what substances are shown in the periodic table?
1 of 56
what atom does H represent?
2 of 56
what type of substante is sodium chloride,NaCl?
a compound
3 of 56
why are atoms neutral?
because there are the same number of electrons than protons
4 of 56
how many protons, electron and neutrons are there in an atom of aluminium?
13 protons, 13 electrons and 14 neutrons
5 of 56
explain why nitrogen and phosphorus are both in group 5 in the periodic table?
both have 5 electrons in outer shell
6 of 56
name an example of a compound with ionic bonds?
sodium chloride/magnesium oxide
7 of 56
calcium chloride has the formula CaCl2.What does this tell you about the compound?
made of one calcium ion for every two chloride ion
8 of 56
the formula of propane is C3H8.What does this tell you about propane?
its made from 3 carbon atoms and 8 hydrogen atoms
9 of 56
explain fully about what is balenced in the symbol equation: Mg+2HCl--> MgCl2+H
magnesium reacts with hydrochloric acid to produce magnesium chloride and hydrogen
10 of 56
balance the equation: Na+O--> Na2O
11 of 56
list ways in which limestone and products made from limestone are used in building?
building blocks,to make calcium oxide, to make cement
12 of 56
what are the products when zinc carbonate is heated strongly?
zinc oxide are carbon dioxide
13 of 56
what is the word equestion for the reaction of magnesium carbonate with hydrochloric acid?
magnesium carbonate+hydrochloric acid--> magnesium chloride+carbon dioxide+water
14 of 56
what are the three word equestions for the limestone cycle?
1.calcium carbonate--> calcium oxide+carbon dioxide .2.calcium oxide+water--> calcium hydroxide .3.calcium hydroxide+carbon dioxide--> calcium carbonate+water
15 of 56
what is the difference between cement,mortar and concrete?
cement is made of limestone and clay.mortar is cement mixed with sand.concreat is cement mixed with sand
16 of 56
what are three advantages for limestone quarying?
more employment opportunities,improved roads,more customers
17 of 56
what is an ore?
rock from which metal can be extracted economically
18 of 56
name two metals that have oxides that can be reduced by carbon?
zinc,iron,tin,lead,copper (any two are alloud)
19 of 56
why does iron from the blast furnace have only a few uses?
it is brittle
20 of 56
why are steels more useful than pure iron?
they are harder
21 of 56
why is it expensive to extract aluminium from its ore?
requires alot of energy
22 of 56
why is titanium a very useful metal for making aircraft engines?
it is strong ,resists corrosion and has a low density
23 of 56
why are new ways of extracting copper being researched?
high grade ores are limited or running out
24 of 56
what three ways can be used to produce copper metal from its compound
25 of 56
what properties make transition metals useful materials for making things?
strong,good conductor of heat and energy
26 of 56
what properties are needed for electrical wiring?
can be bent,not brittle
27 of 56
why is gold used for wedding rings mixed with other metals?
makes it harder
28 of 56
why should we recycle aluminium cans?
save energy,resourses,fossil fuels,land
29 of 56
what are fractions?
liquids with different boiling ranges seperated from a mixture of liquids
30 of 56
how can you tell that the substance with the formula C5H12 is an alkane?
it is a seperated compound
31 of 56
what is the molecular formula of butane?
32 of 56
why are different hydrocarbons collected at different levels of a fractional distillation column?
different hydrocarbons have different boiling points
33 of 56
what properties would you expect for a fraction that is collected one-third of the way up a fractionating colum?
medium-high boiling(about 250),quite viscous
34 of 56
name 4 possible products of the incomplete combustion of a hydrocarbon?
carbon monoxide,carbon,unburnt hydrocarbon, water
35 of 56
what environmental problem is caused by sulfur dioxide and nitrogen oxide?
acid rain
36 of 56
name the product of incomplete combustion that scientists believe caused global dimming?
37 of 56
what two methods are used to reduce the amount of sulfur dioxide produced by burning fuels?
remove sulfur dioxide from watse gases
38 of 56
give 1 advantage and 1 disadvantage of hydrogen as a fuel?
no pollotion(advantage) requires large amount of energy(disadvantage)
39 of 56
give one reason why an oil company might want to crack large hydrocarbons to make smaller alkanes?
to make fuels that are more useful
40 of 56
how are polymers made?
from many small molecules or monomers that react or join together
41 of 56
what is a shape-memory polymer?
a type of smart polymer
42 of 56
describe the two ways that cornstartch can be used to help with problems of disposal of plastic waste?
it can be added added to plastics made from non-biogradable polymers so they break down into small pieces
43 of 56
what two methods are used to extract vegetable oils?
pressing and distillastion
44 of 56
why are vegetables oils important foods?
they provide energy and nutrients
45 of 56
what is the difference between unstaturated fats and saturated?
saturated have a single bond and unsaturated have a double bond
46 of 56
what is ment by hardening vegetable oils?
During hydrogenation, vegetable oils are hardened by reacting them with hydrogen gas at about 60ºC.
47 of 56
what is an emulsifier?
substance that stops oils and water from seperating
48 of 56
how can you reconise an emulsion?
cannot see through them
49 of 56
why causes tectonic plates to move?
convection currents caused by heating of the mantel
50 of 56
why can scientists not predict when and where an earthquake will happen?
we do not know enough about what is happening inside the earth
51 of 56
why were wegner's ideas not accepted for many years
he couldnt explain why the continents moved
52 of 56
where did most of the C02,N and H20 vapour in the earths early atmosphere come from?
53 of 56
why are we not sure about how life began?
there is not evidence
54 of 56
why can the gasses in the air be seperated by fractional distillation?
its a mixture of different substances
55 of 56
name two processes that release carbon dioxide into the stmosphere and two processes that remove it from the atmosphere?
respiration and decay
56 of 56

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Card 2


what atom does H represent?



Card 3


what type of substante is sodium chloride,NaCl?


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Card 4


why are atoms neutral?


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Card 5


how many protons, electron and neutrons are there in an atom of aluminium?


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