3.7 Heat Calculations

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-PS3-4

NGSS.HS-PS1-5

What type of reaction is pictured behind?

• endothermic
• exothermic

Tags

NGSS.HS-PS3-4

NGSS.HS-PS1-4

What  is the formula to calculate heat energy required to raise the temperature of any substance?

• Q=mc∆t
• Q=mc
• Q= ½mv
• m=QC

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

20 g of water (specific heat = 4.18 J/gx°C) change from 25° C to 20° C. How much heat energy is lost by the water?

• 418 Joules

• 209 J

• 83 J

• 4.18 J

If the specific heat of water is 4.184 J/g∙°C, how much heat is required to increase the temperature of 1.2 g of water from 23 °C to 39 °C?

• -80,371.2 J

• 44,938.6 J

• 80. J

• 112,575.9 J

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

A high specific heat means...

• It heats up quickly with energy added
• It requires more energy to change temperature

A pot of 2400g of water at a temperature of 25˚C is heated on a stove until the water boils (100˚C).  The specific heat of water is 4.18 J/(g˚C).
Determine the heat energy needed to heat the water in the pot to boiling.

• 133.76J
• 43,062.2J
• 752,400J
• 1,003,200J

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

The temperature of an unknown piece of metal with a mass of 30.00 g changes from 25.0 °C to 35.0 °C when the metal absorbs 350.0 J of energy. What is the specific heat of the metal?

• 1.17 J/g°C
• -1.17 J/g°C
• 0.857 J/g°C
• -0.857 J/g°C

Tags

NGSS.HS-PS3-1

The specific heat(c) of copper is 0.39 J/g °C. What is the temperature change(∆t) when 100 Joules of heat(Q) is added to 20 grams?

• 12.82 °C

• 24.12°C

• 1.95 °C

• 5128 °C

Tags

NGSS.HS-PS3-1