chemistry revision

Question 1

what is the atomic number

Answer 1

the number of protons

Question 2

the mass number is?…

Answer 2

the number of protons + neutrons

Question 3

what is an isotope?

Answer 3

something that has the same number of protons as that defines the element, and different numbers of neutrons.

Question 4

what is the configuration for 16 electrons in shells

Answer 4

2,8,6

Question 5

what are the sections on the periodic table

Answer 5

left - metal, right - gas, between - semi-metals

Question 6

how many types of atom does a compound have?

Answer 6

2 or more

Question 7

what is CuSO4?

Answer 7

copper sulphate

Question 8

what is lithiums reaction to oxygen?

Answer 8

goes dull

Question 9

what is sodiums reaction with oxygen

Answer 9

went dull quickly

Question 10

what is potassiums reaction with oxygen

Answer 10

went dull fastest

Question 11

what is lithiums reaction with water?

Answer 11

fizzed, floated, moved and dissolved

Question 12

what is sodiums reaction with water?

Answer 12

fizzed, floated, moved around, melted into a ball

Question 13

what is potassiums reaction to water?

Answer 13

exploded, floated, sparked into a lilac flame, moved quickly around/

Question 14

which group seven metal is the most reactivve with the air?

Answer 14

francium

Question 15

why are the elements at the bottom of group 7 the most reactive?

Answer 15

the electrons are further from the nucleus, theres a lower attraction.

Question 16

what are the main three halogens?

Answer 16

chlorine, bromine, iodine

Question 17

what are chloride and bromide’ reactions to the silver nitrate test?

Answer 17

cloudy white with a white precipitate

Question 18

what are the flame colours for the following elements in order: lithium, sodium, potassium, calcium, barium

Answer 18

brick red, orange, lilac, orange/yellow, pale green.

Question 19

as we go down group 1 the density…

Answer 19

increases

Question 20

what are noble gasses

Answer 20

they are unreactive gasses as they have aa full outer shell.

Question 21

what are the four factors affecting collision theory?

Answer 21

surface area, concentration, catalysts, temperature

Question 22

what is the reaction rate equation?

Answer 22

change in amount of substance / time taken

Question 23

what are the three types of water?

Answer 23

hard water, soft water, temporary hard water.

Question 24

how do you purify drinking water?

Answer 24

sedimentation, sand filter, chlorination and storage

Question 25

why is chlorine and flourine added to the water?

Answer 25

to kill bacteria and prevent tooth decay.

Question 26

does nitrate ions make water undrinkable?

Answer 26

yes

Question 27

how do you seperate ethanol and water?

Answer 27

boil the solution at 78 degrees so that the ethanol evaporates and is condensed in a condensing tube and then collected in a beaker.

Question 28

does hard water need more soap to sud?

Answer 28

yes

Question 29

can temporary hard water be boiled into soft water?

Answer 29

yes

Question 30

what substance can change any water in to soft water?

Answer 30

adding sodium carbonate as it displaces other molecules.

Question 31

what was alfred wegners theory?

Answer 31

that all of the continents once fit together

Question 32

what was wegners evidence for his theory?

Answer 32

the plates fit in a jigsaw pattern, there are the same fossil and rock formations on the other side of oceans and no where else.

Question 33

what is wegners super continent?

Answer 33

pangea

Question 34

how does a volcano map relate to tectonic theory.

Answer 34

around where the tectonic plate boundarys are there are earthquakes and volcanoes almost outlining the plates.

Question 35

how to the tectonic plates move?

Answer 35

by convection currents in the mantle.

Question 36

what are the two types of crust?

Answer 36

oceanic and continental.

Question 37

what happens at a constructive plate boundary?

Answer 37

the plates move away from eachother

Question 38

what happens at destructive plate boundarys?

Answer 38

one plate moves under another.

Question 39

what happens at conservative plate boundarys?

Answer 39

the plates move alongside eachother.

Question 40

why does a destructive plate boundary occour?

Answer 40

because one plate is thinner than another so it gets pushed under and melted into magma.

Question 41

what is the gas test for oxygen?

Answer 41

place a glowing splint into a test tube, if oxygen is present the splint will light on fire.

Question 42

what is the test for carbon dioxide?

Answer 42

blow into limewater, if the solution goes cloudy carbon dioxide is present.

Question 43

what is global warming?

Answer 43

the increase of temperature of the surface and atmosphere of the globe.

Question 44

name 3 greenhouse gasses.

Answer 44

carbon dioxide, methane, water vapour.

Question 45

name three causes of greenhouse gas emissions.

Answer 45

deforestation, burning fossil fuels, more people.

Question 46

what are some consiquences of global warming?

Answer 46

ice caps pelting, sea levels rising, freak weather conditions.

Question 47

define thermal decomposition.

Answer 47

the breaking down of substances using heat.

Question 48

name the four 'lime' stages and how you get there.

Answer 48

limestone, take away co2, quicklime, + small bit of water, slaked lime, + water, limewater, + co2, limestone again.

Question 49

limestone removes impurities, makes glass, makes concerete and cement and neutrilises soil. true or false.

Answer 49

true

Question 50

cons of limestone quarrying.

Answer 50

pollution, produces dust, noise pollution.