I can observe and explain the Law of Conservation of Mass.

I can ask scientific questions about observations and formulate hypotheses.

I can interpret my observations from the lab activity and compare them to my hypothesis.

I can write out chemical equations based on demonstrations or lab experiments.

I can explain why the demonstration had the results that it did. (no change in mass)

I can state the purpose and for my lab experiment and report.

I have answered whether or not my prediction was correct and why or why not this is so.

I have written down the chemical and/or word equation for the demonstration.

I can use diagrams to show atoms and molecules.

I can use diagrams to model chemical reactions.

I can balance chemical equations and explain why they are balanced.

Mass CANNOT be created or destroyed.

In a chemical reaction, the total mass of the reactants is ALWAYS the same as the total mass of

the products. This is the definition of the Law of

Conservation of Mass.

The number of each type of atom is the SAME before and after a chemical reaction. The atoms of the reactants are RE-ARRANGED to form the products.

Molecules can be split apart to form new molecules BUT the atoms in the products are the same atoms that were in the reactants.

NEVER CHANGE THE CHEMICAL

FORMULA!!!

You can ONLY add coefficients!

3PO4

coefficient chemical formula

Step 1:

COUNT all the atoms on each side of the equation. Break up polyatomic ions into elements. Make a chart to record the number of atoms present for each side of the equation.

Step 2:

Always START balancing with the METALS, then the non-metals. Leave oxygen and hydrogen until the end.

Step 3:

Add a COEFFICIENT (big number) in front of the chemical formula that needs to be balanced, so that the number of atoms of each element on the reactant side is the same as those on the product side.

NOTE:

Each time you put a coefficient in the equation, you must RECOUNT the atoms on both sides before you continue to add any other coefficient.

Step 4:

CHECK that your equation is balanced when you are finished.

Example

Na + Cl2 NaCl

Reactants Products

Example

Na + Cl2 NaCl

Reactants Products

Na Cl

Na Cl

Example

Na + Cl2 NaCl

Reactants Products

Na 1 Cl 2

Na 1 Cl 1

Example

Na + Cl2 2NaCl

Reactants Products

Na 1 Cl 2

Na 1 Cl 1

Example

Na + Cl2 2NaCl

Reactants Products

Na 1 Cl 2

Na 1 2 Cl 1

Example

Na + Cl2 2NaCl

Reactants Products

Na 1 Cl 2

Na 1 2 Cl 1 2

Example

2Na + Cl2 2NaCl

Reactants Products

Na 1 Cl 2

Na 1 2 Cl 1 2

Example

2Na + Cl2 2NaCl

Reactants Products

Na 1 2 Cl 2

Na 1 2 Cl 1 2

I can create ionic and covalent bonding diagrams/ I can create diagrams to show balancing in chemical reactions.

I can look at a chemical equation and balance it by changing the coefficients.