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Chemistry around us – practice for Year 9

Sample questions on Chemistry around us with the right answer and a worked solution, from easy to hard. In the Pickles Academy app a child gets new questions of the same kind every time, so they can't just learn the answers by heart.

Subject
Chemistry
Year
Year 9
Curriculum area
Chemistry in everyday life

Question types: Chemistry around us YES/NO

Rule: Chemistry around us

Table salt is sodium chloride (NaCl), baking soda is sodium hydrogencarbonate, vinegar is dilute ethanoic acid.

Burning fuels makes carbon dioxide; with too little air also poisonous carbon monoxide (CO).

Example: Baking soda fizzes with vinegar: carbon dioxide is given off.

Watch out: Never mix cleaning products: bleach with an acidic cleaner gives off poisonous chlorine.

Sample questions

  1. Question 1 Easy

    Decide whether each statement is true (YES) or not (NO).

    1. Carbon monoxide is a poisonous gas with no colour or smell.
    2. Aluminium is the most common metal in the Earth’s crust.
    3. Diamond and graphite are both made of carbon.
    Show the solution
    Answer:
    1. Carbon monoxide is a poisonous gas with no colour or smell. – yes
    2. Aluminium is the most common metal in the Earth’s crust. – yes
    3. Diamond and graphite are both made of carbon. – yes

    How it works: 1. YES 2. YES 3. YES

  2. Question 2 Normal

    Decide whether each statement is true (YES) or not (NO).

    1. Distilled water conducts electricity well.
    2. Air is about 78 % nitrogen and 21 % oxygen.
    3. Iron rusts when it reacts with oxygen and water.
    4. A molecule of ozone is made of three oxygen atoms.
    Show the solution
    Answer:
    1. Distilled water conducts electricity well. – no
    2. Air is about 78 % nitrogen and 21 % oxygen. – yes
    3. Iron rusts when it reacts with oxygen and water. – yes
    4. A molecule of ozone is made of three oxygen atoms. – yes

    How it works: 1. NO – pure water conducts very poorly 2. YES 3. YES 4. YES

  3. Question 3 Hard

    Decide whether each statement is true (YES) or not (NO).

    1. Carbon monoxide is a poisonous gas with no colour or smell.
    2. Aluminium is the most common metal in the Earth’s crust.
    3. Diamond and graphite are both made of carbon.
    4. A carbon dioxide fire extinguisher works by giving the fire oxygen.
    5. Gold rusts quickly in air.
    Show the solution
    Answer:
    1. Carbon monoxide is a poisonous gas with no colour or smell. – yes
    2. Aluminium is the most common metal in the Earth’s crust. – yes
    3. Diamond and graphite are both made of carbon. – yes
    4. A carbon dioxide fire extinguisher works by giving the fire oxygen. – no
    5. Gold rusts quickly in air. – no

    How it works: 1. YES 2. YES 3. YES 4. NO – carbon dioxide keeps oxygen away from the fire 5. NO – gold is very unreactive

Related topics

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