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HW1_explained - padilla(tp5647 HW01 Fundamentals Revision I...

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padilla (tp5647) – HW01: Fundamentals Revision I – shear – (52375) 1 This print-out should have 20 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. These questions test basic knowledge that you need for this course. You are welcome to consult your textbook for information to help do this homework, just be aware of how much help you needed. Some questions *WILL* need you to look things up like atomic masses, fundamental constants and unit conversions. 001 10.0 points Which diagram(s) I II III IV best characterize(s) a mixture? 1. I and III only 2. III and IV only correct 3. I, II and III only 4. IV only Explanation: The dark and light spheres represent atoms of different elements. A mixture consists of different substances combined together phys- ically. Although some atoms are chemically bonded in the figures, the samples do not con- sist of all of the same type of bonded atoms. 002 10.0 points A pure substance composed of two or more elements chemically combined is 1. a solution. 2. an atom. 3. a mixture. 4. a compound. correct Explanation: A compound is a substance composed of two or more elements chemically combined. 003 10.0 points A pure substance made up of the same kind of atoms is called 1. a chemical bond. 2. a compound. 3. an element. correct 4. None of these 5. a pure mixture. Explanation: An element is a substance that cannot be decomposed into simpler substances by chem- ical means. It is made of the same kind of atoms. 004 10.0 points Which of water, iron, ammonia, chromium, radon, and silicon are chemical compounds as opposed to elements? 1. chromium and water 2. only water 3. radon and ammonia 4. iron and silicon 5. water and ammonia correct Explanation: Water (H 2 O) and ammonia (NH 3 ) are com-
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padilla (tp5647) – HW01: Fundamentals Revision I – shear – (52375) 2 posed of more than one element and are com- pounds.
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