Year 9 Science Chemistry 2

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| By Bec_c
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Bec_c
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Quizzes Created: 1 | Total Attempts: 1,850
Questions: 17 | Attempts: 1,850

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Chemistry Quizzes & Trivia

This is to be taken after studying the year 9 topic chemistry 2.


Questions and Answers
  • 1. 

    Which of the following is an example of a chemical change?

    • A.

      A hot dog is cooked

    • B.

      Melting butter

    • C.

      Water is boiled

    • D.

      Old ham goes bad

    Correct Answer
    D. Old ham goes bad
    Explanation
    Ham's atoms are reacting to form a new substance, all the rest are reversible (hot dog is just warmed, state of butter and water is just changed)

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  • 2. 

    Check which of the following are examples of physical change.

    • A.

      A nail rusts in water.

    • B.

      Freezing water

    • C.

      Dissolving aspirin.

    • D.

      Cooking an egg.

    Correct Answer(s)
    B. Freezing water
    C. Dissolving aspirin.
    Explanation
    The other two (rust and egg) involve change of atoms.

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  • 3. 

    A chemical change is the formation of at least one new substance.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    A chemical change involves the creation of new substances with different chemical properties. This can occur through various processes such as a reaction between two or more substances, the breakdown of a compound into its components, or the rearrangement of atoms within a molecule. In contrast, a physical change does not result in the formation of new substances, but rather alters the state or appearance of a material. Therefore, the statement that a chemical change involves the formation of at least one new substance is true.

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  • 4. 

    A chemical change is easily reversible.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    A chemical change is difficult to reverse where as a physical change is easily reversible.

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  • 5. 

    Which of the following are not indications of chemical change.

    • A.

      Gas evolved.

    • B.

      Odour produced.

    • C.

      State change.

    • D.

      Fizzing.

    • E.

      New solid is formed.

    • F.

      Reactants solidify.

    • G.

      Colour change.

    • H.

      Temperature change.

    • I.

      Solid disappears.

    Correct Answer(s)
    C. State change.
    F. Reactants solidify.
    Explanation
    State change and reactants solidifying are not indications of chemical change because they are physical changes. In a state change, the substance transitions from one state of matter to another (e.g. from solid to liquid or gas), but its chemical composition remains the same. Reactants solidifying refers to a substance returning to a solid state, but this does not involve a chemical reaction. Chemical changes, on the other hand, involve the formation of new substances with different chemical properties.

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  • 6. 

    In a chemical reaction new atoms are formed.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    In a chemical reaction new atoms are not formed or created but the existing atoms are rearranged into new substances.

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  • 7. 

    The Law of Conservation of Mass states: matter can neither be c____ or d_____ during a chemical reaction.

    Correct Answer
    created, destroyed
    created destroyed
    reated, estroyed
    reated estroyed
    Explanation
    The Law of Conservation of Mass states that matter can neither be created nor destroyed during a chemical reaction. This means that the total mass of the reactants must be equal to the total mass of the products.

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  • 8. 

    The Law of Constant Proportion states that:

    • A.

      Matter can neither be created or destroyed in a chemical reaction.

    • B.

      A molecule, regardless of its components, will always have equal amounts of all elements.

    • C.

      Metals and non-metals, when the products of a reaction, will always be in equal quantities.

    • D.

      A compound, no matter how it is formed, always contains the same relative amounts of each element.

    • E.

      Oxygen and carbon are always in proportional ratios in the earth's atmosphere.

    Correct Answer
    D. A compound, no matter how it is formed, always contains the same relative amounts of each element.
    Explanation
    The Law of Constant Proportion states that a compound, no matter how it is formed, always contains the same relative amounts of each element. This means that the ratio of elements in a compound is always constant, regardless of the method used to create the compound. For example, if a compound is made up of elements A and B, it will always have the same ratio of A to B, regardless of whether it is formed through a chemical reaction or any other means. This law helps to explain the consistent composition of compounds and allows chemists to predict the amounts of elements present in a compound.

