Chem 30 Thermochemistry Review - Diner

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

Tags

NGSS.HS-PS1-5

NGSS.HS-PS3-4

If two objects have different temperatures when they come in contact, heat will flow from the warmer object to the cooler one UNTIL ____________

• one reaches a temperature of zero

• they both have an equal temperature

• one runs out of energy

Tags

NGSS.HS-PS3-4

If the specific heat of water is 4.19 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 J

• 80 J

• 80 KJ

• -80.KJ

For a skillet, used for cooking, do you want a high or low specific heat

• High, so that it will need more energy to heat up

• Low, so that it will change temperature quickly

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?

• 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

In an exothermic process, the surroundings are gaining energy.

• True
• False

Tags

NGSS.HS-PS1-4

Endothermic or Exothermic?

CaCO₃(s) + 178.3 kJ → CaO(s) + CO₂(g)

• Endothermic

• Exothermic