Midterm Chemistry 2024-2025- PART 1 Mrs. Chacon

Front

What is a colloid?

Back

A colloid is a mixture where tiny particles of one substance are evenly distributed throughout another substance, but they do not settle out. Examples include milk and fog.

Front

What did Ernest Rutherford's gold foil experiment demonstrate about atomic structure?

Back

It demonstrated that atoms consist largely of empty space with a dense, positively charged nucleus.

Front

How do you calculate the mass number of an atom?

Back

The mass number is calculated by adding the number of protons and neutrons in the atom's nucleus.

Front

What is a suspension?

Back

A suspension is a mixture in which particles are dispersed throughout a liquid or gas but are large enough that they settle out over time. An example is oil in water.

Front

What is a solution?

Back

A solution is a homogeneous mixture where one substance (the solute) is completely dissolved in another (the solvent). An example is vinegar.

Front

What is the charge of a proton?

Back

A proton has a positive charge.

Front

What is the charge of an electron?

Back

An electron has a negative charge.

Front

What is the charge of a neutron?

Back

A neutron has no charge (it is neutral).

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.

Front

What is the role of electrons in an atom?

Back

Electrons orbit the nucleus and are involved in chemical bonding and reactions.