Year 10
Higher

# Chemical formulae and conservation of mass

Define conservation of mass and apply this chemical equation.

Year 10
Higher

# Chemical formulae and conservation of mass

Define conservation of mass and apply this chemical equation.

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## Lesson details

### Key learning points

1. Interpret chemical formulae
2. Apply conservation of mass to equations

Periodic table

### Licence

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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## Worksheet

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## Starter quiz

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### 6 Questions

Q1.
What is the chemical formula for carbon dioxide?
CO formula
C2O formula
2CO formula
Q2.
Which statement is correct about the formula below?
There are two potassium atoms, four sulfur atoms and four oxygen atoms.
Correct answer: There are two potassium atoms, one sulfur atom and four oxygen atoms.
There is one potassium atom, one sulfur atom and four oxygen atoms.
There is one potassium atom, two sulfur atoms and four oxygen atoms.
Q3.
Matter can be solid, liquid or gas. Oxygen is a at room temperature.
Q4.
What is the mass of an object?
How compact the particles are within the object.
The amount of space the object occupies.
The force acting on the object due to gravity.
Correct answer: The measure of the amount of matter in the object.
Q5.
100 g of ice cream melts. What is the mass of the liquid ice cream?
Correct Answer: 100 g, one hundred grams, 100 grams
Q6.
60 g of calcium reacts with 50 g of oxygen. How many grams of calcium oxide are produced?
10 g
50 g
60 g

## Exit quiz

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### 6 Questions

Q1.
How many atoms of sulfur are present in the formula below?
2
3
4
Q2.
The law of conservation of mass states ...
the number of atoms in the reactants is always more than the number of atoms in the products.
Correct answer: the number of atoms in the reactants is equal to the number of atoms in the products.
the number of atoms/mass of reactants can be more or less than the atoms/mass of the product.
Correct answer: the total mass of the reactants is equal to the total mass of the products.
the total mass of the reactants is more than the total mass of the products.
Q3.
20 g of oxygen reacts with 15.5 g of lithium. How many grams of lithium oxide are produced?
15.5 g
20.0 g
4.5 g
Q4.
Aluminium oxide breaks down into aluminium and oxygen. If the reaction takes place on a balance, the mass appears to...
Correct answer: decrease because a gas was produced.
decrease because one of the reactants was a gas.
increase because a gas was produced.
increase because one of the reactants was a gas.
Q5.
A substance contains one silicon atom, three hydrogen atoms and three oxygen atoms. The hydrogen and oxygen form hydroxide ions. What is the correct formula?
3SiOH