Balancing Chemical Equations - Sofia Exam
Questions and Correct Answers
1. What are the new substances that are created following a chemical
reaction?-
correct answer: Products
2. What are the elements or compounds which are present prior to a
chemical reaction? correct answer: Reactants
3. What does the arrow in a chemical equation represent? correct
answer: Chemical reaction
4. What is the large number before a molecule called? correct answer:
coeflcient
5. What does the subscript represent in a chemical equation? correct
answer: Number of atoms in a molecule
6. How many molecules of CO(2) are present? 6CO(2) + 6H(2)O —>
C(6)H(12)O(6)
+ 6O(2) correct answer: 6 CO(2)
7. What is a coefficient? correct answer: It is the larger
number in a chemical equation. It represents the number of
molecules
8. How many atoms of oxygen are present in the reactants?6CO(2) +
6H(2)O —> C(6)H(12)O(6) + 6O(2) correct answer: 18 (12+6)
9. How many atoms of carbon are present in the products? correct
answer: 6 carbons
10. How many total atoms are present in C(6)H(12)O(6) ? correct
answer: 24 (6+12+6)
11. Is it balanced or unbalanced? correct answer: Unbalanced
12. How is an equation balanced? correct answer: If the reactants side adds up to
the same amount of molecules as the products side, it is balanced.
13. What are the small numbers after a molecule? correct answer:
Subscripts
14. How do you know if an equation is unbalanced. correct answer: If the
product side doesn't have the same amount of molecules as the reactant side.
15. N(2)+H(3)->N(2)H(3) (Balanced or unbalanced) correct answer:
1/
1
Questions and Correct Answers
1. What are the new substances that are created following a chemical
reaction?-
correct answer: Products
2. What are the elements or compounds which are present prior to a
chemical reaction? correct answer: Reactants
3. What does the arrow in a chemical equation represent? correct
answer: Chemical reaction
4. What is the large number before a molecule called? correct answer:
coeflcient
5. What does the subscript represent in a chemical equation? correct
answer: Number of atoms in a molecule
6. How many molecules of CO(2) are present? 6CO(2) + 6H(2)O —>
C(6)H(12)O(6)
+ 6O(2) correct answer: 6 CO(2)
7. What is a coefficient? correct answer: It is the larger
number in a chemical equation. It represents the number of
molecules
8. How many atoms of oxygen are present in the reactants?6CO(2) +
6H(2)O —> C(6)H(12)O(6) + 6O(2) correct answer: 18 (12+6)
9. How many atoms of carbon are present in the products? correct
answer: 6 carbons
10. How many total atoms are present in C(6)H(12)O(6) ? correct
answer: 24 (6+12+6)
11. Is it balanced or unbalanced? correct answer: Unbalanced
12. How is an equation balanced? correct answer: If the reactants side adds up to
the same amount of molecules as the products side, it is balanced.
13. What are the small numbers after a molecule? correct answer:
Subscripts
14. How do you know if an equation is unbalanced. correct answer: If the
product side doesn't have the same amount of molecules as the reactant side.
15. N(2)+H(3)->N(2)H(3) (Balanced or unbalanced) correct answer:
1/
1
