1. 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 1 of 9

2. State the mass and charge of a neutron

Question 2 of 9

3. What is the relative atomic mass (Aᵣ) of a helium atom?

Question 3 of 9

4. A compound that contained 24.24% Carbon. 4.04% Hydrogen and 71.72% Chlorine and has a relative molecular mass of 99. Calculate the empirical formula and the molecular formula.

Question 4 of 9

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

Question 5 of 9

6. What is meant by the term molecular formula?

Question 6 of 9

7. Calculate the relative formula mass(Mr) of propane (C₃H₈)

Question 7 of 9

8. Tungsten has the chemical symbol W. Suggest the chemical name of WO₃.

Question 8 of 9

9. How many electrons in the outer shell of group 2 elements?

Question 9 of 9


 

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