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H01- Fundamentals - saldana(avs387 H01 Fundamentals...

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saldana (avs387) – H01: Fundamentals – Mccord – (52385) 1 This print-out should have 20 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. This assignment is to get you started on the Fundamentals which are in Chapters 1-4 in our book. These are also the topics that ALEKS is supposed to help teach you. 001 10.0 points Which of the following is a chemical property of sulfur? 1. melts at 119 C 2. density of 2.07 g/ml 3. burns in air correct 4. dissolves in carbon disulfide Explanation: Burning in air as opposed to melting or dis- solving shows a change it undergoes in chem- ical composition. Melting and dissolving are physical properties not chemical. 002 10.0 points Which of the following describes a chemical change? 1. wood is carved 2. water is heated from 0 C to 50 C 3. gasoline burns in an engine correct 4. alcohol evaporates Explanation: A chemical change occurs when one or more substances are consumed (at least partially), and one or more new substances are formed. 003 10.0 points Which of the following is an intensive prop- erty? 1. density correct 2. mass 3. weight 4. volume 5. number of moles of molecules Explanation: Intensive properties are independent of the amount of matter present. The density of a substance will be the same regardless of the size (large or small) of the sample. 004 10.0 points Which of the following is an extensive prop- erty? 1. mass correct 2. temperature 3. heat of fusion 4. boiling point Explanation: Extensive properties are those which de- pend on the amount of substance present. Mass depends and is directly proportional to the amount of matter present. 005 10.0 points A pure substance made up of the same kind of atoms is called 1. a pure mixture. 2. a chemical bond. 3. a compound. 4. an element. correct 5. None of these 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.
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saldana (avs387) – H01: Fundamentals – Mccord – (52385) 2 006 10.0 points The measurement 3 . 2 × 10 3 g could also be written as 1. 3.2 kg. 2. None of these 3. 3.2 g. 4. 3.2 pg. 5. 3.2 mg. correct Explanation: mg refers to 10 3 . 007 10.0 points A pipe drips at 155 mL/min. Express this is units of gallons/day. 1. 15.7 gal/day 2. 2.34 gal/day 3. 377 gal/day 4. 58.9 gal/day correct 5. 942 gal/day 6. 0.223 gal/day 7. 223 gal/day Explanation: ? gal day = 155 mL min × 1 L 1000 mL × 1 gal 3 . 785 L × 60 min 1 hr × 24 hr 1 day = 58 . 9 gal day 008 10.0 points Balance the equation ? H 2 CO + ? H 2 O ? CH 4 + ? O 3 .
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