Temperature (⁰C) 200 300 400 500 Percentage (%) 89 67 39 18 Describe how the percentage varies with temperature. Using the information in both tables, suggest the combination of temperature and pressure that would produce the highest percentage yield of ammonia. The essential elements for plant growth are nitrogen, phosphorus and potassium. A student was asked to prepare a dry sample of a compound which contained two of these elements. The student was given access to laboratory equipment and the following chemicals. Chemical Formula Ammonium hydroxide NH4OH Magnesium nitrate Mg(NO3)2 Nitric acid HNO3 Phosphoric acid H3PO4 Potassium carbonate Potassium hydroxide KOH Sodium hydroxide NaOH Sulfuric acid H2SO4 Water H2O Using your knowledge of chemistry, comment on how the student could prepare their dry sample. You may wish to use the data booklet to help you. Aluminium is a metal commonly used to build aircraft. Explain why aluminium is more suitable for making aircraft than iron. You may wish to use your data booklet to help you. Aluminium is the most abundant metal in the Earth’s crust where it is commonly found in ores in the form of aluminium hydroxide and aluminium oxide. The first time aluminium was extracted in 1825, unlike copper which was extracted in prehistoric times. Using your knowledge of chemistry, discuss why aluminium, which is more abundant than copper in the Earth’s core, was only extracted from ores in recent history.
Temperature (⁰C) 200 300 400 500 Percentage (%) 89 67 39 18 Describe how the percentage varies with temperature. Using the information in both tables, suggest the combination of temperature and pressure that would produce the highest percentage yield of ammonia. The essential elements for plant growth are nitrogen, phosphorus and potassium. A student was asked to prepare a dry sample of a compound which contained two of these elements. The student was given access to laboratory equipment and the following chemicals. Chemical Formula Ammonium hydroxide NH4OH Magnesium nitrate Mg(NO3)2 Nitric acid HNO3 Phosphoric acid H3PO4 Potassium carbonate Potassium hydroxide KOH Sodium hydroxide NaOH Sulfuric acid H2SO4 Water H2O Using your knowledge of chemistry, comment on how the student could prepare their dry sample. You may wish to use the data booklet to help you. Aluminium is a metal commonly used to build aircraft. Explain why aluminium is more suitable for making aircraft than iron. You may wish to use your data booklet to help you. Aluminium is the most abundant metal in the Earth’s crust where it is commonly found in ores in the form of aluminium hydroxide and aluminium oxide. The first time aluminium was extracted in 1825, unlike copper which was extracted in prehistoric times. Using your knowledge of chemistry, discuss why aluminium, which is more abundant than copper in the Earth’s core, was only extracted from ores in recent history.
N5-Problem-solving-booklet.docx