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# Chem bell ringers week 1

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Grimsley High School Honors Chem Bell ringer slides

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### Chem bell ringers week 1

1. 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. 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. 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. 4. Honor Chem. Bell Ringer 3Responses: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. 5. Earth Science Bell ringer 4Remember 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. 6. Earth Science Bell ringer 4Responses  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. 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. 8. Honor Chem. Bell Ringer 4Response 33000 mm2Or 3.3 x 104 mm2