QUESTION 14 A candle made of a certain wax blend burns at a rate of 25.0 milligrams/minute. What is the value of this burn rate if expressed in grams/hour? 2,040 g/hr 1,760 g/hr O 2.04 g/hr 1.50 g/hr QUESTION 15
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- A certain half-reaction has a standard reduction potential E =-1.25 V. An engineer proposes using this half-reaction at the cathode of a galvanic cell that must provide at least 0.80 V of electrical power. The cell will operate under standard conditions. Note for advanced students: assume the engineer requires this half-reaction to happen at the cathode of the cell. h Data Ag+ (aq) + e Ag (s) 0.7996 Is there a minimum standard reduction potential that the half-reaction used at the anode of this cell can have? yes, there is a minimum. Ered = v !! Al3+ (aq) + 3e-- Al (s) -1.676 Au+ (aq) + e Au (s) 1.692 If so, check the "yes" box and calculate the minimum. Round your answer to 2 decimal places. If there is no lower limit, check the "no" box. Au3+ (aq) + 3e - Au (s) 1.498 O no minimum Ba2+ (ag) + 2e - Ba (s) -2.912 Brz (1) + 2e- 2Br (aq) 1.066 Ca2+ (ag) + 2e - Ca (s) -2.868 Is there a maximum standard reduction potential that the half-reaction used at the anode of this cell can have? E=…ESTION 39 In the reaction below, if you react 0.11 g Mg with excess HCI, how many grams of H2 will be produced? Mg (s) + 2 HCI (aq) → MgCl2 (aq) + H2 (g) 4.5 x 10-2 g 9.0 x 10-3 g 9.0 x 10-2 g 4.5 x 10-3 g QUESTION 40 A spectrophotometer is used to O measure the density of a gas phase product Click Save and Submit to save and submit. Click Save All Answers to save all answers. 梦 $ a. ho t9 144 f6 10 fs 米 12 & 4 5. L. 2 W E R T. Y 00 %24 3. 23Detonation of nitroglycerin proceeds as follows:4 C3H5N3O9(l)------>12 CO2(g) + 6 N2(g) + O2(g) + 10 H2O(g)(a) If a sample containing 2.00 mL of nitroglycerin (density =1.592 g/mL) is detonated, how many moles of gas are produced?(b) If each mole of gas occupies 55 L under the conditionsof the explosion, how many liters of gas are produced?(c) How many grams of N2 are produced in the detonation?
- Part A How many oxygen atoms are on the right-hand side of the following chemical equation? 4FECO3(s) + 02(g) → 2FE203(s) + 4CO28) Express your answer as integer. fempEes Symbols uado redo reset keyboard shortcuts help oxygen atoms Submit Previous Answers Request Answer x Incorrect; Try Again; 2 attempts remainingQuestion 18 of 31 How many atoms of mercury are required to produce 3.49L of H2 gas (density = %D 0.0899 g/L ) according to the balanced chemical reaction: 2 Hg(1) + 2 HNO:(aq) → Hg (NOs):(aq) + H2(g) 0.0899 1 H2 g H2 ADD FACTOR DELETE ANSWER RESET -( ) 525.2 1 2.02 1.87 x 1023 1.87 63.01 2 1.01 9.42 x 1020 7.20 x 1020 9.35 x 1022 3.49 0.0899 200.6 6.022 x 1023 g Hg:(NO:)2 mol H2 mol Hg mol Hg:(NO:)2 g H2 g H2/L atoms Hg mol HNO, L H2 g HNO,Metal Observations Ca All the calcium reacted in less than 30 seconds. There was a vigorous production of a gas. Fe Most of the iron reacted very slowly. There was a slow production of a gas. Some of the iron never totally reacted. Cu No visible reaction. Mg All of the magnesium reacted in abbut three minutes. There was a moderate production of a gas. A student puts samples of four different metals of equal mass into HC1(ag) and records observations in the table. Which of the following ranks the metals from least reactive to most reactive? A Ca < Fe < Cu < Mg Ca < Mg < Fe < Cu C Cu < Fe < Mg < Ca Cu < Ca < Mg < Fe
- LWR # 1 Apply Stoichiometry A student performed an experiment to find the amount of sodium carbonate, (Na₂CO₂) that is produced from the decomposition of baking soda, NaHCO, by heating. Decomposition of baking soda: 2NaHCO,> Na₂CO, + CO₂ + H₂O The following data were collected. Complete the data table. Mass of empty evaporating dish 24.353 grams Mass of evaporating dish and baking 27.868 grams soda 26.885 grams Mass of evaporating dish and sodium carbonate Mass of baking soda 84.007 g/mol Mass of sodium carbonate (experimental) 105.9888 g/mol Molar mass of baking soda 84.007 g/mol Molar mass of sodium carbonate 105.9888 g/mol 1.678 grams > Theoretical (calculated) mass of sodium carbonate 09314 g/mol Calculate percent error of the analysis (1105.9888-09314) +100/.09314 = 9.8% 1 = Atomic mass: Na = 23.0g; H=1.0 g; C=12.0g; O=16.0g % error = (Experimental-Calculated) x 100/ CalculatedD Part A Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: Cab(s) + H₂O() → Ca(OH)2(s) A 4.60 g sample of CaO is reacted with 4.44 g of H₂O. How many grams of water remain after the reaction is complete? 1.48 g 0.247 g #3 2.96 g O 0.165 g O 0.00913 g Submit Provide Feedback Request Answer $ 4 % LO 5 Search or type URL 6 & 7 * 8 1Choose the correct option for each question below In case of chemical burns in the laboratory, you should not do one of the following: 1) Cover with dry, clean or sterile material. 2) Rinse the area with large quantities of water. 3) Apply burn ointments or sprays to affected areas. 4) Call emergency services if large areas of victim’s body are affected.
- Chemical Use of PPM The OSHA 8-hour HCN limit is at 10.0 ppm. According to the Merck Index, 300 mg/kg of air at room temperature is the lethal dose of HCN in air. In what mg HCN/kg air is 10.0 ppm present? What percentage of a dose is 10.0 ppm?assessment.education.wiley.com/was/ui/v2/assessment-player/index.html?launchld%35cc1a953-8d65-416d-86a1-1265784ce2af#/questic Apps e Ch 9: Homework Question 11 of 12 0/1 E After 180.0 g of zinc was dropped into a beaker of hydrochloric acid and the reaction ceased, 19.1g of unreacted zinc remained in the beaker: Zn + HČI → ZNCI2 + H2 X Incorrect. Did you balance the reaction? (a) How many grams of hydrogen gas were produced? 24029 g H2 Hint Type here to searchQuestion Metal Observations Ca All the calcium reacted in less than 30 seconds. There was a vigorous production of a gas. Fe Most of the iron reacted very slowly. There was a slow production of a gas. Some of the iron never totally reacted. Cu No visible reaction. Mg All of the magnesium reacted in about three minutes. There was a moderate production of a gas. A student puts samples of four different metals of equal mass into HC1(ag) and records observations in the table. Which of the following ranks the metals from least reactive to most reactive? A Ca < Fe < Cu < Mg B Ca < Mg < Fe < Cu Cu < Fe < Mg < Ca D Cu < Ca < Mg < Fe
