Homogeneous Mixture

Q.

Which of the following are physical changes?
(i) Melting of iron metal
(ii) Rusting of iron
(iii) Bending of an iron rod
(iv) Drawing a wire of iron metal

1. (i), (ii) and (iii)

2. (i), (ii) and (iv)
   

3. (ii), (iii) and (iv)

4. (i), (iii) and (iv)

Q.

A solution contains 40 g of common salt in 320 g of water. What is the concentration in terms of mass by the mass percentage of the solution?

1. 10.05%

2. 11.05%

3. 11.11%

4. 11.15%

Q.

What is the smallest particle of a compound?

Q. Salt solution is an example of:

1. Homogeneous mixture
2. Heterogeneous mixture and impure substance
3. Impure substance
4. Homogeneous mixture and impure substance

Q.

What is the chemical name for Milk.

Q.

Give the five most common elements.

Q.

Beating aluminium to make Aluminium foil is a physical or chemical change?

Q. A change that cannot be reversed is called ________ change, while the change which can be reversed is called _______ change.

1. slow, fast
2. permanent, temporary
3. natural, man-made
4. natural, permanent

Q.

Muddy water is a heterogeneous mixture. Why?

Q.

Brass is an example of a

Q.

What is a solution? Give its three properties.

Q.

Why are most physical changes reversible?

Q.

Give one example each of a homogeneous and a heterogeneous mixture.

Q.

Tick the correct options: burning of coal is a/an................ change.

1. reversible

2. irreversible

3. natural

4. human - made

Q. Types of mixtures. Homogeneous and heterogeneous mixtures

Q. Which of the following is an irreversible change?

1. Melting of ice cream
2. Formation of curd
3. Folding of paper
4. Melting of ice

Q.

What is the other name for impure substances? Give two examples of impure substances.

Q.

Which of the following are pure substances?
(i) Soda water

(ii) Blood

(iii) Liquid mercury

(iv) Chalk

1. (i), (iii) and (iv)

2. (iii) and (iv)

3. (i) and (iv)

4. (iv) only

Q.

Give one example of liquid and liquid (homogenous) mixtures.

Q. Freezing of water is an example of ________ change.

1. physical
2. chemical
3. permanent
4. irreversible

Q. Changes which repeat after regular interval of time are called ________.

1. physical changes
2. chemical changes
3. periodic changes
4. non-periodic changes

Q.

Which of the following substances, when mixed with water, doesn't leave a residue when passed through a filter paper?

1. Charcoal powder

2. Chalk powder

3. Blue vitriol

4. Talcum Powder

Q.

Mixtures of red chili powder in water, butter in water, petrol in water, and honey in water were given to Radha, Sudha, Sofia, and Raveena, respectively. Whose mixture is in solution form?

Q.

Define heterogeneous mixture?

Q.

What weight of sulfur is present in 47.5 g ${\mathrm{CS}}_2$

Q.

Write the difference between Homogeneous and Heterogeneous mixture

Q.

Name the constituents of:

(b) Duralumin

Q. Define isotropy and anisotropy

Q. Which property of clay is useful for making pots and bricks?

1. Non-magnetic nature
2. Thermal conductivity
3. Opacity
4. Malleability

Q.

Name the following

Two metals that form Bronze.