WorksheetsGCSE AQA Chemistry Paper 2 (1)
Total questions: 30
Worksheet time: 18mins
Why does a higher concentration increase the rate of reaction?
It lowers the activation energy
It increases the frequency of collision
It increases the energy of reactant particles
It increases the amount of reactants
Which factors increase the rate of a reaction?
Increasing temperature
Increasing concentration
Increasing total surface area
All of these
Which TWO statements are correct when the reaction reaches equilibrium?
The forward reaction and reverse reaction are both exothermic.
The gases have escaped from the container.
The hydrogen no longer reacts with iodine.
The mass of each substance does not change.
The rates of the forward reaction and reverse reaction are equal.
Which of the following is false about a catalyst?
increases the rate of reaction
does not alter the products of the reaction
is not chemically or used up at the end of the reaction
affects the equilibrium
Name the type of reaction that transfers energy from reactants to the environment.
(a)
Which of the factors will NOT shift a reaction in equilibrium?
Volume
Concentration
Pressure
Surface area
What name is given to the minimum amount of energy needed by particles for them to react when they collide?
Activation energy
Catalytic energy
Threshold energy
Collision energy
What is the general formula for alkanes?
CnH2n+2
CnHn+2
C2nH2n+2
CnH3n+2
Which alkane has the structure shown in the image?
Methane
Propane
Ethane
Butane
Why are alkanes saturated hydrocarbons?
they are compounds containing carbon and oxygen
joined by C-C double bonds
they are compounds containing oxygen and hydrogen
the carbon atoms are joined by C-C single bonds
The general formula for alkanes is CnH2n+2. If an alkane contains 6 carbon atoms, how many hydrogen atoms are present?
6
12
14
18
Ethanol can be oxidised to ethanoic acid when heated with acidified potassium dichromate (K₂Cr₂O₇/H⁺) – an oxidising agent.
What is the correct equation for this reaction?
CH₃CH₂OH + [O] → CH₃CH₂COOH + H₂O
CH₃CH₂OH + 2[O] → CH₃COOH + H₂O
CH₃CH₂OH + [O] → CH₃CH₂COOH
CH₃CH₂OH + [K₂Cr₂O₇/H⁺] → CH₃CH₂COOH
Why does ethanol have a lower boiling point than water?
the -OH groups in the ethanol molecules have a tendency to cling together
the attraction between the molecules is weaker
the ethanol molecules can easily lose a hydrogen atom
the ethanol molecules mix well with water
What is the product of an incomplete combustion?
Carbon dioxide and/or carbon+ water
Carbon oxide+ water
Carbon monoxide and/or carbon + water
Hydrogen oxide and carbon
arboxylic acids can be reacted with alcohols in the presence of an acid catalyst to make an ester.
Name the ester formed by the reaction of butanol and propanoic acid.
Propyl butoxide
Butyl propoxide
Propyl butanoate
Butyl propanoate
DNA is an example of a biological polymer.
What is the name of the monomers that make DNA?
Monosaccharides
Amino acids
Alkene
Nucleotide
The first step in making proteins from amino acids involves making shorter polymer chains.
What are they called?
Polyamino acids
Polysaccharides
Polypeptides
Polyproteins
What is the functional group of alcohols?
OH
COOH
CO
COO
Which of the following formulae is for a carboxylic acid?
C2H4
C2H5OH
C4H8O2
C2H5COOH
Which TWO substances are mixtures?
Air
Sodium Chloride
Steel
Graphite
Carbon dioxide
A student tested a metal chloride solution with sodium hydroxide solution.
A brown precipitate formed.
What was the metal ion in the metal chloride solution?
Copper(II)
Calcium
Iron(II)
Iron(III)
What type of chemical substance does carbon dioxide belong to?
Pure compound
Mixture of elements
Mixture of compounds
Pure element
What is a mixture?
consist of two or more different substances, chemically joined together
consists of one or more different substances, chemically joined together
consists of two or more different substances, not chemically joined together
consists only of one compound
Which characteristic do pure substances have on a cooling curve?
don't melt at all
Gradual fall in temperature
Slow cooling rates
Sharp melting point
what is the name of the mixture that is designed to do something useful?
Heterogeneous
Cosmetic
Emulsion
Formulation
Which is the correct description of these particles?
A mixture of elements
A mixture of compounds
A mixture of elements and compounds
A mixture in a compound
What state must a splint be in when testing for hydrogen?
Lit
Extinguished
Roaring
Glowing
When testing for oxygen, what marks that the oxygen is indeed present?
Litmus paper changes colour
Lime water turns cloudy
A "squeaky pop" sound is produced
Glowing splint relights
What colour flame does Lithium ions burn with?
Crimson
Yellow
Green
Lilac
What colour flame does Lithium ions burn with?
Crimson
Yellow
Green
Lilac
