AS-Chemistry Worksheet: Definitions and Tables

An atom is defined as:

• The smallest unit of matter that retains the properties of an element.

• A large molecule made up of many elements.

• A type of chemical reaction.

• A form of energy.

An element is defined as which of the following?

• A substance that cannot be broken down into simpler substances by chemical means.

• A mixture of two or more substances.

• A substance that can be separated by physical means.

• A compound made of different atoms.

A compound is defined as:

• A substance made up of two or more different elements chemically combined.

• A mixture of two or more substances that are not chemically combined.

• A single element in its purest form.

• A solution of solids dissolved in a liquid.

An ion is defined as:

• An atom or molecule with a net electric charge due to the loss or gain of one or more electrons.

• A neutral atom with no charge.

• A molecule that cannot conduct electricity.

• A particle with only protons and neutrons.

A molecule is defined as:

• A group of two or more atoms bonded together.

• A single atom with no bonds.

• A type of chemical reaction.

• A charged particle formed by loss or gain of electrons.

An isotope is defined as:

• Atoms of the same element with different numbers of neutrons.

• Atoms of different elements with the same number of protons.

• Atoms of the same element with different numbers of protons.

• Atoms of different elements with the same number of electrons.

Exothermic is defined as:

• A process that releases heat energy to its surroundings.

• A process that absorbs heat energy from its surroundings.

• A process that does not involve any energy change.

• A process that only occurs at low temperatures.

Displacement is defined as:

• The shortest distance from the initial to the final position of an object.

• The total distance traveled by an object.

• The speed at which an object moves.

• The time taken to travel a certain distance.

The atomic number is defined as:

• The number of protons in the nucleus of an atom.

• The number of neutrons in the nucleus of an atom.

• The total number of electrons and protons in an atom.

• The mass number of an atom.

The definition of Empirical formula is:

• The simplest whole-number ratio of atoms of each element in a compound.

• The actual number of atoms of each element in a molecule.

• The total mass of a compound divided by its molar mass.

• The arrangement of atoms in a crystal lattice.