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Chem 111 Exam: Questions on Atomic Structure, Molecules, Compounds, and Chemical Reactions, Exams of Chemistry

A chemistry exam consisting of 12 questions. The questions cover various topics including atomic structure, molecules and compounds, physical and chemical changes, and chemical formulas. Students are required to complete tables, describe concepts, classify substances, and perform calculations.

Typology: Exams

2010/2011

Uploaded on 10/17/2011

kelseybradley1
kelseybradley1 🇺🇸

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Chem 111 Exam IB S07 Dr. Macintosh Name (please print):
SHOW ALL WORK INCLUDING UNIT CANCELLATIONS. USE PROPER NUMBER OF
SIG FIGS. READ THE QUESTIONS CAREFULLY AND ANSWER THEM COMPLETELY.
1) (10) Complete the following table:
symbol name protons neutrons electrons
35Cl
11 12 10
Strontium-90
2) (6) Describe how the terms molecule and compound are different.
3) (6) Classy each of the following as a physical or chemical change?
(a) A piece of aluminum metal develops a white coating over time. _____________
(b) Sodium chloride is electrolyzed to produce sodium metal and chlorine gas. __________
(c) A purple vapor appears in a vial containing iodine. ___________
4) (6) Fill in the (an) element symbol that corresponds to each of the following:
(a) 4th period halogen __________
(b) 3rd period alkaline earth ____________
(c) a nonmetal in the 3rd period ______________
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Chem 111 Exam IB S07 Dr. Macintosh Name (please print): SHOW ALL WORK INCLUDING UNIT CANCELLATIONS. USE PROPER NUMBER OF SIG FIGS. READ THE QUESTIONS CAREFULLY AND ANSWER THEM COMPLETELY.

  1. (10) Complete the following table:

symbol name protons neutrons electrons (^35) Cl

Strontium-

  1. (6) Describe how the terms molecule and compound are different.

  2. (6) Classy each of the following as a physical or chemical change? (a) A piece of aluminum metal develops a white coating over time. _____________

(b) Sodium chloride is electrolyzed to produce sodium metal and chlorine gas. __________

(c) A purple vapor appears in a vial containing iodine. ___________

  1. (6) Fill in the (an) element symbol that corresponds to each of the following:

(a) 4th^ period halogen __________

(b) 3rd^ period alkaline earth ____________

(c) a nonmetal in the 3 rd^ period ______________

  1. (6) Write accurate chemical formulas for each of the following compounds

(a) ammonium nitrate

(b) manganese(II) chloride

(c) potassium sulfide

  1. (12) Classify each of the following using the standard chemical classification of heterogeneous or homogeneous mixture, element or compound. You must describe the object as well as explaining how this and other specific facts you know lead to your classification. A correct classification is worth 1 pt. and its explanation is worth 3 pt.

(a) seawater

(b) soil

(c) a glass of ice tea with ice cubes

  1. (12) A small hole in the wing of a space shuttle requires a 17.7 cm^2 patch. What is the patch’s area in km^2?

  2. (10) The speed of light in a vacuum is 2.998 × 10^8 m/s. What is its speed in km/h?

  3. (6) Name the following compounds using the correct systematic method

(a) CuBr (^2)

(b) K 2 CO 3

(c) CaSO 4