Physical Science 8 | Midterm Practice 2

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that in a closed system, the mass of the reactants must equal the mass of the products in a chemical reaction.

Front

What type of bond is formed between carbon and oxygen?

Back

A covalent bond is formed between carbon and oxygen, where they share electrons.

Front

What is a molecule?

Back

A molecule is two or more atoms held together by chemical bonds.

Front

What characterizes a heterogeneous mixture?

Back

A heterogeneous mixture has a non-uniform composition and its components are not chemically bonded.

Front

Which of the following is a covalent compound: NaCl, KBr, CO2, or AlCl3?

Back

CO2 (carbon dioxide) is a covalent compound.

Front

What is an ionic bond?

Back

An ionic bond is a type of chemical bond that occurs when electrons are transferred from one atom to another, resulting in the formation of charged ions.

Front

What is a chemical reaction?

Back

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.

Front

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

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.

Front

What is a reactant?

Back

A reactant is a substance that undergoes a chemical change in a reaction.

Front

What is a product in a chemical reaction?

Back

A product is a substance that is formed as a result of a chemical reaction.