1. Use Q=mcΔT and c=4.18J/°C/g. 25cm³ of sulfuric acid is put into a boiling tube. The starting temperature is 21°C. A spatula of iron filings is added. After a while the temperature reaches 33°C. What is the total heat energy change?

Question 1 of 17

2. Complete the following expression: mass =

Question 2 of 17

3. What is meant by the term empirical formula?

Question 3 of 17

4. To determine the formula of a metal oxide by combustion, magnesium is heated in a crucible. Why is a lid used?

Question 4 of 17

5. State the units of molar enthalpy change.

Question 5 of 17

6. Name this piece of lab equipment

Question 6 of 17

7. 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 200g water?

Question 7 of 17

8. What is the empirical formula of an alcohol with the analysis; 52.2% C, 13.0% H and 34.8% O?

Question 8 of 17

9. 200 cm³ of potassium sulfate solution has a concentration of 2 mol/dm³. What amount of potassium sulfate does it contain?

Question 9 of 17

10. What is the meaning of the word mole in Chemistry?

Question 10 of 17

11. What is the meaning of the term Molar Volume?

Question 11 of 17

12. 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 12 of 17

13. State the expression for calculating % yield.

Question 13 of 17

14. What mass of calcium bromide will fully react with 71g of chlorine?

Question 14 of 17

15. Calculate the relative formula mass(Mr) of a molecule of bromine (Br₂)

Question 15 of 17

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

Question 16 of 17

17. A sample of carbon contained 98.90% carbon-12 and 1.10% carbon-13. Calculate the relative atomic mass of carbon

Question 17 of 17


 

Related Posts: