45 terms

Science//Chapter 7 Practice Test

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a liquid mixture in which particles can be seen and easily seperated by settling or filteration
suspension
how is a solute different from a solvent in a solution?
the solute is present in a smaller amount
when a few spoonfuls of sugar are mixed into a cup of water, sugar is the _________.
solute
a mixture containing particles that are too small to be seen easily but are large enough to scatter a light
colloid
how can a scientist safely tell whether an unknown solution is salt in water or sugar in water?
by testing the electrical conductivity of the solution
when a solid dissolves in water, ____________.
each of its particles becomes surrounded by water molecules
how would a solute affect the boiling point of water?
the water will boil at a higher temperature
when a solute is added to a solvent, the freezing point of the solution is ________________.
lower than the freezing point of either substance alone.
weak tea is an example of a _______________.
dilute solution
when you add so much solute that no more dissolves, you have a __________________.
saturated solution
what does it mean if a compound has a solubility of 15g in 100g of water at 0 degrees celsius?
15g of the compound will dissolve in 100g of water at 0 degrees celsius.
if two unidentified solids of the same texture and color have different solubilities in 100g of water at 20 degrees celsius, you could conclude that __________________.
they are different substances
a measure of how well a solute can dissolve in a solvent at a given temperature is that substance's _____________.
solubility
what is one way to increase the solubility of sugar in water?
heat the water
which is a characteristic property of acids?
they turn blue litmus paper red
acids are described as corrosive because they _____________.
"eat away" at other materials.
which is a likely use for a base?
making soap and detergents
in a water solution, how do acids differ from bases?
acids form hydrogen ions (H+), while bases form hydroxide ions (OH-)
in water, bases form ________________.
hydroxide ions
The pH Scale measures ______________.
the concentration of hydrogen ions
if you have a solution of a strong acid and a solution of a weak acid of equal concentration and volume, then the ____________________.
strong acid will have a lower pH
normal rainfall is slightly acidic, which means the pH scale must be ____________.
between 5 and 7
acids naturally present in food are safe to eat because they usually are _____.
weak
you can find the pH of a substance by using __________.
litmus indicator
neutralization is a reaction between an _______________.
acid and a base
what does a neutralization reaction produce?
water and salt
many of the uses of bases take advantage of their ability to react with ________.
acids
t/f: a SOLUTE is a mixture in which particles can be seen and easily separated.
False; suspension
t/f: A substance that is present in a solution in a smaller amount and is dissolved by the solvent is called the SOLUTE.
True
t/f: The particles in a SUSPENSION are larger than the particles in a solution but are still too small to be seen easily.
False; colloid
t/f: adding a solute to a solvent will RAISE the freezing point of the solvent.
False; lower
t/f: Because solubility is a characteristic property of matter, it can be used to help identify a substance.
True
t/f: Among the factors that affect the solubility of a substance are type of solvent, pressure, and TIME.
False; temperature
t/f: bases feel slippery and taste SOUR.
False; bitter
t/f: Bases form HYDROGEN IONS when dissolved in water.
False; (OH+)
t/f: The products of a neutralization reaction are ACIDS AND BASES.
False; salts and waters
t/f: Many vitamins in the food you eat are ACIDS.
True
use the pH scale to compare an apple and a lemon
An apple is less acidic than a lemon.
why would you expect soap to taste bitter?
It's a base
What does the pH of drain cleaner tell you about the dangers of such a product?
It is very basic
What color would litmus paper turn in a solution of baking soda? Explain your answer in terms of pH.
red litmus paper would turn blue; because its a base.
What does the pH of water tell you about how the water differs from the other items shown in the diagram?
water is neutral; nothing else is neutral
in terms of pH, explain what would happen if you mixed vinegar with a solution of ammonia. what type of products would you form?
you would get water and a salt; neutralization
What happens to the concentration of sugar in maple sap as the sap is boiled?
the concentration of sugar increases
In 100 grams of water at 0 degrees celsius, table sugar has a solubility of 180 grams. What will happen if you add 100 grams of table sugar to 50 grams of water at 0 degrees celsius?
90 grams of table sugar will dissolve but 10 grams will not.
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