Font size
WorksheetsChemical Reactions
Total questions: 21
Worksheet time: 21mins
The formation of a new substance is an example of
a chemical reaction
a physical change
An example of a chemical reaction is
a can crushing
paper tearing
ice melting
a camp fire
This image shows examples of
physical changes
chemical reactions
The number and type of atoms is the same before and after
a chemical reaction
both a chemical reaction and physical change
a physical change
The starting materials that react with each other are called
materials
products
ingredients
reactants
The materials produced by a chemical reaction are called
ingredients
products
materials
reactants
Water evaporating is
a chemical reaction
a physical change
Total number atoms in reactants = total number atoms in products
True
False
In this chemical reaction there are
3 reactants
2 reactants and 2 products
2 reactants and 1 product
3 products
The part of the equation that is circles represents
a reactant
a product
React to form
The part of the equation circled is an example of
products
reactants
The arrow circled in the equation means
reversible reaction
force
react to form
The correct word equation for the image above is
nitric oxide + ozone = nitrogen dioxide + oxygen gas
nitric oxide + ozone - nitrogen dioxide + oxygen gas
nitric oxide + oxygen gas --> nitrogen dioxide + oxygen gas
nitric oxide + ozone --> nitrogen dioxide + oxygen gas
Select which molecule is missing from the products of this equation
How many reactants are there in this reaction? "When bicarbonate soda and vinegar are mixed together a chemical reaction occurs. This chemical reaction forms sodium acetate, water, carbon dioxide."
3
2
5
6
How many products are there in this reaction? "When bicarbonate soda and vinegar are mixed together a chemical reaction occurs. This chemical reaction forms sodium acetate, water, carbon dioxide."
3
2
4
5
What happens if oxygen is taken away from this reaction?
Wax and Oxygen → Carbon Dioxide + water (vapour)
less water is produced
less products are produced
the chemical reaction stops taking place
the candle still burns but less bright
In elephants toothpaste a chemical reaction occurs
hydrogen peroxide → water + oxygen gas
Which of the following indicates the reactant(s)?
water and oxygen gas
hydrogen peroxide, water and oxygen gas
hydrogen and peroxide
hydrogen peroxide
In elephants toothpaste a chemical reaction occurs
hydrogen peroxide → water + oxygen gas
Which of the following indicates the products(s)?
water and oxygen gas
hydrogen peroxide, water and oxygen gas
hydrogen and peroxide
hydrogen peroxide
*choose multiple answers*
In the experiment 'elephants toothpaste' a chemical reaction occurs. What signs were there that a chemical reaction had occurred?
temperature change
the atoms were seen moving
precipitate formed
release of gas
*multiple answers*
Which of the following are often sings of a chemical reaction?
temperature change
gas being released
salt dissolving
change in colour
