Week 1

Question 1

What is the smallest unit of an element?

Answer 1

An atom

Question 2

What electrical charge do protons have?

Answer 2

Positive

Question 3

What electrical charge do neutrons have?

Answer 3

No electrical charge (neutral)

Question 4

How many elements are abundant in living organisms?

Answer 4

Around 25

Question 5

What are the 6 main elements in living organisms?

Answer 5

H, C, N, O, P, S

Question 6

What unit is atomic mass measured in?

Answer 6

Daltons (Da)a

Question 7

How is a bond formed?

Answer 7

When atoms share electrons

Question 8

2 atoms that share = CB

What is it called when 2 atoms share electrons?

Answer 8

Covalent bond

Question 9

If each atom contributes one electron then what bond is formed?

Answer 9

Single bond

Question 10

If each atom contributes two electrons then what bond is formed?

Answer 10

Double bond

Question 11

How are molecules formed?

Answer 11

When atoms are joined by covalent bonds

Question 12

What is a compound?

Answer 12

If molecules of a substance exist of atoms belonging to two elements

Question 13

What is the difference between organic and inorganic compounds

Answer 13

Organic compounds contain carbon

Question 14

What electrical charge does a molecule have?

Answer 14

Neutral

Question 15

What makes a compound carry an electrical charge?

Answer 15

Compounds take the form of ions

Question 16

What is an anion?

Answer 16

A negatively charged ion

Question 17

What is a cation

Answer 17

A positively charged ion

Question 18

What is a radical? (unpaired)

Answer 18

When a molecule or ion has an unpaired electron

Question 19

What happens when substances are mixed? (chem ent)

Answer 19

They interact to form new chemical entities as part of chemical reactions

Question 20

Describes PC with no relation to EC

Whys is pH a major determinant of chemical reactions?

Answer 20

pH describes the proton concentration in a solution with no relation to electrical charge