Latent heat and Specific heat Capacity

What is specific heat capacity?

• The power needed to raise the temperature of 1 kg of a substance by 1^oC.

• The energy needed to raise the temperature of 1 kg of a substance by 1^oC.

• The temperature increase of 1 kg of a substance when it is heated for 1 minute.

• The mass of a substance whose temperature will increase by 1^oC when heated for 1 minute.

Tags

NGSS.MS-PS3-4

Water has specific heat capacity of 4180 J/kg^oC and Lead has specific heat capacity 128 J/kg^oC. Assume 1 kg of water and 1 kg of Lead are at 50^oC. Which material would take longer to cool down to room temperature?

• Water

• Lead

• Both would cool down at same rate

• Impossible to tell

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Why are lines B and D flat?

• The ice is melting

• The ice is freezing

• All of the thermal energy is used to break the bonds

• They stopped the stopwatch

• They stopped heating the ice.

Tags

NGSS.MS-PS1-4

Select the state changes that latent heat of fusion applies to.

• melting

• evaporating

• freezing

• condensing

• sublimation

Tags

NGSS.MS-PS1-4

The diagram shows a heating curve for ice. Which line represents the ice melting?

• A

• B

• C

• D

• E

Tags

NGSS.MS-PS1-4

If 5.0 x 10⁵ J of energy is absorbed by a block of ice when it is heated from -5^oC to 0^oC, find the mass of the ice.

Given that the specific heat capacity of ice is 2.05 x 10³ J kg^{-1 o}C^-1 and the specific latent heat of fusion of ice is 3.34 x 10⁵ J kg^-1.

• 1.45 kg

• 2.56 kg

• 3.01 kg

• 3.27 kg

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

20 g of water. specific heat of water is 4.18 J/g°C. temperature changes from 25° C to 20° C, how much heat energy (Q) moves from the water to the surroundings?

• 418 J

• 209 J

• 83 J

• 4.18 J

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

The specific heat of platinum is 0.133 J/g°C. How much heat(Q) is released when a 10 g piece of platinum cools from 100°C to 50°C?

• 66.5 J

• 665 J

• 0.0266 J

• 0.665 J

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Latent heat is

• the heat absorbed or released at a boiling process during a change of phase

• the heat absorbed or released at a constant temperature during a change of phase

• the heat absorbed or released at a constant temperature during a change of phase of 1 kg object

• the heat absorbed or released by an object to increase or decrease its temperature by 1 degree Celcius

Tags

NGSS.MS-PS1-4

What is the equation used to calculate specific heat capacity?

• Change in thermal energy = mass * specific heat capacity * temperature change

• Change in thermal energy = mass / specific heat capacity * temperature change

• Change in thermal energy = mass * specific heat capacity / temperature change

• Change in thermal energy = mass * temperature change / specific heat capacity

Tags

NGSS.MS-PS3-4