Physical and Chemical Changes

A change in which a substance undergoes changes in its physical properties is called _____.

• chemical change

• physical change

• irreversible change

• biological change

Tags

NGSS.MS-PS1-4

Browning of an apple after it is cut is an example of ____.

• physical change

• chemical change

• reversible change

• biological change

Tags

NGSS.MS-PS1-2

When Magnesium ribbon is burnt in oxygen, the product obtained is ___.

• Magnesium chloride

• Magnesium sulphate

• Magnesium carbide

• Magnesium oxide

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

When Magnesium ribbon is ignited using a candle flame, it burns with a __________.

• sparkling red light

• dull yellow light

• bright green light

• brilliant white light

Tags

NGSS.MS-PS1-2

Which of the following is a physical change?

• Rusting of iron

• Melting of wax

• Burning of coal

• Curdling of milk

Tags

NGSS.MS-PS1-4

Which of the following is a chemical change?

• Twinkling of stars

• Cutting of fruits

• Cooking of vegetables

• Boling of water

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A chemical change may involve ____________.

• change in color only

• change in temperature only

• evolution of gas only

• all of the above

Tags

NGSS.MS-PS1-2

Which of the following is/are true when milk changes to curd?

(i) Its state is changed from liquid to semi solid

(ii) It changes color

(iii) It changes taste

(iv) The change cannot be reversed.

Choose the correct option from the ones given below:

• (i) and (ii) are correct

• (ii) and (iii) are correct

• (i), (iii) and (iv) are correct

• All are correct

Tags

NGSS.MS-LS1-7

NGSS.MS-PS1-2

Which of the following is incorrect for a chemical reaction?

• Heat may be given out but never absorbed

• Sound may be produced

• A color change may take place

• A gas may be evolved

Tags

NGSS.MS-PS1-2

Which of the following is false?

• When a candle burns, both physical and chemical changes take place.

• Stretching of a rubber band is not a physical change

• Melting of ice is a physical change

• Dissolving common salt in water is not a chemical change

Tags

NGSS.MS-PS1-2