Week 1.docx - 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.- 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.- 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) 3. Express the answers to the following calculations in scientific notation: (12 points) a. 145.75 + (2.3 × 10 –1 )= 145.75+(.23)= 1.4598x10^2 b. 79,500 ÷ (2.5 × 10 2 )= 79500/(250) = 3.18x10^2 c. (7.0 × 10 –3 ) – (8.0 × 10 –4 )= (7.0x10^-3)-(.8x10^-3) 6.2x10^-3 d. (1.0 × 10 4 ) × (9.9 × 10 6 ) (1.0x9.9)*(10^4+6) 9.9*10^10 (Reference: Chang 1.31)
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  • Spring '15
  • Khurana
  • Chemical substance, Chemical compound

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