1 Nov. 2010
Take Out Homework: Week 8
Homework #1-20
 Objective: SWBAT review “the language
of chemistry” for a test.
 Do now: Write the formula equation for
the following word equation:
Solid lithium metal reacts with liquid water
to produce a solution of lithium hydroxide
and hydrogen gas.

Agenda
Do now
II. Homework check/Hand back papers
III. Questions?
IV. Review for test: complete Test Review
from Week 8 Homework
Homework: Finish Test Review, study for
test!
I.
Writing chemical equations for
reactions

http://www.youtube.com/watch?v=F54rq
Dh2mWA
How do chemists describe chemical
reactions?
 chemical equations: an expression
representing a chemical reaction

Word Equation

hydrogen gas combines (explosively!) with
oxygen gas to produce liquid water
 reactants: hydrogen, oxygen
 products: water
Formula Equations

H2(g) + O2(g)  H2O(l)
Reactants
Products
(s) – solid, (l) – liquid, (g) – gas
 (aq) – aqueous (dissolved in water)

Symbols in Equations
+ and, reacts with
  yields, produces, forms


You must be sure to write correct chemical
formulas for reactants and products!
Write the word equation
Na2O(s) + H2O(l)  NaOH(aq)
 Solid sodium oxide reacts with water to
yield a solution of sodium hydroxide

Write the formula equation
Solid copper (II) reacts with a solution of
silver nitrate to yield solid silver and a
solution of copper (II) nitrate.
 Cu(s) +AgNO3(aq)  Ag(s) + Cu(NO3)2(aq)

Practice
1.
2.
Zn(s) + HCl(aq)  ZnCl2(aq) + H2(g)
Solid magnesium reacts with oxygen gas
to yield solid magnesium oxide.
Complete the “Writing Word and Formula
Equations Classwork”
 Homework: Week 8 #

1.
2.
3.
4.
CS2(l) + O2(g)  CO2(g) + SO2(g)
Al(s) + ZnCl2(aq)  Zn(s) + AlCl3(aq)
Solid iron reacts with oxygen gas to
produce solid iron (III) oxide.
A solution of manganese (II) oxide reacts
with a solution of hydrochloric acid (HCl)
to produce manganese (II) chloride,
liquid water and chlorine gas.

Test Review