McMenamy Ch 10/14

The capacity to do work or cause a change is a. energy b. specific heat c. activation energy d. motivation

a. energy

The amount of heat (q) transferred during a temperature change depends on

All of the above: the mass of the material the nature of the material changing temperature the size of the temperature change

Compare the temperatures of three different beakers of boiling water. One sample has been boiling for 5 minutes, another for 10 minutes, and the third for 15 minutes. Which beaker would be at the highest temperature? a. all of beakers would be at the same temperature b. the beaker that has been boiling for 5 minutes c. the beaker that has been boiling for 10 minutes d. the beaker that has been boiling for 15 minutes

a. All of the beakers would be at the same temperature.

The temperature of a beaker of warm water is measured to be a certain temperature. Then a large ice cube is added to the warm water. Why does the temperature of the water decrease? a. the ice cube absorbs heat energy from the water b. the coldness of the ice cube is released into the water c. the ice cube loses heat energy to the water d. the total energy of the system decreases

a. The ice cube absorbs heat energy from the water

Exactly 100 mL of water at 25 degrees Celsius and exactly 100 mL of alcohol at 25 degrees Celsius are both heated at the same rate under identical conditions. After 3 minutes, the temperature of the alcohol is 50 degrees Celsius. After 5 minutes, the temperature of the water reaches 50 degrees Celsius. Which of the following statements is TRUE about the heat supplied as the liquids warmed to 50 degrees Celsius? a. the water received more heat b. the alcohol received more heat c. both received the same amount of heat d. it is impossible to tell from the information given

a. The water received more heat.

Which if the following explains why alcohol took 3 minutes to warm to 50 degrees Celsius while water took 5 minutes to warm to 50 degrees Celsius? a. water has a higher specific heat than alcohol b. alcohol has a higher specific heat than water c. water has a higher boiling point than alcohol d. alcohol ha s a lower density

a. Water has a higher specific heat than alcohol.

"In any chemical or physical process, energy is neither created nor destroyed" is a statement of the a. law of conservation of energy b. law of conservation of mass c. law of physical and chemical change d. system

a. law of conservation of energy

The greater the kinetic energy of the particles in a sample of matter. a. the higher the temperature is b. the lower the temperature is c. the more heat the sample will absorb d. the less heat flows away from the sample

a. the higher the temperature is

Which of the following best describes temperature? a. heat absorbed or released in a chemical or physical change b. a measure of the average kinetic energy of the particles in a sample of matter c. heat energy d. energy of change

b. a measure of the average kinetic energy of the particles in a sample of matter.

Ice cream melting is an example of a. a chemical change b. a physical change c. energy d. an exothermic process

b. a physical change.

Recharging a heat pack by placing it in a pot of boiling water involves a. a transfer of energy as heat from system to surroundings b. a transfer of energy as heat from surroundings to system c. a transformation of chemical energy into energy as heat d. no transfer of energy as heat between the system and surroundings

b. a transfer of energy as heat from surrounding to system.

Energy is transferred from hot water to a cup. This energy is in form of a. chemical energy b. heat c. potential energy d. mechanical energy

b. heat

Activation energy is a. the energy stored in a chemical b. the minimum energy needed to start a reaction c. the amount of energy released during a reaction d. the energy used to compress a gas

b. the minimum energy needed to start a reaction.

Consider a beaker full of water at a temperature of 90 degrees Celsius. A person quickly pours out some of the water, and the temperature of the water remaining in the beaker is instantly measured. Which of the following statements is true? a. the temperature of the water left in the beaker has significantly decreased b. the temperature of the water has increased c. the temperature of the water in the beaker is the same d. the temperature change depends on exactly how much water was poured out

c. The temperature of the water in the beaker is the same.

For an exothermic reaction, the products a. are at the same energy level as the reactants b. have no energy c. are at a lower energy level than the reactants d. are at a higher energy level than the reactants

c. are at a lower energy level than the reactants.

The energy that results from the breaking or formation of chemical bond is a. temperature b. potential energy c. chemical energy d. kinetic energy

c. chemical energy.

In both endothermic and exothermic processes, energy is a. absorbed b. changed into matter c. conserved d. released

c. conserved

The energy transferred between objects at different temperatures is a. chemical energy b. potential energy c. heat d. temperature

c. heat.

Which of the following is a measure of the average kinetic energy of the particles in a sample of matter? a. chemical kinetics b. thermal energy c. heat d. temperature

d. Temperature

An energy change us involved in a. an exothermic process but not an endothermic process b. an endothermic process but not an exothermic process c. chemical changes but not physical changes d. both chemical changes and physical changes

d. both chemical changes and physical changes.

The specific heat of a given substance a. depends on the mass of the substance b. varies with temperature c. is the same as that for any other substance d. is unique to that substance

d. is unique to that substance.

Which of the following is an example of an endothermic process? a. water vapor condensing on a mirror b. water sprayed on orange trees freezing c. paper burning d. snow melting

d. snow melting