Factors Effecting a Chemical Change

Q.

Define the following terms.

Non-periodic change

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

a) physical
b) chemical
c) periodic
d) non-periodic

Q.

There is a change in energy when sugar is dissolved in water.

1. True
2. False

Q.

What is non-periodic change?

Q. Which of the following metals do not undergo corrosion?

1. Iron
2. Gold
3. Copper
4. Silver

Q.

Which of the following is a chemical change?

1. Cooking of vegetables
2. Cutting of fruits
3. Boiling of water
4. Melting of solids

Q. Which of the following change is a non-periodic change? [1 mark]

a. Stretching of a spring

b. Revolution of the Earth around the sun

c. Rusting of iron articles

d. Sunrise

Q. If we suspend a weight using a spring, it stretches.

What kind of changes are involved in this process?

1. Man-made
2. Reversible
3. Irreversible
4. Natural

Q. Which of the following are natural changes?

1. Deforestation
2. Air pollution
3. Thunderstorms
4. Floods

Q. Stretching of rubber to increase its size is a _________ change.

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

Q. Which of the following changes falls in the category of chemical change?

1. Cooking of food
2. Making ice cream
3. Boiling water
4. Melting iron

Q. Which among the following transformation falls under the category of natural change?

1. Clay into pot
2. Caterpillar to butterfly
3. Chicken to chicken curry
4. Wheat grains into flour

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. A sheet of paper is used to make a paper boat. Identify the changes involved in this.

1. Natural
2. Man-made
3. Temporary
4. Permanent

Q. Heating or applying force cannot cause any change in a substance.

1. True
2. False