Inferring From Evidence: Acids And Bases! Trivia Quiz

1. What would the colour universal indicator turns when added to pure water tell us about a property of water? (INFERENCE)

Water is an acid

Water is a neutral substance

Water is weakly acidic

2. [The next few questions require foreknowledge about: pH and universal indicator. If you have never used universal indicator solution, look it up before continuing]

We test the pH of lemon juice with universal indicator solution, and it turns a red colour. What can we INFER (figure out/deduce) about lemon juice?

It is an alkalai

It is an acid

It is a base

It turns universal indicator red

Red is the colour of lemon juice

3. Why does putting baking soda on a bee sting help to ease the pain?

Because baking soda soothes the wound; bee stings are basic and strong bases can hurt

4. Water is a substance that is known to have a pH of around 7. The word for this is...

Neural

Neutron

Neutral

Neutralisation

5. Some students mixed hydrochloric acid (HCL) and the base sodium hydroxide (NaOH) together. The added universal indicator to the resulting mixture and it turned light green. What can they infer about what happens when an acid is added to a base from this experiment?

That acids and bases turn universal indicator light green

That acids and bases react together to form a new substance or substances that are neutral

That acids and bases don't react chemically

6. Some students mixed hydrochloric acid (HCL) and the base sodium hydroxide (NaOH) together. The added universal indicator to the resulting mixture and it turned light green.

They then took that resulting mixture and poured it into an evaporating dish. They evaporated all the water and were left with a white substance that looked like crystalised table salt.

Their teacher confirmed the white substance was table salt.

Which word equation accurately represents the chemical reaction above (hint: evaporation is NOT a chemical reaction, is is a method of separating two substances)

Hydrochloric acid + sodium hydroxide --------> water + sodium chloride

Salt water --------> water + sodium chloride

Hydrochloric acid + sodium hydroxide --------> salt water

Sodium chloride + water --------> acid + base

7. Some acid-base neutralisation reactions produce carbon dioxide (a gas). Think back to experiments you have done in class and decide which of these might be producing carbon dioxide....

Lemon juice and baking soda

Vinegar and lemon juice

Vinegar and baking soda

8. What colour would universal indicator turn if it was added to pure water? (OBSERVATION)

Orange

Blue

Red

Light green

9. If you spilt an acid on your hand in Science class, what should you do?

NOTE: always report accidents/spills involving acids/breakages to your teacher.

Get the teacher to put a weaker acid such as vinegar on your hand

Get the teacher to put a weaker acid such as baking soda on your hand