Year 7
Conservation of mass
Describe what is meant by 'conservation of mass' and apply this to chemical and physical changes.
Year 7
Conservation of mass
Describe what is meant by 'conservation of mass' and apply this to chemical and physical changes.
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Lesson details
Key learning points
- Describe the conservation of mass related to the atoms in a reaction
- Describe a practical method to show the conservation of mass
- Show the conservation of mass in chemical equations
Equipment
Calculator
Licence
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6 Questions
Q1.
Which state of matter is often invisible?
liquid
solid
Q2.
What is the total mass of 150 g chocolate, 50 g butter and 150 g of sugar?
150 g
300 g
450 g
Q3.
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.
Q4.
What state is oxygen at room temperature?
liquid
solid
Q5.
At room temperature, the elements in Group 2 of the periodic table are all...
gases.
liquids.
Q6.
A 5 g ice cube melts into liquid. What is the mass of the liquid?
less than 5 g
more than 5 g
6 Questions
Q1.
Which reaction would appear to increase in mass?
Potassium and H2SO4
Decomposition of potassium chlorate
Decomposition of calcium carbonate
Q2.
The increase in mass as magnesium burns can be investigated experimentally. Match the apparatus to its use.
measuring masses
container for burning magnesium
for burning the magnesium
for holding the clay triangle above the heat
for holding the crucible above the heat
Q3.
The mass of the reactants is always equal to the mass of the .
Q4.
A 5 g ice cube is placed in a sealed tube and heated. The ice cube turns into steam. What is the mass of the steam?
Q5.
During a chemical reaction, atoms are ...
created but not destroyed.
created or destroyed.
destroyed but not created.
Q6.
10 g of lithium was reacted with 100 g of hydrochloric acid. What is the total mass of the products formed?