Question 1

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture in which the composition is uniform throughout.

Question 2

Which of the following is an example of a heterogeneous mixture?

Accepted Answer

Sand and water

Question 3

A solution is defined as:

Accepted Answer

A homogeneous mixture consisting of ions or molecules in the same phase.

Question 4

What is the molarity of a solution containing $$2$$ moles of NaCl dissolved in $$1$$ liter of water?

Accepted Answer

$$2\ \mathrm{mol/L}$$

Question 5

Which of the following statements about solubility is correct?

Accepted Answer

The solubility of oxygen in water decreases as temperature increases.

Question 6

A sample contains $$18$$ grams of water ($$\mathrm{H_2O}$$), and the formula mass of water is $$18. $$How many moles of water are present?

Accepted Answer

$$1$$ mole

Question 7

How many grams of water are present in $$2$$ moles of water ($$\mathrm{H_2O}$$), given that the formula mass of water is $$18$$?

Accepted Answer

$$36$$ grams

Question 8

Which of the following is NOT a method of disinfecting drinking water?

Accepted Answer

Aeration

Question 9

What is the main reason soaps and detergents are effective at cleaning greasy stains?

Accepted Answer

They have both polar and nonpolar parts, allowing them to interact with both water and grease.

Question 10

The nonpolar part of a soap molecule attracts 'grime' by which type of molecular interaction?

Accepted Answer

Induced dipole-induced dipole

Question 11

Which of the following best describes a suspension?

Accepted Answer

A heterogeneous mixture in which different components are in different phases.

Question 12

What is the concentration in ppm (parts per million) of a solution containing $$1 mg of $$solute in $$1$$ liter of solution?

Accepted Answer

$$1$$ ppm

Question 13

Which of the following is a consequence of hard water?

Accepted Answer

Lower cleaning action of soaps and detergents

Question 14

Which process is commonly used to convert salt water to drinking water?

Accepted Answer

Reverse osmosis

Question 15

During wastewater treatment, what is the main purpose of secondary treatment?

Accepted Answer

To aerate the water and allow fine particles to settle for removal

Question 16

A solution is said to be saturated when:

Accepted Answer

No more solute will dissolve in the solvent.

Question 17

If you dissolve $$5.9 g of $$NaNO$$_3 in$$ $$100 mL of $$water and then add more NaNO$$_3$$ until no more dissolves, what will happen to the excess NaNO$$_3$$?

Accepted Answer

It will precipitate out of solution.

Question 18

Which of the following best explains why cold polar oceans tend to be more fertile than warm tropical waters?

Accepted Answer

Cold water can dissolve more oxygen, supporting more life.

Question 19

Which step in water purification is primarily responsible for improving taste and smell?

Accepted Answer

Aeration

Question 20

What is the formula for calculating molarity ($$M) of a $$solution?

Accepted Answer

$$M = \frac{	ext{moles of solute}}{	ext{liters of solution}}$$

Mixtures and Classification of Matter – Conceptual Physical Science Chapter 16 Study Notes

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