GCSE CHEMISTRY TRIPLE SCIENCE EXAM REVISION QUESTIONS
WITH VERIFIED SOLUTIONS LATEST 2025 UPDATE.
What does 'aq' mean? - ANSWER- Aqueous - it is dissolved in water
Water - formula - ANSWER- H20
Ammonia - formula - ANSWER- NH3
Carbon Dioxide - formula - ANSWER- CO2
Hydrogen - formula - ANSWER- H2
Chlorine - formula - ANSWER- Cl2
Oxygen - formula - ANSWER- O2
Ammonium (ion) - formula - ANSWER- NH4 (+)
Hydroxide (ion) - formula - ANSWER- OH (-)
Nitrate (ion) - formula - ANSWER- NO3 (-)
Carbonate (ion) - formula - ANSWER- CO3 (2-)
Sulfate (ion) - formula - ANSWER- SO4 (2-)
,What do you leave out of an ionic equation? - ANSWER- Spectator ions - ions that do not
change in the reaction
What does the 'Oxidising' symbol look like and what does it mean? - ANSWER- Provides
oxygen which allows materials to burn more fiercely
What does the 'Environmental Hazard' symbol look like and what does it mean? - ANSWER-
Harmful to organisms and the environment
What does the 'Toxic' symbol look like and what does it mean? - ANSWER- Can cause death
e.g. by swallowing, breathing in, absorption through skin
What does the 'Harmful' symbol look like and what does it mean? - ANSWER- Can cause
irritation e.g. blistering of the skin
What does the 'Highly Flammable' symbol look like and what does it mean? - ANSWER-
Catches fire easily
What does the 'Corrosive' symbol look like and what does it mean? - ANSWER- Destroys
materials, including living tissues
What is a risk assessment? - ANSWER- The process of detecting hazards and assessing
associated risks in an experiment
What did John Dalton describe atoms as? - ANSWER- 'Solid spheres'
In 1897, what did J J Thompson suggest? - ANSWER- A positively charged 'pudding' with
electrons in was what an atom was
, Who showed that the Plum pudding Model was wrong? - ANSWER- Ernest Rutherford
What was the gold foil experiment? - ANSWER- Rutherford sent a beam of Alpha particles at
a thin piece of gold.
Some of the particles rebounded.
What did the gold foil experiment conclude? - ANSWER- Rutherford concluded that most of
the atom is empty space
The nucleus must be positive as it repels positive particles. He called these protons.
Who made the current atom model? - ANSWER- Niels Bohr
Relative mass of parts of an atom: - ANSWER- Proton: 1, Neutron: 1, Electron: 1/2000
Relative charge of parts of an atom: - ANSWER- Proton: +1, Neutron: 0, Electron: -1
What does the atomic number tell you? - ANSWER- number of protons ( and electrons)
What does the mass number tell you? - ANSWER- total number of protons and neutrons
What are isotopes? - ANSWER- Atoms of the same element with different numbers of neutrons
Define 'Relative Atomic Mass' : - ANSWER- The average mass of an atom compared with 1/12
of the mass of Carbon 12
How can relative atomic mass be written? - ANSWER- A(r)
WITH VERIFIED SOLUTIONS LATEST 2025 UPDATE.
What does 'aq' mean? - ANSWER- Aqueous - it is dissolved in water
Water - formula - ANSWER- H20
Ammonia - formula - ANSWER- NH3
Carbon Dioxide - formula - ANSWER- CO2
Hydrogen - formula - ANSWER- H2
Chlorine - formula - ANSWER- Cl2
Oxygen - formula - ANSWER- O2
Ammonium (ion) - formula - ANSWER- NH4 (+)
Hydroxide (ion) - formula - ANSWER- OH (-)
Nitrate (ion) - formula - ANSWER- NO3 (-)
Carbonate (ion) - formula - ANSWER- CO3 (2-)
Sulfate (ion) - formula - ANSWER- SO4 (2-)
,What do you leave out of an ionic equation? - ANSWER- Spectator ions - ions that do not
change in the reaction
What does the 'Oxidising' symbol look like and what does it mean? - ANSWER- Provides
oxygen which allows materials to burn more fiercely
What does the 'Environmental Hazard' symbol look like and what does it mean? - ANSWER-
Harmful to organisms and the environment
What does the 'Toxic' symbol look like and what does it mean? - ANSWER- Can cause death
e.g. by swallowing, breathing in, absorption through skin
What does the 'Harmful' symbol look like and what does it mean? - ANSWER- Can cause
irritation e.g. blistering of the skin
What does the 'Highly Flammable' symbol look like and what does it mean? - ANSWER-
Catches fire easily
What does the 'Corrosive' symbol look like and what does it mean? - ANSWER- Destroys
materials, including living tissues
What is a risk assessment? - ANSWER- The process of detecting hazards and assessing
associated risks in an experiment
What did John Dalton describe atoms as? - ANSWER- 'Solid spheres'
In 1897, what did J J Thompson suggest? - ANSWER- A positively charged 'pudding' with
electrons in was what an atom was
, Who showed that the Plum pudding Model was wrong? - ANSWER- Ernest Rutherford
What was the gold foil experiment? - ANSWER- Rutherford sent a beam of Alpha particles at
a thin piece of gold.
Some of the particles rebounded.
What did the gold foil experiment conclude? - ANSWER- Rutherford concluded that most of
the atom is empty space
The nucleus must be positive as it repels positive particles. He called these protons.
Who made the current atom model? - ANSWER- Niels Bohr
Relative mass of parts of an atom: - ANSWER- Proton: 1, Neutron: 1, Electron: 1/2000
Relative charge of parts of an atom: - ANSWER- Proton: +1, Neutron: 0, Electron: -1
What does the atomic number tell you? - ANSWER- number of protons ( and electrons)
What does the mass number tell you? - ANSWER- total number of protons and neutrons
What are isotopes? - ANSWER- Atoms of the same element with different numbers of neutrons
Define 'Relative Atomic Mass' : - ANSWER- The average mass of an atom compared with 1/12
of the mass of Carbon 12
How can relative atomic mass be written? - ANSWER- A(r)
