ASU CHM 101 Chapter 4 Chemical
Reactions
1NA2 + 3H2 --> 2NH3
Balance the following equation by filling in the blanks (use a 1 if needed)
2NaCl + 1F2 --> 2NaF + 1Cl2
Balance the following equation by filling in the blanks (use a 1 if needed)
4P + 5O2 → 2P2O5
Balance the following equation by filling in the blanks (use a 1 if needed)
2C8H18 + 25O2 --> 16CO2 + 18H2O
Fill in the blank to balance the equation (use a 1 if needed):
1FeCl3 + 3NaOH --> 1Fe (OH)3 + 3NaCl
Fill in the blanks to balance the equation (use a 1 if needed):
2NaBr+ 1CaF2 --> 2NaF + 1CaBr2
Fill in the blanks to balance the equation (use a 1 if needed):
, Two hydrogen atoms combine with one oxygen molecule to produce two water
molecules
H2 + O2 --> 2H2O
Explain this in words
2Al + 3CuCl2 --> 2AlCl3 + 3Cu
1- Write a skeletal equation by writing the formula of each reactant and product
Al + CuCl2---> AlCl3 + Cu
Count the number of atoms of each element on each side of the equation
polyatomic ions may often be counted as if they are one "element"
2- Pick an element to balance Al or Cu
if an element is found in only one compound on both sides, balance it first
leave elements that are free elements somewhere in the equation until last
3- Find the Least Common Multiple of the number of atoms on each side
the LCM of 3 and 2 is 6
4- Multiply each count by a factor to make it equal to the LCM
Use this factor as a coefficient in the equation
if there is already a coefficient there, multiply it by the factor
it must go in front of entire molecules, not between atoms within a molecule
5- Recount and Repeat until Balanced
Write a balanced chemical equation for the following description:
Aluminum metal reacts with copper (III) chloride to produce aluminum chloride and
copper metal
Formation of Gas
Which of the following show evidence of a chemical reaction?
-Formation of Gas
-Evaporation
-Condensation
What does l refer to when placing phases within a chemical equation?
Liquid
3 multiple choice options
Potassium chlorate
or
KClO3
Identify the following reaction:
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