Unit 1-6 Review

Front

Can a mixture be separated?

Back

Yes, mixtures can be separated by physical means such as filtration, distillation, or chromatography.

Front

This diagram represents a _____ (pure substance that is a compound, mixture of elements, pure substance that is an element, mixture of compounds).

Back

pure substance that is a compound.

Front

Oxygen has six valence electrons. When forming an ion, oxygen will: (lose six electrons and have a charge of +6, lose six electrons and have a charge of -6, gain two electrons and have a charge of +2, gain two electrons and have a charge of -2).

Back

gain two electrons and have a charge of -2.

Front

As you move across the periodic table from left to right, the atomic radius decreases. This is because: (the number of protons increases, so attraction to electrons increases, the number of energy levels increases, the number of electrons increases, the atomic mass increases).

Back

the number of protons increases, so attraction to electrons increases.

Front

What type of bonds are shown in the image? (single, double, triple, ionic).

Back

single.

Front

What is a pure substance?

Back

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

Front

Define a mixture.

Back

A mixture is a combination of two or more substances where each substance retains its own properties.

Front

What is an ion?

Back

An ion is an atom or molecule that has gained or lost one or more electrons, resulting in a net charge.

Front

Explain the concept of atomic radius.

Back

Atomic radius is the distance from the nucleus of an atom to the outermost shell of electrons.

Front

What is the significance of valence electrons?

Back

Valence electrons determine how an atom can bond with other atoms and are crucial for chemical reactions.