Explain the term boiling point ?
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[1 Mark Question Answer]
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26 Q→05MCQ
5 Q→06fill in the blanks.
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Calorimetry questions
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Explain the term boiling ?
How does the average kinetic energy ?
A substance changes from its solid state to the liquid state when heat is supplied to it
How does the average kinetic energy of the molecules of the substance change.
Which has more heat: 1 g ice at 0℃ or 1g water 0℃? Give reason.
$1 \ kg$ of ice at $0^o$ is heated at constant rate and its temperature is recorded after every $30$ s till steam is formed at $100^o C.$ Draw a temperature time graph to represent the change of phase.
View full solution →The diagram in Fig $11.12$ below shows the change of phase of a substance on a temperature time graph.
(a) What do the parts $AB, BC, CD$ and $DE$ represent?
(b) what is the melting points of the substance?
(c) what is the boiling points of the substance?
View full solution →(a) What do the parts $AB, BC, CD$ and $DE$ represent?
(b) what is the melting points of the substance?
(c) what is the boiling points of the substance?
State the effect of increase of pressure on the melting point of ice.
State the effect of presence of impurity on the melting point of ice. Give one use of it.
A substance undergoes (i) a change in its temperature, (ii) a change in its phase without change in its temperature. In each case, state the change in energy of molecules of the substance.
A molten metal of mass $150 g$ is kept at its melting point $800^{\circ} C$. When it is allowed to freeze at the same temperature, it gives out $75,000 J$ of heat energy.
(a) What is the specific latent heat of the metal?
(b) If the specific heat capacity of metal is $200 Jkg ^{-1} K ^{-1}$, how much additional heat energy will the metal give out in cooling to $-50^{\circ} C$ ?
View full solution →(a) What is the specific latent heat of the metal?
(b) If the specific heat capacity of metal is $200 Jkg ^{-1} K ^{-1}$, how much additional heat energy will the metal give out in cooling to $-50^{\circ} C$ ?
Explain the following:
The surrounding become pleasantly warm when water in a lake starts freezing in cold countries ?
Why do bottled soft drinks get cooled, more quickly by the ice cubes than by the iced water, both at 0℃?
Ice cream appears coder to the mouth than water at 0℃. Give reason.
Water boils at 120 °C in a pressure cooker. Explain the reason
$2 kg$ of ice melts when water at $100^{\circ} C$ is poured in a hole drilled in a block of ice. What mass of
water was used? Given: Specific heat capacity of water $=$ $4200 Jkg ^{-1} K ^{-1}$, Lice $=336 \times 10^3 Jkg ^{-1}$.
View full solution →water was used? Given: Specific heat capacity of water $=$ $4200 Jkg ^{-1} K ^{-1}$, Lice $=336 \times 10^3 Jkg ^{-1}$.
$250 g$ of water at $30^{\circ} C$ is contained in a copper vessel of mass $50 g$.
Calculate the mass of ice
required to bring down the temperature of the vessel and its contents to $5^{\circ} C$. Given: specific
latent heat of fusion of ice $=336 \times 10^3 Jkg ^{-1}$, specific heat capacity of copper $=400 Jkg ^{-1} K ^{-1}$,
specific heat capacity of water $=4200 Jkg ^{-1} K ^{-1}$
View full solution →Calculate the mass of ice
required to bring down the temperature of the vessel and its contents to $5^{\circ} C$. Given: specific
latent heat of fusion of ice $=336 \times 10^3 Jkg ^{-1}$, specific heat capacity of copper $=400 Jkg ^{-1} K ^{-1}$,
specific heat capacity of water $=4200 Jkg ^{-1} K ^{-1}$
A piece of ice of mass $40 g$ is added to $200 g$ of water at $50^{\circ} C$ Calculate the final temperature of water when all the ice has melted. Specific heat capacity of water = $4200 Jkg ^{-1} K ^{-1}$, and specific latent heat of fusion of ice $=$ $336 \times 10^3 Jkg ^{-1}$.
Find the result of mixing $10 g$ of ice at $-10^{\circ} C$ with $10 g$ of water at $10^{\circ} C$. Specific heat capacity
of ice $=2.1 Jkg ^{-1} K ^{-1}$, Specific latent heat of ice $=336 Jg ^{-1}$ and specific heat capacity of water
$
=4.2 Jkg ^{-1} K ^{-1}
$
View full solution →of ice $=2.1 Jkg ^{-1} K ^{-1}$, Specific latent heat of ice $=336 Jg ^{-1}$ and specific heat capacity of water
$
=4.2 Jkg ^{-1} K ^{-1}
$
In an experiment, $17 g$ of ice is used to bring down the temperature of $40 g$ of water at $34^{\circ} C$ to its freezing temperature. The specific heat capacity of water is $4.2 Jkg ^{-1} K ^{-1}$. Calculate the specific latent heat of ice. State one important assumption made in the above calculation.
View full solution →The specific latent heat of fusion of water is
- ✓$80 cal g ^{-1}$
- B$2260 J g ^{-1}$
- C$80 Jg g ^{-1}$
- D$336 J kg ^{-1}$
Answer: A.
View full solution →The S.I. unit of specific latent heat is:
- A$cal g ^{-1}$
- B$cal g ^{-1} K^{-1}$
- ✓$Jkg ^{-1}$
- D$Jkg ^{-1} K^{-1}$
Answer: C.
View full solution →The specific heat capacity of water is :
- ✓$4200 J kg ^{-1 K-1}$
- B$420 J g ^{-1} K^{-1}$
- C$0.42 Jg ^{-1} K^{-1}$
- D$4.2 Jkg ^{-1} K^{-1}$
Answer: A.
View full solution →The S.I. unit of specific heat capacity is :
- A$Jkg ^{-1}$
- B$JK ^{-1}$
- ✓$Jkg ^{-1} K^{-1}$
- Dkilocal $kg ^{-10} C ^{-1}$
Answer: C.
View full solution →The S.I. unit of heat capacity is :
- A$Jkg ^{-1}$
- ✓$JK ^{-1}$
- C$Jkg ^{-1} K^{-1}$
- D$cal ^0 C ^{-1}$
Answer: B.
View full solution →Complete the following sentence :
water can be made to boil at 115°C by ................. pressure over its surface.
Complete the following sentence :
The boiling point of water is defined as _________
Complete the following sentence:
A pressure cooker is based on the principle that boiling point of water increases with the _________
Complete the following sentence:
Increase in pressure _________ the boiling point of water.
Complete the following sentence:
Decrease in pressure over ice ________ its melting point.
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