Physical or chemical change? (a) a piece of copper is hammered to a different shape. (b) frost is formed when solid surfaces are cooled to below the dew point. (c) microorganisms decompose nitrate from the soil to form nitrogen gas. (d) as air temperature rises, its ability to hold water vapor increases significantly. (e) nitrous oxide is produced by the combustion of gasoline in industrial processes. (f) with the of sunlight, photosynthesis produces oxygen when carbon dioxide and water are chemically converted into glucose.

a) Physical change

b) Physical change

c) Chemical change

d) Physical change

e) Chemical change

f) Chemical change

Explanation:

Physical Change:

Type of change in which no new substance is formed, only change in shape or physical state is occur. Physical change can be reversed by reversing the condition.

Chemical Change:

A type of change in which new substance is formed and the change occured cannot be reversed.

A) A piece of copper is hammered to a different shape. Physical change

In this change, only shape of copper is changed.

(b) Frost is formed when solid surfaces are cooled to below the dew point. Physical change

Here, water vapour are changed to ice, i.e. change in physical state.

(c) Microorganisms decompose nitrate from the soil to form nitrogen gas. Chemical change

In this change, a new substance is formed.

(d) As air temperature rises, its ability to hold water vapor increases significantly. Physical change

No new substance is formed.

(e) Nitrous oxide is produced by the combustion of gasoline in industrial processes. Chemical change

New substance, nitrous oxide is produced.

(f) With the help of sunlight, photosynthesis produces oxygen when carbon dioxide and water are chemically converted into glucose. Chemical change

New substances are formed in this change.

answer: the rock sample is a sedimentary rock.

explanation:

it is given that:

mass of rock sample, m = 2.7 g

volume of rock sample,

so, density of rock sample will be

since, the density of rock sample is . hence, the rock sample is a sedimentary rock, whose densities varies between .