Chemistry

Question 1

What is a mixture?

Answer 1

Two or more elements NOT chemically joined together

Question 2

What are properties of a mixture?

Answer 2

They can be physically separated using methods such as filtration, distillation, fractional distillation, chromatography etc

Question 3

What is at the centre of atoms?

Answer 3

Protons and neutrons ( the nucleus )

Question 4

Where is most of the mass in an atom

Answer 4

In the nucleus

Question 5

How do you find the number of protons?

Answer 5

The atomic number

Question 6

How do you find the number of neutrons?

Answer 6

Mass number - the proton number ( atomic number )

Question 7

How do you find the number of electrons?

Answer 7

The atomic number

Question 8

What is an ion?

Answer 8

An atom which has lost or gained electrons, they have charge.

Question 9

A positive ion will have …… electron(s)

Answer 9

Lost

Question 10

A negative ion will have …… electron(s)

Answer 10

Gained

Question 11

What is the ‘Rule of reactivity’

Answer 11

A more reactive metal can displace a less reactive one from a compound

Question 12

What is the least reactive metal?

Answer 12

Gold

Question 13

What is the most reactive metal ( we have learnt about )

Answer 13

Potassium

Question 14

1 -1
Na Cl

Answer 14

NaCl

Question 15

1 2
K S

Answer 15

K(2)S

Question 16

1 -2
Li O

Answer 16

Li(2)O

Question 17

2 -3
Mg N

Answer 17

Mg(3)N(2)

Question 18

2 -2
Mg O

Answer 18

MgO

Question 19

3 -2
Al O

Answer 19

Al(2)O(3)

Question 20

3 -1
Al Cl

Answer 20

AlCl(3)

Question 21

2 -2
Ca S

Answer 21

CaS

Question 22

What is a covalent bond?

Answer 22

A covalent bond is one which atoms share electrons rather than exchange in order to achieve full outer shells

Question 23

Na(11) 2,8,1
What is the ion?

Answer 23

2,8 Na(1+)

Question 24

Cl(17) 2,8,7
What is the ion?

Answer 24

2,8,8 Cl(1-)

Question 25

Li(3) 2,1
What is the ion?

Answer 25

2 Li(1+)

Question 26

K(19) 2,8,8,1
What is the ion?

Answer 26

2,8,8 K(1+)