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Chemistry
Chemistry
High School
How much energy is radiated by a non-spinning black hole that accretes 10-7 Msun per year? We compute this using L=Mc2 (where M is the accretion rate). Putting in the numbers, we find L=0.06(10-7 x 6.3 kg/s)(3 x 108 m/s)2 = 3.4 x 1031.
Chemistry
High School
As a pure element the oxidation number of magnesium (Mg)is _____, but in compounds such as MgCl2 its oxidation number is _____.O 0,+1O +2,0O 0.+2O +1.0
Chemistry
High School
The breakdown of a certain pollutant X in sunlight is known to follow first-order kinetics. An atmospheric scientist studying the process fills a 20. 0Lreaction flask with a sample of urban air and finds that the partial pressure of X in the flask decreases from 0. 473atm to 0. 376atm over 5. 6hours. Calculate the initial rate of decomposition of X, that is, the rate at which Xwas disappearing at the start of the experiment. Round your answer to 2 significant digits
Chemistry
High School
if you are given three different capacitors C1, C2, and C3, how many different combiations of capacitance can you produce, using all capacitors in your circuits?
Chemistry
High School
December 13, 2018Partly cloudy skies in the morning will give way to cloudy skies during the afternoon. It is around 30C with winds of 15 to 25 kph form northeast (NE). The chance of rain is at 20%.Chance of rain-Minimum Wind Speed-Maximum Wind Speed- Temperature-Clouds-Rainfall-Interpretation
Chemistry
High School
which compounds used in this experiment should one be careful with when using a hot plate? 4-methylphenol and diethyl ether 2-methyl-2-propanol and sulfuric acid diethyl ether and tert-butanol 4-methylphenol and glacial acetic acid
Chemistry
College
A steel cylinder holds 1.50 g of ethanol, C2H5OH. What is the pressure of the ethanol vapor if the cylinder has a volume of 200 cm3 and the temperature is 250C? (Assume all the ethanol is in the vapor phase at this temperature.)
Chemistry
College
Which statement about the reaction between calcium oxide and water is correct?a) 65.2 kJ of heat are released for every mole of CaO that reacts.b) 130 kJ of heat are released for every mole of H2O that reacts.c) 130 kJ of heat are absorbed for every mole of CaO that reacts.d) 65.2 kJ of heat are absorbed for every mole of H2O that reacts.
Chemistry
High School
Send HELP!!!!!!!!!!!!!!!!!!!
Chemistry
High School
if a solution originally 0.532 m in acid ha is found to have a hydronium concentration of 0.112 m at equilibrium, what is the percent ionization of the acid?
Chemistry
High School
Each mole of al(no3)3 contains how many moles of oxygen atoms? 1. 3 mol 2. 9 mol 3. 12 mol 4. 1 mol 5. 6 mol
Chemistry
High School
how many grams of n2 are required to completely react with 3.03 grams of h2 for the following balanced chemical equation? A. 1.00 B. 6.00 C. 14.0 D. 28.0
Chemistry
High School
each of the following contains about 5 grams of pure fat except:A. 1 tablespoon oilB. 1 1/2 tablespoon sour creamC. 1 1/2 tablespoon mayonnaiseD. 1 tablespoon of cream cheese
Chemistry
College
When a hydrogen atom is added to a polyatomic ion, the amount of negative charge . Following this pattern, we can see that hydrogen carbonate has a charge of and hydrogen sulfate has a charge of .
Chemistry
High School
in an endothermic reaction, the total energy at the beginning of the reaction is group of answer choices less than the total energy at the end of the reaction. greater than the total energy at the end of the reaction. equal to the total energy at the end of the reaction. none of the above
Chemistry
High School
A solution has a concentration of 3.0 M and a volume of 0.20 L. If the solution is diluted to 4.0 L, what is the new concentration, in molarity?Your answer should have two significant figures.
Chemistry
High School
if 10 grams of aluminum reacts with 4 grams of oxygen, what is the expected grams of product?
Chemistry
High School
Gallium has two naturally occurring isotopes. The mass of gallium-69 is 68. 9256 amu and it is 60. 108% abundant. The mass of gallium-71 is 70. 9247 amu and it is 39. 892% abundant. Find the atomic mass of gallium
Chemistry
High School
which buffered solution, buffer a or buffer b, would be more resistant to ph change when a strong acid or a strong base is added? justify your answer.
Chemistry
College
5. An unknown metal has a mass of 4.67 g. It is heated to 95.1C and then placed in acalorimeter that contains 24.3 g of water at 21.7C. The metal and water both reacha final temperature of 24.6C. What is the specific heat of this metal? What is theunknown metal?
Chemistry
High School
the following thermochemical equation is for the reaction of n2 with h2 to form nh3. how many grams of n2 would have to react to produce 31.5 kj of energy?
Chemistry
High School
1) For each pair of reactants,will there be a reaction? Co(s) + HCl (aq)Cd(s) + H2SO4 (aq)Cr(s) + Co(NO3)2 (aq)Ni(s) + Li2CO3 (aq)
Chemistry
High School
In what way was the reaction of the splint and CO2 different from the reaction of the H2 to the flaming splint
Chemistry
High School
The last 4 miles in the activity series of metals are commonly referred to as the "coinage medals". Why would these metals be chosen over more active metals for the use in coins? Why do you think some more active metals, such as zinc or nickel, or sometimes used in coins?
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