Writing Chemical Equations
What does the arrow → mean in a chemical reaction?
Yields; produces
2Na + Cl2 → 2NaCl is an example of which type of reaction?
Synthesis
Balance:
H2O → H2 + O2
2H2O → 2H2 + O2
Complete and balance this synthesis reaction:
K + Cl2 →
2K + Cl2 → 2KCl
What sport is Ms. DeCotis coaching this spring?
Softball
Identify the reactants in the following reaction:
2AlBr3 + 3MgCl3 → 2AlCl3 + 3MgBr2
AlBr3 and MgCl2
The general equation A + BC → B + AC represents which type of equation?
Single Replacement
Balance:
Pb(OH)2 + HCl → H2O + PbCl2
Pb(OH)2 + 2HCl → 2H2O + PbCl2
Complete and balance this decomposition reaction:
AgBr →
2AgBr → 2Ag + Br2
What is Ms. DeCotis' eye color?
Blue
Write how gaseous nitrogen trihydride would look in a chemical equation.
NH3 (g)
AgNO3 + NaCl → AgCl + NaNO3 is an example of which type of reaction?
Double
Balance:
P + O2 → P2O5
4P + 5O2 → 2P2O5
Complete and balance the following single reaction:
LiI + Cl2 →
2LiI + Cl2 → 2LiCl + I2
London!
Write the chemical equation for the following reaction (you do not need to balance):
Iron (III) chloride reacts with magnesium hydroxide to produce iron (III) hydroxide and magnesium chloride.
FeCl3 + Mg(OH)2 → Fe(OH)3 + MgCl2
The process of digestion (the breakdown of the food you eat) is most likely which type of reaction?
Decomposition
Balance:
C3H8 + O2 → CO2 + H2O
C3H8 + 5O2 → 3CO2 + 4H2O
Complete and balance the following combustion reaction:
CH4 + O2 →
CH4 + 2O2 → CO2 + 2H2O
How many people were in Ms. DeCotis' graduating class from CCA? (closest guess gets the points)
21
Write the chemical equation for the following reaction (you do not need to balance the equation):
Solid sodium reacts with liquid water to produce aqueous sodium hydroxide and hydrogen gas
Na(s) + H2O(l) → NaOH(aq) + H2(g)
This type of reaction can result in the formation of a precipitate.
Double - in a neutralization reaction, we form a salt (solid aka precipitate) and water
Balance:
Na2O + CO2 + H2O → NaHCO3
Na2O + 2CO2 + H2O → 2NaHCO3
Complete and balance this double replacement reaction:
Al(OH)3 + Mg3(PO4)2 →
2Al(OH)3 + Mg3(PO4)2 → 2AlPO4 + 3Mg(OH)2
When is Ms. DeCotis' birthday?
April 10 (Today!)