Stoichiometry: Gram to Gram

True/False: Before you begin, you must be sure your equation is balanced

• True

• False

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NGSS.HS-PS1-7

From the video, what does "excess air" mean

• That there isn't enough air, we need to worry about it.

• That there is more than enough air, we don't even have to consider it.

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NGSS.HS-PS3-4

When the speaker balanced the equation, he went back and doubled the numbers - placing a 2 in front of C₂H₁₈....Why?

• Because he likes the number 2

• Because it makes the equation look better

• Because we want whole numbers, not decimals

• There was no reason

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NGSS.HS-PS1-7

Molar mass has nothing to do with the coefficients in the balanced equation

• True

• False

Converting from gram A to gram B, the first step is to

• Convert from mole A to mole B

• Convert from mole B to gram B

• Convert from gram A to mole A

When converting from gram to gram, how many steps are there

• 1

• 2

• 3

• 4

When you multiply for each step you are using a fraction, called a

• conversion factor

• percentage

• multiplier

• prefix

To remember steps, no matter what.....what always goes in the upper left and bottom right of our conversion factors

• 1 gram

• 1 mole

• the coefficient

• the name

Converting from grams C₂H₁₈ to grams CO₂ , the first conversion factor has grams of what on the bottom

• C₂H₁₈

• CO₂

• O₂

• H₂O

The middle conversion factor is the

• mole ratio of C₂H₁₈ to CO₂

• molar mass of CO₂

• molar mass of O₂

• combination lock of your locker

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NGSS.HS-PS1-7