Unit+1+Review+Answers

p. 94 34. (a) intensive (b) extensive (c) intensive (d) extensive 38. (a) physical (b) physical (c) chemical (d) physical (e) chemical (f) physical 41. sucrose—it decomposes before it boils 43. (a) physical (b) physical (c) chemical (d) chemical (e) chemical 44. chemical—green bananas have different properties than yellow bananas 45. physical—the composition does not change 46. change in color, change in odor, change in temperature, producing a solid or gas 60. (a) same (b) different (c) different (d) same 82. (a) homogeneous (b) heterogeneous (c) heterogeneous (d) homogeneous 85. (a) homogeneous mixture (b) heterogeneous mixture (c) homo- or heterogeneous mixture depending on the soil sample (usually heterogeneous) (d) pure substance (compound) (e) heterogeneous mixture (f) heterogeneous mixture 86. (a) compound (b) homogeneous mixture (c) element (d) heterogeneous mixture (e) homogeneous mixture 56. mixtures are a physical blend of two or more substances in any proportion; their properties are a blend of what makes them up. 58. (a) magnet to draw the iron filings (b) add water, filter to separate sand; allow water to evaporate to retrieve the salt (c) use paper and water (d) cool until it condenses to a liquid, the distill it to separate the gases p. 26 34. weight—it is a measure of the force of gravity on an object; mass is independent of gravity