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Problem 1: For which of the following activities might you want to hire a chemist?

Abuilding a garage

Btesting a sample of water from a well

Cfinding a comet

Dexamining the structure of plant cells

Problem 2: Which of the following procedures involves a physical change in one of the substances?

Acreating salt by reacting sodium metal and chlorine gas

Ballowing a nail to rust

Cbuilding a model rocket propelled by mixing baking soda and vinegar

Dgrinding chalk into a fine powder

Verified Answer :

Kalahira

Problem 1) From the given options the one that is proper of a chemist is the option B. testing a sample of water form a well. This activity belongs to the field called analytical chemistry which uses special techniques (instruments and processes) to study (separate, identify and quantify matter).
Problem 2) The only of the given procedures that involves a physical change in one substance is the option D. grinding chalk into a fine powder. In this process the molecules remain being the same (same atoms bonded in the number and way).

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