Form 5 homework – Week 3

For each question please give reasons + show your working if necessary.

Day 1  Day 2  Day 3  Day 4  Day 5  Day 6

Day 1

Question 1

Which row described a chemical change?

A white square with black text AI-generated content may be incorrect.

Question 2

Which changes are physical changes?

  • Melting ice to form water

  • Burning hydrogen to form water

  • Adding sodium to water

  • Boiling water to form steam

 

  • I ​​ and II

  • I and IV

  • II and III

  • III and IV

Day 2

Question 1

Some information about gas X is listed.

  • It is not present in clean, dry air.

  • It is not a cause of respiratory problems.

  • It is responsible for global warming.

What is X?

  • Carbon dioxide

  • Carbon monoxide

  • Methane

  • Nitrogen dioxide

Question 2

A new planet has been discovered and its atmosphere has been analysed.

A circle with words and a white background AI-generated content may be incorrect.

The table shows the composition of its atmosphere.

A table with numbers and letters AI-generated content may be incorrect.

Which gases are present in the atmosphere of the planet in higher percentage than they are in the Earth’s atmosphere?

  • Carbon dioxide and oxygen

  • Carbon dioxide only

  • Nitrogen and oxygen

  • Nitrogen only

Day 3

Question 1

What is the approximate volume of nitrogen in 200 cm3​​ of air

  • 20 cm3

  • 40 cm3

  • 80 cm3

  • 160 cm3

Question 2

Some combustion reactions produce pollutant gases.

Which reactions produce a pollutant gas that is not present in clean air?

  • 2CH4 + 3O2​​ ​​ 2CO + 4H2O

  • 2H2​​ + O2​​ ​​ 2H2O

  • C + O2​​ ​​ CO2

  • N2​​ + O2​​ ​​ 2NO

 

  • I and III

  • I and IV

  • II and III

  • III and IV 

Day 4

Question 1

Catalytic converters in car exhausts change polluting gases into non-polluting gases.

Which statements about oxides of nitrogen and car engines are correct?

  • The nitrogen in oxides of nitrogen comes from compounds in gasoline.

  • The oxygen in oxides of nitrogen comes from the air in the car engine.

  • Catalytic converters convert oxides of nitrogen into nitrogen.

 

  • 1 and 2

  • 2 and 3

  • 2 only

  • 3

Question 2

Carbon monoxide is given out from the exhaust of vehicles that burn fossil ​​ fuels.

Which row shows why carbon monoxide is a pollutant?

 

Acidic

Toxic

A

No

No

B

No

Yes

C

Yes

No

D

Yes

YEs

 

Day 5

Question 1

The diagram shows experiments involving the rusting or iron.

A diagram of a tube with a tube and a tube with a tube with a tube with a tube with a tube with a tube with a tube with a tube with a tube with a tube with AI-generated content may be incorrect.

The following results were suggested.

  • In tube P, the iron nails rust.

  • In tube Q, the iron nails do not rust.

  • In tube R, the iron nails do not rust

Which results are correct?

  • 1 and 2 only

  • 1 and 3 only

  • 2 and 3 only

  • 1,2 and 3

Question 2

A man blows up a balloon.

What is the approximate compositions of his exhaled air in the balloon?

A table with numbers and letters AI-generated content may be incorrect.

Day 6

Question 1

Dry air is passed over hot copper until all the oxygen has reacted.

The volume of gas at the end of the reaction is 120 cm3.

What is the starting volume of dry air?

  • 132 cm3

  • 150 cm3

  • 180 cm3

  • 600 cm3

Question 2

The table gives the composition of four newly discovered planets.​​ 

A white background with black text AI-generated content may be incorrect.

On which planets is the greenhouse effect likely to occur?

  • W only

  • W, X and Z

  • W and Y only

  • W, Y and Z