Tag: changes and their classification

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Multiple choice chemistry change around us physical changes changes and their classification physical changes

Dissolution of common salt or sugar in water is an example of:

  1. physical change

  2. chemical change

  3. both A and B

  4. none of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A change in which only the physical properties of the substance get changed, when the chemical composition remain unchanged is called a physical change. Here we can obtain the sugar by boiling water.

Multiple choice chemistry change around us physical changes changes and their classification physical changes
Example of the physical change is :

  1. respiration (inhaling oxygen gas and exhaling carbon dioxide gas)

  2. mixing vinegar and baking soda

  3. evaporating water

  4. burning fuel in your car
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In evaporation of water, only the physical state of water changes from liquid to gas, but not the chemical composition of water.

Hence the correct answer is option C.

Multiple choice chemistry change around us physical changes changes and their classification physical changes

Which of the following is a physical change?

  1. Magnetisation of iron

  2. Curdling of milk

  3. Burning of a candle

  4. Cooking of food
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Magnetization of iron is a physical change and not a chemical change as there is no change of state, no change of temperature, no smell and no evolution of gas. It is because: - No Chemical process is involved. - After demagnetizing the iron it will lose its magnetic power.

Multiple choice chemistry change around us physical changes changes and their classification physical changes

Which of the following is not a physical change?

  1. Tearing a paper

  2. Bending an iron rod

  3. Freezing water into ice

  4. Curdling of milk
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Tearing of paper is a physical change because it remains same. Tearing of a paper is a physical change because when the paper is torn only the appearance of the paper is changed and no new substance is formed.

Cheese is made when an enzyme called rennet is added to milk. The rennet causes a chemical reaction where the milk solids curdle, separating themselves from the whey, or liquid portion of the milk

Multiple choice chemistry change around us physical changes changes and their classification physical changes

Which one of the following is a reversible change?

  1. cutting wood in pieces

  2. blooming of flowers

  3. melting of ice

  4. the burning of a candle
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Melting of ice is a physical change in which substance changes its physical state but not properties.


 Hence it is a reversible change in which melted ice can freeze again by decrease in temperature.

Hence the option C is correct.

Multiple choice chemistry change around us physical changes changes and their classification physical changes

Properties such as shape, size, colour and state of a substance are called it's:

  1. chemical properties

  2. physical properties

  3. chemical changes

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Properties such as shape, size, colour and state of a substance are called its physical properties.A physical change is generally reversible. In such a change no new substance is formed.

Multiple choice chemistry change around us physical changes changes and their classification physical changes

Which of the following is a physical change?

  1. Rusting of Iron.

  2. The burning of coal

  3. Cooking food

  4. Converting ice in the water
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Change in the state between solid, liquid and gas is a physical change because Properties such as shape, size, colour and state of a substance are called its physical properties which are reversible.


Hence the option D is correct.