1. Calculate the relative formula mass(Mr) of carbon dioxide (CO₂)

Question 1 of 9

2. How many electrons in the outer shell of group 5 elements?

Question 2 of 9

3. What is the atomic number of a chlorine atom?

Question 3 of 9

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

Question 4 of 9

5. What is meant by the term empirical formula?

Question 5 of 9

6. 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 6 of 9

7. 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 7 of 9

8. Work out the empirical formula of an oxide of chlorine contains 7.1 g of chlorine and 1.6 g of oxygen.

Question 8 of 9

9. Which particle(s) in an atom has the smallest mass?

Question 9 of 9


 

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