a.|0.000 044 m|c.|0.44 m| b.|440 000 m|d.|0.044 m| 12. What is the volume of 80.0 g of ether if the density of ether is 0.70 g/mL? a.|5.6 10|c.|8.8 10| b.|1.1 10|d.|8.0 10| 13. If the temperature of a piece of steel decreases, what happens to its density? a.|The density decreases.| b.|The density increases.| c.|The density does not change.| d.|The density first increases,
How many individual atoms are there in 250 grams of O2? A. 4.70 x 1024 atoms C. 4.70 x 10 -24 atoms B. 4.70 x 1023 atoms D. 4.70 x 10 -25 atoms 7. The mass of one mol is called ________ A. molecule B. molar mass C. percent composition D. percent yield 8.
Who is right, John or Anna? Explain your answer. 3 When 200 g of calcium nitrate, Ca(NO3)2.2H2O is heated at 120ºC the mass decreases by 36 g. (a) Why does the mass decrease? (b) How much calcium nitrate is left after heating? 4 Calculate the molar mass of these compounds: (relative atomic masses: H = 1; N = 14; O = 16; S = 32; Cu = 64; Br = 80; Pb = 207) (a) copper nitrate, Ca(NO3)2 (b) lead bromate, Pb(BrO3)2 (c) ammonium sulfate, (NH4)2SO4 5 The equation for the complete combustion of methane is shown below.
At 225.0 °C a gas has a volume of 400.0 mL. What is the volume of this gas at 127.0 °C? Gay-Lussac ‘s Law: 1. Gives the relationship between pressure and temperature when volume and amount are held constant. If the temperature of a container is increased, the pressure increases.
What will be the new volume when the pressure drops to 43.0 kPa? Formula- P1 = 101 kPa P2= 43.0 kPa V1 = 10.0 L V2 = ? V2 = (101 kPa) (10.0 L) /43.0 kPa= 23.5 L Charles law also known as the law of volumes, describes how gases tend to expand when heated. It was first published by philosopher Joseph Louis Gay-Lussac in 1802, but he credited it to Jacques Charles, and named the law in his honor. Around 1787 Charles did an experiment where he filled 5 balloons to the same volume with different gases.
d. Their values get larger as the temperature is increased. e. An order equal to zero means there is no concentration dependence with rate. 2. The gas phase reaction A + B C has a reaction rate which is experimentally observed to follow the relationship rate = k[A]2[B]. The overall order of the reaction a. is first.
2. Explain what relationship exists between the pressure and volume of a gas (assuming a constant temperature), based on your collected data. Answer: The relationship between Pressure and Volume is inversely proportional. As one decrease, the other increases. P1V1=P2V2 3.
Part E – Deriving a solubility curve Aim: To be able to calculate the solubility of the compound in a certain amount of water as the temperature increases or decreases. Hypothesis: As the water increases, the solubility decreases and the substance’ saturation would get lower. And as the volume increases, the substance won’t separate to the water anymore which makes it dissolved forever without getting crystallized when the water cools down. Apparatus & Method: [refer to the sheet p. 64] Result: Temperature | Volume [ml] | Solubility [g/100g] | 65 ̊ C | 5 ml | 130.44 g | 46 ̊ C | 8 ml | 81.525 g | 39 ̊ C | 11 ml | 59.29 g | 28 ̊ C | 14 ml | 46.586 g | 22 ̊ C | 17 ml | 38.36 g | 16 ̊ C | 20 ml | 32.61 g | 12 ̊ C | 23 ml | 28.35 g | 12 ̊ C | 26 ml | 25.08 g | The solubility was calculated with the formula of: Solubility=6.522gml of waterx 100 The solubility of Potassium Nitrate is directly affected by the temperature of the solution. As the temperature of the solution rises, the solubility of Potassium Nitrate increases.
Comparing the rate of appearance of C and the rate of disappearance of A, we get[pic]. A) [pic] B) [pic] C) [pic] D) [pic] E) [pic] Answer: A Diff: 1 Page Ref: Sec. 14.2 A flask is charged with 0.124 mol of A and allowed to react to form B according to the reaction A(g) →B(g). The following data are obtained for [A] as the reaction proceeds: [pic] 5) The average rate of disappearance of A between 10 s and 20 s is __________ mol/s. A) [pic] B) [pic] C) [pic] D) 454 E) [pic] Answer: A Diff: 1 Page Ref: Sec.
A) mesosphere B) tropopause C) thermosphere D) stratopause E) mesopause Answer: B Diff: 1 Page Ref: Sec. 18.1 5) The pressure of the atmosphere __________. A) increases with altitude B) follows the same trend as temperature C) decreases with altitude D) follows the reverse trend as temperature E) stays the same Answer: C Diff: 1 Page Ref: Sec. 18.1 6) [pic] What is the partial pressure or oxygen (in torr) in the atmosphere when the atmospheric pressure is 760.0 torr? A) 159 B) 430 C) 601 D) 720 E) 760 Answer: A Diff: 1 Page Ref: Sec.