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Solve the problems below:
1. There is a light bulb in a 120. V circuit with a resistance of 100. ohms. What is the current through the bulb?
2. What is the weekly energy cost of leaving a 65 W bulb on for half the day if the electricity cost is $0.15 per kWh?
3. An electric motor draws a current of 12 A in a 240 V circuit. What is the power of this motor in W?
4. The step-down transformer in a local neighborhood reduces the voltage from a 7,200 V line to 120 V.
(a) If there are 2400 loops on the primary coil, how many are on the secondary coil?
(b) What current does the transformer draw from the line if the current in the secondary is 24 A?
(c) What are the power input and output?
A 0.107 M HCl solution is used to titrate a solution of Ba(OH)2. It was found that 37.6 mL Ba(OH)2 was titrated by 43.8 mL HCl. What is the molarity of the Ba(OH)2 solution?)
The meniscus of mercury in a glass capillary tube is convex because of A)the very high density of mercury as compared with water. B)the low surface tension of mercury
The rate constant for a certain reaction is K = 8.90×10^-3 . If the initial reactant concentration was 0.950 M, what will the concentration be after 14.0 minutes.
How tdo you rotate fischer projections to figure out if they are D/L configurations. I know the difference between D/L but unsure of how to rotate them! Please you examples of D/L-Alanine
if it takes 526 j of energy to warm 7.40 grams of water by 17 degrees celsius how much energy would be needed to warm
Write the equilibrium expression, and calculate the equilibrium constant for this reaction at this temperature.
A 25.00 mL aliquot of iron solution was titrated to equivalence with 26.19 mL of 0.0215 M KMnO4. A procedure similar to the one in experiment 7 was followed. Calculate the moles of iron in the original volumetric flask.
a 42 gram block of an unknown metal at 86.0oc was dropped into an insulated flask containing approximately 50.0 grams
Calculate its standard heat of combustion in kilojoules. Methyl tert-butyl ether (MTBE), , a gasoline additive used to boost octane ratings, has = -313.6.
A particular sports drink contains about 300 ppm sodium by mass. How many milligrams of sodium would be in an 8 oz. bottle of this beverage. Assume the density of the sport drink is 1.14 g/ml.
Consider the following entities: SiH3Cl, Kr, SiH3F, and NH3. (a) Which one will diffuse the fastest? (b) What is the rms speed (m/s) of the slowest-moving atom or molecule at 25°C?
Can anyone help me with bromination and why it is more selective than chlorination. We have to use endo and exothermic graphs to explain
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