Ch. 4 Solutions and the Environment

Concentration refers to a product that has...

• equal parts solute and solvent

• more solvent per volume of solute

• more solute per volume of solvent

• more solvent per volume of solution

Answer explanation

Remember that concentrated products, like orange juice concentrate, need water before they are ready to be consumed

How is a concentrated product like instant coffee made?

• By adding more solute

• By adding more solvent

• by removing most or all of the solute

• by removing most or all of the solvent

Answer explanation

If you got the incorrect answer check back in the Unit A slide 117 or on page 60 of your textbook

Draw and label a concentrated solution and a dilute solution

Answer explanation

Your drawing should end up looking something like this.

The concentrated solution should have less water and more solute particles. Your dilute solution should be the opposite

Which of the following are environmental advantages of buying concentrated products? (Hint there is more than one correct answer)

• They are easier to transport

• They are cheaper than non concentrated products

• The require less packaging

• They do not spoil, or they take longer to spoil

You come across an unknown substance that is colourless and odourless. You take some red litmus paper and dip it into the substance. It does not change colour. Is that substance an acid or base?

• Acid

• Base

Answer explanation

Red litmus paper that does not change colour indicates that the substance is an acid.

Give 1 property of a base

Which of the following substances tastes sour?

• Acids

• Bases

• Salts

• All

Answer explanation

One of the properties of an acid is that it tastes sour. Think about lemon juice. Very acidic and very sour.

Which is more basic?

• Baking Soda

• Bleach

Answer explanation

The pH of baking soda is around 8. The pH of household bleach is 11-13 depending on the concentration.

Strong acids are corrosive but strong bases are not

• True

• False

Answer explanation

Substances on either end of the pH scale are considered strong acids or bases and are corrosive.

To identify acids and bases we use

• litmus paper

• our nose

• indicators

• our tongue