(3) Q5.18 Homework Unanswered If electricity costs $0.12 per kWh, then what is the total cost for a family of four to illuminate ten 60 watt bulbs each for 30 days? (Round to the nearest dollar) Type your numeric answer and submit Unanswered. 4 attempts left Submit

(3) Q5.18 Homework Unanswered If electricity costs $0.12 per kWh, then what is the total cost for a family of four to illuminate ten 60 watt bulbs each for 30 days? (Round to the nearest dollar) Type your numeric answer and submit Unanswered. 4 attempts left Submit

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Calcium carbonate is used in many antacids to neutralize stomach acid, as depicted by the following chemical equation: CaCO3(s) + 2 HCl(aq) → CaCl2 + H2O(l) + CO2(g) If 250. mg of calcium carbonate reacts with 2.609 g of hydrochloric acid, how much hydrochloric acid will remain? Provide your answer in g to 3 decimal places.
Consider the two spheres shown here, one made of silver and the other of aluminum. The spheres are dropped from a height of 1.7 m. Composition - aluminum Density= 2.70 g/cm³ Volume 196 cm³ Composition - silver Density 10.49 g/cm³ Volume=196 cm³ What is the kinetic energy of the silver sphere at the moment it hits the ground? (Assume that energy is conserved during the fall and that 100%% of the sphere's initial potential energy is converted to kinetic energy the time impact occurs.) Express your answer to two significant figures and include the appropriate units. Ek = Value Units
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Automobiles are often implicated as contributors to global warming because they are a source of the greenhouse gas CO2. How many pounds of CO2 would your car release in a year if it was driven 110. miles per week? Gasoline is a complex mixture of hydrocarbons. In your calculations, assume that gasoline is octane (molecular formula C8H18) and that it is burned completely to CO2 and H2O in the engine of your car. Also assume that the car averages 27.3 miles per gallon and that the density of octane is 0.703 g cm-3.
3. Now that you know the physical state of each of the reactants and products in this chemical reaction lets think about what you might observe as the reaction is running. CH_3COOH(aq) + NaHCO_3(aq) → H_2O(l) + CO_2(g) + CH_3COONa(aq) Upload a screenshot that shows how you performed all the calculations in Q3.
A gram of gasoline produces 45.0 kJ of energy when burned. Gasoline has a density of 0.77 g/mL. How would you calculate the amount of energy produced by burning 44. L of gasoline? Set the math up. But don't do any of it. Just leave your answer as a math expression. Also, be sure your answer includes all the correct unit symbols. energy produced = Continue 0x10 00 X 4 O 0.0 S revee muuraw Hill LLC. All Rights Reserved. Submit Assignment Terms of Use | Privacy Center | Accessibility
(Incorrect) An impure sample of hydrocarbon having a total mass of 41.0 g undergoes combustion analysis to generate 82.6 g CO₂(g) and 16.9 g H₂O(g). Assuming that the impurities do not contain carbon or hydrogen, what percentage of the initial sample is the pure hydrocarbon? Provide the numerical value of your response in decimal notation rounded to 3 significant figures. You answered: 4.58 The correct answer is: 59.5%
Please answer question 3
01. [02.01 The Atomic Theory of Matter / 02.02 The Discovery of Atomic Structure] [Answer: (a) Get the answers by yourself. (b) The charge on an electron = 9.60 × 10-9 wa, (c) A: 4e, B: 5e, C: 3e, D: 9e, (d) 6.00 x 107 wa/C.] Suppose a scientist repeats the Millikan oil-drop experiment but reports the charges on the drops using an unusual (and imaginary) unit called the warmomb (wa). The scientist obtains the following data for four of the drops: Droplet Calculated Charge (wa) A 3.84 x 10-8 (a) If all the droplets were the same size, which would fall most slowly through the apparatus? B 4.80 × 10-8 (b) From these data, what is the best choice for the charge of the electron in warmombs? C 2.88 x 10-8 D 8.64 × 10-8 (c) Based on your answer to part (b), how many electrons are there on each of the droplets? (d) What is the conversion factor between warmombs and coulombs?
Archimedes tells us the lifting power of a balloon (how much mass it can lift) is equal to the difference between the mass of the balloon and the mass of the air it displaces. That is, if the balloon occupies the same volume as 10 kg of air, but the balloon only weighs 2 kg, then the gas density kg 0.090 3 m H, balloon can lift 8 kg. Airships have sometimes been filled with hydrogen (H,), but hydrogen is very flammable, and kg 0.18 Не m after the Hindenburg caught fire and crashed in 1937 with serious loss of life airships have nearly always been filled with helium (He) instead. kg 1.23 3 m' air Suppose a new airship Star of Balogna will have the shape of a cylinder 100. m long, with a radius of 15.0 m, and will weigh 9400. kg without any gas inside it. Suppose also the average passenger weighs 81 kg. Calculate how many passengers the Balogna could carry if it were filled with hydrogen, and also if it were filled with helium. Passengers with H,: Passengers with He: