Grade 9Sciencequiz16 questions

Chemical reactions

Grade 9: physical and chemical changes, acids and bases, pH scale, combustion.

Free to play. Teams answer on one screen; your phone is the remote. No student devices.

Questions

Which of these is a chemical change?
- Ice melting
- Iron rusting
- Sugar dissolving in tea
- Water boiling
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Iron rusting
Which observation is a sign that a chemical reaction has taken place?
- A liquid changes its shape in a new cup
- A new substance with different properties forms
- A solid changes into a liquid when heated
- A solid is broken into smaller pieces
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A new substance with different properties forms
Dissolving salt in water is a chemical change. (True or false?)
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False
Which ion do acids release when dissolved in water?
- Cl- ions
- H+ ions
- Na+ ions
- OH- ions
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H+ ions
What is produced when an acid reacts with a base in neutralisation?
- A salt and carbon dioxide
- A salt and water
- Hydrogen and oxygen
- Only a metal
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A salt and water
Name the type of reaction between hydrochloric acid and sodium hydroxide. (Answer out loud)
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Neutralisation
What is the pH of pure water at room temperature?
- 0
- 1
- 14
- 7
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7
A solution has a pH of 12. How would you describe it?
- Neutral
- Strongly acidic
- Strongly alkaline
- Weakly acidic
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Strongly alkaline
A solution with pH 3 is more acidic than a solution with pH 5. (True or false?)
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True
How many times more acidic is pH 3 than pH 5 (H+ concentration)? (Answer out loud)
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100 times
What colour does universal indicator turn in a strong acid?
- Blue
- Green
- Purple
- Red
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Red
Which gas is needed for a substance to burn in normal combustion?
- Carbon dioxide
- Helium
- Nitrogen
- Oxygen
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Oxygen
What are the products of complete combustion of methane, CH4?
- Carbon and hydrogen
- Carbon dioxide and hydrogen
- Carbon dioxide and water
- Carbon monoxide and hydrogen
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Carbon dioxide and water
Incomplete combustion can produce which poisonous gas?
- Carbon dioxide
- Carbon monoxide
- Oxygen
- Water vapour
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Carbon monoxide
Combustion is an exothermic reaction, meaning it releases heat energy. (True or false?)
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True
In the combustion of methane, how many oxygen molecules react with one CH4? (Answer out loud)
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2

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