Conservation of mass

Describe what is meant by 'conservation of mass' and apply this to chemical and physical changes.

Conservation of mass

Describe what is meant by 'conservation of mass' and apply this to chemical and physical changes.

Lesson details

Key learning points

  1. Describe the conservation of mass related to the atoms in a reaction
  2. Describe a practical method to show the conservation of mass
  3. 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?
Correct answer: gas
liquid
solid
Q2.
What is the total mass of 150 g chocolate, 50 g butter and 150 g of sugar?
150 g
300 g
Correct answer: 350 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.
Correct answer: The measure of the amount of matter in the object.
Q4.
What state is oxygen at room temperature?
Correct answer: gas
liquid
solid
Q5.
At room temperature, the elements in Group 2 of the periodic table are all...
gases.
liquids.
Correct answer: solids.
Q6.
A 5 g ice cube melts into liquid. What is the mass of the liquid?
Correct answer: 5 g
less than 5 g
more than 5 g

6 Questions

Q1.
Which reaction would appear to increase in mass?
Correct answer: Lithium plus oxygen
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.
Correct Answer:balance,measuring masses

measuring masses

Correct Answer:crucible,container for burning magnesium

container for burning magnesium

Correct Answer:bunsen burner,for burning the magnesium

for burning the magnesium

Correct Answer:tripod,for holding the clay triangle above the heat

for holding the clay triangle above the heat

Correct Answer:clay triangle,for holding the crucible above the heat

for holding the crucible above the heat

Q3.
The mass of the reactants is always equal to the mass of the .
Correct Answer: products, product
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?
Correct Answer: 5 g, 5 grams, 5 gram, 5g
Q5.
During a chemical reaction, atoms are ...
created but not destroyed.
created or destroyed.
destroyed but not created.
Correct answer: neither created nor destroyed.
Q6.
10 g of lithium was reacted with 100 g of hydrochloric acid. What is the total mass of the products formed?
Correct Answer: 110 g, 110, 110g, 110 grams

Lesson appears in

UnitScience / Atoms and the periodic table

Science