Atom And Redox

Question 1

Relative mass of an electron

Answer 1

1/2000

Question 2

Relative isotopic mass -

Answer 2

Mass of an isotope compared with 1/12 of the mass of carbon 12

Question 3

Relative atomic mass -

Answer 3

Weighted mean mass of an atom of an element compared with 1/12 of the mass of carbon 12

Question 4

What is z the symbol for ?

Answer 4

Charge

Question 5

What is an ion ?

Answer 5

A charged atom / group of atoms due to unequal number of protons and neutrons

Question 6

What are the 3 main factors of nuclear attraction ?

Answer 6

Atomic radius
Shielding (no. of inner shells)
Nuclear charge

Question 7

As the nuclear attraction decreases…

Answer 7

The ionisation energy decreases

Question 8

What is an orbital?

Answer 8

Region which can hold up to 2 electrons with opposite spins

Question 9

What is a sub shell ?

Answer 9

Made up of orbitals

E.g. s / p / d

Question 10

why is second ionisation energy always greater than the first ?

Answer 10

electrons pull closer to nucleus as more are removed, meaning more energy is needed to remove them

Question 11

what is the no. of orbitals with d shell ?

Answer 11

5 (so 10 electrons)

Question 12

what is the no. of orbitals with f shell ?

Answer 12

7 (so 14 electrons)

Question 13

oxidation no. of uncombined elements

Answer 13

0

e.g. H² is 0

Question 14

oxidation no. of simple ions

Answer 14

the charge of the ion

e.g. I- is 1-

Question 15

oxidation no. of (combined) fluorine

Answer 15

-1

Question 16

oxidation no. of (combined) oxygen

Answer 16

-2 exc with hydrogen peroxide it is -1

Question 17

oxidation no. of (combined) hydrogen

Answer 17

+1 exc in hydrides it is -1

e.g. LiH , H is -1

Question 18

oxidation no. of (combined) group 1 metals

Answer 18

+1

Question 19

oxidation no. of (combined) group 2 metals

Answer 19

+2

Question 20

the sum of oxidation no. in a compound =

Answer 20

the charge

Question 21

what is the nucleon number ?

Answer 21

mass number

Question 22

define isotope

Answer 22

atoms with same no of protons, diff no of neutrons

Question 23

given the no. of particles, how do you find no. of moles …

Answer 23

no. of particles / Avogadro’s number

Question 24

what is Avogadro’s number?

Answer 24

6.02x10^23

Question 25

what is molar mass measured in ?

Answer 25

g mol ^-1

Question 26

how to work out no. of atoms in something ?

Answer 26

work out moles x by Avogadro’s number, then x by no. of atoms in molecule

Question 27

acid + base =

Answer 27

salt + water

Question 28

define acid

Answer 28

produces H+ ions in aqueous solutions

Question 29

what is symbol for oxidizing agent ?

Answer 29

[O]

Question 30

atom economy =

Answer 30

Mr of useful products / Mr of all products

Question 31

what do the roman numerals show ?

Answer 31

oxidation number (of the metal)