Types of equations

Write a balanced formula for:

• When solid aluminum reacts with an aqueous solution of potassium hydroxide, it forms aluminum hydroxide in solution and an potassium solid.

Al (s) +3KOH Al(OH)3 + 3K

Charades

I will need 4 volunteers!

Endothermic vs Exothermic

• Endothermic rnx- take in heat energy (cooling)

– Energy as a reactant

• Exothermic rnx- these give off energy (hot rnx)

– Energy as a product

• Real life examples? ?

• Decomposition-

2H2O2 (aq) 2H2O (l) + O2 (g)

To make this rnx go faster you would add MnO2 but it would not be a reactant.

This is called a Catalyst helps the reaction go faster.

• Single replacement

2AgNO3 (aq) + Cu (s) 2Ag (s) + Cu(NO3)2 (aq)

This rnx shows Ag switch with Cu ONLY.

• Double replacement

AgNO3 (aq) + KI (aq) AgI (s) + KNO3 (aq)

This rnx shows the Ag and the K switch.

• Synthesis

• 2Mg + O2 2MgO + light (energy)

Extra Credit 2 ptbalance:

SF4 + I2O5 IF5 + SO2