CHEM-121_Written Assignment 1 - Thomas Edison State College General Chemistry I with Labs(CHE-121 Section no OL009 Semester and year Feb/2015 Written

CHEM-121_Written Assignment 1 - Thomas Edison State College...

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Thomas Edison State College General Chemistry I with Labs (CHE-121) Section no.: OL009 Semester and year: Feb. /2015 Written Assignment 1: Introduction and Measurement Answer all assigned questions and problems, and show all work. 1.Do the following statements describe chemical or physical properties? (10 points) a. Oxygen gas supports combustion. Chemical property b. Fertilizers help to increase agricultural production. Chemical property c. Water boils below 100°C on top of a mountain. Physical property d. Lead is denser than aluminum. Physical property e. Uranium is a radioactive element. Chemical property (Reference: Chang 1.11) 2. Classify each of the following as an element, a compound, a homogeneous mixture, or a heterogeneous mixture: (7 points) a. water from a well: A homogeneous mixture b. argon gas: An element c. sucrose: A compound d. air: A homogeneous mixture e. dirt: A heterogeneous mixture f. a rusty iron nail: A heterogeneous mixture g. ozone: A compound 3. Express the answers to the following calculations in scientific notation: (12 points) a. 145.75 + (2.3 × 10 –1 ) = 145.98 = 1.4598 x 10² b. 79,500 ÷ (2.5 × 10
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  • Spring '15
  • Khurana
  • Chemistry, Chemical substance, Chemical compound, Thomas Edison State College

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