Counting Bonds in a Cool Rxn

Balancing Equations

100

4NH₃ + _O₂ → 4NO + 6H₂O

5

200

4FeS₂ + _O₂ → _Fe₂O₃+8SO₂

11; 2

300

2Ca₃(PO₄)₂ +_SiO₂ + _C → P₄ + _CaSiO₃+10CO

6; 10; 6

400

K₂Cr₂O₇ +14HCl → _KCl + _CrCl₃ + _Cl₂ + 7H₂O

2; 2; 3; 7

Pronunciation Challenge

100

Cyanocobalamin

sigh-ANN-oh-co-BAL-uh-min

200

Methylchloroisothiazolinone

meth-ill-klor-oh-eye-so-thi-ah-zoe-lin-own

300

Ixekizumab

ks-EE-ki-joo-mab

400

Polyaminopropyl biguanide

pol-ee-am-in-oh-pro-pil-big-wan-ide

Endo or Exo?

100

Our reaction

Endothermic!

200

Melting ice

Endothermic; ice absorbs thermal energy to melt

300

Photosynthesis

Endothermic; plants take in light energy in the process

400

Neutralization Reaction

Exothermic; super-stable H2O is formed by H+ and OH-, releasing a high amount of energy that causes net energy to be positive