0 m s^-1. (1 J = 1 kg m²^s^-2.)

Accepted Answer

Kinetic energy (KE) = 1/2 * mass * velocity^2KE = 1/2 * 5.00 × 10^2 g * (50.0 m s^-1)^2KE = 1/2 * 5.00 × 10^-1 kg * (50.0 m s^-1)^2KE = 1/2 * 2500 kg m^2 s^-2KE = 1250 JKE = 1.25 kJ

Question 5

Calculate the kinetic energy (KE)of an object that has a mass of 9.00 × 10² g and is traveling in a straight line with a speed of 4.0 × 10¹ m s^-1. (1 J = 1 kg m²^s^-2⁾

Accepted Answer

KE = 1/2 mv^2 = 1/2 * 0.9 kg * (40 m/s)^2 = 0.72 kJ

Question 6

Calculate the kinetic energy (KE)of an object that has a mass of 1.200 × 10³ g and is traveling in a straight line with a speed of 5.0 × 10¹ m s^-1. (1 J = 1 kg m²^s^-2⁾

Accepted Answer

Kinetic energy (KE) = 1/2 * mass * velocity^2= 1/2 * 1.200 × 10^3 g * (5.0 × 10^1 m s^-1)^2= 1/2 * 1.200 × 10^3 g * 25.0 × 10^2 m^2 s^-2= 1/2 * 3.00 × 10^6 g m^2 s^-2= 1.50 × 10^6 g m^2 s^-2= 1.50 kJ

Question 7

Calculate the kinetic energy (KE)of an object that has a mass of 2.45 kg and is traveling in a straight line with a speed of 12.0 m s^-1. (1 J = 1 kg m²^s^-2)

Accepted Answer

The answer of Calculate the kinetic energy (KE)of an object...

Question 8

How many kilojoules are equivalent to 8.18 kilocalories?

Accepted Answer

1 kilocalorie is equivalent to 4.184 kilojoules. Therefore, 8.18 kilocalories is equivalent to 8.18 * 4.184 = 34.2 kilojoules.

Question 9

How many kilocalories are equivalent to 18.9 kilojoules?

Accepted Answer

1 kilocalorie is equivalent to 4.184 kilojoules. Therefore, 18.9 kilojoules is equivalent to 18.9 / 4.184 = 4.52 kilocalories.

Question 10

Which statement is true?

Accepted Answer

All molecules, whether in gases, liquids, or solids, possess kinetic energy because they are in constant motion, although the extent and type of motion vary with the state of matter.

Question 11

For a chemical reaction, where the internal energy is given the symbol E,

Accepted Answer

The answer of For a chemical reaction, where the internal...

Question 12

Which statement is incorrect?

Accepted Answer

The answer of Which statement is incorrect?
...

Question 13

Which statement is true?

Accepted Answer

A state function is determined by the state of the system, which includes properties like composition, volume, temperature, and pressure, and not by the path taken to reach that state.

Question 14

A freshly baked pie is placed near an open window to cool. Which of the following statements best describes this situation?

Accepted Answer

The pie is considered the system and it loses heat to the surroundings as it cools down.

Question 15

A system that does not allow the transfer of mass but does allow the transfer of thermal energy would best be classified as Hint: Consider this from the thermodynamic perspective.

Accepted Answer

A closed system allows the transfer of energy (such as heat) but not mass across its boundaries.

Question 16

A system that allows the transfer of mass and allows the transfer of thermal energy would best be classified as

Accepted Answer

An open system allows the transfer of mass and energy, which is the definition of an open system.

Question 17

A certain oil used in industrial transformers has a density of 1.068 g mL^-1 and a specific heat of 1.628 J g^-1 °C^-1. Calculate the heat capacity of one gallon of this oil. (1 gallon = 3.785 liters)

Accepted Answer

First, convert gallons to milliliters: 1 gallon = 3.785 liters = 3785 mL. Then, calculate the mass: mass = volume × density = 3785 mL × 1.068 g/mL = 4042.98 g. Finally, calculate the heat capacity: heat capacity = mass × specific heat = 4042.98 g × 1.628 J/g°C = 6581.06 J/°C = 6.581 kJ/°C.

