Transcript Ch 11 Test Hints

Ch 11 Test Hints – Chemistry
Balancing Equations
1) Define/identify what
chemical reactions are
You should be able to explain what happens to atoms in a chemical
reaction.
2) Describe what a chemical
equation shows.
Make sure you understand the difference between a
chemical EQUATION and a chemical reaction.
3) Define skeleton equation.
This is one of those “which of the following is NOT”
type of questions. Make sure you understand the
difference between the skeleton and the balanced
equation.
4) Define catalyst.
What does a catalyst do in a reaction and what does
the catalyst “look” like at the end of the reaction?
5) Identify the correct skeleton
equation given a word
description of the reaction.
You need to be able to identify the reactants and
products from a written description of a chemical
reaction. Again, you need to know how a skeleton
equation is different from a balanced equation.
See p. 324 practice problem #2 in your book. P. 329 #10
& 11 give you great chances to practice this! Whoo!
6) Write a balanced equation
from a word equation.
We will give you the specific reactants and products in
words, you just have to write the formulas AND
BALANCE it!
Check out the many balancing equations worksheets
that we did for a bunch of examples.
See p. 328, practice problem #6
7) Balance a skeleton
equation.
.
p. 328 practice problem 5 and #12 on p. 329 –
exactly the same thing!!
8) Identify what is equal on both
sides of a chemical equation
(how do we know an equation is
balanced?)
As in, what are you counting??????
9) Balance a skeleton equation.
Formulas are given, you have to count and balance.
Check your many balancing worksheets.
p. 347 #43 has 4 awesome opportunities to practice
balancing AND the answers are in the back of the book.
10) Balance an equation given a
word description of the reaction.
Make sure you practice double replacement
reactions and go back over Lab 15.
11) Identify the more active
reactant in a single replacement
reaction
You need to know which element can replace
the other. Check your Fe + CuSO4 lab. Why
could Fe replace Cu? (and why can’t it replace
SO4 ?)
12) Identify the possible
products in a combustion
reaction.
This is another “products of a combustion
reaction do NOT include…” type of problem. If
you know the 2 super-common products of ALL
combustion reactions, this should be a cinch!
13) Describe the reactants and
products in a double
replacement reaction.
You need to know what KINDS of compounds
are involved in this type of reaction.
See Lab 15 again for some examples 
14) Write the balanced equation
for the decomposition of a metal
oxide.
Ok. We were totally serious when we said you
have to know ALL 6 kinds of decomposition
reactions, not just that decomposition means
breaking down. PLUS you need to identify the
correctly-balanced equation.
15) Complete a balanced double
replacement reaction given the
reactants.
This is a reaction prediction problem. We
practiced these on several worksheets and Lab
15. Make sure you go back and watch the
podcasts on Moodle for double replacement
(same as double displacement)
16) Balance a combustion
reaction given the fuel (the stuff
that is burning)
You MUST know the other reactant and the
only 2 possible products of a combustion
reaction. We even give you 2 big giant hints on
how to set up and balance this equation right in
the question.
17) Complete a balanced single
replacement reaction given the
reactants
You need to consider the activity series on this
one for sure!!
Remember that metals replace metals and
nonmetals replace nonmetals.
18) Predict the products of a
double replacement reaction
given the reactants.
The formulas of the reactants are provided, but
you need to know what they form in this type
of reaction.
You absolutely, positively MUST know how to
write correct chemical FORMULAS before you
try to balance this.
19) Identify the type of reaction
given a balanced chemical
equation.
You need to know the general form of all 5
types of reactions. This one will be pretty
straightforward. You will be given a balanced
chemical equation and have to tell what kind it
is.
20) Identify the type of reaction
given a balanced chemical equation.
You need to know the general form of all 5
types of reactions. This one will be pretty
straightforward, we have done a lab that is
similar. You will be given a balanced chemical
equation and have to tell what kind it is.
21) Identify the type of reaction
given a balanced chemical equation.
You need to know the general form of all 5
types of reactions. This one will be pretty
straightforward. You have done a lab with many
similar reactions! You will be given a balanced
chemical equation and have to tell what kind it
is.
22) Identify the balanced equation
given the word description of the
reactants.
We will give you the names of the reactants and you
have to be able to predict the products. See the
Reaction Types and Reaction Prediction worksheets for
lots of examples. Your book will help too!!
When you carefully consider each answer choice, be
sure to look for correctly-written chemical formulas and
then correctly balanced equations.
23) Identify the driving force (why
the reaction occurs) in a double
replacement reaction.
You need to know why single and double replacement
reactions occur. One type has to do with the activity
series and the other has to do with solubility rules .
There are great charts for both of these in your book !
Check out the podcasts again on our Moodle pages.
They give you great examples as well.
24) Balance an equation given the
skeleton equation.
Short answer problem time!
This problem will give you a word AND a skeleton
equation. You just have to balance it with coefficients.
This is an “everyday model” example.
25) Write the balanced equation for a double
replacement reaction given the reactants.
Short answer.
You will be give the correct formulas of the
reactants. You have to write the correct
formulas of the products and then balance.
26) Balance the skeleton equation.
Short answer.
You will be give the correct formulas of the
reactants. You have to write the correct
formulas of the products and then balance.
You will also have to tell what KIND of reaction
this is!
27) Write the balanced equation for a single
replacement reaction given the reactants.
Short answer.
You will be give the correct formulas of the
reactants. You have to write the correct
formulas of the products and then balance.
28) Write the balanced equation for the
decomposition reaction given the reactants.
Short answer.
You will be give the correct formulas of the
reactants. You have to write the correct
formulas of the products and then balance.
29) Write the balanced equation for the
combination reaction given the reactants.
Short answer.
You will be give the correct formulas of the
reactants. You have to write the correct
formulas of the products and then balance.
30) Write the balanced equation for the
combustion reaction given the reactants.
Short answer.
You will be give the correct formulas of the
reactants. You have to write the correct
formulas of the products and then balance.