Matter and Chemical Change: More Practice

More practice on atomic structure, chemical change and reaction rate, for once the required set is done.

8 questions, free, marked as you go with a worked explanation on every one.

What this covers

• matter and chemical change

The questions

1. An atom has atomic number 17 and mass number 35. How many neutrons does it have?
2. Which of these is a physical change rather than a chemical one?
3. Balance this equation and give the coefficient in front of H2: __ N2 + __ H2 -> __ NH3
4. In a sealed container, 8 g of substance A reacts completely with 12 g of substance B. What is the total mass of the products?
5. Which of these are physical properties rather than chemical ones? Select all that apply.
6. A safety label shows the WHMIS symbol of a skull and crossbones. What does it warn about?
7. A metal block takes 120 seconds to react completely with acid. An identical mass of the same metal, as powder, reacts completely in 20 seconds. How many times faster is the reaction with the powder?
8. Adding a catalyst speeds up a reaction. What does a catalyst leave unchanged?

Answer these free