CfE Review 2024

For the formula:
 Q= m c ∆T
The  units for specific heat are:

• g /J C
• °C/g J
• kJ/g
• J/g°C

What would be the effect on the particles if more heat is supplied to the system?

• They would slow down
• They would stop moving
• They would speed up
• There would be no effect

Thermal energy ALWAYS moves from _____ to _____.

• solid to liquid
• ice to water
• hot to cold
• solid to gas

If the specific heat of water is 4,186 J/kg∙°C, how much heat is required to increase the temperature of 1.2 kg of water from 23 °C to 39 °C? 

• -80,371.2
• 44,938.6
• 80,371.2
• 112,575.9

What is the specific heat of an unknown substance if 20 kg of it at 400 °C reaches an equilibrium temperature of 351 °C when it comes in contact with a piece of aluminum.  The aluminum weighs 55 kg and had an initial temperature of 4 °C?  (Specific heat of aluminum is 903 J/kg °C)  Use the equation mC(T_f – T_i) + mC(T_f – T_i)= 0

• 17,233,755
• -17,233,755
• 17,585.46
• 723

The SI unit of heat and energy is the __________.

• calorie
• heat
• joule
• watt

A sample of iron receives 50.J of heat energy that raises the temperature of the iron by 25.0°C. If iron has a specific heat of 0.10 J/g°C, what is the mass of the iron sample?  (show your work)

• 25g
• 30g
• 20g
• 50g

A reaction is performed in a beaker with a temperature probe recording the temperature changes of the reaction.  If the temperature began at 15.0 degrees Celsius and ended at 27.5 degrees Celsius. Is the reaction endothermic or exothermic?

• Exothermic
• Endothermic

Calorimeters use insulating materials to:

• encourage affordable materials in science experiments in schools.
• preserve the heat of the environment outside the styrofoam cup.

• prevent heat from escaping to the environment.
• keep the liquid inside the styrofoam cup from overheating.

What does "ΔT" mean?

• A change in health

• A change in heat

• A change in height

• A change in temperature