AQA GCSE Chemistry Paper 1 Exam
|Questions And Answers |100%
Guaranteed Pass |Latest Exam 2026-
2027|Graded A+
What is an atom? -ANSWERSmallest part of an element that can exist
What is an element? -ANSWERA substance made up of one type of atom
How are elements represented? -ANSWERUsing symbols, in the periodic table
Approximately how many elements are there? -ANSWER100
What is a compound? -ANSWERA substance made up of two or more elements
chemically combined in fixed proportions
How are the elements in a compound separated? -ANSWERBy chemical reaction
How are chemical reactions represented? -ANSWERBy word or symbol equations
Which group of the periodic table includes sodium and potassium? -ANSWERGroup 1,
alkali metals
Which group of the periodic table includes chlorine, bromine and iodine? -
ANSWERGroup 7, halogens
Which group of the periodic table includes helium, neon and argon? -ANSWERGroup 0,
noble gases
What information does a chemical formula provide? -ANSWERWhich elements are
bonded together, and how many atoms of each are present
What is a mixture? -ANSWERTwo or more elements or compounds not chemically
bonded together
Which separation technique is used to separate a mixture of two liquids? -
ANSWERDistillation
Which separation technique is used to separate a mixture of more than two liquids? -
ANSWERFractional distillation
,Which separation technique is used to separate an insoluble solid and a liquid? -
ANSWERFiltration
Which separation technique is used to separate a mixture of coloured substances? -
ANSWERChromatography
Which separation technique is used to separate a soluble solid from its solution? -
ANSWERCrystallisation
Before the discovery of the electron what were atoms thought to be? -ANSWERTiny
spheres that could not be divided
What is the 'plum pudding' model of the atom? -ANSWERBall of positive charge with
negative electrons embedded in it
What experiment led to the development of the nuclear model? -ANSWERRutherford's
alpha particle scattering experiment
What happened to the alpha particles fired at thin gold foil in Rutherford's scattering
experiment? -ANSWERMost alpha particles went straight through, but a few were
scattered
What is the 'nuclear' model of the atom that Rutherford developed that replaced the
'plum pudding' model? -ANSWERMass of the atom is in the centre (nucleus) and the
nucleus was positively charged
Who proposed that electrons orbit the nucleus at specific distances? -ANSWERNiels
Bohr
What name was given to the positive particles in the nucleus? -ANSWERProtons
What did James Chadwick discover? -ANSWERNeutrons
In what order were the subatomic particles discovered? -ANSWERElectron, proton,
neutron
What is the relative charge on a proton? -ANSWER+1 (positive 1)
What is the relative charge on a neutron? -ANSWER0 (no charge)
What is the relative charge on an electron? -ANSWER-1 (negative 1)
Why are atoms electrically neutral? -ANSWERNumber of protons = number of electrons
What name is given to the number of protons in an atom of an element? -
ANSWERAtomic number
, What does the atomic number (number of protons) determine? -ANSWERThe element.
Atoms of a particular element have the same number of protons
What is the approximate size of an atom? -ANSWER0.1 nm (1 x 10-10 m)
What is the approximate radius of a nucleus? -ANSWER1 x 10-14 m
Where is almost all the mass of an atom? -ANSWERIn the nucleus
What is the relative mass of a proton? -ANSWER1
What is the relative mass of a neutron? -ANSWER1
What is the relative mass of an electron? -ANSWERVery small / negligible
What name is given to the sum of the number of protons and neutrons? -ANSWERMass
number
What are isotopes? -ANSWERAtoms of the same element with different numbers of
neutrons (same number of protons)
What is relative atomic mass, Mr, of an element? -ANSWERAverage mass of an
element's atoms, compared to 1/12th the mass of a carbon-12 atom
How is Mr calculated? -ANSWERMr = (Ar 1 x abundance 1)/100 + (Ar 2 x abundance
2)/100
What is the 'electronic structure' of an atom? -ANSWERShows where in the atoms the
electrons are situated
How is the electronic structure of an atom represented? -ANSWERBy numbers or a
diagram
Where is the lowest energy level in an atom? -ANSWERNearest the nucleus
How many electrons are needed to fill the lowest energy level in an atom? -ANSWER2
How many electrons are needed to fill the second lowest energy level in an atom? -
ANSWER8
How many electrons are needed to fill the third lowest energy level in an atom? -
ANSWER8
How are the elements arranged in the periodic table? -ANSWERIn order of increasing
