Hands-On Lab Experience
Counting Atoms in Chemical Formulas
Law of Conservation of Mass
100

Why can't you eat elephant toothpaste?

Because it's toxic! XP (will induce severe forced-vomiting align with organ damage)

100

How many sodium atoms are there in this chemical formula? 3NaCl

There are 3 sodium atoms.

100

Does this equation follow the Law of Conservation of Mass? 2H2+O2→2H2O

Yes, they have the same amount of atoms on both sides so they're balanced.

200

How many tablespoons of dish soap do you need to make elephant toothpaste?

You need 1 tablespoon.

200

How many Hydrogen atoms are there in this chemical formula? 2CH3OH

There are 8 Hydrogen atoms.

200

Does this follow the Law of Conservation of Mass? CH4+O----> CO2+H2O

No, it doesn’t because the number of Hydrogen & Oxygen atoms aren’t equal.

300

How much Hydrogen Peroxide do you need to make elephant toothpaste?

You need 1/2 cup of Hydrogen Peroxide.

300

True or False?: Is this balanced? CH4+2O-----> CO2+2H2O

True (balanced)

300

Find X: 2NaCl(5.4g)+F2(X)→2NaF(4.9g)+Cl2(3.7g)

x=3.2g

400

Why does the "toothpaste" expand after being mixed?

Because the ingredients all mixed together form that specific chemical reaction.

400

True or False?: Is this balanced? 2FeO2+C -------> Fe+3CO2

False (unbalanced)

400

Find X: NaCl(40g)+H2O(20g)→NaOH(35g)+HCl(X)

x=25g