Gizmos: Balancing Chemical Equations Exam
Questions and Correct Answers
1. Coefficient correct answer: a number that indicates how many of each atom or molecule there
are
2. that there are six Oxygen atoms correct answer: What does the coeflcient "6"
in 6O mean?
3. Combustion correct answer: a chemical reaction in which a fuel burns in a gas, usually
oxygen
4. carbon-based fuel. Like methane burning in oxygen gas to
produce carbon dioxide and water correct answer: What type of fuel is involved in
most combustion reactions?
5. Compound correct answer: A pure substance made of two or more elements chemically
combined
6. by a chemical formula correct answer: How can a compound be described?
7. Decomposition correct answer: a chemical reaction in which a single substance is broken
down into two or more products.
8. sodium and chloride correct answer: What is salt decomposed into?
9. double replacement correct answer: a reaction in which two compounds exchange
elements or molecules with one another.
10. salt and hydrogen sulfide correct answer: What does sodium sulfide and
hydrochloric react to form?
11. element correct answer: A pure substance made of only one kind of atom
12. Molecule correct answer: a stable particle made of two or more atoms.
13. two hydrogen atoms and one oxygen atom correct answer: What is a
water molecule made of?
14. product correct answer: A substance produced in a chemical reaction
15. reactant correct answer: a substance that takes part in a chemical reaction.
16. Single Replacement correct answer: a reaction in which an element reacts with a
compound to form a new compound and a ditterent element.
17. aluminum chloride and hydrogen gas correct answer: Aluminum can react
with hydrochloric acid to form...
18. Subscript correct answer: A number in a chemical formula that tells the number of atoms
in a molecule
19. synthesis correct answer: a chemical reaction in which two or more reactants form a
single product.
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Questions and Correct Answers
1. Coefficient correct answer: a number that indicates how many of each atom or molecule there
are
2. that there are six Oxygen atoms correct answer: What does the coeflcient "6"
in 6O mean?
3. Combustion correct answer: a chemical reaction in which a fuel burns in a gas, usually
oxygen
4. carbon-based fuel. Like methane burning in oxygen gas to
produce carbon dioxide and water correct answer: What type of fuel is involved in
most combustion reactions?
5. Compound correct answer: A pure substance made of two or more elements chemically
combined
6. by a chemical formula correct answer: How can a compound be described?
7. Decomposition correct answer: a chemical reaction in which a single substance is broken
down into two or more products.
8. sodium and chloride correct answer: What is salt decomposed into?
9. double replacement correct answer: a reaction in which two compounds exchange
elements or molecules with one another.
10. salt and hydrogen sulfide correct answer: What does sodium sulfide and
hydrochloric react to form?
11. element correct answer: A pure substance made of only one kind of atom
12. Molecule correct answer: a stable particle made of two or more atoms.
13. two hydrogen atoms and one oxygen atom correct answer: What is a
water molecule made of?
14. product correct answer: A substance produced in a chemical reaction
15. reactant correct answer: a substance that takes part in a chemical reaction.
16. Single Replacement correct answer: a reaction in which an element reacts with a
compound to form a new compound and a ditterent element.
17. aluminum chloride and hydrogen gas correct answer: Aluminum can react
with hydrochloric acid to form...
18. Subscript correct answer: A number in a chemical formula that tells the number of atoms
in a molecule
19. synthesis correct answer: a chemical reaction in which two or more reactants form a
single product.
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