GCSE OCR Gateway A Combined Higher Chemistry C2 Exam Questions and Answers

GCSE OCR Gateway A Combined Higher Chemistry
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C2
1. What isStudyrelative atomic mass: The mean mass of an atom of an element compared to one twelft
online at https://quizlet.com/_cqq03m
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h of the mass of an atom of carbon 12 atom
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2. What is the abbreviation for relative atomic mass: Ar
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3. What is the chemical formula: Tells you how many atoms of each element there is in a unit of a
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substance
4. What is relative formula mass: The mean mass of a unit of a substance compared to one twelfth
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of the mass of an atom of carbon 12 atom
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5. How do you find the relative formula mass: Add up the relative atomic masses of all the
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ions in the formula unit
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6. What is an empirical formula: The smallest whole number ratio of atoms in a compound
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7. What does pure mean: A substance that only contains one type of element or compound
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8. What is an alloy: A mixture of two or more elements, at least one of which is a metal
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9. What is the melting point of a substance: The temperature at which it changes from a soli
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to
a liquid
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10. What affect does purity have on melting point: In an impure substance, melting poin
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t is usually lower than that of the pure substance and melts over a range of temperatures
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11. What happens when a substance dissolves: Solute particles separate and become complete
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ly mixed with the particles of the solvent
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12. What is the solute: The substance that is dissolved
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13. What is the solvent: The substance in which the solute dissolves
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14. What does soluble mean: A particular substance is able to dissolve in that particular solvent
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15. What does insoluble mean: A particular substance is not able to dissolve in that particular solven
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16. What is filtration: Separating an insoluble solid from a liquid
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17. What is the residue in filtration: The insoluble solid left in the filter paper after filtration
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18. What is the filtrate in filtration: The solvent that passes through the filter paper into the conical
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ask
19. Why does filtration not work for solutions: Dissolved particles are small enough to pas
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through the filter paper p4 p4 p4


20. How does crystallisation work: Gently heat a solution, the solvent will evaporate leaving the sol
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ute behind, you need to heat the solution gently until it becomes saturated then let the solution cool slowly and the
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crystals will form p4 p4


1
p4/p4
11

, GCSE OCR Gateway A Combined Higher Chemistry
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C2
21. What Study
is online
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distillation: Separates a solvent from a solution
at https://quizlet.com/_cqq03m
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22. What does distillation rely on: Ditterent boiling points of solvent and solute
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2
p4/p4
11