Chemical reactions
Understand the difference between physical and chemical changes and write equations using word and symbol equations.
Chemical reactions
Understand the difference between physical and chemical changes and write equations using word and symbol equations.
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Lesson details
Key learning points
- Distinguish between physical and chemical changes
- Write chemical equations to show the formation of compounds
- Write chemical equations to show displacement reactions
- Write chemical equations to show the decomposition of compounds
Equipment
Periodic table
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This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.
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6 Questions
Q1.
When chocolate changes from a solid to a liquid, it is called .
Q2.
What is the process called when water changes from a liquid to a gas?
condensing
freezing
melting
Q3.
Match the compounds to their descriptions.
A substance made from iron and sulfur.
A substance made from hydrogen and chlorine.
A substance made from sodium, carbon and oxygen.
A substance made from iron, sulfur and oxygen.
Q4.
If a compound contains three elements and one is oxygen, the name ends in …
-ade
-ide
-ite
Q5.
How can you tell when an egg is cooking in a frying pan?
It gets colder.
It produces a flash of light.
The smell disappears.
Q6.
Which of the following is a chemical reaction?
chopping an apple
melting chocolate
ripping up paper
6 Questions
Q1.
Which two are signs that a chemical reaction has taken place?
The substance changed state.
The substance was broken into smaller pieces.
The substances were mixed together.
Q2.
A substance changes from a gas to a liquid. This is a change.
Q3.
Select the correct word equation for the following reaction: propane and oxygen react together to produce carbon dioxide and water.
carbon dioxide + water → propane + oxygen
carbon dioxide + water = propane + oxygen
propane + oxygen = carbon dioxide + water
Q4.
To balance a symbol equation…
the number of atoms of each element must be higher in the products than the reactants.
the number of atoms of each element must be lower in the products than the reactants.
Q5.
Match the type of chemical reaction to the equation.
magnesium carbonate → magnesium oxide + carbon dioxide
copper oxide + zinc → zinc oxide + copper
nickel + oxygen → nickel oxide
Q6.
What is the balanced symbol equation for copper + oxygen → copper oxide?
2 CO plus O2 reactants to become 2CoO
Co plus O reactants to become CoO
Cu plus O reactants to become CuO
