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Unformatted text preview: gonzales (pag757) 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, Im 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. Ill 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. density of 2.07 g/ml 2. dissolves in carbon disulfide 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. gasoline burns in an engine correct 2. alcohol evaporates 3. wood is carved 4. water is heated from 0 C to 50 C 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. weight 2. mass 3. density correct 4. number of moles of molecules 5. volume 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. heat of fusion 2. boiling point 3. temperature 4. mass correct 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. an element. correct 3. None of these 4. a chemical bond. 5. a compound. 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. gonzales (pag757) H01: Fundamentals McCord (53130) 2 006 10.0 points The measurement 3 . 2 10 3 g could also be written as 1. 3.2 kg. 2. 3.2 g. 3. 3.2 pg. 4. 3.2 mg. correct 5. None of these Explanation: mg refers to 10 3 ....
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- Fall '09