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Chemistry Past Paper Questions
Karten in diesem Stapel (14)
- 1The atomic number of an atom is the number of....Protons
- 2The mass number of an atom is the number ofProtons and Neutrons
- 3Explain why an atom has no overall charge. Use the relative electrical charges of sub-atomic particles in your explanation.The relative electrical charges are - for an electron and + for a proton, and the number of electrons is equal to the number of protons
- 4Explain why fluorine and chlorine are in the same group of the periodic table. Give the electronic structures of fluorine and chlorine in your answer.The electronic structure of fluorine is 2,7 and chlorine is 2, 8, 7 so fluorine and chlorine are in the same group because they have the same number of/7 electrons in their highest energy level/outer shell.
- 5What is the chemical symbol of an atom with the structure 2, 8, 6?S
- 6Compounds formed when non-metals react with metals consist of particles called...Ions
- 7Compounds formed from only non-metals consist of particles called...Molecules
- 8The main compound in limestone is calcium....Carbonate
- 9The reaction to produce calcium oxide from limestone is thermal...Decomposition
- 10Calcium hydroxide is produced when calcium oxide reacts with...Water
- 11Calcium hydroxide is used to neutralise acids because it is an...Alkali
- 12Describe one way the students could improve the method so that their results are more accurate for each graph point.They could repeat the experiment to calculate a mean/average value.
- 13There are many theories about how life was formed on Earth. Suggest one reason why.Not enough evidence OR life and the Earth were created billions of years ago.
- 14—
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- Questions from Unit 1 past papers with answers.
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- Mike Schmidt
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