atomic structure and the periodic table

Question 1

what are atoms

Answer 1

atoms are contained in the nucleus are the protons and neutrons .moving around the nucleus are electron shells. they are negativly charged

Question 2

whats an isotope

Answer 2

is an element with the same number of protons but a different number of neutrons the same atomic number but a different mass number

Question 3

whats a compound

Answer 3

is when two or more elements are chemically joined examples of compounds are carbondioxide and magnesium oxide CO2

Question 4

calculation of relative atomic mass

Answer 4

relative atomic mass= sum of( isotope abundance x isotope mass number)/ sum of abundance off all isotopes

Question 5

when balancing equations

Answer 5

their must be the same number of atoms on both sides of the equation

Question 6

mixtures

Answer 6

there are no chemical bonds, so the elements are easy to separate e.g salt water and air

Question 7

chromatography

Answer 7

to separate mixtures

Question 8

filtration

Answer 8

to separate solids from liquids

Question 9

evaporation

Answer 9

to separate a soluable salt from a solution a quick way of separating salt

Question 10

crystalisation

Answer 10

to separate a soluable salt from a solution a slower method of separating a salt

Question 11

quick way to separating out salt

Answer 11

evaporation

Question 12

slow way to separate out salt

Answer 12

crystalisation

Question 13

separating out salt from rock salt steps

Answer 13

1. grind the mixture of salt rock.
2. add water and stir
3. filter the mixture , leaving sand in the filtered paper
4. evaporate the water from the salt leaving the crystals

Question 14

distlation

Answer 14

separate out mixtures of liquids

Question 15

simple distilation

Answer 15

separating a liquid from a solution

Question 16

fractional distilation

Answer 16

separating out a mixture of liquids e.g separate out crude oil into fractions

Question 17

metals and non- metals

Answer 17

found at the left part of periodic table non-metals are on right hand side of table

Question 18

metals

Answer 18

are strong and malleable good conductors of electricity and heat they bond metallically

Question 19

non- metal

Answer 19

are dull brittle and not always solids at room temp

Question 20

who created the plum pudding model

Answer 20

jj tompson

Question 21

what is the plum pudding model and when was it made

Answer 21

plum pudding model was made in 1897 the atom is a ball of charge with electrons scattered

Question 22

hallogens

Answer 22

are non- metal e.g fluroine chlorine bromine iodine as you go down the group they become less reactve

Question 23

noble gasses

Answer 23

group 0 helium neon and argon are un-reactive as they have full outer shells the boiling points all increaseas they go down the group

Question 24

alkali metals

Answer 24

group 1 elements are soft very reactive metals have one electron in outershel making them very reactive low density go down the group they become more reactive and bigger