Thermochemistry Q=mc(delta)T

What is the specific heat of an alloy if 4210 joules are required to raise the temperature of a 30 g sample by 180°C?

• 0.78 J/g°C

• 0.25 J/g°C

• 1.78 J/g°C

• 2.34 J/g°C

Tags

NGSS.HS-PS3-4

How much heat is needed to raise the temperature of 50 g of iron by 15°C? (specific heat of iron = 0.444 J/g°C)

• 333 J

• 33.3 J

• 33300 J

• 3330 J

An alloy has a specific heat of 1.25 cal/g°C and is at 25 °C. When it is dropped into warm water, the alloy absorbs 750 cal of heat. If the final temperature of the alloy is 75 °C, what is its mass?

• 12 g

• 2.4 g

• 24 g

• 36 g

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

The specific heat of gold is 0.129 J/g°C. How many joules of energy are needed to warm 4.5 g of gold from 25.0°C to 100°C?

• 43.5 J

• 53.4 J

• 2.42 J

• 783 J

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

Is melting endothermic or exothermic?

• endothermic

• exothermic

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Is freezing endothermic or exothermic?

• endothermic

• exothermic

Tags

NGSS.HS-PS3-4

Is vaporizing endothermic or exothermic?

• endothermic

• exothermic

Is condensation endothermic or exothermic?

• endothermic

• exothermic

Tags

NGSS.HS-PS3-4

How is temperature effected in a state change?

• it remains constant

• it fluctuates

• it depends on the substance

• it depends on the state change

Tags

NGSS.MS-PS1-4

What happens to average kinetic energy as the temperature increases?

• it increases

• it decreases

• it remains the same

Tags

NGSS.HS-PS3-2