The temperature of a 0.750-L gas sample at 25 degree C and 2.00 atm is changed t

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The temperature of a 0.750-L gas sample at 25 degree C and 2.00 atm is changed to 250 degree C. What is the final pressure of the system, at constant volume? 0.427 atm 20.0 atm 0.200 atm 3.51 atm How many milliliters of a 5.25% (w/v) HCI solution must be used to prepare 250 mL of a 0.175% (w/v) HCI solution? 240 mL HCI solution 7,500 mL HCI solution 230 mL HCI solution 8.3 mL HCI solution 8.6 mL HCI solution Air pressure at the bottom of Death Valley, at 282 ft below sea level, is 776 mm Hg. What are the partial pressures of O2 and N2, which compose 20.9% and 78.1% of the atmosphere, respectively? 160 mm Hg O2 and 590 mm Hg N2 606 mm Hg O2 and 162 mm Hg N2 209 mm Hg of O2 and 781 mm Hg of N2 162 mm Hg of O2 and 606 mm Hg of N2 How many iron atoms are in 0.550 mol of Fe203? 6.62 Times 1023 iron atoms 3.31 Times 1023 iron atoms 6.62 iron atoms 1.83 Times 10-24 iron atoms 6.02 Times 1023 iron atoms Which pair of compounds will form a solution? H2O and CCI4 NaCI and hexane (C6H14) Benzene (C6H6) and hexane (C6H14) More than one of the combinations above will form solutions. Na2S04 and benzene (C6H6) Identify the species that is oxidized and the species that is reduced in the reaction: 2 I- + CI2 rightarrow 2 Cl- + I2. I- is oxidized and CI2 is reduced. I2 is oxidized and Cl- is reduced. Cl2 is oxidized and I- is reduced. Cl2 is oxidized and Cl- is reduced. I2 is oxidized and 1- is reduced. A saline solution used in intravenous drips for patients who cannot take oral fluids contains 0.92% (w/v) NaCl in water. What volume of the saline solution must be administered to the patient in order to deliver 7.7 g of NaCl?140 mL of saline solution 840 mL of saline solution 8.4 mL of saline solution 7.1 mL of saline solution Which sample contains the largest number of molecules? 100 g of CHBr3 100 g of CH4 100 g of CO2 100 g of CBr4 A sample of seawater contains 1.3 g of calcium ions in 3,100 kg of solution. What is the calcium ion concentration of this solution in units of ppm? 0.42 ppm Ca2 + ions 420 ppm Ca2+ ions 4.2 Times 10-4 ppm Ca2+ ions 4.0 Times 103 ppm Ca2+ ions 4.0 ppm Ca2+ ions Which substance is a colloid? a dental filling gasoline mayonnaise mint chocolate chip ice cream The Greek letter delta (Delta) may be written over the reaction arrow in a chemical equation to indicate that heat is needed for the reaction to occur. a catalyst is needed for the reaction to occur. water is needed for the reaction to occur. heat is generated when the reaction occurs. How many moles of carbon dioxide are in 211 g of carbon dioxide? 7.53 mol of C02 9280 mol of CO2 167 mol of CO2 4.80 mol of CO2

Explanation / Answer

1 B

2. D

3.D

4. A

5.C

6.A

7.B

8.B

9.B

10.D

11.A

12.A

13 .D

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