1. Which particle(s) in an atom has a negative charge?

Question 1 of 9

2. 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 2 of 9

3. How many electrons in a calcium atom?

Question 3 of 9

4. What is the atomic number of a beryllium atom?

Question 4 of 9

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

Question 5 of 9

6. 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 6 of 9

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

Question 7 of 9

8. What is meant by the term molecular formula?

Question 8 of 9

9. 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 9 of 9


 

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