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Determining an equation from given values

The starter and exit quiz of the lesson “Determining an equation from given values”, from the unit “Calculations involving masses” (Year 10 Science) by Oak National Academy.

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Oak National Academy

12 questions

  1. A beaker contains six pens. Three pens are black, two are red and one is green. Which of the follow ratios are correct?
  2. Which empirical formula shows a metal to non-metal ratio of 1 : 2?
  3. True or false? The unit for relative atomic mass is grams.
  4. State the unit for amount of substance.
  5. When a chemical is __________ there will always be some left over at the end of the reaction.
  6. Calculate the relative formula mass of ammonium nitrate, NH₄NO₃. Relative atomic masses: N = 14; H = 1; O = 16.
  7. The formula for sulfuric acid is H₂SO₄. What is the ratio of oxygen to sulfur in the formula?
  8. Which of the following chemical equations shows a similar molar ratio to the reaction?: Ca(OH)₂ + 2HNO₃ → Ca(NO₃)₂ + 2H₂O
  9. 6 moles of calcium hydroxide, Ca(OH)₂, react with excess nitric acid, HNO₃. How many moles of water are formed in the reaction?Ca(OH)₂ + 2HNO₃ → Ca(NO₃)₂ + 2H₂O
  10. 0.5 g of magnesium reacts with oxygen to form 0.8 g of magnesium oxide. Calculate the number of moles of magnesium oxide formed during the reaction. Relative atomic masses: Mg = 24; O = 16.
  11. What is the reacting ratio when 12.0 g of magnesium, Mg, reacts with 8.0 g of oxygen, O₂, to produce magnesium oxide?
  12. It is possible to determine the balanced symbol equation of a reaction from the molar ratios using the following step. Place the steps into the correct order.

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Determining an equation from given values · Examplary