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Ch1 Example Problems Answers

Ch1 Example Problems Answers - HODSON CHE 1301 Ch1 Example...

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HODSON CHE 1301 Ch1 Example Problems Answers The following problems are taken from old exams…… 1) Which of the following is a heterogeneous mixture? A) vinegar B) water C) root beer float D) sugar E) vegetable oil Answer: C Explanation: A heterogeneous mixture has different properties and composition in different parts of the mixture. Imagine a beaker (or glass) containing samples of each of the above .... vinegar from the top of the glass would be exactly the same as vinegar from any other part of the glass. The same goes for B and E. In a root beer float, you could take a drink from the top of the glass and just end up getting ice cream (yum); taking a sip through a straw from the bottom of the glass would just give you root beer. The mixture hence varies. 2) What is the mass, in lb, of a 225 g object? (note that 1 lb = 0.4536 kg) 225 g × (1 kg / 1000 g) × (1 lb / 0.4536 kg) = 0.496 lb Note that we have only 3 significant figures, as the data with the least number of s.f.s is 225 g. 3) Which of the following processes does not represent a chemical change?
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