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 + 3O2 → 2Al2O3
C3H8 + ___O2 → ___CO2 + ____ H2O
ANSWER
C3H8 + 5O2 → 3CO2 + 4H2O
Al(NO3)3 + ____ NaOH → Al(OH)3 + ____NaNO3
ANSWER
Al(NO303 + 3NaOH → Al(OH)3 + 3NaNO3
___KNO3 → ____KNO2 + O2
ANSWER
2KNO3 → 2KNO2 + O2
___O2 + CS2 → CO2 + _____SO2 ANSWER
3O2 + CS2 → CO2 + 2SO2
___KClO3 → _____KCl + ____O2 ANSWER
2KClO3 → 2KCl + 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 + H2SO4 → 2HBr + 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 + P4O10 → 4Na3PO4