Thermochemistry Calculations

What is the symbol for heat?

• q
• H
• J
• ∘C

Chemical reactions that absorb energy are called

• endothermic
• fast
• slow
• exothermic

Tags

NGSS.HS-PS1-4

Which of the following is used to calculate amount of heat absorbed/released?

• q = mcΔT

• H = ΔH x moles

• H = ΔH x grams

• products - reactants

Tags

NGSS.HS-PS3-1

In an endothermic reaction the system is releasing energy.

• True
• False

Tags

NGSS.HS-PS1-4

Exothermic reactions feel

• warm
• cold

Tags

NGSS.HS-PS1-4

Heat is measured in

• joules and calories

• grams

• degrees celcius

The variable C stands for what

• heat 
• mass
• specific heat
• change in temperature

A 500g piece of Aluminum has a temperature of 7 degrees. What is the heat energy produced?  Specific heat of Aluminum is .900 J/gC.

• 3000 J
• 3000 g
• 3150 J
• 3150 g

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-PS3-4

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