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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 1
1.
A combination of chemical symbols and numbers that represents a single unit of a substance is called a chemical formula.
True
False
Question 2
2.
A
subscript
, is a number next to the symbol, it shows how many groups of atoms of that element there are.
True
False
Question 3
3.
The chemical formula for water is H2O (picture above).
Explain
how the chemical formula describes this model of a water molecule.
Question 4
4.
Choose the correct chemical formula below to match it with picture model.
NH3
CO2
O2
Question 5
5.
Choose the correct chemical formula below to match it with picture model.
CO2
H2O
O2
Question 6
6.
Choose the correct chemical formula below to match it with picture model.
H2O
CO2
NH3
Question 7
7.
How many atoms are in the compound described by this chemical formula?
(CH3)2N
5
9
3
Question 8
8.
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
Question 9
9.
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
Question 10
10.
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
Question 11
11.
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
Question 12
12.
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
Question 13
13.
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
Question 14
14.
Explain how this chemical equation
H2 + Cl2 → 2HCl
shows The Law of Conservation of Matter
