1. 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 1 of 9

2. How many electrons in the outer shell of group 7 elements?

Question 2 of 9

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

Question 3 of 9

4. 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 4 of 9

5. Calculate the relative formula mass(Mr) of zinc phosphide (Zn₃P₂)

Question 5 of 9

6. What is meant by the term molecular formula?

Question 6 of 9

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

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. State the particle that is found in the shells orbiting the nucleus

Question 9 of 9


 

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