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Chemical Equations
By GUILLERMO LOBATOS
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Last updated over 5 years ago
14 questions
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Question 3
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The chemical formula for water is H2O (picture above).
Explain
how the chemical formula describes this model of a water molecule.
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Explain how this chemical equation
H2 + Cl2 → 2HCl
shows The Law of Conservation of Matter
A combination of chemical symbols and numbers that represents a single unit of a substance is called a chemical formula.
True
False
A
subscript
, is a number next to the symbol, it shows how many groups of atoms of that element there are.
True
False
Choose the correct chemical formula below to match it with picture model.
NH3
CO2
O2
Choose the correct chemical formula below to match it with picture model.
CO2
H2O
O2
Choose the correct chemical formula below to match it with picture model.
H2O
CO2
NH3
How many atoms are in the compound described by this chemical formula?
(CH3)2N
5
9
3
A
coefficient
is a number placed in front of a chemical formula to show how many molecules of the substance are represented in the chemical equation.
True
False
Match the description of a chemical reaction with the equation that models it.
Zinc (Zn) and hydrochloric acid (HCl) react and form zinc chloride and hydrogen gas.
Zn + 2HCl → ZnCl2 + H2
H2CO3 → H2O + CO2
4Fe + 3O2 → 2Fe2O3
SO3 + H2O → H2SO4
Match the description of a chemical reaction with the equation that models it.
Carbonic acid breaks down and forms water (H2O) and carbon dioxide (CO2).
Zn + 2HCl → ZnCl2 + H2
H2CO3 → H2O + CO2
4Fe + 3O2 → 2Fe2O3
SO3 + H2O → H2SO4
Match the description of a chemical reaction with the equation that models it.
Sulfur trioxide reacts with water vapor and forms sulfuric acid (H2SO4).
Zn + 2HCl → ZnCl2 + H2
H2CO3 → H2O + CO2
4Fe + 3O2 → 2Fe2O3
SO3 + H2O → H2SO4
Match the description of a chemical reaction with the equation that models it.
Iron (Fe) and oxygen gas react and form iron oxide (rust).
Zn + 2HCl → ZnCl2 + H2
4Fe + 3O2 → 2Fe2O3
4Fe + 3O2 → 2Fe2O3
SO3 + H2O → H2SO4
For each chemical equation, compare the number of atoms on each element on both sides of the equation. Select the equations that are balanced.
C2H6 + 5O2 → 2CO2 + 3H2O
3CO + Fe2O3 → 2Fe + 3CO2
H2SO4 + 2NaOH → Na2SO4 + 2H2O
2AgNO3 + CaCl2 → 2AgCl + Ca(NO3)2
