Calorimetry

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

• g /J C
• °C/g J
• kJ/g
• J/g°C

Tags

NGSS.HS-PS3-1

If the specific heat of water is 4.18 J/g∙°C, how much heat is required to increase the temperature of 1.2 kg of water from 23 °C to 39 °C?

• -80,256 J

• +80.256 J

• +80,256 J

• -80.256 J

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?

• 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

Tags

NGSS.HS-PS1-4

What is a tool that measures the heat of chemical reactions?

• calorimeter
•  calorie
• Styrofoam™ cup
• none of these

Tags

NGSS.HS-PS1-4

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.

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-4

What does "ΔT" mean?

• A change in time

• A change in heat

• A change in energy

• A change in temperature

The specific heat of water is 4.18 J/g°C.

If 980. J of energy is added to 6.20 g of water at 18.0 °C, what is the final temperature of the water?

• 37.8 °C

• -19.8 °C

• 19.8 °C

• 55.8 °C

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

A calorimeter is made of copper because

• copper is a good conductor of heat

• copper has high specific heat capacity

• copper has low specific heat capacity

• Both option 3 and 1

An iron ball requires 5000 J heat energy to raise its temperature by 10⁰C. Calculate the heat capacity of the iron ball.

• 5 JK^-1

• 50 JK^-1

• 500 JK^-1

• 5000 JK^-1