Chemistry A Test

Front

What is a chemical change?

Back

A chemical change is a process where one or more substances are transformed into different substances with distinct properties.

Front

Give an example of a physical change.

Back

Water evaporating is an example of a physical change.

Front

What is an isotope?

Back

An isotope is an atom that has the same number of protons but a different number of neutrons.

Front

List the three subatomic particles that make up an atom.

Back

Protons, neutrons, and electrons.

Front

What do the blue numbers in a chemical formula represent?

Back

The blue numbers represent subscripts, which indicate the number of atoms of each element in a molecule.

Front

How many protons does a sulfur atom have?

Back

A sulfur atom has 16 protons.

Front

What is the charge of an electron?

Back

An electron has a negative charge.

Front

How many electrons does a neutral sulfur atom have?

Back

A neutral sulfur atom has 16 electrons.

Front

What is the significance of subscripts in a chemical formula?

Back

Subscripts indicate the number of atoms of each element in a compound.

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.