Review

What are some examples that show that an acid is reactive? Choose ALL possible answers.

• Metal can dissolve.

• The substance will bubble or fizz.

• Gold is created.

• There will be a color change.

• Smoke can form.

Why are some acids used in food?

• To sweeten the food.

• To make it salty

• So there will be a sour taste.

• So there will be a bitter taste.

Are all acids dangerous?

• Yes, all acids are dangerous because the dissolve metal.

• No, all acids are not dangerous. We can eat and drink things with acid.

What are some examples of mild acids people can eat or drink? Choose all possible answers

• Vinegar

• orange juice

• baking soda

• Lemons or lemon juice

How can you make a dull penny shiny?

• Dip it in vinegar.

• Wash it with soapy water

• Put it in salt and water.

• Dip it in a vinegar and salt solution.

What causes shiny pennies to become dull?

• They turn dull because they get dirty.

• They turn dull when exposed to air over time (Oxidation).

• They turn dull because they are just old.

• They are dull to begin with.

Who were the alchemists?

• A group of people who didn't trust a guy named Al.

• A group of people long ago who tried to turn ordinary metal into gold using different liquids and experimentation.

• A band.

• A group of scientists in the 1950's who created penicillin.

The alchemists claimed that ordinary metals can be transformed into gold. Is this claim true? Why or Why not?

• This claim is not true. Metals can be coated with other metals; not transformed.

• This claim is true! My steel nail is now gold.

• This claim is not true. No explanation necessary.

• This claim is true. Where is gold coming from, if not from alchemists?

Which substances helped you decide whether or not another substance was an acid or not?

• Salt and pepper

• Soap and water

• Baking soda and the purple liquid

• mustard and soy sauce

Which of the following is the best description of the results of a chemical reaction?

• A new substance with different properties is formed.

• The substance seems to disappear after dissolving in water.

• The substance changes from liquid to solid at a low temperature.

• The reaction can be reversed to get back the original substance.