WA01_CHE-121-mar14 - Thomas Edison State College General...

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Thomas Edison State College General Chemistry I with Labs (CHE-121) Section no.: OL009 Semester and year: May 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 b. Fertilizers help to increase agricultural production. chemical c. Water boils below 100°C on top of a mountain. physical d. Lead is denser than aluminum. physical e. Uranium is a radioactive element. physical (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 compound b. argon gas element c. sucrose homogeneous d. air compound e. dirt heterogeneous f. a rusty iron nail heterogeneous g. ozone heterogeneous 3. Express the answers to the following calculations in scientific notation: (12 points) a. 145.75 + (2.3 × 10 –1 ) = 145.75 + 0.23 = 145.98 b. 79,500 ÷ (2.5 × 10 2 ) = 79,500 ÷ 250 = 318 c. (7.0 × 10 –3 ) – (8.0 × 10 –4 ) = (7.0 – 8.0) x (10
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  • Spring '15
  • Khurana
  • Chemistry, Chemical compound, Thomas Edison State College, Edison State College

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