Boiling Point

Q.

The boiling point of alcohol is ${78}^{\circ }$C. What is this temperature on Kelvin scale?

Q.

What temperature does water boil?

Q.

Particles in water at 0°c have more energy as compared to particles in ince at the same temperature.why?

Q.

The freezing point of water on the kelvin scale is

Q.

What is boiling? Define the boiling point of a substance.

Q.

What produces more severe burns boiling water or steam?

Q.

Define 'boiling point' of a substance ? What is the boiling point of water ?

Q.

At what temperature solid ice and liquid water coexist ?

Q.

Why does steam at 100 degrees celsius cause more severe burns than boiling water at 100 degrees celsius ?

Q.

Why does water at 0 c have more energy than ice at the same temperature? Explain your answer in terms of latent heat of vaporization

Q.

Eggs can be made to boil faster in salt water than in pure water. Explain.

Q. Addition of solid non-volatile impurities in a liquid

1. decreases its boiling point
2. increases its boiling point
3. does not affect its boiling point
4. first decreases then increases its boiling point

Q.

Is the melting point temperature of the solid state and the freezing point of temperature of the liquid state of the substance different ?give reason to support your answer.

Q.

If you were to make a very sensitive glass thermometer, then which of the following working liquids would you choose?

1. Mercury

2. Gasoline

3. Alcohol

4. Glycerine

Q.

What is the significance of boiling point?

Q. If the boiling point of water in Kelvin scale is 373 K. What is the boiling point of water on degree celcilus scale(${}^o$C)?

1. 473${}^o$C
2. 173${}^o$C
3. 100${}^o$C
4. 73${}^o$C

Q.

What produces more severe burns, boiling water or steam?
Now explain in which physical state out of the two will the particles have more energy? [3 MARKS]

Q.

Why does water become cold if we add some ice cubes in it?

Q.

Give reason :the latent heat of vaporisation of steam is more than that of boiling point .explain

Q.

The boiling point of water is 80 °C.

1. True
2. False

Q.

Why is pumice stone placed usedin the beaker

tofind the boiling point of water

Q. Question 2 (a)
What is the physical state of water at:
$a.{250}^{\circ }C$

Q.

I don't understand how melting point = freezing point.

For example, if liquid water freezes at 0 °C how can ice also melts at 0 °C?

Q. Question 11
A sample of water under study was found to boil at 102${}^{\circ }$C at normal temperature and pressure. Is the water pure? Will this water freeze at 0${}^{\circ }$C? Comment.

Q.

Write true or false for the following statement:
“Tap water does not contain dissolved impurities.”

1. True
2. False

Q.

The temperature at which the pressure of the molecules becomes equal to the atmospheric pressure is called?

Q. What is the boiling point of water on Kelvin scale?

1. 0 K
2. 100 K
3. 273 K
4. 373 K

Q.

Steam coming out of pressure cooker are invisible till a certain radial distance is reached. Why?

1. Vapour is invisible

2. Steam particles carry huge kinetic energy

3. Steam particles carry huge potential

4. Steam particles disappear fast

Q. The temperature at which water gets converted to steam is known as its .

1. freezing point
2. melting point
3. boiling point

Q.

define melting point ?