10 aH (40 gmol) were used to prepare 500 mL of solution, what would the concentr

Question

10 aH (40 gmol) were used to prepare 500 mL of solution, what would the concentration a. 6 M b. 2 M c. 1M What is the formula unit mass of chromium(Ill) oxide (CrO,)? a. 104.0 amu b. 152.0 amu c. 120.0 amu d. 4 M e. 3 M 10. d. 136.0 amu e 68.0 amu 11. Which statement corectly describes the properties of gaseous helium (He)? A gas takes the shape of the container, but its total volume cannot change. The gas is highly compressible because there is a lot of empty space The gas is not highly compressible even though the atoms do not occupy volume of the container The gas has a definite volume and shape because container The atoms are moving rapidly about the container, giving the gas its a. b. c. between the atoms the entire d the atoms are not moving about the atoms are moving rapidly about the container, giving the gas its definite shape. e 12. A barometer measures a pressure of 745 mmHg What is this pressure in atm? 1.00 ×104 atm a. b. 1.02 atm C. 1.03 × 105 atm Which of the following is a pure substance? a. b. c. d. 0.556 atm e. 0.980 atm -13. seawater brass (an alloy of copper and zinc) sucrose (table sugar) d. beer e. blood 14. What volume of 12.0 M HCI solution needs to be diluted to produce 500.0 mL of 3.00 M HC a. 0.125 L d. 0.250L e. 0.500 b. 1.00L c. 2.00 L Which one of the following represents a physical change? a. Sugar ferments to form ethanol. b. An egg begins to smell very bad. c. Milk turns sour Concentrated sulfuric acid contains 4 g of water for every 100 g of solution. The solvent is a. b. c. 15. d. Rust forms on iron nails e. Sugar melts and forms a syrupy liquid. 16. d. sulfuric acid. e. the same as the solution. concentrated. the same as the solute in this case. water. Which subatomic particles have opposite charges? a. neutrons and electrons all neutrons protons and neutrons 17. d. e. b. all protons c. protons and electrons 18. The atomic radius of a uranium atom is approximately 175 pm. In correct scientific notati 1.75 x 10-10 m. 1.75 × 10-12 m. d. 1.75 × 10-11 m. 1.75 x 1010 m. 175 x 10-12 b. 1.75 x 1O

Explanation / Answer

10. b

11. b

12. e

13. c

14. M1V1 = M2V2

   12*V1 = 500*3

V1 = 125 ml

answer: a

15. e

16. d

17. c

18. d

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