Molecules & Conservation of Matter - GET YOUR NOTEBOOK OUT!

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I tell you this for a reason, even if you have no notes in it.

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2H₂ + O₂ = 2H₂0

(reactant) (product)

Do you understand that the reactant is on the LEFT side and the product is on the RIGHT side of the reaction?

_{(you may want to write this down in your notes immediately)}

• yes

• no

Do you understand that

2H₂O means

there are 2 molecules of water

_{(you may want to write this down in your notes immediately)}

• yes

• no

• what

Do you understand that

2H₂O means

there are 2 molecules of water...

made of 4 atoms of Hydrogen

_{(you may want to write this down in your notes immediately)}

• yes

• no

• what

Do you understand that

2H₂O means

there are 2 molecules of water...

made of 4 atoms of Hydrogen

and 2 atoms of Oxygen?

_{(you may want to write this down in your notes immediately)}

• yes

• no

• what

Do you understand that

2H₂O means

there are 2 molecules of water...

made up of 4 atoms of Hydrogen,

and 2 atoms of Oxygen?

...so basically the big 2 means multiply everything in that molecule

_{(you may want to write this down in your notes immediately)}

• yes

• no

• what

2H₂ + O₂ = 2H₂0

How many atoms of Hydrogen are in the reactant?

• 4

• 2

• 8

• 1

Tags

NGSS.MS-PS1-1

2H₂ + O₂ = 2H₂0

How many molecules of hydrogen are in the reactant?

• 2

• 1

• 0

• 4

Tags

NGSS.MS-PS1-1

What does the law of conservation of matter say?

• Matter is neither created nor destroyed in a chemical reaction.

• Matter is always destroyed in any ordinary chemical reaction.

• Chemical reactions always result in a heavier substance.

Tags

NGSS.MS-PS1-5

The mass of the products of a reaction will always equal what?

• The sum of the mass of the reactants

• You never can tell

• A bit more than the mass of the reactants