Ionic Compound & Chemical/Physical changes 9

Question 1

Element

Answer 1

A pure substance that is made up of one type of atom.

Question 2

Ionic Compound

Answer 2

Atoms combine by gaining or losing electrons.

Question 3

Chemical bonds

Answer 3

Atoms in a molecule and ions in an ionic lattice.

Question 4

Molecule

Answer 4

Neutral particle that is made up of atoms that are joined together by covalent bonds.

Question 5

Ionic lattice

Answer 5

Repeating pattern of positive and negative ions.

Question 6

Polyatomic ion

Answer 6

Ion made up of two or more atoms that are held together with covalent bonds. Polyatomic ion can be positively charged or negatively charged.

Question 7

Covalent compound

Answer 7

Atoms combine by sharing electrons to form molecules.

Question 8

Ionic bond

Answer 8

When there is electron transfer between metals and non-metals.

Question 9

Water is a(n)?

Answer 9

Covalent compound

Question 10

Sodium chloride is a(n)?

Answer 10

Ionic compound

Question 11

Physical change

Answer 11

Appearance of substance changes.

Question 12

Chemical change

Answer 12

New products are formed.

Question 13

Exothermic

Answer 13

Heat is give off.

Question 14

Enothermic

Answer 14

Heat is absorbed.

Question 15

What do the iron and oxygen represent?

Answer 15

The reactants

Question 16

What are the evidence that chemical change has occurred?

Answer 16

• a colour change
• a solid forms
• bubbles of gas form

Question 17

When atom loses electrons, it becomes?

Answer 17

Positive charged

Question 18

When an atom gains electrons, it becomes?

Answer 18

Negative charged