Glossary

Question 1

What is the definition of an Element?

Answer 1

A pure substance composed of atoms that all have the same number of protons in the atomic nucleus

Question 2

What is the definition of an Isotope?

Answer 2

One of two or more species of atoms of a chemical element with the same atomic number and position on the periodic table

Question 3

What is the definition of a Solution?

Answer 3

A homogenous mixture of two or more substances

Question 4

What is the definition of a Solvent?

Answer 4

A substance that dissolves other materials to form a solution

Question 5

What is the definition of a Solute?

Answer 5

A substance that is dissolved in a solvent to form a solution

Question 6

What is the definition of a Compound?

Answer 6

A substance of two or more elements chemically bonded in a fixed ratio

Question 7

What is the definition of an Atom?

Answer 7

The basic building block of matter

Question 8

What is the definition of a Molecule?

Answer 8

A group of two or more atoms held together by chemical bonds

Question 9

What is the definition of a Mixture?

Answer 9

The result of combining two or more substances

Question 10

What is the definition of Homogenous?

Answer 10

A substance that is consistent or uniform throughout its volume

Question 11

What is the definition of Heterogeneous?

Answer 11

A substance that is not consistent throughout its volume

Question 12

What is the definition of Suspension?

Answer 12

A dispersion of particles throughout a liquid with the particles being sufficiently large that they will settle out on standing

Question 13

What is the definition of Chromatography

Answer 13

A laboratory technique for the seperation of a mixture into its components

Question 14

What is the definition of a Centrifuge

Answer 14

A rapidly spinning machine that seperates mixtures using density

Question 15

What is the definition of Miscible?

Answer 15

Liquids mix together

Question 16

What is the definition of Immiscible?

Answer 16

Liquids do not mix together

Question 17

What is the definition of Electrostatic?

Answer 17

The force of attraction or repulsion between two charged particles

Question 18

What is the definition of Electronegativity?

Answer 18

The ability of an atom to attract electrons from surrounding atoms within the molecule

Question 19

What is the definition of First Ionisation Energy?

Answer 19

The energy required to remove an outer electron from atoms in the gaseous state

Question 20

What is the definition of Radioactivity?

Answer 20

A change in the number of particles found in the nucleus

Question 21

What is the definition of an Intramolecular Force?

Answer 21

The force of attraction within a molecule

Question 22

What is the definition of an Intermolecular Force?

Answer 22

The force of attraction between molecules

Question 23

What is the definition of an Allotrope?

Answer 23

Different structured forms of the same element in the same state

Question 24

What is Charles’ Law?

Answer 24

The volume of a fixed amount of gas is directly proportional to its absolute temperature if pressure is constant

Question 25

What is Boyle's Law?

Answer 25

The volume of a fixed amount of gas is inversely proportional to its pressure if temperature remains constant

Question 26

What is the value of a Mol?

Answer 26

6.022 x 10^23

Question 27

What are the indicators of a Chemical Reaction?

Answer 27

Change of colour, Production of odour, Change of temperature, Evolution of a gas, Formation of a precipitate

Question 28

What is the definition of a Synthesis Reaction / Direct Contact Reaction?

Answer 28

A reaction in which two or more substances combine to form a new substance

Question 29

What is the definition of a Decomposition Reaction?

Answer 29

A reaction in which a compound is decomposed into two or more other substances

Question 30

What is Avogadro's Law?

Answer 30

Equal volumes of gases at the same temperature and pressure contain an equal number of molecules regardless of the type of gas