Mystery Science Cumulative Chemistry Unit Test

Emi drops a cup of baking soda into a glass container that has vinegar at the bottom of it. Then, she quickly puts a balloon on top of the container. What do you predict will happen to the balloon?

• The balloon will get bigger because it will become filled with solid (baking soda) particles that are too small to be seen.

• The balloon will get bigger because it will become filled with a liquid (vinegar) particles that are too small to be seen.

• The balloon will get bigger because it will become filled with gas particles that are too small to be seen.

• The balloon will stay the same because it will not become filled with anything.

Which of these substances is NOT an acid?

• lemon juice

• vinegar

• sulfuric acid

• distilled water

One of the alchemist's main goals was...

• creating magic potions because they were wizards.

• turning a "base metal" (like steel) into a "noble metal" (like gold) with hopes of becoming rich.

• creating explosions.

• They didn't have a goal, but instead mixed substances randomly just to see what happened.

SELECT ALL THAT APPLY: Chemical reactions can cause which of these occurrences?

• The formation of a new substance

• An explosion

• Temperature change

• A solid substance to dissolve over time

Laila has dull brown pennies and wants to make them look shiny and new. She mixes salt and vinegar together in a container and adds the pennies to the solution. She waits a few minutes, then takes them out and voila...they are shiny and new!

If Laila weighs the salt and vinegar solution and the pennies after the experiment, what do you think she will find?

• The solution will weigh more and the pennies will weigh less after the experiment.

• The solution will weigh less and the pennies will weigh more after the experiment.

• The solution will weigh the same and the pennies will weigh the same after the experiment.

• The solution will weigh the same and the pennies will weigh less after the experiment.

The alchemists claimed that "ordinary metals can be transformed into gold." Based on what you learned through experimenting with metals and acids, is this statement true or false?

• True

• False

When you left the steel nail and copper pennies in a bag of vinegar and salt, the nail turned copper-colored. What happened?

• The nail was transformed from steel to copper.

• The nail was covered with a thin layer of copper.

• A steel layer was removed from the nail, showing copper underneath,

All acids are dangerous.

• True

• False

SELECT ALL THAT APPLY: Why are acids used in food?

• To preserve food so it lasts longer.

• Acids are never used in food because acids are poisonous.

• They give food a sour taste.

• To change the color of food.

Which is NOT an example of a chemical reaction?

• Mixing baking soda and vinegar to produce carbon dioxide gas.

• The rusting of iron.

• The explosion that occurs inside of fireworks.

• Ice melting to become liquid.