Unit 1-TEST. Matter, Energy, and Change

When elements bond together they use energy in the bonding process. What is this energy process called?

• specific energy

• kinetic energy

• chemical energy

• thermal energy

Tags

112.43.c.13.A

What law allows calories to be determined by heat transfer from one substance to another?

• The law of conservation of energy

• The law of definite proportions

• Avogadro's law

• Boyle's law

Water in an ice cube tray is put into the freezer section of a refrigerator. As it freezes, this water —

• loses all entropy

• increases in entropy

• decreases in entropy

• has constant entropy

Refer to the experimental set-up for calories in a chocolate chip cookie. How does this experiment allow students to measure the calories in a cookie?

• The difference in masses before and after the cookie is burned is determined, then converted into heat energy.

• Heat energy from the burning cookie is transferred to the water. The change in water temperature is used to calculate the heat energy from the cookie.

• Data from the amount of time for the cookie to burn and the temperature change are used to calculate the heat energy from the cookie.

• The cookie is burned until the water reaches a boiling temperature, then masses are compared to calculate the heat energy from the cookie.

Refer to the experimental set-up for calories in a chocolate chip cookie. What lab apparatus, used for measuring the amount of heat involved in a chemical reaction, did students try to build in this experimental design?

• Calorimeter

• Conductivity meter

• Thermograph

• Chromatographer

Which of the following is a source of heat loss in the transfer of heat energy from the cookie to the water?

• I. Surrounding air absorbed heat energy that was not transferred to the water in the can.

• II. Metal on the can absorbed heat energy that was not transferred to the water in the can.

• III. Metal on the ring stand absorbed heat energy that was not transferred to the water in the can.

When a molecule has its bonds broken, it sometimes gives off energy. This energy is then absorbed by the matter around it, increasing the speed of the molecules. How is this increased speed in the molecules measured?

• calculating the distance they traveled in a particular amount of time

• determining the change in temperature of the substance

• counting the number of bonds broken, and comparing that to the number of particles present

• the particles are too small, and any changes cannot be measured

Ice cubes are frequently used in drinks to cool the drink down. What is happening to the liquid in the cup and the ice cubes as the ice cubes are melting?

• Kinetic energy of the ice cubes and liquid are both increasing.

• Kinetic energy of the ice cubes and liquid are both decreasing.

• Kinetic energy of the ice cubes is increasing while the kinetic energy of the liquid is decreasing.

• Kinetic energy of the ice cubes is decreasing while the kinetic energy of the liquid is increasing.

A fire is an example of an exothermic reaction. Which of the following best supports that statement?

• The fire is creating energy.

• The fire is releasing energy.

• The fire is capturing energy.

• The fire is destroying energy.

An activated cold pack is an example of an endothermic reaction because thermal energy is —

• radiated

• absorbed

• released

• created