atomic number
|Questions And Answers |100%
Guaranteed Pass |Latest Exam 2026-
2027|Graded A+
What is an atom? -ANSWERSmallest part of an element that can exist
What is an element? -ANSWERA substance made up of one type of atom
How are elements represented? -ANSWERUsing symbols, in the periodic table
Approximately how many elements are there? -ANSWER100
What is a compound? -ANSWERA substance made up of two or more elements
chemically combined in fixed proportions
How are the elements in a compound separated? -ANSWERBy chemical reaction
How are chemical reactions represented? -ANSWERBy word or symbol equations
Which group of the periodic table includes sodium and potassium? -ANSWERGroup 1,
alkali metals
Which group of the periodic table includes chlorine, bromine and iodine? -
ANSWERGroup 7, halogens
Which group of the periodic table includes helium, neon and argon? -ANSWERGroup 0,
noble gases
What information does a chemical formula provide? -ANSWERWhich elements are
bonded together, and how many atoms of each are present
What is a mixture? -ANSWERTwo or more elements or compounds not chemically
bonded together
Which separation technique is used to separate a mixture of two liquids? -
ANSWERDistillation
Which separation technique is used to separate a mixture of more than two liquids? -
ANSWERFractional distillation
,Which separation technique is used to separate an insoluble solid and a liquid? -
ANSWERFiltration
Which separation technique is used to separate a mixture of coloured substances? -
ANSWERChromatography
Which separation technique is used to separate a soluble solid from its solution? -
ANSWERCrystallisation
Before the discovery of the electron what were atoms thought to be? -ANSWERTiny
spheres that could not be divided
What is the 'plum pudding' model of the atom? -ANSWERBall of positive charge with
negative electrons embedded in it
What experiment led to the development of the nuclear model? -ANSWERRutherford's
alpha particle scattering experiment
What happened to the alpha particles fired at thin gold foil in Rutherford's scattering
experiment? -ANSWERMost alpha particles went straight through, but a few were
scattered
What is the 'nuclear' model of the atom that Rutherford developed that replaced the
'plum pudding' model? -ANSWERMass of the atom is in the centre (nucleus) and the
nucleus was positively charged
Who proposed that electrons orbit the nucleus at specific distances? -ANSWERNiels
Bohr
What name was given to the positive particles in the nucleus? -ANSWERProtons
What did James Chadwick discover? -ANSWERNeutrons
In what order were the subatomic particles discovered? -ANSWERElectron, proton,
neutron
What is the relative charge on a proton? -ANSWER+1 (positive 1)
What is the relative charge on a neutron? -ANSWER0 (no charge)
What is the relative charge on an electron? -ANSWER-1 (negative 1)
Why are atoms electrically neutral? -ANSWERNumber of protons = number of electrons
What name is given to the number of protons in an atom of an element? -
ANSWERAtomic number
, What does the atomic number (number of protons) determine? -ANSWERThe element.
Atoms of a particular element have the same number of protons
What is the approximate size of an atom? -ANSWER0.1 nm (1 x 10-10 m)
What is the approximate radius of a nucleus? -ANSWER1 x 10-14 m
Where is almost all the mass of an atom? -ANSWERIn the nucleus
What is the relative mass of a proton? -ANSWER1
What is the relative mass of a neutron? -ANSWER1
What is the relative mass of an electron? -ANSWERVery small / negligible
What name is given to the sum of the number of protons and neutrons? -ANSWERMass
number
What are isotopes? -ANSWERAtoms of the same element with different numbers of
neutrons (same number of protons)
What is relative atomic mass, Mr, of an element? -ANSWERAverage mass of an
element's atoms, compared to 1/12th the mass of a carbon-12 atom
How is Mr calculated? -ANSWERMr = (Ar 1 x abundance 1)/100 + (Ar 2 x abundance
2)/100
What is the 'electronic structure' of an atom? -ANSWERShows where in the atoms the
electrons are situated
How is the electronic structure of an atom represented? -ANSWERBy numbers or a
diagram
Where is the lowest energy level in an atom? -ANSWERNearest the nucleus
How many electrons are needed to fill the lowest energy level in an atom? -ANSWER2
How many electrons are needed to fill the second lowest energy level in an atom? -
ANSWER8
How many electrons are needed to fill the third lowest energy level in an atom? -
ANSWER8
How are the elements arranged in the periodic table? -ANSWERIn order of increasing
atomic number
