Fall Semester Exam

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together. For example, Cl₂ is a molecule made of two chlorine atoms.

Front

What is a compound?

Back

A compound is a substance made up of two or more different elements that are chemically combined in a fixed ratio, such as NaCl (table salt).

Front

What is the difference between an atom and a molecule?

Back

An atom is the smallest unit of an element, while a molecule is made up of two or more atoms bonded together.

Front

Define conduction.

Back

Conduction is the transfer of heat through direct contact between materials.

Front

What affects the rate of dissolution of a solute in a solvent?

Back

The rate of dissolution is affected by temperature, stirring, and the surface area of the solute.

Front

Which state of matter has a definite shape and volume?

Back

Solid.

Front

What is the process of evaporation?

Back

Evaporation is the process by which liquid turns into vapor, usually occurring at the surface of the liquid.

Front

What is the role of heat in chemical reactions?

Back

Heat can provide the energy needed to break bonds in reactants, allowing them to form new products.

Front

What is a chemical symbol?

Back

A chemical symbol is a one or two-letter notation used to represent an element, such as H for hydrogen or Na for sodium.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance without changing its identity, while a chemical change results in the formation of new substances.