Chemistry Unit Test

Front

What is the Law of Conservation of Mass?

Back

The Law of Conservation of Mass states that in a chemical reaction, the total mass of the products equals the total mass of the reactants.

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

What are metals?

Back

Metals are elements that are shiny, good conductors of heat and electricity, and are malleable and ductile.

Front

How many hydrogen atoms are in a molecule of glucose (C6H12O6)?

Back

There are 12 hydrogen atoms in a molecule of glucose.

Front

What does the number 4 represent in the chemical formula 4NH3?

Back

The number 4 is a coefficient, indicating that there are four molecules of ammonia (NH3).

Front

What is a chemical reaction?

Back

A chemical reaction is a process in which substances (reactants) are transformed into different substances (products) through the breaking and forming of chemical bonds.

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.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of only one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.

Front

What is a molecule?

Back

A molecule is the smallest unit of a chemical compound that retains its chemical properties, consisting of two or more atoms bonded together.