Chemical Reactions
What is a chemical reaction?
A change where where the starting chemicals are used up and new chemicals are made.
What kind of light makes tonic water glow?
A black light (UV).
Is lemon juice an acid or a base?
An acid.
What two ingredients made milk plastic?
Milk and vinegar.
True or False: You should taste the chemicals to figure out what they are.
False!
What gas made the exploding chalk bags blow up? (Hint: baking soda and vinegar).
Carbon dioxide
What is it called when something glows under UV light?
Fluorescence
Is baking soda solution acidic, neutral, or basic?
Basic.
What colour does iodine turn when starch is present in a food?
Dark blue, purple or black.
What safety equipment should you wear during an experiment that explodes?
safety googles or glasses
What does a catalyst do in a chemical reaction? (Hint: what did the yeast do?)
Speeds up a chemical reaction
What happened when sunscreen was placed between the UV light and tonic water?
The glow became dimmer because sunscreen blocked and absorbed UV light.
What tool did we use to measure pH?
pH strips.
Name three food that contains lots of starch.
Potato, Bread, Pasta, Crackers (and more!)
What should you do immediately if something spills?
Tell an instructor and help clean up the spill.
What observations can you make that help you see that at chemical reaction is happening?
How does Chromatography separate chemicals?
Chemicals (or colours) into different lines based on chemical size.
Which number is neutral on the pH scale?
7
Why didn't the liquids in the density tower mix?
They have different weights, densities and chemical properties that prevent them from mixing.
Why should you be careful when using iodine?
It will stain your clothes!
If a chemical reaction gives off energy, what happens to the temperature? (how does it feel when you touch it?)
warm or hot!
Vitamin B2
In Save the Pond, what pH were we trying to reach to make it safe for fish?
About 6.5
Which liquid stayed on top of the density tower?
Rubbing alcohol (Isopropyl alcohol)
Name 2 important experiment safety rules.
Possible answers: