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- 1. Multiple Choice
How can a scientist safely tell whether an unknown solution is salt in water or sugar in water?
taste the solution
smell the solution
test the electrical conductivity of the solution
filter the solution
- 2. Multiple Choice
If two unidentified solids of the same texture and color have different solubility in 100 grams of water at 20C, you can conclude that...
They are the same
They are different
They have different melting points
The solubility will be the same if the water temperature is increased.
- 3. Multiple Choice
When a solid compound dissolves in water, …
each of its particles are surrounded by water molecules.
its particles surround individual water molecules.
- 4. Multiple Choice
What does it mean if a compound has a solubility of 15g in 100g of water at 0C?
100g of the compound will dissolve in 15g of water at 0C.
15g of the compound will dissolve in 100g of water at 0C.
The compound will not dissolve until 15g of it are present.
The compound will dissolve only if the water temperature is 0C.
- 5. Multiple Choice
Table sugar and table salt are examples of ...
atoms
elements
mixtures
compounds
- 6. Multiple Choice
Substances that cannot be broken down chemically into other substances are...
elements
compounds
mixtures
solutions
- 7. Multiple Choice
All elements are composed of extremely small particles called..
compounds
mixtures
atoms
molecules
- 8. Multiple Choice
Which of these statements is false?
Oxygen and copper are examples of elements.
Elements are pure substances.
Atoms of different elements can combine to form compounds.
Atoms of different elements are the same.
- 9. Multiple Choice
Weak tea is an example of a...
dilute solution
concentrated solution
suspension
solvent
- 10. Multiple Choice
When you add so much solute that no more dissolves, you have a
saturated solution
unsaturated solution
neutralization
suspension
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