Free Printable 4.3 Specific Latent Heat

1.

There are four main processes in changing of phase, and they are

a)

Melting

b)

Boiling

c)

Condensation

d)

All the above

2.

Latent heat is

a)

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

b)

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

c)

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

d)

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

3.

The heat absorbed by melting a solid is known as

a)

latent heat of fusion

b)

latent heat of solid

c)

latent heat of liquid

d)

latent heat of vaporisation

4.

the symbol for specific latent heat is

a)

c

b)

$l$

c)

Q

d)

m

5.

What is the formula to calculate specific latent heat of vaporisation?

a)

$l=\frac{Q}{m}$

b)

c = Q/(mΔƟ)

c)

Q = mcΔƟ

d)

$Q=ml$

6.

The graph shows the cooling curve of a substance. At which stages the specific latent heat released?

a)

AB and CD

b)

BC and DE

c)

AB and EF

d)

BC and CD

7.

Calculate the energy absorbed by 30 g of 100 ⁰C water that is turned into 100 ⁰C.

a)

67 800 J

b)

6 7800 J

c)

678 J

d)

67.8 J

8.

How much energy is required to freeze 150 g of water?
$\left[l_v=2260000\ J\ kg^{-1};\ l_f=334000\ J\ kg^{-1}\right]$

a)

50 100 cal

b)

339 000 J

c)

339 000 cal

d)

50 100 J

9.

How much energy is required to melt down a 2000 g of mercury?(latent heat of fusion is 1.14 x $10^4$ J/kg)

a)

2.55 x $10^4$ J

b)

2.28 x $10^4$ J

c)

2,280 x $10^4$ J

d)

3.28 x $10^4$ J

10.

How much energy is required to change 2600 g of water at 100 $\degree$ C into steam temperature? (latent heat of vaporization is 2.26 x $10^6$ )

a)

Q = 5.9 X $10^6$ J

b)

M = 5.9 X $10^6$ J

c)

C = 5.9 X $10^6$ J

d)

$\Delta$ T = 5.9 X $10^6$ J

11.

The graph shows the cooling curve of a substance.
The specific latent heat released at stages?

a)

CD and FG

b)

DE and EF

c)

EF and FG

d)

DE and FG

12.

Consider the following temperature-time graph when a solid is heated. which part of the graph involves latent heat of vaporization?

a)

Part I

b)

Part II

c)

Part III

d)

Part IV

13.

What is the amount of heat energy needed to convert 600 g of water at 100 $\degree$ C to steam at 100 $\degree$ C at standard atmospheric pressure ? (Specific latent heat of vaporization of water = 2.26 $\times$ $10^6$ J $kg^{-1}$ )

a)

1.36 $\times$ $10^6$ J

b)

1.56 $\times$ $10^6$ J

c)

1.36 $\times$ $10^8$ J

d)

1.56 $\times$ $10^8$ J

4.3 Specific Latent Heat

Total questions: 13

Worksheet time: 8mins

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