FORM A

Name: ______Period:______Date:______

Chemistry I- M. Mack

Exam One: 1.1-1.4; 2.1-2.2a

Instructions: You may write your answers on this test only. A scratch sheet of paper has been provided for your use. Only the official scratch paper may be used during this exam, and it will not be graded. You have 40 minutes to complete the exam. Talking, eating, or misconduct of any form will result in an automatic void of the exam.

A. Define each term:

  1. CHEMISTRY

______

  1. MATTER

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  1. MASS

______

B. Indicate whether each statement is true or false.

______4. The mass of an object can vary with the object’s location.

______5. The layer closest to earth is the ozone layer and it provides the air we breathe, weather and clouds that we observe in the sky.

______6. Technology involves both pure and applied research.

______7. All chlorofluorocarbons (CFCs) are made in the laboratory.

______8. Submicroscopic matter can be viewed using a microscope.

C. Write the letter of the answer choice that best completes the statement.

______9. Qualitative observations:

  1. describe color, odor, shape, or some other physical characteristics
  2. Describe the amount- how much, how little, how big, etc.
  3. are a tentative explanation for what has been observed
  4. cannot be presented in words

______10. An experiment:

  1. must always follow the rigid steps of scientific method
  2. should not be repeated
  3. is a set of controlled conditions to test the hypothesis
  4. two of the above choices are correct

______11. An explanation that has been supported by many experiments, stating a

broad principle in nature and subject to new experimental data is:

  1. a theory
  2. a law
  3. the scientific method
  4. none of the above

D. Answer each of the following in complete sentences:

12. What is a scientific law? Give an example to support your explanation.

______

13. What is a model? When is it used?

______

E. Complete the following table:

SI Base Units

Quantity / Base Unit / Unit Abbreviation
14. / s
15. length / m
16. mass
17. / Kelvin
18. / mol

F. Problem Solving

19. You are given a 10-mL graduated cylinder filled with 2.5mL of water. You place a 28.95-g piece of gold into the cylinder and the water level rises to 4.0mL. What is the density ofgold? You know that silver has a density of 10.5 g/cm3. What mass of silver will raise the level of the water in the graduated cylinder by the same volume?

20. Saturn is approximately 1 429 000 km from the Sun. What is Saturn’s distance from the Sun in scientific notation?

21. Convert the following data to scientific notation:

  1. 166 000 000 000 000 m2
  1. 8943 kg
  1. .00158 liters

22. Bromine melts at -7.2 deg C. What is bromine’s melting point in kelvins?

23. Solve the following problems. Express your answers in scientific notation. SHOW ALL WORK.

  1. 3.7 x 10-6 – 8.0 x 105=
  1. 5.3 x 1012 + 3.0b x 1011=

24. Circle the terms that are in scientific notation.

.000536

1.26 x 10352.55 x 102

25. Explain in terms of density why a grocery bag containing all canned goods is harder to lift than a grocery bag containing all paper goods.

This is the end of exam one. If you finish before time is called, please go back and review your work. Sit quietly until further instructions are given.

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