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WorksheetsY7 Physical and chemical changes
Total questions: 16
Worksheet time: 9mins
Which statement below is true?
Physical changes are those which change the colour of a chemical.
Physical changes only change the size of an object.
Physical change changes the matter into something totally different.
The same chemical will still be there after a physical change.
A change that does not result in a new substance.
Chemical Change
Physical Change
The starting materials in a chemical reaction are called the...
Products
Reactants
Starters
Reactors
A substance that is formed as the result of a chemical reaction is a __________________
Product
Reactant
Productant
Ender
Which of these is NOT necessarily a sign that a chemical change has occurred?
A liquid disappearing
An unexpected color change
A substance gets hot or cold on its own
A new solid material appears
Physical changes are...
usually easy to reverse
very hard to reverse
usually accompanied by flames or light
very rare
Which of the following is an example of a chemical change?
Water freezes to form ice
Sugar dissolves in water
Petrol burns in a car engine
A piece of metal expands when it is heated
When rust forms it is an example of a...
chemical Change
physical Change
neither
Bananas rotting is a...
chemical Change
physical Change
neither
A tire is inflated using air
Chemical change
Physical change
Neither
Pancakes (or anything else) cooking
Physical change
Chemical change
Neither
carbon dioxide + water --> glucose + oxygen
Photosynthesis is an example of a..
physical change
chemical change
Neither
Exploding fireworks is a
Physical Change
Chemical Change
Neither
A teacher is demonstrating physical and chemical changes to their class.
- Which action should they use to demonstrate a chemical change?
Cutting a piece of paper with scissors.
Melting a piece of chocolate.
Ripping a piece of paper with their hands.
Burning a piece of paper with a match.
During a chemical reaction, bubbles may be seen. This is a sure sign that...
At least one of the reactants is a gas
One of the chemicals contained a gas
At least one of the products of the reaction is a gas
The reaction is boiling the air around it
Challenge! The picture represents the particles involved in a chemical reaction. Which of these is not true?
Some of the atoms can be destroyed and new atoms made
New chemical bonds are formed between atoms
Chemical reactions re-arrange the atoms into different particles
Old chemical bonds are broken
