Paper 1 Flashcards
The company calculates that 500 g of titanium dioxide should produce 1.2 kg of
titanium chloride.
However, the company finds that 500 g of titanium dioxide only produces 900 g of
titanium chloride.
Calculate the percentage yield.
900 ÷ 1200 × 100 = 75(%)
fill in the missing gaps with these words
electron ion neutron
nucleus proton
The centre of the atom is the .
The two types of particle in the centre of the atom are the proton
and the .
James Chadwick proved the existence of the .
Niels Bohr suggested particles orbit the centre of the atom. This type of particle
is the .
The two types of particle with the same mass are the neutron
and the
nucleus neutron neutron electron proton
must be in this order
The solution contains a substance with the formula NaOH box
Give the name of the substance.
sodium hydroxide
A solution of NaOH had a concentration of 40 g/dm3
What mass of NaOH would there be in 250 cm3 of the solution
(
250
1000
× 40 =) 10 (g)
Describe a method to make pure, dry crystals of magnesium sulfate from a metal
oxide and a dilute acid.
use magnesium oxide and sulfuric acid • add sulfuric acid to a beaker • warm sulfuric acid • add magnesium oxide • stir • continue adding until magnesium oxide is in excess • filter • using a filter paper and funnel • to remove excess magnesium oxide • heat solution in an evaporating basin • to crystallisation point • leave to crystallise • pat dry with filter paper
An atom of iron is represented as 26Fe 56
Give the number of protons, neutrons and electrons in this atom of iron.
[3 marks]
Number of protons
Number of neutrons
Number of electrons
26
30
26
must be in his order
Iron is a transition metal.
Sodium is a Group 1 metal.
Give two differences between the properties of iron and sodium
any two from: • iron has a high(er) melting / boiling point • iron is dense(r) • iron is hard(er) • iron is strong(er) • iron is less reactive • iron has ions with different charges • iron forms coloured compounds • iron can be a catalyst
Nickel is extracted from nickel oxide by reduction with carbon. box
Explain why carbon can be used to extract nickel from nickel oxide.
carbon is more reactive (than
nickel)
An equation for the reaction is:
NiO + C Ni + CO
Calculate the percentage atom economy for the reaction to produce nickel.
Relative atomic masses (Ar): C = 12 Ni = 59
Relative formula mass (Mr): NiO = 75
Give your answer to 3 significant figures.
=59÷ 87 ×100
= 67.8 (%)
Alkaline batteries are non-rechargeable. box
Why do alkaline batteries eventually stop working?
a reactant is used up
Why can alkaline batteries not be recharged?
the reaction is not reversible
Hydrogen fuel box cells and rechargeable lithium-ion batteries can be used to power
electric cars.
Complete the balanced equation for the overall reaction in a hydrogen fuel cell.
H2 + H2O
2H2 + O2 → 2H2O
2 Calcium nitrate contains the ions Ca2+ and NO3
–
Give the formula of calcium nitrate.
Ca(NO3)2
This question is about elements in Group 1.
A teacher burns sodium in oxygen.
Complete the word equation for the reaction.
sodium + oxygen
sodium oxide
The student concluded that the reactions between the metals and copper sulfate box
solution are endothermic.
Give one reason why this conclusion is not correct.
temperature increases
