GCSE OCR Combined Science B Papers 1 and 5

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OCR Combined Science B Papers 4 and 8

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OCR Combined Science B Papers 4 and 8

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#1. Which of the following descriptions best matches the hormonal system?

#2. In what part of the cells does aerobic respiration take place?

#3. Solutions of more than pH 7 are?

#4. What is the chemical symbol for sodium?

#5. In aqueous solutions such as sodium chloride solution, there will be positively charged ions from the salt (Na⁺) as well as hydrogen ions (H⁺). What is the rule that determines which will be discharged at the cathode.

#6. Which of the following are problems with using biofuels as a replacement for oil?

Select all that apply:

#7. What is the chemical symbol for potassium?

#8. Which form of radiation is most ionising?

#9. What state of matter has particles which are close together and vibrate around fixed positions?

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

#11. What is the function of a resistor?

#12. Which of the following are strong acids?

Select all that apply:

#13. Why is diamond hard?

#14. What is an alpha particle?

#15. 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.

#16. Which form of radiation is least ionising?

#17. Where does blood from the aorta travel to?

#18. Which theory do we use to describe states of matter?

#19. Cobalt is a magnetic material – true or false?

#20. What is the resolution of electron microscopes limited by?

#21. Is natural gas renewable?

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

#23. Is acceleration a vector or a scalar?

#24. 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 →

#25. What is induced magnetism?

#26. What is an isotope?

#27. What is the role of starch synthase?

#28. By which process does water in the oceans and lakes move into the atmosphere?

#29. Lead has 4 stable isotopes. ²⁰⁴Pb (abundance – 1.4%), ²⁰⁵Pb (abundance – 24.1%), ²⁰⁷Pb (abundance – 22.1%) and ²⁰⁸Pb (abundance – 52.4%). Calculate the Aᵣ of lead. Answer to 2 decimal places.

#30. What is the chemical symbol for chlorine?

#31. The diagram shows a solenoid. Why is the magnetic field stronger along the centre of the coil than on the outside? ? Select two answers

Select all that apply:

#32. Why is catalysis by enzymes important for life processes?

#33. What is the name of the chemicals that we use to transmit messages through the blood to organs?

#34. What is the function of a cell?

#35. What wavelength of the electromagnetic spectrum is useful for thermal imaging?

#36. Oxygen is in group 6 and fluorine is in group 7. How many fluorine atoms bond with one oxygen atom?

#37. What is groundwater?

#38. 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 → ….. + …..

#39. Which of the following plants have a mutualistic relationship with nitrogen-fixing bacteria?

Select all that apply:

#40. Why do plants need nitrogen?

#41. How many chambers does the heart have?

#42. Will endothermic reactions continue if there is no energy input?

#43. Which of the following is an advantage of crude oil?

#44. The needles of plotting compasses are tiny magnets – they always point near the Earth’s North Pole – why is this?

#45. Can Rf values be higher than 1?

#46. Neutralisation reactions which occur between an acid and a base are always:

#47. Which square instrument do we use for randomly sampling population sizes?

#48. What is the charge of a neutron?

#49. Which of the following are problems that would arise from measuring an extremely slow rate of reaction?

Select all that apply:

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

#51. What is the name of the phase change from solid to gas?

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

#53. Is time a vector or a scalar?

#54. Why is the rate of an enzyme controlled reaction highest at an optimum pH?

#55. Which of the following is a disadvantage of tidal energy generation?

#56. What does F represent in the equation for work done?

#57. How can we describe the motion of the object in this graph between 7 and 10 seconds?

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

#59. Why is it dangerous to connect a live and earth wire?

#60. In a parallel circuit, is the potential difference across each branch –

#61. Which of these are common properties of giant covalent materials?

#62. What is enzyme specificity?

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

#64. In which part of the cell does anaerobic respiration take place?

#65. What is a battery?

#66. When an impulse reaches an axon terminal what happens?

#67. Which type of reaction is photosynthesis?

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

#69. Complete the sentence: In the UK the domestic electricity supply has a frequency of … Hz and is about ….. V.

#70. What are positrons?

#71. The 5 kingdoms of life are Animals, Plants, Fungi, Protists and Prokaryotes. Which kingdom do algae belong to?

#72. True or false – microwave radiation at certain frequencies could cause the internal heating of cells in our bodies?

#73. Fresh water contains many different contaminants and so must be cleaned before it becomes potable. Which is the correct treatment path?

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

#75. Which of the following is the source of oil and gas?

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