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GCSE OCR Chemistry Papers 1 and 3
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#1. Are metals usually shiny or dull in colour?
#2. True or false – Precipitation reactions can be either exothermic or endothermic.
#3. Calculate the relative formula mass of water. Hydrogen Aᵣ = 1, Oxygen Aᵣ = 16.
#4. In which sub-cellular structure inside plant cells does photosynthesis occur?
#5. Which types of atoms can be found in a pure piece of gold?
Select all that apply:
#6. What is the formula for potassium hydroxide?
#7. During a neutralisation reaction which salt is formed from hydrochloric acid?
#8. What is the freezing point of water?
#9. Complete the following equation describing a reaction with a metal and an acid: metal + acid → …. + ….
Select all that apply:
#10. What is the formula for the polyatomic ion ammonium?
#11. Why does diamond not conduct electricity?
#12. What is the formula for nitric acid?
#13. Which process can be used to separate water from dissolved salts, whilst keeping both substances?
#14. Which of the following are the 4 factors that affect the rate of photosynthesis?
Select all that apply:
#15. What type of substance is pure gold (Au)?
#16. What is the formula for the compound calcium nitrate which is made of calcium and nitrate ions (NO₃⁻)?
#17. Complete the equation: H⁺(aq) + OH⁻(aq) → ….
Remember:
acids produce an excess of hydrogen ions
alkalis produce an excess of hydroxide ions
hydrogen ions and hydroxide ions come together to make water which is neutral.
#18. This image shows the apparatus used during fractional distillation. What is function of the fractionating column?
#19. The table shows 3 substances and their melting points. Which types of substances could Y be?
Select all that apply:
#20. Which of the following descriptions matches the Mᵣ of a compound?
#21. What is the formula for hydrochloric acid?
#22. Calculate the relative formula mass of copper oxide (CuO) to 2 decimal places. Copper Aᵣ = 63.5, Oxygen Aᵣ = 16.
#23. Determine the empirical formula of glucose – C₆H₁₂O₆.
#24. The melting point of gallium is 29.8˚C and the boiling point is 2204˚C. What state is gallium at 25˚C?
#25. Which of the following describe the composition of a pure substance?
Select all that apply:
#26. During electrolysis which electrode do anions and cations migrate to?
#27. In aqueous solutions such as sodium chloride solution, there will be negatively charged ions from the salt (Cl⁻) as well as hydroxide ions (OH⁻). What is the rule that determines which will be discharged at the anode.
#28. Why is magnesium a better electrical conductor than sodium?
#29. After filtering a mixture containing sand, salt and water using filter paper. What do we call what is left in the filter paper?
#30. What is the symbol for relative atomic mass?
#31. What is the charge of a neutron?
#32. What is the chemical symbol for helium?
#33. What is the electronic configuration of a nitrogen atom? ? you might need a periodic table to answer this question
#34. What is the name of the phase change from solid to liquid?
#35. The table shows 3 substances and their melting points. What common substance, in particular, could substance Z be?
#36. What is the equation for Rf values in paper chromatography?
#37. Which of the following descriptions matches the term molecular formula?
#38. Complete the equation: H₂SO₄(aq) + ZnO(s) → …. + ….
Select all that apply:
#39. Calcium nitrate contains the polyatomic ion NO₃⁻ (nitrate) and calcium. How many nitrate ions will be needed to make one molecule of calcium nitrate?
#40. Are non-metals usually good conductors of electricity?
#41. What do we use fullerenes for?
#42. What is the chemical symbol for magnesium?
#43. What method can we use to separate multiple types of liquids?
#44. Ernest Rutherford fired positive particles at a thin gold foil and showed that most of atoms is empty space. Which particles did he fire at the gold foil?
#45. What is the formula for the polyatomic ion carbonate?
#46. Neutralisation reactions which occur between an acid and a base are always:
#47. Which three particles are atoms composed of?
#48. What type of substance is carbon dioxide (CO₂ )?
#49. Since metallically bonded atoms have a delocalised pool of electrons, these electrons are able to conduct ……
Select all that apply:
#50. What is the chemical symbol for gold?
#51. What is the formula for calcium hydroxide?
#52. When using inert electrodes to perform electrolysis with copper chloride solution, which products will be produced at the anode and cathode?
#53. What is the chemical symbol for carbon?
#54. What is an electrolyte?
#55. What is the approximate radius of a nucleus?
#56. Complete the following half equation for a reaction the cathode during electrolysis of molten zinc chloride. Zn²⁺ + ….. → Zn
#57. What is a solution called when it contains the maximum amount of solute that can dissolve in a solvent at a particular temperature?
#58. How many atoms of potassium (group 1) are needed to bond ionically with oxygen (group 6)?
#59. Where is most of the mass of an atom?
#60. What is the chemical symbol for silver?
#61. How many sulfur atoms will react with two lithium atoms to form an ionic compound?
#62. Are metals usually good conductors of electricity?
#63. In which type of reaction would the temperature of a solution increase?
#64. Which of these is the stationary phase in paper chromatography?
#65. Solutions of more than pH 7 are?
#66. What state of matter has particles which are far apart and move around independently?
#67. 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
#68. During a neutralisation reaction which salt is formed from nitric acid?
#69. Which type of reaction is photosynthesis?
#70. 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 cathode. Cu²⁺ + 2e →
#71. What is the chemical symbol for phosphorus?
#72. What do group one atoms do when they bond ionically with group 7 atoms?
#73. What is the formula for the polyatomic ion nitrate?
#74. Energy is transferred between the environment and reactants during a chemical reaction. What form is this energy usually in?
#75. Which of the following descriptions matches the term empirical formula?
#76. What is the chemical symbol for copper?
#77. Alkalis produce an excess of what when they dissolve in water?
#78. What the the most dense state of matter?
#79. Which of these is a problem with dot and cross diagrams?
#80. In 1897 JJ. Thomson did a series of experiments that led to the discovery of which particles?
#81. H₂SO₄(aq) + Na₂O(s) → …. + ….
Select all that apply:
#82. Fill in the blanks: Electrolysis is a process in which ………. energy from a ………. current supply is used to decompose electrolytes.
#83. Fill in the gap. Metal atoms bond forming a giant ……… of ions.
#84. What is the charge of a proton?
#85. Can strong and weak acids have the same pH?
#86. Which description best describes an element?
#87. Strong acids do what in water? ? two words
#88. Which of the following are uses for paper chromatography?
Select all that apply:
#89. Complete the following equation describing a neutralisation reaction with a metal oxide: metal oxide + acid → …. + ….
Select all that apply: