C2.3 Metals and Acids

Question 1

Name a metal that reacts more vigorously in oxygen than aluminium

Answer 1

potassium

sodium

calcium

magnesium

Question 2

Name a metal that reacts less vigorously in air than lead

Answer 2

copper

silver

gold

platinum

Question 3

Finish the following equation

magnesium + hydrochloric acid –>

Answer 3

magnesium chloride + hydrogen

Question 4

Finish the following reaction

Magnesium + oxygen –>

Answer 4

Magnesium oxide

Question 5

Finish the following word equation

magnesium + sulphuric acid –>

Answer 5

magnesium sulphate + hydrogen

Question 6

Finish the following symbol equation for the reaction of zinc and hydrochloric acid

Zn + ____ –> ZnCl₂ + ____

Answer 6

Zn + 2HCl –> ZnCl₂ + H₂

Question 7

Predict whether the following would react explaining your reason.

Finish the equation if it reacts

Magnesium chloride + Zinc –>

Answer 7

Doesn’t react

as magnesium is more reactive than zinc

Question 8

Predict whether the following would react explaining your reason.

Finish the equation if it reacts

Magnesium chloride + Zinc –>

Answer 8

Doesn’t react

as magnesium is more reactive than zinc

Question 9

Predict whether the following would react explaining your reason.

Finish the equation if it reacts

Zn(NO₃)₂ + Mg –>

Answer 9

Reacts as magnesium is more reactive than zinc

–> Mg(NO₃)₂ + Zn

Question 10

Predict whether the following would react explaining your reason.

Finish the equation if it reacts

Copper nitrate + iron

Answer 10

Reacts as iron is more reactive than copper

–> iron nitrate + copper

Question 11

Predict whether the following would react explaining your reason.

Finish the equation if it reacts

Copper nitrate + iron

Answer 11

Reacts as iron is more reactive than copper

–> iron nitrate + copper

Question 12

Predict whether the following would react explaining your reason.

Finish the equation if it reacts

Zinc chloride + calcium –>

Answer 12

Reacts as calcium is more reactive than zinc

–> Zinc + calcium chloride

Question 13

Predict whether the following would react explaining your reason.

Finish the equation if it reacts

Zinc chloride + calcium –>

Answer 13

Reacts as calcium is more reactive than zinc

–> Zinc + calcium chloride

Question 14

What is a displacement reaction?

Answer 14

When a more reactive element replaces a less reactive element in a compound

Question 15

Explain why copper can be extracted from its ore with carbon

Answer 15

as carbon is more reactive than copper

Question 16

Write a symbol equation for the reduction of copper oxide with carbon

Answer 16

CuO + C –> Cu + CO

Question 17

A 150g sample of copper ore contains 15g of copper. Calculate the percentage of copper in the ore.

Answer 17

15 ÷ 150 x 100

= 10%

Question 18

Describe the test for hydrogen gas

Answer 18

Light the gas with a lit spill

it makes a squeaky pop

Question 19

What does it mean if a material is strong?

Answer 19

Requires a lot of force to break it

Question 20

What does it mean if a material is hard?

Answer 20

Isn’t scratched easily

Question 21

What does it mean if a material is flexible?

Answer 21

Bends easily

Question 22

What does it mean if a material is brittle?

Answer 22

Breaks easily when bent

Question 23

What does it mean if a material is transparent?

Answer 23

See through