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#Chem 161-2007 Exam I + answers

#Chem 161-2007 Exam I + answers - CHEM 161-2007 EXAM I...

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CHEM 161-2007 EXAM I + ANSWERS Chem 161-2007 Exam I Hill, Petrucci et al., 4 th edition Chapter 2 – Atoms, molecules and ions Periodic table 1. Which element is a transition metal? A. Na B. Al C. Pb D. Be E . Fe The transition metals are the b group metals between groups IIa and IIIa. Na is in group Ia; Al is in group IIIa; Pb is in group IVa; Be is in group IIa; Fe is in group VIIIb; therefore it is a transition metal. Chem 161-2007 Exam I Hill, Petrucci et al., 4 th edition Chapter 2 – Atoms, molecules and ions Organic compounds 2. What is the correct name for the compound below: H 3 C—CH 2 CH—OH H 3 C—CH 2 D . 3-pentanol The longest carbon chain has 5 carbon atoms, and is therefore pentane. Since the hydroxyl group is on the third carbon atom, the compound is called 3-pentanol. Chem 161-2007 Exam I Hill, Petrucci et al., 4 th edition Chapter 1: Chemistry: Matter and Measurement Classification of matter 3. Which of the following is an example of a chemical change?
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D . Photosynthesis turning CO 2 and water into glucose A chemical change is one in which the structure of the molecule changes. A. When ice melts, H 2 O(l) becomes H 2 O(g); hence the molecule doesn’t change, so this is a physical change, not a chemical change. B. Adding carbon to iron to make steel does not result in a reaction of the iron in the steel. That is, addition of carbon to the iron in steel only affects the physical property of the steel; it does not change the structure of the iron. Therefore, it is a physical change, not a chemical change. C. CO 2 escaping from soda only causes the CO 2 to go from a hydrated state to an unhydrated state; it does not result in a change in the structure of CO 2 . Therefore, it is a physical change, not a chemical change. D. When CO 2 is changed into glucose during photosynthesis, the structure of CO 2 changes into a different structure, such as glucose (C 6 H 12 O 6 ) (upon reaction with H 2 O); hence this is a chemical change. E. Sugar crystallizing from honey is just a separation of the sugar from the honey. It is not a chemical change of sugar into another molecule. Therefore, this is a physical change. Chem 161-2007 Exam I Hill, Petrucci et al., 4 th edition Chapter 1 – Chemistry: Matter and Measurement Units/unit conversions/dimensional analysis
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