QUESTIONS

Question 1

Which of the following solutions would you consider acidic?

pH 4
pH 7
pH 8
pH 10

Question 2

If you were to dissolve 2.5 grams of NaCL in 150g of water, I would call the NaCL the:

Solute
Solution
Mixture
Solvent

Question 3

I mix tow liquids together and shake them up. I see that I have microspcopic droplets of one liquid suspended in the other. I would call this

Solute
Mixture
Solvent
Emulsion

Question 4

Let us think back to our original cup of tea. We remove the teabag from the cup of tea pictured above. Do you think that this cup of tea is a homogenous or heterogeneous solution? Assume when the teabag is removed, no tea leaves remain in the cup.

Homogenous
Heterogenous

Question 5

Based on the characteristics in the table below, determine how you might classify each of these simple solutions by dragging each simple solution to the proper category.

Classification	Distinguishing Characteristics	Example
Solution	Solute particles cannot be visually distinguished from solvent or one another. Cannot be separated by a membrane or by setting out. Usually transparent.	Saltwater
Colloidal Suspensions	Contains particles large enough to scatter light, and appear cloudy. Can be separated by a membrane but NOT by settling out. Often have gel like consistencies.	Silica nanoparticles in water
Emulsions	One liquid suspended, but not dissolved in another liquid. Often one liquid is water based and the other is old based.	Homogenous mixture of oil and water

Solutions
Colloidal Suspensions
Emulsions

Question 6

Buffers

Drag the outcomes to the correct beaker

Beaker 1: water

Beaker 2: phosphate buffered solution

Question 7

You have a mixture that consists of small droplets of olive oil suspended in another liquid. The mixture seems stable. I would call this mixture.

Emulsion
Solvent
Solution
Colloid

Question 8

Seven grams of a salt is dissolved in eight hundred ml of water. The water would be considered the:

Colloid
Mixture
Solute
Solvent

Question 9

You add a few drops of a strong acid to a beaker of liquid with a pH of 4.6. After you add the drops of strong acid, the pH remains 4.6. I would estimate that the liquid in the beaker as a:

Buffer
Emulsion
Solvent
Solution

Question 10

In a chemical reaction, H3PO4 reacts with another substance and becomes H2PO4-. Based on this, I would expect that this compound acted as;

A base in this reaction
A solution in this reaction
An acid in this reaction
A solute in this reaction.

Question 11

Which of the following is not a key property of water?

Water is able is dissolve many substances
Water molecules are able to stick to nearby molecules in a process known as cohesion.
Water can participate in many chemical reactions.
Water has a high heat capacity (ability to absorb heat)

Question 12

Select all the following solutions that would be expected pH values for basic solutions? Select all that apply.

pH 9
pH 7
pH 10
pH 12
pH 5

ANSWERS

Question 1

Which of the following solutions would you consider acidic?

pH 4
pH 7
pH 8
pH 10

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(Answered) BIOS251 – Unit 2 – Inorganic Compounds and Solutions Edapt