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Questions (247)

What is the reason Josh can't sleep before the big game in "The Main Reason I Can't Sleep"? Pg. 120
1. 1 answer
2. 133 views
The heights, h, of the students in the chorus at Central Middle Schoolsatisfy the inequality |h-57.5/2|¡Ü 3.25 when h is
1. 1 answer
2. 600 views
A person pushes a 10 kg box from rest and accelerates it to a speed of 3.2 m/s with a constant force. If the box is pushed for a
1. 2 answers
2. 783 views
What is the chemistry behind the ASA – FeCl3 reaction?
1. 1 answer
2. 410 views
I don't understand ehat is the chemistry behind the ASA – FeCl3 reaction? what is this question even asking? any response will
1. 1 answer
2. 407 views
OKOK I know that I have posted this question but I just don't understand the last part.50.0 ml of a 0.0500 M solution of lead
1. 1 answer
2. 1,006 views
Dr.Bob you had told me to ignore 2x so I wondering if I wrote my did these steps correctly.Calculate the molar solubility of
1. 2 answers
2. 709 views
I know you've read this question too many times already but I just want to make sure I did the last part (Ksp) correctly.50.0 ml
1. 1 answer
2. 586 views
i need to know what in the body there is 11 of or what 11 may relate to a certain body part?Need human physiology help here.
1. 2 answers
2. 545 views
how many moles of Cl- ion in the solution containing 0.187g Cl- dissolved in 50.0 ml water.
1. 3 answers
2. 926 views
What is the molarity of the Cl- ion in the solution of a sample containing 0.187g Cl- dissolved in 50.0 ml water?
1. 7 answers
2. 1,011 views
how much of each of the following substances would you add to water to prepare 1.20L of a .85M solution? (H2SO4 from
1. 3 answers
2. 613 views
how much of each of the following substances would you add to water to prepare 1.20L of a .85M solution? (sodium carbonate from
1. 2 answers
2. 932 views
I have the following problems- write net ionic equations for reactions if no reaction write NR....silver nitrate and ammonium
1. 2 answers
2. 1,086 views
what is the formula that will be used for this ?what volume of .100 M NaOH will react completely with 24.00 mL of .900 M HCl?
1. 2 answers
2. 726 views
A solution of ethanol (C2H5OH) in water is prepared by dissolving 57.0 mL of ethanol (density = 0.79 g/cm3) in enough water to
1. 2 answers
2. 956 views
A solution is prepared by dissolving 16.5 g ammonium sulfate in enough water to make 145.0 mL of stock solution. A 10.50 mL
1. 3 answers
2. 890 views
The units of parts per million (ppm) and parts per billion (ppb) are commonly used by environmental chemists. In general, 1 ppm
1. 4 answers
2. 1,386 views
A standard solution is prepared for the analysis of fluoxymesterone (C20H29FO3), an anabolic steroid. A stock solution is first
1. 2 answers
2. 771 views
What does Antony say Caesar's death symbolizes? Act 3-Scene 2
1. 2 answers
2. 747 views
hot-air balloon is filled with air at a volume of 3.64 x 10^3 m^3 at 745 torr at 39C. the air in balloon is heated to 60C,
1. 3 answers
2. 1,016 views
given the reaction -Fe(s)+H2SO4(aq)->FeSO4(aq) + H2(g) the volume of the balloon was 4400m^3 and the loss of hydrogen gas during
1. 2 answers
2. 832 views
compund containing only C, H, and N yeilds the following data-1. complete combustion of 34.3 mg of the compund producedmg of CO2
1. 1 answer
2. 452 views
C6H12O6(aq)->2 C2H5OH(aq) + 2CO2(g)Fermentation of 744mL grape juice(density=1.0 g/cm^3) is allowed to take place in a bottle
1. 3 answers
2. 1,006 views
75L stainless steel container was charged with 3 atm of hydrogen gas and 4 atm of oxygen gas. a spark ignited the misture,
1. 3 answers
2. 693 views
How can separate 1L samples of O2 and H2 have the same average velocity/
1. 3 answers
2. 539 views
using the van der Waals equation calculate the pressur exterted by .5160 mol N2 in a 1L container at 24.6C
1. 4 answers
2. 461 views
a 2.747g sample of manganese metal is reacted with excess HCl gas to produce 3.24L of H2 at 366K and .927atm and a manganese
1. 5 answers
2. 1,255 views
a 13.5L tank is filled with H2 to a pressure of 2x10^2atm. How many balloons (each 2L) can be inflated to a pressure of 1 atm
1. 3 answers
2. 1,010 views
consider separate 1Lsamples of He and UF6 both at 1 atm and containing the same number of moles. what ratio of temps for the two
1. 3 answers
2. 911 views
In 1897 the Swedish explorer Andree tried to reach the North Pole in a balloon. The balloon was filled with hydrogen gas. The
1. 6 answers
2. 1,406 views
given the reaction -Fe(s)+H2SO4(aq)->FeSO4(aq) + H2(g) the volume of the balloon was 4400m^3 and the loss of hydrogen gas during
1. 2 answers
2. 551 views
Use the data in Table 5.4 to calculate the partial pressure of He in dry air assuming that the total pressure is 1.0 atm.
