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Reactive Metals with Oxygen and Acids

In this worksheet, students will look at the question 'How does the reactivity of metals affect how they react with acids and oxygen?' Hold onto your hats, this one may be explosive!

'Reactive Metals with Oxygen and Acids' worksheet

Key stage:  KS 3

Curriculum topic:  Chemistry: Chemical Reactions

Curriculum subtopic:  Reactions of Acids with Metals

Difficulty level:  

down

Worksheet Overview

QUESTION 1 of 10

The REACTIVITY SERIES lists all the elements in order of reactivity from the most to the least reactive:

 

 

This table allows us to predict how metals will react with substances such as acids and oxygen. 

 

Metals and Acids

 

All the metals below hydrogen in the reactivity series don't react with acids, so lets concentrate on the more reactive metals.

 

When a metal such as magnesium is placed in acid, salt and hydrogen gas are produced, along with heat. A reaction that releases heat is known as an exothermic reaction.

 

magnesium + hydrochloric acid   magnesium chloride + hydrogen

 

This experiment can be performed in the school lab, but it is not advised to try more reactive metals such as sodium and potassium as they are so reactive that they may explode. They will certainly produce lots of heat.

 

Metals and Oxygen

 

As before, the unreactive metals (like gold) will not react with oxygen even when heated; however, metals such as magnesium react with oxygen to produce metal oxides. The reaction of magnesium with oxygen is commonly performed in the school lab and produces a very bright, white light with lots of smoke.

 

Firework

The reaction of magnesium and oxygen is used in fireworks.

 

More reactive metals, such as sodium, burn to release a lot of heat and unusual flame colours.

 

Sodium, for example, burns with a very bright yellow flame:

 

Sodium burning

 

Potassium burns with a lilac flame:

 

Potassium burning

 

See whether you can use that information together with what you have already learned as you tackle this activity.

Which of the following is released during an exothermic reaction?

gas

heat

water

salt

Which of the following metals would not react with sulfuric acid?

magnesium

zinc

silver

potassium

Complete the following equation by typing the name of the missing chemical in the text box below.

 

_________________ + hydrochloric acidpotassium chloride + hydrogen

Complete the following equation by typing the name of the missing chemical in the text box below.

 

magnesium + __________ magnesium oxide

Which of the following metals burns with a lilac flame?

sodium

potassium

copper

lithium

Place the metals in the correct order of reactivity by comparing their reactivity to copper.

 

Column A

Column B

potassium
more reactive
zinc
less reactive
lithium
more reactive
silver
less reactive
gold
more reactive

Place the metals in the correct order of reactivity by comparing their reactivity to aluminium.

 

Column A

Column B

potassium
more reactive
zinc
less reactive
lithium
less reactive
magnesium
more reactive
iron
more reactive

What are the two substances produced when a metal reacts with an acid?

hydrogen

salt

water

metal oxide

What is the name of the compound produced when calcium metal is burned in air?

What is the name of the salt produced when sodium metal reacts with sufuric acid?

  • Question 1

Which of the following is released during an exothermic reaction?

CORRECT ANSWER
heat
EDDIE SAYS
Exothermic reactions specifically involve the release of heat energy. Remember: EX = "out of "and THERM = "heat", so EXOTHERMIC = "heat out of it".
  • Question 2

Which of the following metals would not react with sulfuric acid?

CORRECT ANSWER
silver
EDDIE SAYS
All the metals above hydrogen in the reactivity series react with acids. Have another look here:
  • Question 3

Complete the following equation by typing the name of the missing chemical in the text box below.

 

_________________ + hydrochloric acidpotassium chloride + hydrogen

CORRECT ANSWER
potassium
EDDIE SAYS
The salt name contains the name of the metal that was used in this reaction, so as you can see potassium chloride must contain the metal ... potassium!
  • Question 4

Complete the following equation by typing the name of the missing chemical in the text box below.

 

magnesium + __________ magnesium oxide

CORRECT ANSWER
oxygen
EDDIE SAYS
The salt name contains the name of the substance that the magnesium reacted with - oxygen.
  • Question 5

Which of the following metals burns with a lilac flame?

CORRECT ANSWER
potassium
EDDIE SAYS
Potassium burns with a distinctive lilac flame. It is used in fireworks because of this. Many metals burn with distinctive flame colours and it is one way in which they can be identified.
  • Question 6

Place the metals in the correct order of reactivity by comparing their reactivity to copper.

 

CORRECT ANSWER

Column A

Column B

potassium
more reactive
zinc
more reactive
lithium
more reactive
silver
less reactive
gold
less reactive
EDDIE SAYS
It is important to learn the reactivity series, it makes predicting reactions a lot easier. Here it is again:
  • Question 7

Place the metals in the correct order of reactivity by comparing their reactivity to aluminium.

 

CORRECT ANSWER

Column A

Column B

potassium
more reactive
zinc
less reactive
lithium
more reactive
magnesium
more reactive
iron
less reactive
EDDIE SAYS
Here it is again:
As you can see, aluminium is placed between magnesium and carbon in terms of its reactivity.
  • Question 8

What are the two substances produced when a metal reacts with an acid?

CORRECT ANSWER
hydrogen
salt
EDDIE SAYS
Metals react with acids to produce hydrogen gas and a salt. Think of an example, like zinc + nitric acid → zinc nitrate + hydrogen. These reactions always release hydrogen gas (below zinc in the reactivity series) and also a metal salt is formed.
  • Question 9

What is the name of the compound produced when calcium metal is burned in air?

CORRECT ANSWER
calcium oxide
EDDIE SAYS
When any substance is burned, it is reacting with the oxygen in the air to produce an oxide or oxides.
  • Question 10

What is the name of the salt produced when sodium metal reacts with sufuric acid?

CORRECT ANSWER
sodium sulfate
EDDIE SAYS
The metal reacts with the acid to produce a salt. The salt produced depends on the acid and metal that reacted. Here, that's sulfuric acid (or think of it as Hydrogen Sulfate) and sodium, so the salt must be sodium sulfate. Make sense?
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