# 9 Elite T3 Exam Revision

## Quiz by Alix

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29 questions
• Q1
6.20x10³
6.02x10²³
-6.02x10²³
6.02-10²³
30s
• Q2
If you have been given the number of moles but you want to work out the number of particles you have to...
30s
• Q3
Calculate the number of particles in 1 mole of CO
6.02x10-²³
12.04 x10²³
6.02 x10²³
3.01 x10²³
30s
• Q4
What is molar mass?
The mass of a particle in a mole
How many molecules are together in a mole
How many atoms are in one mole. Sometimes seen as Mm
The mass of one mole of a substance. Sometimes seen as Mr
30s
• Q5
Imagine we need 3 mol of copper (Cu) for a chemical reaction, how would you know the mass of copper to measure out? (Mr of Cu = 63.546)
6.02 x10
19.0 g
191g
0.0472g
30s
• Q6
How many moles of fluorine atoms are in 4 moles of Dichlorodifluoromethane (CCl₂F₂)?
6
4
8
2
30s
• Q7
How many moles of Oxygen would we have in 5.5 moles of CuSO₄?
1
11
4
22
30s
• Q8
What is the molar mass of NaCl? (Mr of Na = 22.99, Mr of Cl = 35.45)
55.44 g/mol
23 g/mol
58.44g/mol
59 g/mol
30s
• Q9
Calculate the mass of 3.5 mol of CCl₂F₂. (Mr of CCl₂F₂ = 120.907g/mol)
423.175 g
423
3.5 g
0.0289 g
30s
• Q10
How do you work out moles of a substance from the mass and molar mass?
Moles = Mass x Mr x 100
Moles = Mass/Mm
Moles = Mass/Mr
Moles = Mass x Mr
30s
• Q11
Define Empirical formula
A chemical formula of compound with the largest whole number ratio of atoms of each element in the compound.
A chemical formula of compound with the simplest whole number ratio of atoms of each element in the compound.
A chemical formula of compound with an even number of elements in a compound
30s
• Q12
How do you calculate percentage by mass?
(mass of element / mass of compound) x 100
(mass of element / mass of compound) /100
(mass of element x mass of compound) x 100
30s
• Q13
If we have a compound ABC, it weights in total 200g. A weighs 50g, B weights 140g and C weights 10g. What are the percentages by mass of A,B and C?
25%, 70% and 5%
40%, 50% and 10%
25%, 85% and 10%
30s
• Q14
What is the empirical formula of H₂0
H₂0₂
2H₂O
H₂0
HO
30s
• Q15
Name: CoCl₂ • 6H₂O
Cobalt (II) chlorine hexahydrate
Cobalt (II) chloride pentahydrate
Cobalt (II) chloride hexahydrate
30s

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