CHEMISTRY A HIGHER TIER ALL ASSESSMENTS
EXAM-STYLE QUESTIONS AND MODEL
ANSWERS
◉ What is an element? Answer: A substance made up of one type of
atom
◉ How are elements represented? Answer: Using symbols, in the
periodic table
◉ Approximately how many elements are there? Answer: 100
◉ What is a compound? Answer: A substance made up of two or
more elements chemically combined in fixed proportions
◉ How are the elements in a compound separated? Answer: By
chemical reaction
◉ How are chemical reactions represented? Answer: By word or
symbol equations
◉ Which group of the periodic table includes sodium and
potassium? Answer: Group 1, alkali metals
,◉ Which group of the periodic table includes chlorine, bromine and
iodine? Answer: Group 7, halogens
◉ Which group of the periodic table includes helium, neon and
argon? Answer: Group 0, noble gases
◉ What information does a chemical formula provide? Answer:
Which elements are bonded together, and how many atoms of each
are present
◉ What is a mixture? Answer: Two or more elements or compounds
not chemically bonded together
◉ Which separation technique is used to separate a mixture of two
liquids? Answer: Distillation
◉ Which separation technique is used to separate a mixture of more
than two liquids? Answer: Fractional distillation
◉ Which separation technique is used to separate an insoluble solid
and a liquid? Answer: Filtration
,◉ Which separation technique is used to separate a mixture of
coloured substances? Answer: Chromatography
◉ Which separation technique is used to separate a soluble solid
from its solution? Answer: Crystallisation
◉ Before the discovery of the electron what were atoms thought to
be? Answer: Tiny spheres that could not be divided
◉ What is the 'plum pudding' model of the atom? Answer: Ball of
positive charge with negative electrons embedded in it
◉ What experiment led to the development of the nuclear model?
Answer: Rutherford's alpha particle scattering experiment
◉ What happened to the alpha particles fired at thin gold foil in
Rutherford's scattering experiment? Answer: Most 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? Answer: Mass of the atom
is in the centre (nucleus) and the nucleus was positively charged
, ◉ Who proposed that electrons orbit the nucleus at specific
distances? Answer: Niels Bohr
◉ What name was given to the positive particles in the nucleus?
Answer: Protons
◉ What did James Chadwick discover? Answer: Neutrons
◉ In what order were the subatomic particles discovered? Answer:
Electron, proton, neutron
◉ What is the relative charge on a proton? Answer: +1 (positive 1)
◉ What is the relative charge on a neutron? Answer: 0 (no charge)
◉ What is the relative charge on an electron? Answer: -1 (negative
1)
◉ Why are atoms electrically neutral? Answer: Number of protons =
number of electrons
◉ What name is given to the number of protons in an atom of an
element? Answer: Atomic number
EXAM-STYLE QUESTIONS AND MODEL
ANSWERS
◉ What is an element? Answer: A substance made up of one type of
atom
◉ How are elements represented? Answer: Using symbols, in the
periodic table
◉ Approximately how many elements are there? Answer: 100
◉ What is a compound? Answer: A substance made up of two or
more elements chemically combined in fixed proportions
◉ How are the elements in a compound separated? Answer: By
chemical reaction
◉ How are chemical reactions represented? Answer: By word or
symbol equations
◉ Which group of the periodic table includes sodium and
potassium? Answer: Group 1, alkali metals
,◉ Which group of the periodic table includes chlorine, bromine and
iodine? Answer: Group 7, halogens
◉ Which group of the periodic table includes helium, neon and
argon? Answer: Group 0, noble gases
◉ What information does a chemical formula provide? Answer:
Which elements are bonded together, and how many atoms of each
are present
◉ What is a mixture? Answer: Two or more elements or compounds
not chemically bonded together
◉ Which separation technique is used to separate a mixture of two
liquids? Answer: Distillation
◉ Which separation technique is used to separate a mixture of more
than two liquids? Answer: Fractional distillation
◉ Which separation technique is used to separate an insoluble solid
and a liquid? Answer: Filtration
,◉ Which separation technique is used to separate a mixture of
coloured substances? Answer: Chromatography
◉ Which separation technique is used to separate a soluble solid
from its solution? Answer: Crystallisation
◉ Before the discovery of the electron what were atoms thought to
be? Answer: Tiny spheres that could not be divided
◉ What is the 'plum pudding' model of the atom? Answer: Ball of
positive charge with negative electrons embedded in it
◉ What experiment led to the development of the nuclear model?
Answer: Rutherford's alpha particle scattering experiment
◉ What happened to the alpha particles fired at thin gold foil in
Rutherford's scattering experiment? Answer: Most 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? Answer: Mass of the atom
is in the centre (nucleus) and the nucleus was positively charged
, ◉ Who proposed that electrons orbit the nucleus at specific
distances? Answer: Niels Bohr
◉ What name was given to the positive particles in the nucleus?
Answer: Protons
◉ What did James Chadwick discover? Answer: Neutrons
◉ In what order were the subatomic particles discovered? Answer:
Electron, proton, neutron
◉ What is the relative charge on a proton? Answer: +1 (positive 1)
◉ What is the relative charge on a neutron? Answer: 0 (no charge)
◉ What is the relative charge on an electron? Answer: -1 (negative
1)
◉ Why are atoms electrically neutral? Answer: Number of protons =
number of electrons
◉ What name is given to the number of protons in an atom of an
element? Answer: Atomic number
