AQA GCSE CHEMISTRY - PAPER 1 2025
ACCURATE ANSWERS
What is the charge of a proton? - ANS-+1
What is the charge of a neutron? - ANS-0
What is the charge of an electron? - ANS--1
What is the relative mass of a proton? - ANS-1
What is the relative mass of a neutron? - ANS-1
What is the relative mass of an electron? - ANS-Very small
How many types of atoms do elements contain? - ANS-Only one type
What are compounds? - ANS-Substances containing two or more different elements that are chemically
bonded together
What are mixtures? - ANS-Substances containing two or more different elements that are not chemically
bonded together
What pattern is formed from carrying out paper chromatography? - ANS-Chromatogram
Which method of separation is useful to separate an insoluble solid from a liquid? - ANS-Filtration
,Which method of separation is useful to separate a soluble solid from a liquid? - ANS-Evaporation or
Crystillisation
Which method of distillation separates liquids with similar boiling points? - ANS-Fractional distillation
Who discovered that the plum pudding model was wrong? - ANS-Ernest Rutherford
Who devised an experiment that proved the existence of the neutron? - ANS-Niels Bohr
Why did Mendeleev leave gaps in his Table of Elements? - ANS-To ensure that elements with similar
properties stayed in the same groups. The gaps indicated the existence of undiscovered elements and
allowed Mendeleev to predict what their properties might be
How are the group number and the number of electrons in the outer shell of an element related? - ANS-
The group number tells you how many electrons are in the outer shell of an element. E.g. sodium is in
Group 1 therefore it has 1 electron on its outer shell
What kind of ions do metals form? - ANS-Positive
Where are the non-metals on the periodic table? - ANS-On the right hand side
Give three properties which are specific to transition metals - ANS-1) They can form more than one ion
e.g cobalt form Co2+
2) They are often coloured, therefore compounds which contain them are colourful e.g. potassium
chromate is yellow
3) They often make good catalysts e.g. nickel based catalysts are used in the hydrogenation of alkenes
State three trends as you go down Group 1 - ANS-1) Increased reactivity - the outer electron is more
easily lost as the attraction between the nucleus and the electron decreases because the electron is
further away from the nucleus
2) Lower melting and boiling points
3) Higher relative atomic mass
, What are the products of the reaction of a Group 1 metal and water - ANS-Hydrogen gas and a metal
hydroxide
E.g. sodium + water --> sodium hydroxide + hydrogen
What's the difference between the hardness of Group 1 and transition metals? - ANS-Transition metals
are harder, denser and stronger than Group 1 metals
What's the difference between the reactivity of Group 1 and transition metals? - ANS-Group 1 metals
are much more reactive than transition metals
What's the difference between the melting points of Group 1 and transition metals? - ANS-Transition
metals have higher melting points than Group 1 metals
What trends occur as you go down Group 7? - ANS-1) They become less reactive - it's harder to gain an
extra electron because the outer shell's further from the nucleus
2) They have higher melting and boiling points
3) They have higher relative atomic masses
What is the charge of the ions that halogens form when they react with metals? - ANS-They form
negative ions
What is the trend in boiling point as you go down Group 0? - ANS-The boiling points increase
What subatomic particles does the nucleus contain? - ANS-Protons and neutrons
What is relative atomic mass? - ANS-The mass number which refers to the element as a whole
How are positive ions formed? - ANS-A metal atom loses electrons
How are negative ions formed? - ANS-A non-metal gains electrons
ACCURATE ANSWERS
What is the charge of a proton? - ANS-+1
What is the charge of a neutron? - ANS-0
What is the charge of an electron? - ANS--1
What is the relative mass of a proton? - ANS-1
What is the relative mass of a neutron? - ANS-1
What is the relative mass of an electron? - ANS-Very small
How many types of atoms do elements contain? - ANS-Only one type
What are compounds? - ANS-Substances containing two or more different elements that are chemically
bonded together
What are mixtures? - ANS-Substances containing two or more different elements that are not chemically
bonded together
What pattern is formed from carrying out paper chromatography? - ANS-Chromatogram
Which method of separation is useful to separate an insoluble solid from a liquid? - ANS-Filtration
,Which method of separation is useful to separate a soluble solid from a liquid? - ANS-Evaporation or
Crystillisation
Which method of distillation separates liquids with similar boiling points? - ANS-Fractional distillation
Who discovered that the plum pudding model was wrong? - ANS-Ernest Rutherford
Who devised an experiment that proved the existence of the neutron? - ANS-Niels Bohr
Why did Mendeleev leave gaps in his Table of Elements? - ANS-To ensure that elements with similar
properties stayed in the same groups. The gaps indicated the existence of undiscovered elements and
allowed Mendeleev to predict what their properties might be
How are the group number and the number of electrons in the outer shell of an element related? - ANS-
The group number tells you how many electrons are in the outer shell of an element. E.g. sodium is in
Group 1 therefore it has 1 electron on its outer shell
What kind of ions do metals form? - ANS-Positive
Where are the non-metals on the periodic table? - ANS-On the right hand side
Give three properties which are specific to transition metals - ANS-1) They can form more than one ion
e.g cobalt form Co2+
2) They are often coloured, therefore compounds which contain them are colourful e.g. potassium
chromate is yellow
3) They often make good catalysts e.g. nickel based catalysts are used in the hydrogenation of alkenes
State three trends as you go down Group 1 - ANS-1) Increased reactivity - the outer electron is more
easily lost as the attraction between the nucleus and the electron decreases because the electron is
further away from the nucleus
2) Lower melting and boiling points
3) Higher relative atomic mass
, What are the products of the reaction of a Group 1 metal and water - ANS-Hydrogen gas and a metal
hydroxide
E.g. sodium + water --> sodium hydroxide + hydrogen
What's the difference between the hardness of Group 1 and transition metals? - ANS-Transition metals
are harder, denser and stronger than Group 1 metals
What's the difference between the reactivity of Group 1 and transition metals? - ANS-Group 1 metals
are much more reactive than transition metals
What's the difference between the melting points of Group 1 and transition metals? - ANS-Transition
metals have higher melting points than Group 1 metals
What trends occur as you go down Group 7? - ANS-1) They become less reactive - it's harder to gain an
extra electron because the outer shell's further from the nucleus
2) They have higher melting and boiling points
3) They have higher relative atomic masses
What is the charge of the ions that halogens form when they react with metals? - ANS-They form
negative ions
What is the trend in boiling point as you go down Group 0? - ANS-The boiling points increase
What subatomic particles does the nucleus contain? - ANS-Protons and neutrons
What is relative atomic mass? - ANS-The mass number which refers to the element as a whole
How are positive ions formed? - ANS-A metal atom loses electrons
How are negative ions formed? - ANS-A non-metal gains electrons
