Writing Equations from Words
BELLWORK:
6K + B2O3  3K2O + 2B
1. In the above reaction, circle the reactants and box the products. Label one coefficient and one
subscript.
2. The coefficient in a chemical equation tells us how many ____________________________ are present while
the subscript in a chemical equation tells us how many ___________________ are present.
3. How many K2O molecules are present at the end of the reaction? _________
4. How many potassium atoms are found on the products side of the equation? __________
5. Is this equation balanced? ____________________________
Putting it all together: using what you learned in the last chapter, write the following equation with the
NAMES of the chemicals.
MgCl2 +
LiF →
MgF2 +
LiCl
______________________________________ reacts with _______________________________ to form
______________________________________ and ____________________________________.
Now balance the equation!
Diatomic Elements
There are seven elements that are diatomic (di = ___________ atomic = ______________ so diatomic means
__________________________________).
It’s easy to remember them! They form the number 7
on the periodic table, plus H.
They are only diatomic when they are ALONE, existing
as an independent element.
Write the seven diatomic elements below.
1.
2.
3.
4.
5.
6.
7.
Writing Equations from Words
In the last unit, you learned how to write chemical formulas and how to name them. Now we’ll combine
that knowledge with what you know about chemical equations.
1. Write the formulas of the following chemicals in the form of a chemical equation. Don’t forget the
diatomic elements you just learned!
2. Balance the equation.
Example:
1. Sodium reacts with chlorine gas to produce sodium chloride
2 Na + Cl2  2NaCl
Now you do it!
2. Nitrogen gas reacts with oxygen gas to produce nitrogen monoxide
3.
Hydrogen gas reacts with oxygen gas to produce water
4.
Calcium reacts with chlorine gas to produce calcium chloride
5.
Sodium hydroxide reacts with hydrogen chloride to produce sodium chloride and water
HW: Balancing Equations 2
Name:
Balance the equations below:
H3PO4 + KOH  K3PO4 + H2O
HCl + NaOH  NaCl + H2O
C + S8  CS2
K + B2O3  K2O + B
Na + O2  Na2O2
H2 + O2  H2O2
Cs + N2  Cs3N
C6H6 + O2  CO2 + H2O
Al + S8  Al2S3
1.
Write the seven diatomic elements:
____________________________________________________________________________
Translate the sentences below to a chemical equation, and then balance the equation. Don’t forget the diatomic
elements!
2. Carbon reacts with oxygen to produce carbon dioxide
3. Chlorine gas reacts with potassium iodide to produce iodine and potassium chloride
4.
Lithium chloride reacts with silver nitrate to produce silver chloride and lithium nitrate
5.
Nitrogen reacts with oxygen to produce dinitrogen pentoxide.
6.
Aluminum oxide decomposes to produce aluminum metal and oxygen gas
7.
Magnesium reacts with water to produce magnesium hydroxide and hydrogen gas