Calculations and Equations GCSE Chemistry AQA (higher)

The actual title for this in the Chemistry AQA revision guide is "How Much" but I changed it because i thought it would be a little confusing.
This is C2.3 in the AQA revision guide.
There are questions on practically (i may have missed one or two) every sentence.
Hope this helps with your revision! 

?
What is the mass of a proton?
1
1 of 34
what is the mass of a neutron?
1
2 of 34
what is the mass of an electron?
very very small
3 of 34
what is the mass number?
protons+neutrons
4 of 34
Atoms of the same element, all have the same number of.............?
Protons
5 of 34
What are atoms of the same element, but with different numbers of neutrons called?
isotopes
6 of 34
The number of neutrons in an atom =
mass number - atomic number
7 of 34
what do we use as a method of weighing atoms?
relative atomic mass
8 of 34
What element do we use as a standard atom to measure everything by?
Carbon 12
9 of 34
What is the relative atomic mass?
the average value of the number of isotopes an element contains.
10 of 34
What is a mole?
the relative formula mass in grams.
11 of 34
What is the relative formula mass?
the relative masses of the atom in the formula added up
12 of 34
How do you calculate the percentage mass?
atomic mass divided by relative formula of compound * 100
13 of 34
How do you calculate the empirical formula?
Divide the mass of an element (in 100g of the compound) by the relative atomic mass, to give the ratios, then convert this to the simplest whole number ratio
14 of 34
calculate the mass of copper oxide that can be made from 10g of copper in the reaction.
12.5
15 of 34
what is the equation for the percentage yield?
amount of product collected divided by maximum amount of product possiblex 100
16 of 34
What is the chemical Yield?
the amount of product made in relation to the amount of product that could have been made
17 of 34
Ammonia is produced........
quickly
18 of 34
What is "atom economy"?
The amount of starting material that ends up in the useful products
19 of 34
How do we work out the atom economy percentage?
relative formula mass of the useful product, divided by relative formula mass of all products x100
20 of 34
To avoid waste, atom economy and percentage yield should be as.......as possible
high
21 of 34
What direction do reversible reactions go?
both directions
22 of 34
In what system can a reversible reaction reach equilibrium?
Closed
23 of 34
Increasing the concentration of a substance increases the rate of reaction......
away from that substance
24 of 34
What process is used to make ammonia?
Haber
25 of 34
What raw materials are used to make ammonia?
Nitrogen and Hydrogen
26 of 34
What is the relative atomic mass?
the top number
27 of 34
What is hydrogen obtained from?
natural gas
28 of 34
at what temperature are the two gasses used to make ammonia passed over the catalyst?
450
29 of 34
At what pressure are the two gasses used to make ammonia passed over the catalyst?
220
30 of 34
The ammonia reaction is.....
reversible
31 of 34
What happens to the gases?
they are cooled
32 of 34
what happens to the unreacted gases in the process of making ammonia?
they are recycled
33 of 34
The yield of the ammonia reaction is.....?
less than 20%
34 of 34

Other cards in this set

Card 2

Front

what is the mass of a neutron?

Back

1

Card 3

Front

what is the mass of an electron?

Back

Preview of the front of card 3

Card 4

Front

what is the mass number?

Back

Preview of the front of card 4

Card 5

Front

Atoms of the same element, all have the same number of.............?

Back

Preview of the front of card 5
View more cards

Comments

sadi

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the one about the pressure catalyst for ammonia, its not 220 its 200

Tulsi Patel

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I agree with Sadi, it is 200 atmospheres.

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