Quest #2 Study Guide for Labs 1, 2, 3, 4 and Excursion w/ANSWERS
1. What do we mean by operational definition? (define the term) An operational definition is the
test you doe/perform/operate to know/define what you have.
2. Write an operational definition for carbon dioxide (CO2). I know I have CO2 when limewater
turns cloudy, phenol red turns yellow, and a lit match goes out.
3. Write an operational definition for hydrogen (H). I know I have H when a lit match pops.
4. Write a sentence for the production of hydrogen gas (from Lab 4). Zinc plus HCl yields or
produces H gas. No short cuts here. Write the words in English.
5. Calcium Carbonate + HCl  Carbon dioxide + Calcium Chloride
a. Which are the reactants? Calcium Carbonate + HCl
b. Which are the products? Carbon dioxide + Calcium Chloride
6. What does this symbol () mean? Yields or produces
7. Oxygen is a colorless gas. To test for it, a glowing splint is placed in a container of gas. If the gas is
oxygen, the glowing splint will burst into flames. Using this information, write an operational
definition for oxygen (O2). I know I have O2 when a glowing splint burst into flames.
8. Do you think there are more, less or the same numbers of matter particles as there are forms of
matter? Explain your answer and give a reason. Fewer particles that are shared among many
forms of matter. Analogy: like an alphabet to the dictionary full of words, the periodic table
is nature’s alphabet, where 118 elements combine in different ways to form the millions of
things that are matter in our universe.
9. What test would you use to find out if hydrogen (H) gas is present in a small container? (You could
also use this test to prove that zinc particles are different from chalk particles) A lit match
10. What test would you use to find out if carbon dioxide (CO2) gas is present in a small container? Lit
match, limewater and/or phenol red
11. Write a sentence for the reaction between HCl and chalk. HCl plus chalk yields/produces
carbon dioxide gas.
12. Name three (3) reactants that when added to HCl will produce carbon dioxide (CO2) gas. Shells,
chalk and baking soda.
13. Name the product in the zinc and HCl reaction. Hydrogen gas
14. What do chalk, baking soda and shells have in common? Explain. Bubble/fizz producing CO2
15. By what method did you collect the samples of gas from HCl and shells experiment?
Displacement
16. How can you prove that zinc particles are different from chalk particles? Lit match test has
different outcomes
17. What safety precautions should you follow when doing the test for the gas from the zinc and HCl
reaction? Hold and strike the lit match away from you
18. List the 5 signs of a chemical reaction and cite (give) an example of each from any of the labs.
1.
2.
3.
4.
5.
Formation of Bubbles (bubbling or fizzing indicates formation of a gas)
Formation of a solid (precipitate)
Change in temperature
Change in color
Production of an odor (formation of a gas)
Examples of each:
1.
2.
3.
4.
5.