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AQA GCSE Chemistry Paper 1 (Triple)

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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 i...

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  • July 11, 2024
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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

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