lead, merd hose with silver Chemistry 152 Final Exam A Multiple Choice (4 points

Question

lead, merd hose with silver Chemistry 152 Final Exam A Multiple Choice (4 points each) 6. Which of the following is NOT a physical property? a. color b. flammability c. density d. boiling point 7. The difference between a mixture and a compound is a. a mixt B. a mixture is made from simpler substances and a compound is not C. a mixture can be separated by taking advantage of differences in physical properties d. mixtures and compounds are the same ure is a pure substance and a compound is not of the components 8. As we go across a row on the periodic table a. metals become more reactive while nonmetals become less reactive b. metals become less reactive while nonmetals become more reactive c. both metals and nonmetals become more reactive d. both metals and nonmetals become less reactive 9. For an ideal gas at constant temperature and pressure a. the volume is also constant b. the volume varies as the number of moles c. the volume varies inversely as the number of moles d. the volume and number of moles are unrelated 10. Which of the following is true for an acid. a. they are electron donors b. they have high pH c. they produce H30* d. they are very unreactive

Explanation / Answer

1.)Physical properties are those properties which are measurable. Here color, density and boiling point are physical properties. Only inflammability is not a physical property => answer b

2.) a mixture is simple amalgamation of two or more substanced which can be separated out on the basis of difference in physical properties where as compund is formed from chemical reaction between two or more substances to form a new substance => answer c

3.) as we move across a row in periodic table , reactivity of metals decreases and reactivity of non-metals increases. This is because

ionization energy for metals increases as we move across => difficult to give electron and for nonmetals electron affinity increases => can easilty take up electron => answer b

4) ideal gas equation PV=nRT

if Pand T are constant V is directly proportional to n => answer b

5) acid provide H+ ions which lowers the pH of solution and forms [H3O+] =>answer c

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