Test #6 Review: Enthalpy

 _?_  is the amount of energy required to raise the temperature of 1 gram of any substance 1^oC.

• Specific heat
• A calorie
• Thermal energy
• Conduction

As 120 g of hot milk cools in a mug, it transfers 20, 000 J of heat to the environment. What is the temperature change of the milk? The specific heat of milk is 2.6 J/g·°C. (Q=mcΔT)

• 64 °C
• 1.56 °C
• 640 °C
• cannot be determined

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

If 100 g of aluminum at 145ºC gains 6,800 J of heat, what is the final temperature (T_final) of the aluminum? Aluminum has a specific heat of 0.897 J/gºC. (Q=mcΔT)

• -69°C
• 0.52°C
• 221°C

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

The SI unit of heat and energy is the __________.

• calorie
• heat
• joule
• watt

Heat transfer _____ occurs from hot to cold.

• always

• never

• sometimes

• rarely

Tags

NGSS.HS-PS3-4

Temperature is a measure of average _____ energy of individual atoms.

• heat

• potential

• mechanical

• kinetic

If 25 J are required to change the temperature of 5.0 g of substance A by 2.0°C, what is the specific heat of substance A? 

• 250 J/g C
• 10 J/g C
• 63 J/g C
• 2.5 J/g C

Tags

NGSS.HS-PS3-4

If a chemical reaction is EXOTHERMIC, the temperature of the surroundings would....

• Stay the same

• Increase

• Decrease

Tags

NGSS.HS-PS1-4

When iron nails get rusty, heat is released.  What process is this?

• Exothermic
• Endothermic

Tags

NGSS.HS-PS1-4

Is the combustion of gasoline endothermic or exothermic?

• Endothermic
• Exothermic

Tags

NGSS.HS-PS1-4