Anomalous Expansion of Water

Q. Question 1
The mass per unit volume of a substance is called density (density = mass/volume). Arrange the following in order of increasing density - air, exhaust from chimney, honey, water, chalk, cotton, and iron.

Q.

A substance which dissolves in water or any other liquid is called .

Q.

When water is converted to ice, its volume ___ and density ____.

1. decreases, increases

2. increases, decreases

3. increases, increases

4. decreases, decreases

Q.

The density of iron is more than that of cotton.

Q.

How does fishes and aquatic animals survive when the pond gets covered with thick ice ?

Q.

The substance that dissolves in the solvent is called the solute.

1. True
2. False

Q.

2. How do aquatic animals survive in winter or in cold countries?

Q.

How is aquatic life benefited from the fact that water has a maximum density of 4°C?

Q.

A block of metal has a mass of $624kg$ and a volume of $80m^3$. What is the density of the metal?

Q. The temperature range in which water shows anomalous behaviour is:

1. 1 to 4 degree celsius
2. -1 to -4 degree celsius
3. 0 to 4 degree celsius
4. 0 to -4 degree celsius

Q. When salt is added to water, then:

1. Salt is the solvent
2. Salt is the solute
3. Water is the solute
4. Neither water nor salt are the solute

Q. which state of matter has maximum density-solid or BEC

Q.

____ tells us how closely packed the matter is in an object.

Q. Choose the correct option:

1. only 2 is true
2. both are false
3. both are true
4. only 1 is true

Q. Question 5 (b)
What is the physical state of water at— $\left(b\right)0^{\circ }C$

Q. Why water has maximum density at 4 degree celsius?

Q.

In sugar and water solution, sugar acts as a ________.

Q. Question 20
A glass tumbler containing hot water is kept in the freezer compartment of refrigerator (temperature < $0^{\circ }$C). If you could measure the temperature of the content of the tumbler, which of the following graphs (Fig.1.2) would correctly represent the change in its temperature as a function of time.

Q. Explain why density of water is maximum at 4°C

Q.

How is aquatic life benefitted by the fact that water has the maximum density at $4^{\circ }C$?

Q.

Define solute and give one example.

Q.

How does the density of water change when :
(a) It is heated from $0°Cto4°C.$
(b) It is heated from $4°Cto10°C?$

Q.

What do you understand by the following term: Solute

Q.

Q1. Liquid have generally have lower density as compared to solids. But you must have observed that ice floats on water. Find out why?

Q. In cold countries, water pipes sometimes burst, because

Q.

Among mercury, iron, copper, and aluminum, mercury has the highest density.

1. True
2. False

Q. The density of milk is 1.04 $g/c{m}^3$ Therefore $1c{m}^3$ of milk has a mass of ______ g.

1. $1.04$
2. $2.08$
3. $3.12$
4. $4.16$

Q. The ............... of water is defined as the constant temperature at which water changes to steam.

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

Q. The density of water is maximum at ____${}^{\circ }$ C.

1. 4

Q.

Describe the factors on which the density of a substance depends.