GCSE OCR Combined Science A Papers 3 and 9

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OCR Combined Science A Papers 3 and 9

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OCR Combined Science A Papers 3 and 9

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#1. Match the following description to the correct term. X is a mixture made of dissolved substances in a liquid.

#2. What is the chemical symbol for iron?

#3. Fill in the gap. Metal atoms bond forming a giant ……… of ions.

#4. Copper can be purified using electrolysis of copper sulfate solution. For this process we use the setup in the image below. Complete the half equation for the reaction at the anode. Cu → ….. + …..

#5. Which of the following are uses for paper chromatography?

Select all that apply:

#6. Relative atomic mass used to have a different name. What was that name?

#7. Solutions of less than pH 7 are?

#8. What is the name of the process by which salt is removed from water?

#9. When using inert electrodes to perform electrolysis with molten lead bromide, which products will be produced at the anode and cathode?

#10. What is the chemical symbol for mercury?

#11. What type of substance is carbon dioxide (CO₂ )?

#12. Why is magnesium a better electrical conductor than sodium?

#13. What are negative ions called?

#14. When using inert electrodes to perform electrolysis with copper chloride solution, which products will be produced at the anode and cathode?

#15. Complete the equation: HCl (aq) + KOH(s) → ….. + …..

Select all that apply:

#16. What is the chemical symbol for sulfur?

#17. What is the chemical symbol for potassium?

#18. What is the formula for nitric acid?

#19. Calculate the relative formula mass of carbon monoxide (CO) to 2 decimal places. Carbon Aᵣ = 12, Oxygen Aᵣ = 16.

#20. What is the chemical symbol for radon?

#21. In which type of reaction would the temperature of a solution increase?

#22. What are giant covalent structures?

#23. After filtering a mixture containing sand, salt and water using filter paper. What do we call what is left in the filter paper?

#24. Complete the following equation: MgO (s) + H₂SO₄ (aq) → …. + ….

Select all that apply:

Neutralisation reactions follow the general structure –

metal oxide acid = salt water

the acid produces hydrogen ions and the metal oxide produces oxide ions – these combine to make the water

the salt is comprised of the remaining products – the metal and the other element from the acid

in this case, the other element is chlorine

The naming convention is to put the metal first for the salt created

#25. What is the formula for the compound calcium nitrate which is made of calcium and nitrate ions (NO₃⁻)?

#26. What is the formula for the polyatomic ion sulfate?

#27. Calculate the relative formula mass of copper oxide (CuO) to 2 decimal places. Copper Aᵣ = 63.5, Oxygen Aᵣ = 16.

#28. Covalent compounds typically form between which two types of material?

#29. Why does graphite conduct electricity?

#30. Are non-metals usually shiny or dull in colour?

#31. During a neutralisation reaction which salt is formed from sulfuric acid?

#32. Why do both graphite and diamond have high melting points?

#33. What is the formula for hydrochloric acid?

#34. What are positive ions called?

#35. Do metals usually have a high or low density?

#36. What the the most dense state of matter?

#37. Isotopes of atoms have different numbers of which particles?

#38. Which description best describes mixtures?

#39. Where is most of the mass of an atom?

#40. What is the formula for calcium hydroxide?

#41. Why is diamond hard?

#42. Which of the following descriptions matches the Mᵣ of a compound?

#43. A paper chromatography experiment is carried out in a lab. The distance moved by the spot was 6cm and the solvent had moved by 8cm. Calculate the Rf value.

#44. Fill in the blanks: Reduction refers to the …… of electrons and it occurs at the ……..

#45. True or false – You cannot use physical processes to separate mixtures into different substances.

#46. What is a simple molecular structure?

#47. During electrolysis which electrode do anions and cations migrate to?

#48. In 1897 JJ. Thomson did a series of experiments that led to the discovery of which particles?

#49. Which electrode would the ion Mg²⁺ migrate to during electrolysis?

#50. What is the formula for potassium hydroxide?

#51. The distance travelled by a spot is determined by the solubility of the compound. How does solubility impact distance travelled?

#52. Which of the following items would you need to perform crystallisation by heating? ? 6 items

Select all that apply:

#53. What is the relative mass of a neutron?

#54. If covalent bonds are very strong, then why does water have a low melting point?

#55. What the the least dense state of matter?

#56. Which of the following are strong acids?

Select all that apply:

#57. What is the relative mass of a proton?

#58. Are metals usually shiny or dull in colour?

#59. What is the chemical symbol for sodium?

#60. When using inert electrodes to perform electrolysis with sodium sulfate solution, which products will be produced at the anode and cathode?

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