U7.3 Study Guide (Balancing Chemical Equations)

Quiz by Aaron Holley

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Q 1/20
Score 0
While skeleton equations provide us with a lot of information about a chemical reaction, they are not perfect. What is a major limitation to skeleton equations?
29
They don't tell us how much of each substance is needed for the reaction, just what is present.
They indicate what conditions under which the reaction occurs (temperature, presence of a catalyst, etc.).
They tell us the physical state of each reactant and product in the reaction.
They tell us too much information about a reaction. We only need the minimum amount of information required to know what will happen.

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20 questions

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Q1
While skeleton equations provide us with a lot of information about a chemical reaction, they are not perfect. What is a major limitation to skeleton equations?
They don't tell us how much of each substance is needed for the reaction, just what is present.
They indicate what conditions under which the reaction occurs (temperature, presence of a catalyst, etc.).
They tell us the physical state of each reactant and product in the reaction.
They tell us too much information about a reaction. We only need the minimum amount of information required to know what will happen.
30s
Q2
The physical law that states matter cannot be created or destroyed in a chemical reaction is referred to as the ______.
law of conservation of energy
mandate of mass management
law of conservation of momentum
law of conservation of mass
30s
Q3
According to the law of conservation of mass, what two things are conserved during a chemical reaction?
mass and protons
density and atoms
mass and atoms
volume and atoms
30s
Q4
Who is credited with the discovery of the law of conservation of mass?
Ernest Rutherford
Antoine Lavoisier
JJ Thomson
John Dalton
30s
Q5
In order to balance chemical equations, we put ______ to the ______ of chemical formulas and symbols in a chemical equation.
coefficients, right
coefficients, left
fractions, left
decimals, right
30s
Q6
What must you never change when balancing chemical equations?
the coefficients
the subscripts for the chemical formulas
the order of the reactants
the charges of the ions
30s
Q7
How many sodium atoms are present in the following compound? Type your answer in the space below.
4 Na₃PO₄
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60s
Q8
How many phosphorus atoms are present in the following compound? Type your answer in the space below.
4 Na₃PO₄
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60s
Q9
How many oxygen atoms are present in the following compound? Type your answer in the space below.
4 Na₃PO₄
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60s
Q10
How many oxygen atoms are present in the following compound? Type your answer in the space below.
3 Be(ClO₄)₂
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60s
Q11
How many chlorine atoms are present in the following compound? Type your answer in the space below.
3 Be(ClO₄)₂
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60s
Q12
Which of the following chemical equations is unbalanced?
2 Al + 3 Cl₂ $\ \ \longrightarrow\ \$ 2 AlCl₃
H₂ + O₂ $\ \ \longrightarrow\ \$ 2 H₂O
N₂ + 3 H₂ $\ \ \longrightarrow\ \$ 2 NH₃
2 KClO₃ $\ \ \longrightarrow\ \$ 2 KCl + 3 O₂
120s
Q13
Which of the following chemical equations is unbalanced?
CH₄ + 2 O₂ $\ \ \longrightarrow\ \$ 2 H₂O + CO₂
2 Na + 2 H₂O $\ \ \longrightarrow\ \$ 2 NaOH + H₂
FeCl₃ + 3 NaOH $\ \ \longrightarrow\ \$ Fe(OH)₃ + 3 NaCl
NaBr + CaF₂ $\ \ \longrightarrow\ \$ 2 NaF + CaBr₂
120s
Q14
Which of the following chemical equations is unbalanced?
CH₄ + 4 Cl₂ $\ \ \longrightarrow\ \$ CCl₄ + 4 HCl
2 Al + 3 H₂SO₄ $\ \ \longrightarrow\ \$ 3 H₂ + Al₂(SO₄)₃
4 Fe + 3 O₂ $\ \ \longrightarrow\ \$ 2 Fe₂O₃
H₃PO₄ + 2 KOH $\ \ \longrightarrow\ \$ 3 K₃PO₄ + H₂O
120s
Q15
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300s

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U7.3 Study Guide (Balancing Chemical Equations)

Quiz by Aaron Holley

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