Science

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Chemical reactions

Understand the difference between physical and chemical changes and write equations using word and symbol equations.

Unit quizzes are being retired in August 2023

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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.When chocolate changes from a solid to a liquid, it is called .

Fill in the blank.

1/6

Q2.What is the process called when water changes from a liquid to a gas?

2/6

Q3.Match the compounds to their descriptions.
  • iron sulfide
  • hydrogen chloride
  • sodium carbonate
  • iron sulfate
  • A substance made from iron, sulfur and oxygen.
  • A substance made from sodium, carbon and oxygen.
  • A substance made from hydrogen and chlorine.
  • A substance made from iron and sulfur.

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.

3/6

Q4.If a compound contains three elements and one is oxygen, the name ends in …

4/6

Q5.How can you tell when an egg is cooking in a frying pan?

Select two (2) boxes

5/6

Q6.Which of the following is a chemical reaction?

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.When chocolate changes from a solid to a liquid, it is called .

Fill in the blank.

1/6

Q2.What is the process called when water changes from a liquid to a gas?

2/6

Q3.Match the compounds to their descriptions.
  • iron sulfide
  • hydrogen chloride
  • sodium carbonate
  • iron sulfate
  • A substance made from hydrogen and chlorine.
  • A substance made from iron, sulfur and oxygen.
  • A substance made from iron and sulfur.
  • A substance made from sodium, carbon and oxygen.

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.

3/6

Q4.If a compound contains three elements and one is oxygen, the name ends in …

4/6

Q5.How can you tell when an egg is cooking in a frying pan?

Select two (2) boxes

5/6

Q6.Which of the following is a chemical reaction?

6/6

Video

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Worksheet

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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:

Compounds

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

Q1.Which two are signs that a chemical reaction has taken place?

Select two (2) boxes

1/6

Q2.A substance changes from a gas to a liquid. This is a change.

Fill in the blank.

2/6

Q3.Select the correct word equation for the following reaction: propane and oxygen react together to produce carbon dioxide and water.

3/6

Q4.To balance a symbol equation…

4/6

Q5.Match the type of chemical reaction to the equation.
  • decomposition
  • displacement
  • neither displacement nor decomposition
  • nickel + oxygen → nickel oxide
  • magnesium carbonate → magnesium oxide + carbon dioxide
  • copper oxide + zinc → zinc oxide + copper

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.

5/6

Q6.What is the balanced symbol equation for copper + oxygen → copper oxide?

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:

Compounds

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

Q1.Which two are signs that a chemical reaction has taken place?

Select two (2) boxes

1/6

Q2.A substance changes from a gas to a liquid. This is a change.

Fill in the blank.

2/6

Q3.Select the correct word equation for the following reaction: propane and oxygen react together to produce carbon dioxide and water.

3/6

Q4.To balance a symbol equation…

4/6

Q5.Match the type of chemical reaction to the equation.
  • decomposition
  • displacement
  • neither displacement nor decomposition
  • copper oxide + zinc → zinc oxide + copper
  • nickel + oxygen → nickel oxide
  • magnesium carbonate → magnesium oxide + carbon dioxide

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.

5/6

Q6.What is the balanced symbol equation for copper + oxygen → copper oxide?

6/6

Lesson summary: Chemical reactions

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Atoms and the periodic table
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Conservation of mass

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