1. What are the units for amount in Chemistry?

Question 1 of 17

2. What is the equation linking moles, Mᵣ and mass

Question 2 of 17

3. 7.485 g of a hydrated copper(II) sulphate CuSO₄.xH₂O was heated producing 4.785g of anhydrous copper(II) sulphate. What is the formula of the hydrated salt?

Question 3 of 17

4. Calculate the relative formula mass(Mr) of cobalt chloride crystals (CoCl₂.6H₂O)

Question 4 of 17

5. In a chemical reaction, the overall molar enthalpy is -87 kJ/mol. Is this reaction exothermic or endothermic?

Question 5 of 17

6. A graph shows the solubility of sodium chloride in water at 50°C is 34g/100g. At that temperature, what mass of sodium chloride will dissolve in 50g water?

Question 6 of 17

7. In the thermal decomposition of calcium carbonate, we might expect 50g of calcium carbonate to produce 28g of calcium oxide. If instead only 24g of calcium oxide is produced, what is the percentage yield?

Question 7 of 17

8. In a combustion calorimetry experiment, 0.78g of ethanol (C₂H₅OH) produced 12,540 J of heat energy. Calculate the molar enthalpy change.

Question 8 of 17

9. To determine the formula of a metal oxide by combustion, magnesium is heated in a crucible. Why is the crucible is cooled, weighed, reheated, cooled, re-weighed, and so on?

Question 9 of 17

10. State the expression for calculating molar concentration

Question 10 of 17

11. What volume does 0.5 moles of ethene gas occupy (at rtp)

Question 11 of 17

12. Name this piece of lab equipment

Question 12 of 17

13. A sample of bromine contained the two isotopes in the following proportions: bromine-79 = 50.7% and bromine-81 = 49.3%. Calculate the relative atomic mass of bromine

Question 13 of 17

14. What mass of carbon dioxide is produced when 24g of carbon undergoes completely combustion?

Question 14 of 17

15. What is meant by the term empirical formula?

Question 15 of 17

16. An oxide of nitrogen contains 26% nitrogen and 74% oxygen and has a relative molecular mass of 108. Find the empirical and molecular formulae for the oxide.

Question 16 of 17

17. Use Q=mcΔT and c=4.18J/°C/g. A strip of magnesium is added to a beaker with 200cm³ of copper (II) sulfate. The temperature starts at 21.7°C and rises to a maximum of 23.1°C. What is the total heat energy change?

Question 17 of 17


 

Related Posts: