1. In terms of subatomic particles, what are isotopes?

Question 1 of 9

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

Question 2 of 9

3. What is meant by the term molecular formula?

Question 3 of 9

4. What is the empirical formula of a compound in which 0.48 g of carbon combines with 0.08 g of hydrogen and 0.64 g of oxygen?

Question 4 of 9

5. Which particle(s) in an atom has a positive charge?

Question 5 of 9

6. 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 6 of 9

7. How many electrons can the second shell hold?

Question 7 of 9

8. 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 8 of 9

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 9


 

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