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  • 9. 

    Which of the following are examples of a combustion reaction.

    • A.

      Burning petrol.

    • B.

      Natural gas in stove.

    • C.

      Zinc rusting.

    • D.

      Methane burning in a gas jet.

    • E.

      Zinc Carbonate decomposing.

    • F.

      Sodium hydroxide and hydrochloric acid reacting.

    Correct Answer(s)
    A. Burning petrol.
    B. Natural gas in stove.
    D. Methane burning in a gas jet.
    Explanation
    zinc rusting is corrosion, zinc carbonate decopmosing is decompostion and sodium hyrdoxide with acid is a neutralisation reaction.

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  • 10. 

    Exothermic reaction involves the release of heat.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Endothermic involves the absorption of heat.

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  • 11. 

    A c______ reaction is when substances react with o_____ to release h___.

    Correct Answer
    combustion, oxygen, heat
    combustion oxygen heat
    ombustion, xygen, eat
    ombustion xygen eat
    Explanation
    A combustion reaction is when substances react with oxygen to release heat.

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  • 12. 

    In combustion reactions hyrdocarbons combine with nitrogen in the air to form carbon dioxide gas and nitrogen hydroxide.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    In combustion reactions hyrdocarbons combine with oxygen in the air to form carbon dioxide gas and water vapour.

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  • 13. 

    A corrosion reaction is ....

    • A.

      When carbon dioxide causes an object to implode.

    • B.

      Ham forming mould.

    • C.

      Where a metal is 'eaten away' by substances in the air or water.

    • D.

      When a liquid evaporates due to a reaction with a transitional metal.

    Correct Answer
    C. Where a metal is 'eaten away' by substances in the air or water.
    Explanation
    A corrosion reaction refers to the process where a metal is gradually deteriorated or "eaten away" by substances present in the air or water. This happens due to chemical reactions between the metal and the corrosive substances, which can lead to the formation of rust or other forms of corrosion on the metal surface. Carbon dioxide causing an object to implode, ham forming mold, and liquid evaporation due to a reaction with a transitional metal are unrelated to corrosion reactions.

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  • 14. 

    G______ is when m_____ are protected by z____ to stop reacting with w____ and o_____. (no punctuation or capitals)

    Correct Answer
    galvanising metal zinc water oxygen
    alvanising etal inc ater xygen
    galvanising metals zinc water oxygen
    alvanising etals inc ater xygen
    galvanisation metal zinc water oxygen
    alvanisation etal inc ater xygen
    galvanisation metals zinc water oxygen
    alvanisation etals inc ater xygen
    Explanation
    Galvanising is the process of coating metal with zinc to protect it from reacting with water and oxygen. This process forms a protective layer on the metal surface, preventing corrosion and extending its lifespan.

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  • 15. 

    Zinc reacts with oxygen to form zinc oxide.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    an example of a corrosion reaction.

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  • 16. 

    Zinc breaking down into zinc oxide and carbon dioxide is an example of a....

    • A.

      Corrosion reaction.

    • B.

      Decomposition reaction.

    • C.

      Combustion reaction.

    Correct Answer
    B. Decomposition reaction.
    Explanation
    Zinc breaking down into zinc oxide and carbon dioxide is an example of a decomposition reaction. In this reaction, a single compound (zinc) is broken down into two or more simpler substances (zinc oxide and carbon dioxide). This is different from a corrosion reaction, which involves the gradual deterioration of a material due to chemical reactions with its environment, and from a combustion reaction, which involves the rapid reaction of a substance with oxygen, typically resulting in the release of heat and light.

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  • 17. 

    When naming compounds a non-metal goes before a metal.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    When naming compounds a metal goes before a non-metal.

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  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Oct 04, 2011
    Quiz Created by
    Bec_c
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