Unit+2+-+Classification+of+Matter

1) Which of the following can be best classified as a homogeneous mixture. a. Veggie soup __b. copper wire__ c. pizza d. hot tea

2) Which of the following statements about compounds is true? a. A compound contains only one element. __b. A compound can be classified as either heterogeneous or homogeneous__. c. A compound has a defined ratio by mass of the elements that it contains. d. A compound varies in chemical composition depending on the sample size.

3) Which of the follow is an element? a. BaCl2 b. CO __c. He__ d. NaOH

4) Which of the following is an endothermic physical change? a. An explosion b. Melting of butter c. Condensation of a gas __d. Formation of a solid when two liquids are mixed__

5) Every chemical change involves a. The formation of a different substance b. The vaporization of a liquid c. Separation of states of matter __d. The release of energy.__

6) What law is described by the fact that carbon dioxide (CO2) consists of 27.3% C and 72.7% O by mass? __a. Law of Conservation of Mass__ b. Law of Definite Proportions c. Law of Multiple Proportions d. None of the laws we learned

7) What law supports the idea that carbon dioxide (CO2) and carbon monoxide (CO) can both be formed under given laboratory settings? a. Law of Conservation of Mass __b. Law of Definite Proportions__ c. Law of Multiple Proportions d. None of the laws we learned

8) If 5.235 g of S and 5.314 g of O2 react to form sulfur dioxide (SO2), how much sulfur dioxide (SO2) will be formed? a. 5.235 g SO2 b. 5.314 g SO2 c. 0.079 g SO2 __d. 10.549 g SO2__