The document contains several chemistry bell ringers providing short questions to answer in complete sentences. The questions cover topics like the study of chemistry, population percentages in the US, conversion factors from equivalence relationships, rounding numbers to significant figures and writing them in scientific notation, variables in experiments, and calculating the area of a rectangular piece of paper from measurements with significant figures.

1. Honor Chem. Bell Ringer 1
 Answer using a complete sentence:
 Chemistry involves the study of…
 A. Human behavior
 B. Atoms and molecules
 What percent of the world’s population live
in the United States?
 A. 6%
 B. 12%
 C. 18%
 D. 24%

2. Honor Chem. Bell Ringer 2
 Answer using a complete sentence:
 How many conversion factors can be
made from an equivalence relationship?
 Where should the initial or known quantity
appear in a factor-label diagram?

3. Honor Chem. Bell Ringer 3
 Round each of these numbers to 3 Sig Figs and
write them in scientific notation:
1) 1,566,311
2) 2.7651 X 10-3
3) 84,549
4) 0.0011672
5) 0.07799

4. Honor Chem. Bell Ringer 3
Responses:
3 Sig Figs in scientific notation:
1) 1.57 X 106
2) 2.76 X 10-3 or 2.77 X 10-3
3) 8.45 X 104
4) 1.17 X 10-3
5) 7.80 X 10-2

5. Earth Science Bell ringer 4
Remember to answer in complete sentences!
 Whatvariables can be found in the Purpose
or Question of an experiment and the
Hypothesis?
 Why are Control Variables important in an
experiment?

6. Earth Science Bell ringer 4
Responses
 Theindependent and dependent variables
can be found in the question and
hypothesis of an experiment
 Control variables are important because
they make an experiment “fair”.

7. Honor Chem. Bell Ringer 4
 The area of a rectangular piece of paper is to be
calculated from measurements made in a lab. The
width of the paper measured by Alice is 117 mm.
The length of the paper is measured by Boris as
280 mm. What is the area of the paper?
(Remember sig figs, you can write your answer
in scientific notation.)

8. Honor Chem. Bell Ringer 4
Response
 33000 mm2
Or
 3.3 x 104 mm2