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WorksheetsChemical Equation Balancing Quiz
Total questions: 35
Worksheet time: 18mins
1. For the chemical equation N₂ + 3H₂ → 2NH₃, indicate whether it is Balanced (B) or Unbalanced (U).
Balanced (B)
Unbalanced (U)
2. For the chemical equation C₃H₈ + 5O₂ → 3CO₂ + 4H₂O,
indicate whether it is Balanced (B) or Unbalanced (U).
Balanced (B)
Unbalanced (U)
3. For the chemical equation H₂ + Cl₂ → HCl,
indicate whether it is Balanced (B) or Unbalanced (U).
Balanced (B)
Unbalanced (U)
4. For the chemical equation Fe₂O₃ + 3CO → 2Fe + 3CO₂,
indicate whether it is Balanced (B) or Unbalanced (U).
Balanced (B)
Unbalanced (U)
5. For the chemical equation AgNO₃ + NaCl → AgCl + NaNO₃,
indicate whether it is Balanced (B) or Unbalanced (U).
Balanced (B)
Unbalanced (U)
6. CH₄ + 2O₂ → CO₂ + 2H₂O, indicate whether it is Balanced (B) or Unbalanced (U).
Balanced (B)
Unbalanced (U)
7. chemical equation CaCO₃ → CaO + CO₂, indicate whether it is Balanced (B) or Unbalanced (U).
Balanced (B)
Unbalanced (U)
8. the chemical equation 2H₂O → 2H₂ + O₂, indicate whether it is Balanced (B) or Unbalanced (U).
Balanced (B)
Unbalanced (U)
9. the chemical equation Zn + 2HCl → ZnCl₂ + H₂, indicate whether it is Balanced (B) or Unbalanced (U).
Balanced (B)
Unbalanced (U)
10. For the chemical equation Al₂O₃ → Al + O₂, indicate whether it is Balanced (B) or Unbalanced (U).
Balanced (B)
Unbalanced (U)
11.For the chemical equation KClO₃ → KCl + O₂, indicate whether it is Balanced (B) or Unbalanced (U).
Balanced (B)
Unbalanced (U)
12. Na₂SO₄ + BaCl₂ → 2NaCl + BaSO₄, indicate whether it is Balanced (B) or Unbalanced (U).
Balanced (B)
Unbalanced (U)
13.For the chemical equation SO₂ + O₂ → SO₃, indicate whether it is Balanced (B) or Unbalanced (U).
Balanced (B)
Unbalanced (U)
14.For the chemical equation 2Na + Cl₂ → 2NaCl, indicate whether it is Balanced (B) or Unbalanced (U).
Balanced (B)
Unbalanced (U)
15. H₂SO₄ + NaOH → Na₂SO₄ + H₂O, indicate whether it is Balanced (B) or Unbalanced (U).
Balanced (B)
Unbalanced (U)
16. chemical equation H₂ + O₂ → H₂O, indicate whether it is Balanced (B) or Unbalanced (U).
Balanced (B)
Unbalanced (U)
17. chemical equation 2HgO → 2Hg + O₂, indicate whether it is Balanced (B) or Unbalanced (U).
Balanced (B)
Unbalanced (U)
18. chemical equation C₂H₄ + O₂ → CO₂ + H₂O, indicate whether it is Balanced (B) or Unbalanced (U).
Balanced (B)
Unbalanced (U)
19. chemical equation PbO₂ + H₂ → Pb + H₂O, indicate whether it is Balanced (B) or Unbalanced (U).
Balanced (B)
Unbalanced (U)
20. chemical equation NH₃ + HCl → NH₄Cl, indicate whether it is Balanced (B) or Unbalanced (U).
Balanced (B)
Unbalanced (U)
3 H2SO4
There are (a) hydrogens, (b) sulfurs, and (c) oxygens
4CF2Cl3
carbon
4
fluorine
8
chlorine
12
2 CH2CO3OH
Number of C: (a)
Number of H: (b)
Number of O: (c)
In 3P2O5, there are (a) phosphorus (P) atoms and (b) oxygen (O) atoms.
Balance this equation:
(a) Fe + (b) O2 --> (c) Fe2O3
What is the definition of a chemical reaction according to the text?
A process in which new substances are formed
A process that only changes the appearance of substances
A process that involves no change in the properties of matter
A process that creates matter from energy
Which statement best describes the Law of Conservation of Matter?
Atoms can be created or destroyed in a chemical reaction.
The number of atoms before and after a chemical reaction remains the same.
New substances are always formed in physical changes.
Matter can change its mass during a chemical reaction.
What happens to the properties of substances after a chemical reaction?
They remain the same.
They become unobservable.
They change to form new substances with different properties.
They are destroyed completely.
Which of the following is an example of a physical change mentioned in the text?
Burning wood
Melting ice
Mixing vinegar and baking soda
Rusting iron
What misconception do many students have about dissolving, according to the text?
It is a physical change.
It is a chemical reaction.
It does not involve any energy.
It creates a new substance.
What are reactants in a chemical reaction?
The products formed after the reaction
The substances that combine or rearrange to form products
The energy required for the reaction to occur
The catalysts that speed up the reaction
Which professions are mentioned as using chemical reactions to solve problems?
A) Engineers and architects
B) Chemical engineers and material scientists
C) Computer scientists and mathematicians
D) Teachers and educators
What role do the properties of substances play in chemical reactions?
A) They determine the temperature of the reaction.
B) They dictate how substances interact with each other.
C) They are irrelevant to the outcome of the reaction.
D) They change during the reaction.
According to the text, what is one of the applications of studying chemical reactions?
A) To create new forms of energy
B) To advance space exploration and develop medicines
C) To improve physical fitness
D) To enhance computer technology
What is the role of a catalyst in a chemical reaction?
To increase the temperature of the reaction
To decrease the energy required for the reaction
To be consumed in the reaction
To change the products of the reaction
