7He A soluble problem 4 Write down two factors that affect the amount of solid needed to make a saturated solution.

7He A soluble problem 5 Milk of Magnesia is an indigestion remedy which contains magnesium oxide. How can you tell from the picture that not all the magnesium oxide has dissolved? (Hint: page 91 may help you.)

7He A soluble problem 6 Are these statements true or false? If you think one is false, explain why. a) If you add more liquid to a saturated solution, more of the solid will dissolve. b) If you stir a saturated solution, more of the solid will dissolve. c) If you heat a saturated solution, more of the solid will dissolve. d) If you pour the water into a wide, shallow dish, more solid will dissolve.

7He A soluble problem 4 Write down two factors that affect the amount of solid needed to make a saturated solution. For example: type of solid, nature of solvent, temperature, volume of solvent.

7He A soluble problem 5 Milk of Magnesia is an indigestion remedy which contains magnesium oxide. How can you tell from the picture that not all the magnesium oxide has dissolved? The liquid is cloudy/milky. If all the solid had dissolved the liquid would be clear or transparent (see-through).

7He A soluble problem 6 Are these statements true or false? If you think one is false, explain why. a) If you add more liquid to a saturated solution, more of the solid will dissolve. true b) If you stir a saturated solution, more of the solid will dissolve. False. The definition of saturated means that no more solid will dissolve. Stirring only affects the speed of dissolving.

7He A soluble problem c) If you heat a saturated solution, more of the solid will dissolve. true d) If you pour the water into a wide, shallow dish, more solid will dissolve. False, the overall volume of water will be the only relevant factor.