Describing Chemical Reactions (6.1)

What kind of chemical reactions can you think of?

What kind of chemical reactions can you think of? - burning wood - baking soda and vinegar - diet coke and mentos - rust on your car

How about? When I heat copper (II) carbonate, it becomes carbon dioxide and copper (II) oxide.

How about? When I heat copper (II) carbonate, it becomes carbon dioxide and copper (II) oxide. That’s harder to remember!

Word Equations This is a little easier energy + copper(II) carbonate  carbon dioxide + copper(II) oxide

Word Equations This is a little easier energy + copper(II) carbonate  carbon dioxide + copper(II) oxide

Word Equations This is a little easier energy + copper(II) carbonate  carbon dioxide + copper(II) oxide reactants products on the left on the right

Chemical Equations A chemical equation gives even more information. Energy + CuCO3 (s)  CO2 (g) + CuO (s)

Chemical Equations A chemical equation gives even more information. Energy + CuCO3 (s)  CO2 (g) + CuO (s) (s) tells us that is a solid. (g) = gas and (l) = liquid.

Chemical Equations A chemical equation gives even more information. Energy + CuCO3 (s)  CO2 (g) + CuO (s) (s) tells us that is a solid. (g) = gas and (l) = liquid. also (aq) = aqueous which means dissolved in water

Chemical Equations are used extensively so we need to be comfortable with them.

Guidelines #1 left (reactants)  right (products)

Guidelines #1 left (reactants)  right (products) #2 If there is more than one reactant or product, use a ‘+’ in between.

Guidelines #1 left (reactants)  right (products) #2 ‘+’ means ‘and’. #3 The  arrows is read as: ‘produces’, ‘yields’ or ‘forms’

Guidelines #4 Energy on the reactant side means energy is required to make the reaction go.

Guidelines #4 Energy on the reactant side means energy is required to make the reaction go. #5 Energy on the product side means energy is released.

Oral Practice Iron + sulfur  iron (II) sulfide + energy

Oral Practice Iron + sulfur  iron (II) sulfide + energy Did you say “ iron and sulfur react to produce iron two sulfide and energy is released” ?

Whiteboard practice What is the name for CuSO4 ?

Whiteboard practice What is the name for CuSO4 ? Did you say... copper (II) sulfate ? Remember...

CuSO4 ? +1 +2 -2 Cu SO4

CuSo4 ? +1 +2 -2 Cu So4

Try this... Can you write the word equation for this... When I add zinc to aqueous copper (II) sulfate it gets warm and I’m left with bits of solid copper and aqueous zinc sulfate.

Zinc + copper (II) sulfate  zinc sulfate + copper + energy

Zinc + copper (II) sulfate  zinc sulfate + copper + energy Now...write the chemical equation! You can do it!

Zn (s) + CuSo4(aq)  ZnSo4(aq) + Cu(s) + energy Did you get some of that?

Zn (s) + CuSo4(aq)  ZnSo4(aq) + Cu(s) + energy Did you get some of that?

Sodium (solid) is added to solid iron (III) oxide and it creates sodium oxide which is a solid and pure iron.

Na(s) + Fe2O3 (s)  Na2O (s) + Fe (s)

Homework P. 227 # 1,2,3,4