Topic 5 Mass calculations, electrolysis, metals and equilibria

• What is the formula of water?

• What is the formula of sodium chloride?

• What is the formula of carbon dioxide?

• The formula of sulfuric acid is H2SO4. How many atoms of each element are in the formula?

• Sodium chloride has the formula NaCl. The relative atomic mass of sodium is 23 and that of chlorine is 35.5. What is the relative formula mass of NaCl?

• The relative atomic mass of hydrogen is 1. What is the relative formula mass of hydrogen molecules?

• A water molecule has the formula H2O; the relative atomic mass of hydrogen is 1 and that of oxygen is 16. What is the relative formula mass of water?

• A carbon dioxide molecule has the formula CO2; the relative atomic mass of carbon is 12 and that of oxygen is 16. What is the relative formula mass of carbon dioxide?

• What is the empirical formula of a compound with molecular formula C2H4?

• What is the empirical formula of a compound with molecular formula C3H8?

• A sample of magnesium carbonate was heated in an open test tube. Why did it lose mass?

• Why does magnesium increase in mass when it is heated in air?

• How many cm3 are there in 1 dm3?

• 100 cm3 of a solution contains 1.5 g of salt. What is the concentration of the salt solution in g d3?

• What name is given to an atom that has gained or lost electrons?

• What type of charge is on metal and hydrogen ions?

• What type of charge is on most non-metal ions?

• What is another name for a positive ion?

• What is another name for a negative ion?

• What is the symbol for a sodium ion?

• What is the symbol for a magnesium ion?

• What is the symbol for a chloride ion?

• In what states do ionic compounds conduct electricity?

• What is the name of the positively charged electrode?