Matter and Chemical Change: Going Further

Reading the periodic table, balancing equations and telling a chemical change from a physical one.

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

What this covers

The questions

  1. A student heats a sealed tube of copper and sulfur. The contents change colour, the tube gets hot on its own, and the solid left behind will not separate with a magnet. Which claim is best supported?
  2. An atom of aluminium has atomic number 13 and mass number 27. How many neutrons does it have?
  3. Why are the elements in Group 17 of the periodic table so similar in how they react?
  4. Which observations are good evidence that a chemical reaction has taken place? Select all that apply.
  5. Balance this equation and give the coefficient in front of the oxygen: __ H2 + __ O2 -> __ H2O
  6. In the reaction above, 4 g of hydrogen reacts completely with 32 g of oxygen. What mass of water forms, and why?
  7. A safety label on a bottle shows the WHMIS symbol of a flame over a circle. What does it warn about?
  8. Two students each add the same mass of zinc to the same acid. One uses a single lump and the other uses powder. What difference should they expect?

Answer these free