chem yr 9

Question 1

what is an electron

Answer 1

travels around nucleus

Question 2

what is an nucleus

Answer 2

the center of the atom it is very small

Question 3

what are protons and neurons

Answer 3

can be found in the nucleus

Question 4

how much relitive charge does proton have

Answer 4

1

Question 5

how much relivive charge do netrons have

Answer 5

0

Question 6

how much relitive mass do protons have

Answer 6

1

Question 7

how much relative chrge does electrons have

Answer 7

-1

Question 8

how much relitive mass do netrons have

Answer 8

1

Question 9

electrons relitive mass

Answer 9

verry small

Question 10

what are pure substances

Answer 10

they have electrons and compounds and all the particles are the same

Question 11

what are impure substances

Answer 11

have mixture and particles are different from each other

Question 12

what is a compound

Answer 12

2 or more types of atoms that cant be separated

Question 13

what is a mixture

Answer 13

2 or more types of atoms that can be separated

Question 14

what is a element

Answer 14

contains only 1type of attom

Question 15

what is a solvent

Answer 15

the liquid a solute is dissolved in

Question 16

what is a solute

Answer 16

a substance that is dissolved to form a solution

Question 17

soluble

Answer 17

a solid that can dissolve in a solvent

Question 18

insoluble

Answer 18

a solid cant dissolve in a solvent

Question 19

whats eveperation

Answer 19

when a liquid turns into gass

Question 20

what is condensing

Answer 20

evaporating solvent from solute

Question 21

whats filtration

Answer 21

separates solvent from solute

Question 22

where does the weight of the attom come from

Answer 22

protons and neutrons

Question 23

properties of diamond

Answer 23

very high boiling and melting point
cant conduct electricity because theres no free electron

Question 24

properties of graphite

Answer 24

very high boiling and melting point
can conduct electricity as it has 1 free electron

Question 25

properties of graphene

Answer 25

has high boiling and melting point can conduct electricity because there are free electrons

Question 26

How are covalent bonds formed

Answer 26

By atoms sharing electrons

Question 27

What’s an ion

Answer 27

An atom that has lost or gained electrons

Question 28

What charges do ions from group 1 and 2 form

Answer 28

In group 1 they form +1and group 2 forms +2

Question 29

What charges do ions from group 6 and 7 form

Answer 29

Group 6 forms 2- and group 7 forms 1-

Question 30

What does a delocalised electron mean

Answer 30

An electron in an ion molecule or single mettle that which are not associated with a single atom or covalent bond

Question 31

How is the periodic table orderd

Answer 31

By atomic number

Question 32

How were the early lists of elements ordered

Answer 32

Atomic mass

Question 33

What name is group 1

Answer 33

Alkali metals

Question 34

Why is group 1 called that

Answer 34

They are metals that react with water to form an alkali

Question 35

What is group is 7 called

Answer 35

Halogens

Question 36

What are group 0

Answer 36

Noble gasses

Question 37

How does melting point for the halogens change Down the group

Answer 37

Increases

Question 38

What’s an exothermic transfer

Answer 38

Transfer to the sorounding

Question 39

What’s an endothermic transfer

Answer 39

Transfer from the sorounding

Question 40

What’s an exothermic reation

Answer 40

A chemical reaction that releases energy

Question 41

What’s an endothermic reaction

Answer 41

A chemical reaction that takes in energy

Question 42

What is relitive mas

Answer 42

The average mass of all the atoms of an element

Question 43

What’s an attom

Answer 43

The smallest part of an element that can exist

Question 44

How can u find out the number of protons in an atom

Answer 44

The atomic number on the periodic table

Question 45

How can u find out the number of netrons

Answer 45

Mass number - the atomic number