Review Questions

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This activity contains 20 questions.

	Which list shows mixtures in which the particles dispersed in water are increasing in size?   colloid, solution, suspension suspension, colloid, solution solution, suspension, colloid solution, colloid, suspension

	Which of the following descriptions is correct?   a mixture consists of two or more pure substances which can only be separated by chemical methods a colloid is a 'cloudy' mixture containing particles which will not easily settle out when the colloid is left standing a suspension contains particles which will not settle out if the suspension is left standing a solution consists of a solvent dissolved in a solute

	In order to dissolve the greatest amount of sugar in a cup of water, you should …   use sugar in large pieces, and heat the water use sugar crushed into small pieces, and cool the water use sugar crushed into small pieces, and heat the water use sugar in large pieces, and cool the water

	Which of the following would not be described as a colloid?   smoke saltwater fog foam

	Which of these terms is not used to describe a solid which remains behind during a separation process?   filtrate sediment residue gangue

	A mixture of iron filings and copper filings could best be separated by …   distillation magnetic separation adding water, then filtering sieving

	Which of the following separations cannot be carried out using a centrifuge? The separation of  …   cream from milk salt from sea water red blood cells from plasma water from wet clothes

	Which of the following does not occur during froth flotation to separate copper from copper containing rocks?   chemicals are added to the water to keep the bubbles from bursting water is added to powdered rock and air blown in to produce bubbles of froth the copper ore falls to the bottom of the flotation cell to be collected the rock containing the copper is crushed and ground to a fine powder

	A separation technique which involves charging particles and then attracting them to oppositely charged metal plates is called _____ separation.   gravity electrostatic absorption magnetic

	Rainwater passes through several areas and structures before it reaches the taps in your house. Which of the following shows the order in which rainwater passes through these areas and structures?   catchment area, service reservoir, chlorination plant, storage reservoir, water mains catchment area, storage reservoir, chlorination plant, service reservoir, water mains storage reservoir, catchment area, service reservoir, chlorination plant, water mains catchment area, storage reservoir, water mains, chlorination plant, service reservoir

	The process of adding chemicals to water to clump suspended particles so that they can fall and form a sediment is called _____.   flocculation chlorination froth flotation fluoridation

	Gas produced by bacteria as they break down sewage may be collected and used …   to power turbines to disinfect the sewage before it is released as fertiliser to inflate car tyres

	Which of the following shows the usual order of stages as sewage passes through a sewage treatment plant?   settling, aeration, pebble filter, chlorination aeration, settling, pebble filter, chlorination aeration, pebble filter, chlorination, settling chlorination, settling, aeration, pebble filter

	In the aeration tank of a sewage treatment plant …   large objects are removed by a screen chlorine is added to disinfect the sewage suspended solids are removed bacteria break down sewage by feeding on it

	Match each technique with its use. A matching question presents 4 answer choices and 4 items. The answer choices are lettered A through D. The items are numbered 15.1 through 15.4. Screen readers will read the answer choices first. Then each item will be presented along with a select menu for choosing an answer choice. Using the pull-down menus, match each item in the left column to the corresponding item in the right column. to obtain the sediment from a suspension to separate the colours in food dyes to separate a mixture of liquids with different boiling points to separate a mixture containing two solids with different sized particles 15.1 decanting   A B C D 15.2 sieving   A B C D 15.3 distillation   A B C D 15.4 chromatography   A B C D

	Match the colloid name to the components which make up the colloid. A matching question presents 6 answer choices and 6 items. The answer choices are lettered A through F. The items are numbered 16.1 through 16.6. Screen readers will read the answer choices first. Then each item will be presented along with a select menu for choosing an answer choice. Using the pull-down menus, match each item in the left column to the corresponding item in the right column. a gas in a liquid a liquid in a solid a liquid in a gas a solid in a gas a solid in a liquid a liquid in a liquid 16.1 sol   A B C D E F 16.2 emulsion   A B C D E F 16.3 foam   A B C D E F 16.4 gel   A B C D E F 16.5 smoke   A B C D E F 16.6 mist   A B C D E F

	Match each mixture to the apparatus which may be used to separate the components of the mixture. A matching question presents 4 answer choices and 4 items. The answer choices are lettered A through D. The items are numbered 17.1 through 17.4. Screen readers will read the answer choices first. Then each item will be presented along with a select menu for choosing an answer choice. Using the pull-down menus, match each item in the left column to the corresponding item in the right column. 17.1 alcohol and water   A B C D 17.2 sand and water   A B C D 17.3 salt and water   A B C D 17.4 iron filings and sand   A B C D

	Match the water treatment chemical to its use. A matching question presents 4 answer choices and 4 items. The answer choices are lettered A through D. The items are numbered 18.1 through 18.4. Screen readers will read the answer choices first. Then each item will be presented along with a select menu for choosing an answer choice. Using the pull-down menus, match each item in the left column to the corresponding item in the right column. to kill germs to clump suspended particles together so that they can settle out as a sediment to ensure water is at a neutral pH to help prevent tooth decay 18.1 chlorine   A B C D 18.2 fluoride   A B C D 18.3 lime   A B C D 18.4 electrolytes   A B C D

	Label the diagram which shows the activated sludge process for sewage treatment. This question presents 6 items numbered 19.1 through 19.6. Each item is presented with a pulldown menu containing the letters A through F. For each item below, use the pull-down menu to select the letter that labels the correct part of the image. 19.1 large objects are removed by this structure A B C D E F 19.2 suspended solids are removed in this area A B C D E F 19.3 in this tank bacteria and other solids settle as a thick sludge A B C D E F 19.4 These devices are used to disinfect sewage before it is released. A B C D E F 19.5 In this tank bacteria break down sewage, and added chemicals convert dissolved wastes into solids. A B C D E F 19.6 these devices pump air into the tank to 'feed' bacteria which break down the sewage A B C D E F

	Label the diagrams which show laboratory apparatus used to separate mixtures. This question presents 5 items numbered 20.1 through 20.5. Each item is presented with a pulldown menu containing the letters A through E. For each item below, use the pull-down menu to select the letter that labels the correct part of the image. 20.1 distillate A B C D E 20.2 condenser A B C D E 20.3 evaporating basin A B C D E 20.4 residue A B C D E 20.5 filtrate A B C D E