# Honors Chemistry Week 7

Make sure to take notes on the videos. We are taking a practical look at chemistry in action

Vocabulary: (know the definitions)

• Limiting Reactant
• Conversion factor
• Excess Reactant
• Molar Mass Formula (g/moles)

## Day 2: Watch the Videos

• Video: DRAG RACING CO2 Powered Car VS Supercharged Coke Can
• When we have fire, a combustion reaction, what are the products?
• Which one moved the car?
• Why did one car move faster then the other?
• What part did engineering play in how well the plane worked?
• Note: Don’t say “a lot” be specific
• Since you don’t have access to CO2 cartridges, we will make our own CO2 by mixing vinegar and baking soda.
• Video: Jet Powered Boat Science Experiment
• Video: DIY Baking Soda & Vinegar Rocket!
• In the two vinegar and baking soda videos did they use the same ratio of vinegar to baking soda?
• Why or why not?
• Activity: Wait, Weight Don't Tell Me
• Did you guess correctly?  Remember it’s the law of conservation of Mass.
• Can you use the day one math to figure out how much you should use so you don’t have a limiting or excess reactant?
• Let’s assume the given is 5 g of vinegar (C2H4O2)
• The balanced equation is C2H4O2 + NaHCO3 -> CO2 + Na2 CO3 + H2O
• So now I must put a new measurement in for the amount or 5g of C2H4O2, while the equation was balanced now its not.
• Rebalance the equation and figure out the ratio for ever 5g of vinegar how many g of baking soda do I have?
• Now if you were making a fuel for your boat you would replace the 5 with however many grams of vinegar you are going to use; that is your new given.
• Start with your given, how much vinegar do you want to use, you want to figure out how much baking soda you need to balance it.
• Hint: amount of vinegar in ml x conversion factor = amount of grams of baking soda.
• Once you figure out the ratio you can change the amount of vinegar and just use the ratio to figure out how much baking soda you need.
• Example a ratio of 5g/1g is the same as 15g/3g. Do you see the pattern and why ratios are such a help to us?

## Day 3

• Video: Mr. B's 3 Steps to Building
• Decide if you want to build a boat, rocket or car.
• Remember a thin wall is easy to break
• Watch a video to figure out the supplies you will need.
• Get the materials or figure out replacements

## Day 5

If we were in school, we would pick teams and build a CO2 boat. You would then race them against other classes.

• We had Memorial day for day 1, if you just get all the videos and math done and want to build the boat this weekend and show me next week, I understand.
• I do want to see video of you launching your vehicle!

Write up a short paper explaining what you did each day this week and what you learned.

• Take a picture and send it to: bartlett@wcskids.net
• Make sure to include your name, hour and week 7.

## You're done for the week!

Make sure I get your work by Saturday