Practice questionsCHM 111(ch 1&2).docx

Practice questionsCHM 111(ch 1&2).docx - Chapter 1 Be...

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Chapter 1 Be sure to know and can explain the Key Terms at the end of Chapter 1 and Chapter 2. I- What are some properties of a law, hypothesis and theory? 1 .A consistent explanation of known observations is called A) an experiment. B) a hypothesis. C) a prediction. D) a theory. II- How are the molecules of solids, liquids, and gaseous substances different in their arrangement? 1 - Give three examples of substances that form amorphous solids, and three examples for crystalline solids. 2 - What kind of properties a crystalline solid has? How are they different from an amorphous solid? III- Know the definitions and supporting evidence so that you can Identify substances as pure substance (can be either an element or a compound) and, mixtures (homogeneous, heterogeneous); Know that elements are the basic building blocks of matter. 1 - Choose the homogeneous mixture(s) from the list below. A) Kool-aid B) Mud C) Ice water D) Salad dressing E) Salsa F) New copper penny G) The Mountain air 2-. A substance that can't be chemically broken down into simpler substances is considered to be…………….. 3-. Two or more substances in variable proportions, where the composition is constant throughout are considered……………. 4 -. Two or more substances in variable proportions, where the composition is variable throughout are considered…………………….. IV- Identify properties as Physical (can be measured AND do not change as a result of the measurement) or Chemical; V- Identify processes as physical or chemical change; chemical changes produce new substances with different physical and chemical changes. 1
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