Matter 2 test review

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together. For example, NO₂ is a molecule.

Front

What is a compound?

Back

A compound is a substance formed when two or more different elements are chemically bonded together. Examples include water (H₂O) and carbon dioxide (CO₂).

Front

How does surface area affect the rate of dissolution?

Back

The more surface area of the solute that is exposed to the solvent, the faster the solute dissolves.

Front

How many nitrogen atoms are in the compound (NH₄)₂CrO₄?

Back

There are 2 nitrogen atoms in (NH₄)₂CrO₄.

Front

How many elements are in the compound Mg₂As₃COHNi₂?

Back

There are 6 different elements in the compound Mg₂As₃COHNi₂.

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 the chemical formula for water?

Back

The chemical formula for water is H₂O.

Front

What is the chemical formula for carbon dioxide?

Back

The chemical formula for carbon dioxide is CO₂.

Front

What happens to the solubility of a solute when the temperature of the solvent increases?

Back

Generally, the solubility of most solids increases as the temperature of the solvent increases.

Front

What is the significance of the subscript in a chemical formula?

Back

The subscript indicates the number of atoms of the element in the molecule. For example, in H₂O, the '2' indicates there are two hydrogen atoms.