Chapter 1 Quest

Choose the one best answer and write its letter in the blank. Which of the following careers involve chemistry?

• engineer

• beautician

• farmer

• all of the above

Which of the following substances is believed to be responsible for the hole in the ozone layer?

• ammonia

• colorfluorocarbons (CFC’s)

• lead

• corbon monoxide

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NGSS.MS-PS1-3

Careful procedures used to make observations of an event by changing factors that might influence the event are called

• scientific laws

• theories

• hypotheses

• experiments

Which of the following is a microscopic property?

• color of a solid

• density of a liquid

• number of atoms in a molecule

• texture of a solid

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NGSS.MS-PS1-1

NGSS.MS-PS1-5

Which of the following is a quantitative observation?

• The object had a mass of 2.3 grams.

• The liquid looked yellow.

• Carbon dioxide was produced.

• A yellow solid formed.

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NGSS.MS-PS3-1

Which of these is a chemical change?

• Wood burns.

• An egg cooks.

• Food is digested.

• All of the above

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Each of the following statements describes an qualitative observation except which one:

• The sky is cloudy today.

• The beaker containing the liquid is getting warmer.

• The wood block has a length of 14.5 cm.

• Smoke from that smokestack is polluting the air.

When using the scientific method, the first step is to:

• Design an experiment

• Complete several experiments

• Make a hypothesis

• Make observations

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When using your five senses to gather information, you are:

• Drawing a conclusion

• Developing a theory

• Making observations

• Establishing scientific law

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Which of these is essential in describing a good hypothesis?

• It must be accurate and true.

• It must involve quantitative observations.

• It must be testable.

• It must be founded on historical law.