Use these questions to check your answers to the video quiz questions.

Who is credited with the first atomic theory that is based on experimental evidence?
Dalton
Democritus
Aristotle
Rutherford
In an ionic compound, the chemical formula represents: (there are multiple correct answers)
one formula unit of the compound
the simplest ratio of positive to negative ions in the compound
one molecule of the compound
The starting substances in a chemical reaction are called the:
reactants
products
yield
coefficients
An equation is said to be balanced if it follows the Law of Conservation of Mass.
True
False

When balancing a chemical equation, one is allowed to adjust the:
coefficients
formulas of the reactants
fomulas of the products

In a chemical equation, the arrow is read as yields.
True
False

Choose the coefficients which, in order, would correctly balance the following equation: HgO → Hg + O2

Answer:

2HgO → 2Hg + O2


Practice balancing equations.  Click on answer to reveal the correct balanced formula.

___Al + ___O 2 → _____ Al2O3
ANSWER

4Al + 3O22Al2O3


C3H8 + ___O2 → ___CO2 + ____ H2O
ANSWER

C3H8 + 5O23CO2 + 4H2O


Al(NO3)3 + ____ NaOH → Al(OH)3 + ____NaNO3
ANSWER

Al(NO303 + 3NaOH → Al(OH)3 + 3NaNO3


___KNO3 → ____KNO2 + O2
ANSWER

2KNO32KNO2 + O2


___O2 + CS2 → CO2 + _____SO2 ANSWER

3O2 + CS2 → CO2 + 2SO2


___KClO3 → _____KCl + ____O2 ANSWER

2KClO32KCl + 3O2


___BaF2 + ____K3PO4 → Ba3(PO4)2 + ____KF ANSWER

3BaF2 + 2K3PO4 → Ba3(PO4)2 + 6KF


H2SO4 + Mg(NO3)2 → MgSO4 + ______HNO3 ANSWER

H2SO4 + Mg(NO3)2 → MgSO4 + 2HNO3


___Al + ____H2SO4 → Al2(SO4)3 + ____H2 ANSWER

2Al + 3H2SO4 → Al2(SO4)3 + 3H2


WO3 + ____H2 → W + _____H2O ANSWER

WO3 + 3H2 → W + 3H2O


Fe + ____HCl → FeCl2 + H2 ANSWER

Fe + 2HCl → FeCl2 + H2


____Ca(OH)2 + ________H3PO4 → Ca3(PO4)2 + ___________H2O ANSWER

3Ca(OH)2 + 2H3PO4 → Ca3(PO4)2 + 6H2O


CaBr2 + H2SO4 → _____HBr + CaSO4 ANSWER

CaBr2 + H2SO42HBr + CaSO4


____NaHCO3 → Na2CO3 + H2O + CO2 ANSWER

2NaHCO3 → Na2CO3 + H2O + CO2


_____FeCl2 + ______Na3PO4 → Fe3(PO4)2 + ______NaCl ANSWER

3FeCl2 + 2Na3PO4 → Fe3(PO4)2 + 6NaCl


Sb2O3 + ____NaOH → ___NaSbO2 + H2O
ANSWER

Sb2O3 + 2NaOH → 2NaSbO2 + H2O


___Na2O + P4O10 → ___Na3PO4 ANSWER

6Na2O + P4O104Na3PO4

 

 


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