C2 Atoms, Ions, And Compounds

Question 1

What’s the relative mass of a proton

Answer 1

1

Question 2

What’s the relative mass of a neutron

Answer 2

1

Question 3

What’s the relative mass of a electron

Answer 3

1/1836

Question 4

What’s the relative charge of a proton

Answer 4

1+

Question 5

What’s the relative charge of a neutron

Answer 5

0

Question 6

What’s the relative charge of a electron

Answer 6

1-

Question 7

Define isotope

Answer 7

Atoms of same element with same number of electrons and protons, but different numbers of neutrons and different masses

Question 8

What’s the mass number

Answer 8

Number of protons + number of neutrons

Question 9

What’s the atomic number

Answer 9

Number of protons

Question 10

What’s an ion

Answer 10

A charged atom

Question 11

Define relative isotopic mass

Answer 11

Mass of an isotope relative to 1/12th of the mass of an atom of C-12

Question 12

Define relative atomic mass

Answer 12

Weighted mean mass of an atom of an element relative to 1/12th of the mass of an atom of C-12

Question 13

What’s a binary compound

Answer 13

Contains 2 elements only

Question 14

What’s a polyatomic ion

Answer 14

An ion that contains more than 1 element bonded. together

Question 15

What’s a diatomic molecule

Answer 15

2 of the same atoms bonded together e.g. 02,C12

Question 16

What’s a formula unit

Answer 16

In ionic compounds, the formula worked out from the ionic charges that are used in equations

Question 17

Ammonium ion

Answer 17

NH4+

Question 18

Hydroxide ion

Answer 18

OH-

Question 19

Nitrate ion

Answer 19

NO3-

Question 20

Nitrite ion

Answer 20

NO2-

Question 21

Hydrogen carbonate ion

Answer 21

HCO3-

Question 22

Manganate(VII)(permanganate) ion

Answer 22

MnO4-

Question 23

Carbonate ion

Answer 23

CO3^2-

Question 24

Sulfate ion

Answer 24

SO4^2-

Question 25

Sulfite ion

Answer 25

SO3^2-

Question 26

Dichromate(VI) ion

Answer 26

CrO7^2-

Question 27

Phosphate ion

Answer 27

PO4^3-

Question 28

What was stated in Daltons atomic theory

Answer 28

Atoms are tiny particles made of elements

Atoms can’t be divided

All atoms in a element are same

Atoms of 1 element are diff to those of other elements

Question 29

What did Thompson discover about electrons

Answer 29

have negative charge

Can be deflected by magnet and electric field

Have very small mass

Question 30

Explain plum pudding model

Answer 30

Atoms are made up of negative electrons owing around in a sea of positive charge

Question 31

What were Rutherford proposal after the gold leaf experiment

Answer 31

Most of mass & positive charge of atom are in nucleus

Electrons orbit nucleus

Most of atoms volume is space between nucleus and electrons

Overall pos and neg charges must balance

Question 32

Explain current model of atom

Answer 32

Protons and neutrons found in nucleus

Electrons orbit in shells

Nucleus is tiny compared to total volume of atom

Most of atoms mass is in nucleus

Most of atom is empty space between nucleus and electrons

Question 33

Which 2 particles make up most of atoms mass

Answer 33

Protons and neutrons

Question 34

Why does diff isotopes of same element react in same way

Answer 34

Neutrons have no impact on chemical reactivity

Reactions involve electrons, isotopes have same number of electrons in same arrangement

Question 35

The relative isotopic mass is the same as which number

Answer 35

Mass number

Question 36

What 2 assumptions are made when calculating mass number

Answer 36

Contribution of electron is neglected

Mass of both neutron and proton is taken as 1.0u

Question 37

What are molecular ions

Answer 37

Covalently bonded atoms that lose or gain electrons

Question 38

Which are 4 elements that don’t teemed to form ions and why

Answer 38

Beryllium, boron, carbon and silicon

Requires a lot of energy to transfer outer shell electrons

Question 39

How does a mass spectrometer work

Answer 39

Sample made into positive ions

They pass through apparatus & are separated according to mass to charge ratio

Computer analyses data and produces mass spectrum

Question 40

What are the uses of mass spectrometry

Answer 40

Identify unknown compounds

Find relative abundance of each isotope of an element

Determine structural information