SMS 2nd 4.5 Test Review 1 (2024-2025)

Front

What happens to the chemical make-up of a substance when it is physically altered, such as crushing an aluminum can?

Back

The chemical make-up of the substance has not changed.

Front

What is the symbol for the ion that has 17 protons and 18 electrons?

Back

Cl⁻

Front

How can you identify an atom with 7 protons and an atomic mass of approximately 14?

Back

Reference the periodic table and find the element that has an atomic number of 7, which represents the number of protons in the atom.

Front

What is an example of a mixture?

Back

Soda is a mixture.

Front

Why does oil float on water?

Back

Oil is less dense than water.

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom.

Front

What is a pure substance?

Back

A pure substance is a material that has a constant composition and consistent properties throughout.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance that cannot be broken down into simpler substances, while a compound is made up of two or more elements chemically combined.

Front

What is density?

Back

Density is the mass of a substance divided by its volume.

Front

What is a chemical change?

Back

A chemical change results in the formation of new substances with different properties.