1. 5 answers
2. 2,241 views
A spherical glass container of unknown volume contains helium gas at 25°C and 1.950 atm. When a portion of the helium is
1. 5 answers
2. 708 views
A spherical glass container of unknown volume contains helium gas at 25°C and 1.950 atm. When a portion of the helium is
1. 6 answers
2. 1,377 views
A piece of solid carbon dioxide, with a mass of 6.2 g, is placed in a 4.0 L otherwise empty container at 21°C.( a) What is the
1. 4 answers
2. 2,401 views
a) Calculate the pressure exerted by 0.5160 mol N2 in a 1.0000 L container at 24.6°C using the ideal gas law.atm (b) Calculate
1. 6 answers
2. 869 views
A spherical glass container of unknown volume contains helium gas at 25°C and 1.950 atm. When a portion of the helium is
1. 2 answers
2. 528 views
A 75.0 L stainless steel container was charged with 3.00 atm of hydrogen gas and 4.00 atm of oxygen gas. A spark ignited the
1. 3 answers
2. 897 views
can you help me with the ones you helped me with last nite? lower on page one i put my results i got down for you to see if i am
1. 1 answer
2. 361 views
what is the equation for calculating ÄE?here is my info- q=-39kJ, w=88kJ
1. 3 answers
2. 323 views
a system udergoes a process consisting of the following 2 steps-1. absorbs 79J of heat while 26J of work is done to it 2. system
1. 3 answers
2. 606 views
in the equation 2SO2 + O2 -> 2SO3how do you find if work done is >, <, or = to 0?
1. 2 answers
2. 698 views
consider a mixture of air and gasoline vapor in a piston. original V is 30cm^3. if the combustion of misture releases 985J
1. 5 answers
2. 615 views
how do I find the ÄH for C2H4 + O3 --> CH3CHO + O2?
1. 4 answers
2. 838 views
One mole of H2O(g) at 1.00 atm and 100.°C occupies a volume of 30.6 L. When one mole of H2O(g) is condensed to one mole of
1. 7 answers
2. 4,400 views
A balloon filled with 22.3 mol helium has a volume of 500. L at 0.0°C and 1.00 atm pressure. The temperature of the balloon is
1. 2 answers
2. 854 views
The specific heat capacity of silver is 0.24 J/°C·g.(a) Calculate the energy required to raise the temperature of 140.0 g Ag
1. 7 answers
2. 2,334 views
On Easter Sunday, April 23, 1983, nitric acid spilled from a tank car near downtown Denver, Colorado. The spill was neutralized
1. 2 answers
2. 2,250 views
2 HNO3(aq) + Na2CO3(s) 2 NaNO3(aq) + H2O(l) + CO2(g)(a) Calculate H° for this reaction. kJ
1. 4 answers
2. 1,493 views
A balloon filled with 22.3 mol helium has a volume of 500. L at 0.0°C and 1.00 atm pressure. The temperature of the balloon is
1. 3 answers
2. 945 views
Combustion reactions involve reacting a substance with oxygen. When compounds containing carbon and hydrogen are combusted,
1. 3 answers
2. 3,468 views
Consider the following reaction.2 HCl(aq) + Ba(OH)2(aq) BaCl2(aq) + 2 H2O(l) H = -118 kJ Calculate the heat when 112.4 mL of
1. 3 answers
2. 828 views
2 HCl(aq) + Ba(OH)2(aq) BaCl2(aq) + 2 H2O(l)H = -118 kJ Calculate the heat when 112.4 mL of 0.500 M HCl is mixed with 300.0 mL
1. 10 answers
2. 1,153 views
You are given the following data.P4(s) + 6 Cl2(g) 4 PCl3(g) H = -1225.6 kJ P4(s) + 5 O2(g) P4O10(s) H = -2967.3 kJ PCl3(g) +
1. 7 answers
2. 3,667 views
Consider the following cyclic process carried out in two steps on a gas.Step 1: 48 J of heat is added to the gas, and 20. J of
1. 2 answers
2. 768 views
answer the following questions assuming that m (subscript s) could have three values rather than two and the rules for n, l and
1. 4 answers
2. 870 views
calculate the change in energy expected for each of the following processes1. Rb(g) + Br(g) --> Rb+ (g) + Br- (g) 2. Mg(g) +
1. 2 answers
2. 1,172 views
calculate the max wavelength of light capable of removing an electron for a hydrogen atom from the energy state characterized by
1. 3 answers
2. 2,724 views
what is the energy of a mole of UV photons having a wavelength of 13nm?
