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Unformatted text preview: solis (nrs545) – H01: Fundamentals – McCord – (53130) 1 This print-out should have 20 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. Although ALEKS is supposed to be testing and assessing you in the “Fundamentals”, I’m still providing this ONE homework assign- ment over that type of material. We will work through this semester assuming you know this type of stuff. I’ll will put the due date on this about 2 weeks from now. Still, you DO need to work it and do as well as you can. 001 10.0 points Which of the following is a chemical property of sulfur? 1. dissolves in carbon disulfide 2. density of 2.07 g/ml 3. melts at 119 ◦ C 4. burns in air correct 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. number of moles of molecules 2. density correct 3. volume 4. weight 5. mass 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. heat of fusion 3. boiling point 4. temperature 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. None of these 2. a compound. 3. a chemical bond. 4. a pure mixture. 5. an element. correct 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. solis (nrs545) – H01: Fundamentals – McCord – (53130) 2 006 10.0 points The measurement 3 . 2 × 10 − 3 g could also be written as 1. 3.2 pg. 2. 3.2 mg. correct 3. None of these 4. 3.2 g. 5. 3.2 kg. Explanation: mg refers to 10 − 3 . 007 10.0 points A pipe drips at 155 mL/min....
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This note was uploaded on 09/24/2010 for the course CH 301 taught by Professor Fakhreddine/lyon during the Spring '07 term at University of Texas.
- Spring '07