Retake Practice Thermochemistry

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

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

In an endothermic reaction the system is releasing energy.

• True
• False

In an exothermic process, the surroundings are are gaining energy.

• True
• False

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

What letter represents boiling?

• B
• C
• D
• E

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5

What letter represents a liquid being heated?

• A
• B
• C
• D

Tags

NGSS.HS-PS1-5

NGSS.HS-PS3-4

Calculate the heat transferred when 440 g of water cools from 87.2°C to 50.0°C. (C = 4.18 J/g°C)

• 68000 J

• 2.83 J

• -2.83 J

• -68000 J

Tags

NGSS.HS-PS3-4

The flat parts on a heating curve represent

• phase changes

• temperature changes

The type of reaction that absorbs heat from the surroundings

• endothermic

• exothermic

• thermochemical

• chemical

Tags

NGSS.HS-PS1-4

The type of reaction that releases heat to the surroundings

• endothermic

• exothermic

• thermochemical

• chemical