Chemistry Unit test

Front

What is a molecule?

Back

A molecule is two or more substances that are chemically bonded.

Front

What does C8H18 represent in chemistry?

Back

C8H18, or octane, is a pure substance containing properties different from those of hydrogen and carbon.

Front

What is an ionic bond?

Back

An ionic bond is formed by the transfer of electrons from one atom to another.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that matter is neither created nor destroyed in a chemical reaction.

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 mixture and a pure substance?

Back

A mixture contains two or more substances that are physically combined, while a pure substance has a uniform and definite composition.

Front

What is the smallest part of an element that retains its properties?

Back

The smallest part of an element that retains its properties is an atom.

Front

What is the role of electrons in chemical bonding?

Back

Electrons are involved in chemical bonding by being shared or transferred between atoms.

Front

What is a chemical formula?

Back

A chemical formula is a way of expressing information about the proportions of atoms that constitute a particular chemical compound.

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 that are chemically combined.