Question 18

A certain oil used in industrial transformers has a density of 1.086 g mL^-1 and a specific heat of 1.826 J g^-1 °C^-1. Calculate the heat capacity of one gallon of this oil. (1 gallon = 3.785 liters)

Accepted Answer

To find the heat capacity, first calculate the mass of the oil in one gallon: 3.785 L * 1.086 g/mL = 4107.51 g. Then, multiply the mass by the specific heat: 4107.51 g * 1.826 J/g°C = 7506.1 J/°C, which is 7.506 kJ/°C.

Question 19

A 500.0 gram sample of aluminum is initially at 25.0 °C. It absorbs 32.60 kJ of heat from its surroundings. What is its final temperature, in ^°C? (specific heat = 0.9930 J g^-1 °C^-1 for aluminum)

Accepted Answer

The answer of A 500.0 gram sample of aluminum is...

Question 20

A 113.25 gram sample of gold is initially at 100.0 ^°C. It gains 20.00 J of heat from its surroundings. What is its final temperature? (specific heat of gold = 0.129 J g^-1 ^°C^-1)

Accepted Answer

The heat gained by the gold is given by:Q = mC_pΔTwhere:Q is the heat gained (in J)m is the mass of the gold (in g)C_p is the specific heat of gold (in J g^-1 ^°C^-1)ΔT is the change in temperature (in ^°C)Substituting the given values into the equation, we get:20.00 J = (113.25 g)(0.129 J g^-1 ^°C^-1)ΔTSolving for ΔT, we get:ΔT = 20.00 J / (113.25 g)(0.129 J g^-1 ^°C^-1) = 1.43 ^°CTherefore, the final temperature of the gold is:T_final = T_initial + ΔT = 100.0 ^°C + 1.43 ^°C = 101.4 ^°C

Quiz 7: Energy and Chemical Change

Which is a unit of energy, but is not the SI unit of energy?

Which is a unit of energy?

Chemical energy is

Calculate the kinetic energy (KE) of an object that has a mass of 5.00 × 10² g and is traveling in a straight line with a speed of 50.0 m s^-1. (1 J = 1 kg m²^s^-2.)

Calculate the kinetic energy (KE) of an object that has a mass of 9.00 × 10² g and is traveling in a straight line with a speed of 4.0 × 10¹ m s^-1. (1 J = 1 kg m²^s^-2⁾

Calculate the kinetic energy (KE) of an object that has a mass of 1.200 × 10³ g and is traveling in a straight line with a speed of 5.0 × 10¹ m s^-1. (1 J = 1 kg m²^s^-2⁾

Calculate the kinetic energy (KE) of an object that has a mass of 2.45 kg and is traveling in a straight line with a speed of 12.0 m s^-1. (1 J = 1 kg m²^s^-2)

How many kilojoules are equivalent to 8.18 kilocalories?

How many kilocalories are equivalent to 18.9 kilojoules?

Which statement is true?

For a chemical reaction, where the internal energy is given the symbol E,

Which statement is incorrect?

Which statement is true?

A freshly baked pie is placed near an open window to cool. Which of the following statements best describes this situation?

A system that does not allow the transfer of mass but does allow the transfer of thermal energy would best be classified as Hint: Consider this from the thermodynamic perspective.

A system that allows the transfer of mass and allows the transfer of thermal energy would best be classified as

A certain oil used in industrial transformers has a density of 1.068 g mL^-1 and a specific heat of 1.628 J g^-1 °C^-1. Calculate the heat capacity of one gallon of this oil. (1 gallon = 3.785 liters)

A certain oil used in industrial transformers has a density of 1.086 g mL^-1 and a specific heat of 1.826 J g^-1 °C^-1. Calculate the heat capacity of one gallon of this oil. (1 gallon = 3.785 liters)

A 500.0 gram sample of aluminum is initially at 25.0 °C. It absorbs 32.60 kJ of heat from its surroundings. What is its final temperature, in ^°C? (specific heat = 0.9930 J g^-1 °C^-1 for aluminum)

A 113.25 gram sample of gold is initially at 100.0 ^°C. It gains 20.00 J of heat from its surroundings. What is its final temperature? (specific heat of gold = 0.129 J g^-1 ^°C^-1)

Quiz 7: Energy and Chemical Change

Which is a unit of energy, but is not the SI unit of energy?

