2.1.2 Compounds, formulae and equations

Question 1

Atom

Answer 1

-The smallest unit of matter that shows the chemical properties of an element.

Question 2

Molecule

Answer 2

-The smallest part of a covelent compound that can exist while retaining its chemical identity consisting of two or more atoms covenlently bonded.

Question 3

Ion

Answer 3

-A positively or negatively charged atom or a covelently bonded group of atoms (polyatomic ion) where the number of electrons is different to the number of protons.

Question 4

Element

Answer 4

-Made of atoms or molecules. Only one type of atom present.

Question 5

Mixture

Answer 5

• 2 or more substances not chemically reacted. They don’t have a formula and can be easily separated.

Question 6

Compound

Answer 6

-Made of ions or molecules, 2 or more different elements chemically bonded.

Question 7

Stoichiometry

Answer 7

-The ratio of the amount of moles of each substance in a chemical reaction.

Question 8

Metal+acid

Answer 8

-Salt+hydrogen

Question 9

Metal carbonate+acid

Answer 9

-Salt+carbon dioxide+water

Question 10

Acid+alkali

Answer 10

-Salt+water

Question 11

Metal+salt solution

Answer 11

-Displacement reaction

Question 12

Salt

Answer 12

-When a proton on an acid is replaced by a positive ion.