Conservation of mass

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

Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
Quiz:

Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.Which state of matter is often invisible?

1/6

Q2.What is the total mass of 150 g chocolate, 50 g butter and 150 g of sugar?

2/6

Q3.What is the mass of an object?

3/6

Q4.What state is oxygen at room temperature?

4/6

Q5.At room temperature, the elements in Group 2 of the periodic table are all...

5/6

Q6.A 5 g ice cube melts into liquid. What is the mass of the liquid?

6/6

Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
Quiz:

Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.Which state of matter is often invisible?

1/6

Q2.What is the total mass of 150 g chocolate, 50 g butter and 150 g of sugar?

2/6

Q3.What is the mass of an object?

3/6

Q4.What state is oxygen at room temperature?

4/6

Q5.At room temperature, the elements in Group 2 of the periodic table are all...

5/6

Q6.A 5 g ice cube melts into liquid. What is the mass of the liquid?

6/6

Video

Click on the play button to start the video. If your teacher asks you to pause the video and look at the worksheet you should:

  • Click "Close Video"
  • Click "Next" to view the activity

Your video will re-appear on the next page, and will stay paused in the right place.

Worksheet

These slides will take you through some tasks for the lesson. If you need to re-play the video, click the ‘Resume Video’ icon. If you are asked to add answers to the slides, first download or print out the worksheet. Once you have finished all the tasks, click ‘Next’ below.

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
Quiz:

Conservation of mass

Don’t worry if you get a question wrong! Forgetting is an important step in learning. We will recap next lesson.

Q1.Which reaction would appear to increase in mass?

1/6

Q2.The increase in mass as magnesium burns can be investigated experimentally. Match the apparatus to its use.
  • balance
  • crucible
  • bunsen burner
  • tripod
  • clay triangle
  • for holding the clay triangle above the heat
  • measuring masses
  • container for burning magnesium
  • for holding the crucible above the heat
  • for burning the magnesium

Where you see this icon you can drag and drop! If you are using your keyboard select and move using space and the arrow keys.

2/6

Q3.The mass of the reactants is always equal to the mass of the .

Fill in the blank.

3/6

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?

4/6

Q5.During a chemical reaction, atoms are ...

5/6

Q6.10 g of lithium was reacted with 100 g of hydrochloric acid. What is the total mass of the products formed?

6/6

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
Quiz:

Conservation of mass

Don’t worry if you get a question wrong! Forgetting is an important step in learning. We will recap next lesson.

Q1.Which reaction would appear to increase in mass?

1/6

Q2.The increase in mass as magnesium burns can be investigated experimentally. Match the apparatus to its use.
  • balance
  • crucible
  • bunsen burner
  • tripod
  • clay triangle
  • for burning the magnesium
  • for holding the clay triangle above the heat
  • container for burning magnesium
  • for holding the crucible above the heat
  • measuring masses

Where you see this icon you can drag and drop! If you are using your keyboard select and move using space and the arrow keys.

2/6

Q3.The mass of the reactants is always equal to the mass of the .

Fill in the blank.

3/6

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?

4/6

Q5.During a chemical reaction, atoms are ...

5/6

Q6.10 g of lithium was reacted with 100 g of hydrochloric acid. What is the total mass of the products formed?

6/6

Lesson summary: Conservation of mass

It looks like you have not completed one of the quizzes.

To share your results with your teacher please complete one of the quizzes.

Time to move!

Did you know that exercise helps your concentration and ability to learn?

For 5 mins...

Move around:
Climb stairs

On the spot:
Chair yoga