1. Balance the following equation: WO₃ + H₂ → W + H₂O

Question 1 of 10

2. Complete the following expression: amount (in moles) =

Question 2 of 10

3. What are the units for amount in Chemistry?

Question 3 of 10

4. What is the meaning of the word mole in Chemistry?

Question 4 of 10

5. What do each of the following state symbols represent: (s), (l), (g), (aq)

Question 5 of 10

6. What mass of carbon dioxide is produced when 24g of carbon undergoes completely combustion?

Question 6 of 10

7. What mass of calcium bromide will fully react with 71g of chlorine?

Question 7 of 10

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

Question 8 of 10

9. Complete the following expression: mass =

Question 9 of 10

10. Calculate the relative formula mass(Mr) of hydrated copper (II) sulfate (CuSO₄.5H₂O)

Question 10 of 10


 

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