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17 December, 05:26

For which of the following activities might you want to hire a chemist?

A. examining the structure of plant cells

B. building a fence

C. building a wood storage shed

D. testing a rock sample for gold content

Which of the following procedures involves a physical change in one of the substances?

A. creating salt by reacting sodium metal and chlorine gas

B. allowing a nail rust

C. separating a salt solution by evaporating the water

D. building a model rocket propelled by mixing baking soda and vinegar

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Answers (2)
  1. 17 December, 05:36
    0
    A. examining the structure of plant cells

    Incorrect. A biologist is required.

    B. building a fence

    Incorrect. A carpenter is required.

    C. building a wood storage shed

    Incorrect. A carpenter is required.

    D. testing a rock sample for gold content

    Incorrect. A chemist is required.

    A. creating salt by reacting sodium metal and chlorine gas

    Incorrect. This is a chemical change as a new product is formed.

    B. allowing a nail rust

    Incorrect. This is a chemical change as it is the oxidation of iron to form iron oxide, rust.

    C. separating a salt solution by evaporating the water

    Correct. This is a physical change as salt gets separated from water and no new product is formed.

    D. building a model rocket propelled by mixing baking soda and vinegar

    Incorrect. This is a chemical change.
  2. 17 December, 05:48
    0
    For which of the following activities might you want to hire a chemist?

    Answer: D. testing a rock sample for gold content

    Which of the following procedures involves a physical change in one of the substances?

    Answer: C. separating a salt solution by evaporating the water
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