Which is a unit of energy?

Chemical energy is

Calculate the kinetic energy (KE) of an object that has a mass of 5.00 × 102 g and is traveling in a straight line with a speed of 50.0 m s-1. (1 J = 1 kg m2s-2.)

Calculate the kinetic energy (KE) of an object that has a mass of 9.00 × 102 g and is traveling in a straight line with a speed of 4.0 × 101 m s-1. (1 J = 1 kg m2s-2)

Calculate the kinetic energy (KE) of an object that has a mass of 1.200 × 103 g and is traveling in a straight line with a speed of 5.0 × 101 m s-1. (1 J = 1 kg m2s-2)

Calculate the kinetic energy (KE) of an object that has a mass of 2.45 kg and is traveling in a straight line with a speed of 12.0 m s-1. (1 J = 1 kg m2s-2)

How many kilojoules are equivalent to 8.18 kilocalories?

How many kilocalories are equivalent to 18.9 kilojoules?

Which statement is true?

For a chemical reaction, where the internal energy is given the symbol E,

Which statement is incorrect?

Which statement is true?

A freshly baked pie is placed near an open window to cool. Which of the following statements best describes this situation?

A system that does not allow the transfer of mass but does allow the transfer of thermal energy would best be classified as Hint: Consider this from the thermodynamic perspective.

A system that allows the transfer of mass and allows the transfer of thermal energy would best be classified as

A certain oil used in industrial transformers has a density of 1.068 g mL-1 and a specific heat of 1.628 J g-1 °C-1. Calculate the heat capacity of one gallon of this oil. (1 gallon = 3.785 liters)

A certain oil used in industrial transformers has a density of 1.086 g mL-1 and a specific heat of 1.826 J g-1 °C-1. Calculate the heat capacity of one gallon of this oil. (1 gallon = 3.785 liters)

A 500.0 gram sample of aluminum is initially at 25.0 °C. It absorbs 32.60 kJ of heat from its surroundings. What is its final temperature, in °C? (specific heat = 0.9930 J g-1 °C-1 for aluminum)

A 113.25 gram sample of gold is initially at 100.0 °C. It gains 20.00 J of heat from its surroundings. What is its final temperature? (specific heat of gold = 0.129 J g-1 °C-1)

Calculate the kinetic energy (KE) of an object that has a mass of 5.00 × 10² g and is traveling in a straight line with a speed of 50.0 m s^-1. (1 J = 1 kg m²^s^-2.)

Calculate the kinetic energy (KE) of an object that has a mass of 9.00 × 10² g and is traveling in a straight line with a speed of 4.0 × 10¹ m s^-1. (1 J = 1 kg m²^s^-2⁾

Calculate the kinetic energy (KE) of an object that has a mass of 1.200 × 10³ g and is traveling in a straight line with a speed of 5.0 × 10¹ m s^-1. (1 J = 1 kg m²^s^-2⁾

Calculate the kinetic energy (KE) of an object that has a mass of 2.45 kg and is traveling in a straight line with a speed of 12.0 m s^-1. (1 J = 1 kg m²^s^-2)

A certain oil used in industrial transformers has a density of 1.068 g mL^-1 and a specific heat of 1.628 J g^-1 °C^-1. Calculate the heat capacity of one gallon of this oil. (1 gallon = 3.785 liters)

A certain oil used in industrial transformers has a density of 1.086 g mL^-1 and a specific heat of 1.826 J g^-1 °C^-1. Calculate the heat capacity of one gallon of this oil. (1 gallon = 3.785 liters)

A 500.0 gram sample of aluminum is initially at 25.0 °C. It absorbs 32.60 kJ of heat from its surroundings. What is its final temperature, in ^°C? (specific heat = 0.9930 J g^-1 °C^-1 for aluminum)

A 113.25 gram sample of gold is initially at 100.0 ^°C. It gains 20.00 J of heat from its surroundings. What is its final temperature? (specific heat of gold = 0.129 J g^-1 ^°C^-1)