AQA GCSE Chemistry Paper 1 (Triple)
1. What is the size of an atom's nucleus?
Answer: Approximately 0.1 nanometers in diameter
2. Where is the nucleus located within an atom?
Answer: At the center of the atom
3. What does the nucleus consist of?
Answer: Protons and neutrons
4. What is the charge of a proton?
Answer: Positive
5. What is the charge of an electron?
Answer: Negative
6. What is the mass of an electron?
Answer: Essentially zero
7. What is the charge of a neutral atom?
Answer: Zero
,8. What does the atomic number reveal?
Answer: The number of protons present in an atom
9. What does the mass number indicate?
Answer: The total number of protons and neutrons in an atom
10. Define an element:
Answer: A substance composed of only one type of atom
11. What are isotopes?
Answer: Atoms with the same number of protons but different numbers of neutrons
12. How do compounds form?
Answer: When two or more elements combine chemically
13. What is the composition of compounds formed between metals and non-metals?
Answer: Ions (metal ions and non-metal ions)
14. How do metal atoms behave to form positive ions?
Answer: They lose electrons
, 15. How do non-metals behave to form negative ions?
Answer: They gain electrons
16. What is the composition of compounds formed between non-metals?
Answer: Molecules (formed by sharing electrons)
17. Relative charges:
* Proton: +1
* Neutron: 0
* Electron: -1
what is the nucleus surrounded by? ✔️electrons
what is a balanced equation? ✔️an equation in which each side of the equation has the same number
of atoms of each element and mass is conserved
what are never created or destroyed during a chemical reaction? ✔️atoms
the total mass of reactants = ✔️total mass of products
how can mixtures be separated? ✔️by physical means, such as filtration, crystallization and simple
distillation
who created the key ideas successively about atoms? ✔️dalton thomson, rutherford and bohr
what experiment did Rutherford do? ✔️gold foil
1. What is the size of an atom's nucleus?
Answer: Approximately 0.1 nanometers in diameter
2. Where is the nucleus located within an atom?
Answer: At the center of the atom
3. What does the nucleus consist of?
Answer: Protons and neutrons
4. What is the charge of a proton?
Answer: Positive
5. What is the charge of an electron?
Answer: Negative
6. What is the mass of an electron?
Answer: Essentially zero
7. What is the charge of a neutral atom?
Answer: Zero
,8. What does the atomic number reveal?
Answer: The number of protons present in an atom
9. What does the mass number indicate?
Answer: The total number of protons and neutrons in an atom
10. Define an element:
Answer: A substance composed of only one type of atom
11. What are isotopes?
Answer: Atoms with the same number of protons but different numbers of neutrons
12. How do compounds form?
Answer: When two or more elements combine chemically
13. What is the composition of compounds formed between metals and non-metals?
Answer: Ions (metal ions and non-metal ions)
14. How do metal atoms behave to form positive ions?
Answer: They lose electrons
, 15. How do non-metals behave to form negative ions?
Answer: They gain electrons
16. What is the composition of compounds formed between non-metals?
Answer: Molecules (formed by sharing electrons)
17. Relative charges:
* Proton: +1
* Neutron: 0
* Electron: -1
what is the nucleus surrounded by? ✔️electrons
what is a balanced equation? ✔️an equation in which each side of the equation has the same number
of atoms of each element and mass is conserved
what are never created or destroyed during a chemical reaction? ✔️atoms
the total mass of reactants = ✔️total mass of products
how can mixtures be separated? ✔️by physical means, such as filtration, crystallization and simple
distillation
who created the key ideas successively about atoms? ✔️dalton thomson, rutherford and bohr
what experiment did Rutherford do? ✔️gold foil
