APC: Thermochemistry

The potential energy diagram of a reaction is shown. Which statement below is correct relating to this reaction?

• #1 represents the enthalpy change for this exothermic reaction.

• #2 represents the enthalpy change for this endothermic reaction.

• #3 represents the enthalpy change for this endothermic reaction.

• #4 represents the enthalpy change for this exothermic reaction.

Tags

NGSS.HS-PS1-4

The diagram represents two solids and the temperature of each. What occurs when the two solids are placed in contact with each other?

• Heat energy flows from solid A to solid B. Solid A decreases in temperature

• Heat energy flows from solid A to solid B. Solid A increases in temperature

• Heat energy flows from solid B to solid A. Solid B decreases in temperature.

• Heat energy flows from solid B to solid A. Solid B increases in temperature.

Tags

NGSS.HS-PS3-4

Ice cream melting is an example of an __________ process.

• endothermic

• exothermic

Tags

NGSS.HS-PS3-4

What does "c" stand for?

• heat capacity

• specific heat

• mass

• temperature

When heat flows from system to the surroundings that is an example of an ________________ process.

• exothermic

• endothermic

Tags

NGSS.HS-PS3-4

What device is used to measure the amount of heat involved in a chemical reaction or physical process?

• barometer

• calorimeter

• thermometer

The specific heat of aluminum is 0.90 J/g°C.  How much heat(q) is released when a 10.0 g piece of aluminum foil is taken out of the oven and cools from 100° to 50°?

• 0.45 kJ

• 4.5 J

• 45 J

• 450 kJ

Tags

NGSS.HS-PS3-4

NGSS.HS-PS3-1

Energy is stored in chemical bonds.

• TRUE

• FALSE

Tags

NGSS.HS-PS1-4

NGSS.HS-LS1-7

What does the heat capacity of an object measure?

• the amount of energy required to change the temperature of an object by 1°C

• the total amount of energy an object can store

• the amount of energy required to change the temperature of one gram of a substance 1°C

• the amount of energy required to melt a solid object

When applying the first law of thermodynamics to a system, when is heat a positive quantity?

• when the system does work
• when the system has work done on it
• when the system absorbs heat
• when the system loses heat

Tags

NGSS.HS-PS3-4