General Chemistry Semester 1 Exam

The study of matter and changes in matter best describes the science of:

• biology

• physics

• geology

• chemistry

What happens when the data in an investigation do not support the original hypothesis?

• The scientist gives up and starts an investigation on a new topic.

• The data must be incorrect and are thrown out.

• The hypothesis will be revised.

• The data are altered so that they support the original hypothesis.

What is the most important lab safety rule?

• Never work with chemicals.

• Always use unbreakable glassware.

• Always follow your teacher’s instructions and textbook directions exactly.

• Never do experiments that involve flames or hot objects.

How is 0.00025 written in scientific notation?

• 25 x 10^–5

• 2.5 x 10⁴

• 25 x 10⁵

• 2.5 x 10^–4

Chemical properties:

• include changes of state of a substance.

• include descriptions of mass and color.

• include changes that alter the identity of a substance.

• can be observed without altering the identity of a substance.

The melting of candle wax is classified as a physical change because it:

• produces no new substances.

• transfers energy.

• breaks chemical bonds.

• becomes a new substance.

The state of matter in which particles are rigidly held in fixed positions is the:

• gaseous state.

• liquid state.

• solid state.

Which of the following would be a property that only applies to a gas?

• particles flow

• particles are able to be compressed

• particles are in fixed positions

• particles are in motion

Which beakers contain material that could be described as homogeneous?

• a and b

• b and c

• c and d

• a and d

A substance that is made up of only one kind of atom is a(an):

• element

• compound

• heterogeneous mixture

• homogeneous mixture