Written Assignment 1 Chem.rtf - Name Nate Stults College...

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Name: Nate Stults College ID:0641016 Thomas Edison State University General Chemistry I with Labs (CHE-121) Section no.: Semester and year: Feb 2019 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. 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 Mixture d. air- Homogeneous Mixture e. dirt- Heterogeneous Mixture f. a rusty iron nail – Heterogeneous Mixture g. ozone- Compound 3. Express the answers to the following calculations in scientific notation: (12 points) a. 145.75 + (2.3 × 10 –1 )

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