WA01_CHE-121-mar14 - Written Assignment 1 Introduction and...

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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. - Physical 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. - Chemical (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 - Compound d. air – Heterogeneous mixture e. dirt – Heterogeneous mixture f. a rusty iron nail - Compound g. ozone – Homogeneous mixture 3. Express the answers to the following calculations in scientific notation: (12 points) a. 145.75 + (2.3 × 10 –1 ) = 1.46 x 10 2 b. 79,500 ÷ (2.5 × 10 2 ) = 3.18 x 10 2 c. (7.0 × 10 –3 ) – (8.0 × 10 –4 ) = 6.2 x 10 -3 d. (1.0 × 10 4 ) × (9.9 × 10 6 ) = 9.9 x 10 6 *Note these answers account for significant digits as well.
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  • Spring '15
  • Khurana
  • Chemistry, pH, Chemical substance, Chemical compound, Thomas Edison State College, Edison State College

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