Physical Science Benchmark Review

Front

What are radioactive isotopes?

Back

Radioactive isotopes have very unstable nuclei.

Front

How does a carbon-14 atom differ from a carbon-12 atom?

Back

Carbon-14 has more neutrons than carbon-12.

Front

What conclusion can be drawn from an experiment where sugar dissolves in water at various temperatures?

Back

The greater the temperature of the water, the quicker the solute will dissolve.

Front

How does a chlorine atom become a negatively charged ion?

Back

A chlorine atom becomes a negatively charged ion by gaining an electron.

Front

What is the formula for a compound containing only lithium (Li) and oxygen (O)?

Back

The formula is Li2O.

Front

What is the definition of an ion?

Back

An ion is an atom or molecule that has a net electrical charge due to the loss or gain of one or more electrons.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of only one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.

Front

What is the principle of conservation of mass?

Back

The principle of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.

Front

What is the role of neutrons in an atom?

Back

Neutrons help stabilize the nucleus of an atom and contribute to its mass.

Front

What is a chemical reaction?

Back

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.