8/10/2019 Tugas Kimia Bab 1 Kelas A

1/2

1.11 Classify each of the following as a pure substance or amixture. If a mixture, indicate whether it is homogeneousor heterogeneous: (a) rice pudding, (b) seawater,(c) magnesium, (d) gasoline.

1.13 Give the chemical symbol or name for the followingelements, as appropriate: (a) sulfur, (b) magnesium,(c) potassium, (d) chlorine, (e) copper, (f) F, (g) Ni,(h) Na, (i) AI, (j) Si.

1.15A solid white substance A is heated strongly in the absenceof air. It decomposes to form a new white substanceB and a gas C. The gas has exactly the sameproperties as the product obtained when carbon is

burned in an excess of oxygen. Based on these observations,can we determine whether solids A and B and thegas C are elements or compounds? Explain your conclusionsfor each substance.

1.17 1n the process of attempting to characterize a substance,a chemist makes the following observations: The substanceis a silvery white, lustrous metal. It melts at 649oc and boils at 1105 oc. Its density at 20 oc is1.738 g/cm3The substance burns in air, producing an

intense white light. It reacts with chlorine to give a brittlewhite solid. The substance can be pounded into thinsheets or drawn into wires. It is a good conductor ofelectricity. Which of these characteristics are physicalproperties, and which are chemical properties?

1.19 Label each of the following as either a physical processor a chemical process: (a) corrosion of aluminum metal,(b) melting of ice, (c) pulverizing an aspirin, (d) digestinga candy bar, (e) explosion of nitroglycerin

1.21 Suggest a method of separating each of the followingmixtures into two components: (a) sugar and sand,(b) iron and sulfur.

1.23 What exponential notation do the following abbreviationsrepresent: (a) d, (b) c, (c) f, (d) (e) M, (f) k, (g) n,(h) m, (i) p?

1.25 Make the following conversions: (a) 62 oF to oC, (b) 216.7o

C too

F, (c) 233o

C to K, (d) 315 K too

F, (e) 2500o

F to K.

8/10/2019 Tugas Kimia Bab 1 Kelas A

2/2