Water Unit Test Question Preview (ID: 28075)
8th Grade Unit Test.
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Some salt vegetables, and spices are added to some hot water. The salt disappears into the water, the vegetables sink to the bottom and the spices float. Which of the following is the solute in this mixture?
a) Salt
b) Vegetables
c) Spices
d) Water
Water is called the universal solvent because it
a) Dissolves many other substances
b) Dissolves both salt and sugar
c) Is found throughout the universe
d) Is necessary for life
Water that is traveling through the water cycle can pick up contaminants
a) When falling through the air as precipitation
b) When traveling as surface water in a river
c) When traveling underground as groundwater
d) All of the above
A cleaning solution of ammonia in water in water turns universal indicator blue. The ammonia solution can be neutralized by adding an acid. Based on this, you can conclude that ammonia is
a) An acid
b) A base
c) Neutral
d) A salt
You measure the pH of some water and it is neutral. This tells you that
a) The water is not polluted
b) The water is safe to drink
c) There is no salt in the water
d) There is no acid in the water
Which of the following is a true statement about acids?
a) They turn universal indicator solution blue
b) They turn pH paper green
c) Examples include vinegar and lemon juice
d) They have a pH of 8 or higher
Which of the following is a true statement about bases?
a) They turn universal indicator solution blue
b) They turn pH paper green
c) Examples include vinegar and lemon juice
d) They taste sour
Equal amounts of acid and base are added to a clean beaker. Which of the following is true? Choose the best answer
a) The pH must be 7
b) The solution must be neutral
c) The solution is the same as pure water
d) The solution might be acidic or basic if unequal to start
Any substance that increases the concentration of H+ ions when it dissolves in water is a (an)
a) Acid
b) Base
c) neutral Solution
d) Salt Solution
Any substance that increases the concentration of OH- ions when it dissolves in water is a (an)
a) Acid
b) Base
c) Neutral Solution
d) Salt Solution
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