Thermochemistry

What are the two units for Heat?

• cal and joules
• cal and grams
• joules and celcius
• there is only one

energy in endothermic reactions are

• released
• ended
• absorbed

Tags

NGSS.HS-PS1-4

energy in exothermic reactions are

• released
• absorbed

Tags

NGSS.HS-PS1-4

Heat flows from _______ to ______ objects

• cooler to warmer
• warmer to warmer
• warmer to cooler
• cooler to cooler

Tags

NGSS.HS-PS3-4

Heat is measured in 

• joules
• grams
• degrees celcius

q stands for which variable

• heat
• mass
• specific heat
• change in temperature

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

The variable C stands for what

• heat 
• mass
• specific heat
• change in temperature

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

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

• g /J C
• °C/g J
• kJ/g
• J/g°C

A sample of iron receives 50.J of heat energy that raises the temperature of the iron 25.0°C. If iron has a specific heat of .10 J/g°C, what is the mass of the iron sample?

• 25g
• 30g
• 20g
• 50g

Tags

NGSS.HS-PS3-1

If 238 J of heat is absorbed by a sample of metal with a mass of 40.7 g, and it raises the temperature from 20.0°C to 32.4°C, what is the specific heat capacity of the metal? (show your work)

• 2.34 J/g°C
• 0.472 J/g°C
• 6.13 J/g°C
• 0.163 J/g°C

Tags

NGSS.HS-PS3-4