1. 1 answer
2. 427 views
Using data from this chapter, calculate the change in energy expected for each of the following processesRb(g) + Br(g) Rb+(g) +
1. 3 answers
2. 739 views
Simplify (x+1)(x2+x-1) that should be x squared. the superscript didn't carry over.
1. 3 answers
2. 409 views
Find an equation with the given form in each case below.y=sinè through(ð/2, 0)
1. 4 answers
2. 334 views
the points a, b, c, d, e, f, g are equally spaced along a line. Name a vestor which is equal to 3BD
1. 2 answers
2. 527 views
find the resultant of each pair of forces acting on an objecta) forces of 7N east and 12N west b) forces of 7N east and 12N
1. 3 answers
2. 619 views
a man weighiing 7-kg lies in a hammock whose ropes make angles of 20 and 25 degrees with the horizontal. What is the tension in
1. 4 answers
2. 1,073 views
what is 1+1 equal
1. 3 answers
2. 430 views
Delta airline flights seats 340 people. An average of 5% of the people with reservations doesnt show up, so they overbook by
1. 3 answers
2. 619 views
water depletion in the netherlands
1. 1 answer
2. 318 views
why is farming so important?
1. 1 answer
2. 285 views
what does the approach hypothesis driven science usually start with?
1. 1 answer
2. 341 views
what is the metal ion formula forBaCL2 (times) 2H2O
1. 3 answers
2. 519 views
Naclwhat is the metal ion formuala and non metal formula
1. 1 answer
2. 465 views
"most men lead lives of silent "what does that quotes mean to you write 5-7 sentences
1. 7 answers
2. 489 views
what would cause scientists t change the current model of an atom
1. 3 answers
2. 458 views
give the etymology of the root word : BIO and where it is derived from and the definition
1. 4 answers
2. 1,497 views
what are two higher level words for the root word: BIO
1. 1 answer
2. 437 views
Charlie wants to buy a $900 TV in 9 months. How much should he invest now at 17% simple interest to have the money in 9 months?
1. 2 answers
2. 520 views
can you give me a good sentence using the word biologyand biography
1. 7 answers
2. 527 views
whats a sentence using periodically
1. 1 answer
2. 317 views
where can i find free SAT problems and ACT problems
1. 1 answer
2. 451 views
can you give me sites that are all about aquaphobiai can't find any good ones
1. 4 answers
2. 345 views
caculate the number of moles in 8200 g of iron
1. 6 answers
2. 1,211 views
notation for subsequesnt multiple authors in a citation
1. 1 answer
2. 599 views
water vapor and nitrogen dioxide gas NO2 are cimbined to manufacture ammonia. a by product of this reaction is oxygen gas. write
1. 3 answers
2. 1,069 views
2cr(s) + SnCL4(aq) -->can this reaction occur if so write the balanced equation if it doesnt explain why
1. 5 answers
2. 2,513 views
what is the primary focus of the nonintervention perspective
1. 1 answer
2. 487 views
a ramp is 0.5m high and has a slope of 4m long.what is the mechanical advantage?
1. 5 answers
2. 1,077 views
a person accused of a crime does not have the right toa speedy trial] b a presidential pardon] c the assistance of counsel for
1. 1 answer
2. 442 views
A brick is thrown upward from the top of a building at an angle of 10° to the horizontal and with an initial speed of 11 m/s.
1. 3 answers
2. 579 views
A fireman 46.0 m away from a burning building directs a stream of water from a ground-level fire hose at an angle of 30.0°
1. 3 answers
2. 754 views
A tennis player standing 11.0 m from the net hits the ball at 3.34° above the horizontal. To clear the net, the ball must rise
1. 1 answer
2. 405 views
i really need to know about gases if anyone's got any ifo please tell me!! Tar mel xx
1. 4 answers
2. 170 views
A football punter accelerates a football from rest to a speed of 8 m/s during the time in which his toe is in contact with the
1. 3 answers
2. 548 views
A bag of sugar weighs 6.00 lb on Earth. What would it weigh in newtons on the Moon, where the free-fall acceleration is
1. 3 answers
2. 2,249 views
how do i evaluate using formulas? i did almost the entire thing, but i can't finish the problem because i don't know how to
1. 1 answer
2. 432 views
7/13 divided by 3/4
1. 1 answer
2. 397 views
how many square cards of side 5cm can you cut from a rectangular sheet of paper of length 200cm and width 10cm?
1. 2 answers
2. 633 views
- radical 2 belongs to which groupsirration , real,rational
1. 1 answer
2. 334 views
what is R^0 R^8 equal
1. 1 answer
2. 335 views

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