Lab: Measuring pH — Unit test Answers

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21
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Which factor increases the rate of dissolution in an unsaturated solution?

A
increasing the temperature
B
decreasing the surface area
C
decreasing the amount of solute
D
increasing the amount of solvent
22
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Milk is a heterogeneous mixture that contains different types of particles in different phases. Due to the sizes of the particles in milk and the way they are dispersed, the particles do not easily settle out. They also cannot easily be filtered out.Therefore, milk is best described as a

A
solution
B
suspension
C
compound
D
colloid
23

Which best describes the definition of Lewis acids and bases?

A
a general definition based on electron structure
B
a general definition based on hydrogen ion concentration
C
a specific definition based on a compound’s ability to accept protons
D
a specific definition based on a compound’s ability to donate protons
24

A chemist dissolved crystals of an unknown substance into water at room temperature. He found that 33 g of the substance can be dissolved into 100 mL of water. What property of the unknown substance was the chemist most likely investigating?

A
its solubility
B
its rate of dissolution
C
its chemical reaction to water
D
its reaction to temperature changes
25

Which solution is a homogeneous mixture?

A
sand and water
B
salt and water
C
salad dressing
D
soil

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