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Question 1

what is a chemical reaction

Answer 1

it’s a change of what the atom is bonded too

Question 2

what’s an element

Answer 2

a substance containing only one type of atom

Question 2

what’s a compound

Answer 2

a substance containing 2 or more atoms chemically bonded

Question 3

what’s a mixture

Answer 3

a substance containing 2 or more atoms that are not chemically bonded

Question 4

can atoms be created and destroyed?

Answer 4

no

Question 5

what’s filtration

Answer 5

the removal of large insoluble particles from a solvent

Question 6

what’s evaporation

Answer 6

leaves behind crystals of dissolved substance is heated gently

Question 7

what’s distillation

Answer 7

condensing the evaporated solvent and collecting it

Question 8

what’s fractional distillation

Answer 8

separating liquids due to their different boiling points

Question 9

what’s chromatography

Answer 9

causes substances to rise up paper due to capillary action

Question 10

what’s the process of going from a solid to liquid

Answer 10

melting

Question 11

what’s the process of going from a gas to liquid

Answer 11

condensing

Question 12

what’s the process of going from a solid to gas

Answer 12

sublimation

Question 13

is changing the state of a particle chemical or physical

Answer 13

physical

Question 14

what are the traits of a solid

Answer 14

particles in a regular lattice arrangement and vibrate around fixed positions
cannot be compressed

Question 15

what are the traits of a liquid

Answer 15

particles have no regular arrangement and are able to move past eachother
cannot be compressed

Question 16

what are the traits of a gas

Answer 16

particles are far apart and move randomly at high speeds
can be compressed

Question 17

why can gases move at high speeds

Answer 17

high kinetic energy

Question 18

what did Thomson create

Answer 18

plum pudding model

Question 19

what is the plum pudding model

Answer 19

a ball of positive charge with negative balls dotted around

Question 20

what did Rutherford create

Answer 20

‘alpha particle model’
the theory that the nucleus was small and positively charged

Question 21

what did Bohr think

Answer 21

electrons exist in shells

Question 22

what did Chadwick think

Answer 22

nucleus has neutrons as well as protons

Question 23

what’s the atomic number

Answer 23

number of protons in the nucleus

Question 24

what's the mass number

Answer 24

total number of protons and neutrons

Question 25

what are isotopes

Answer 25

same number of protons with different number of neutrons

Question 26

how to work out relative abundance

Answer 26

(massxpercent)(massxpercent)/100

Question 27

what did Mendeleev do

Answer 27

based periodic table on properties he left gaps in the table for elements that hadn't been discovered yet

Question 28

do metals donate or lose electrons

Answer 28

donate

Question 29

what type of ions do metals form

Answer 29

positive

Question 30

do non metals lose or donate electrons

Answer 30

lose

Question 31

what type of ions do non metals form

Answer 31

negative

Question 32

what does the group number tell you

Answer 32

how many electrons are in the outer shell

Question 33

alkali metals

Answer 33

lose outer electron ion 1 + get more reactive down the group electrostatic force is weaker

Question 34

Halogens

Answer 34

They need 1 to gain an outer shell They get less reactive down the group and their boiling points increase