task 1

Question 1

homogenous mixture

Answer 1

2 or more substances forming an evenly distributed mixture

Question 2

heterogeneous mixture

Answer 2

2 or more substances forming an unevenly distributed mixture

Question 3

pure substances

Answer 3

elements and compounds - can not separate

Question 4

physical separation techniques

Answer 4

evaporation, filtration, sieving, chromotography, centrifuge, distillation

Question 5

gravimetric analysis

Answer 5

mass analysis - weighing everything together and individually before and after the experiment

Question 6

properties of metals

Answer 6

shiny, lose electrons in reactions, solids at room temp, malleable and ductile, high melting and boiling point, good heat and electrical conductor

Question 7

properties of non-metals

Answer 7

dull, brittle, gain electrons during reactions, gas at room temp, low melting and boiling point, poor heat and electrical conductor

Question 8

protons

Answer 8

atomic number

Question 9

electrons

Answer 9

atomic number/number of protons

Question 10

neutrons

Answer 10

atomic mass - atomic number

Question 11

isotopes

Answer 11

an atom with the same number of protons and a different number of neutrons. 2 or more different forms of the same element

Question 12

stable isotopes

Answer 12

NO CHANGE, same protons, different neutrons - NO RADIOACTIVE DECAY

Question 13

unstable isotopes

Answer 13

CHANGE, radioactive isotopes, nuclear radiation - natural and man made

Question 14

radioactive isotopes

Answer 14

alpha, beta, gamma

Question 15

most reactive

Answer 15

group 1

Question 16

not reactive

Answer 16

group 8

Question 17

electron configuration

Answer 17

distribution of electrons - valence shells

Question 18

spdf notation

Answer 18

orbitals

Question 19

RAM

Answer 19

relative atomic mass - isotopic composition

Question 20

energy levels

Answer 20

energy electrons can have when in shells - can be excited into higher shells by absorbing energy from surroundings

Question 21

photon

Answer 21

light emited when electrons jump back down to lower shells

Question 22

flame test

Answer 22

metal ion held through bunsen burner flame to help identify

Question 23

barium

Answer 23

apple green

Question 24

copper

Answer 24

liberty green

Question 25

calcium

Answer 25

red organge

Question 26

potassium

Answer 26

purple

Question 27

iron

Answer 27

orange sparkles

Question 28

sodium

Answer 28

banana yellow

Question 29

spectral evidence

Answer 29

flame test, electromagnetic spectrum

Question 30

alpha decay

Answer 30

4 He - stopped by paper - a helium nucleus

2

Question 31

beta decay

Answer 31

0 e - stopped by Al foil - high-speed electron

-1

Question 32

gamma

Answer 32

stopped by a few cm’s of lead - electromagnetic radiation

Question 33

electronegativity

Answer 33

the tendency of an atom to attract electrons

Question 34

atomic radii

Answer 34

the large the radii the more reactive the element - increases down groups, decreases across periods

Question 35

ammonium

Answer 35

+

NH4

Question 36

hydroxide

Answer 36

-

OH

Question 37

carbonate

Answer 37

2-

CO3

Question 38

phosphate

Answer 38

3-

PO4

Question 39

nitrate

Answer 39

-

NO3

Question 40

sulphate

Answer 40

2-

SO4

Question 41

ionic bonding

Answer 41

metal and a non-metal - complete transfer

Question 42

covalent bonding

Answer 42

non-metal and a non-metal - share electrons