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Ok, so in an when an endothermic reaction occurs, is it hot or cold? and why? Also what is it for an exothermic reaction? Thank
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2. 403 views
If you add a metal piece to excess acid, what of listed factors below will increase, decrease, or have no impact on how fast a
1. 3 answers
2. 670 views
Explain how dispersion forces, dipole-dipole forces, and hydrogen bonds (intermolecular forces) affect the 2 states of matter
1. 1 answer
2. 632 views
How many oxygen atoms are ina) 3.21 x 10^22 molecules CH3OH b) .250 mol C6H12O6 Is it a) 3.21 x 10^22 atoms b) 9.03 x 10^23
1. 2 answers
2. 1,885 views
A bracelet containing .200 mol of metal atoms is 75% gold. How many particles of gold atoms are in the bracelet?
1. 1 answer
2. 1,278 views
What are the Oxidation and Reducation reactions for these equations :BaCl2 + NaHCO3 -> BaCO3 + NaCl + HCl (carbon is the
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2. 745 views
Ok, so when you are solving an equation, and you have an answer such as5x=0 , does that mean that it is no solution or all real
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2. 582 views
Pipette 3 drops of oil into a test tube of water and shake. Describe what takes place and why?- Would it be the oil settles at
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2. 540 views
How do you calculate deltaHf using the # of moles from a balanced equation?How do you connect the Law of Conservation of Energy
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2. 543 views
What exactly is the war going on between the U.S. and Pakistan? Is it because the U.S. though Bin Laden was in Pakistan? Also is
1. 1 answer
2. 478 views
Is fiscal policy the same thing as a fiscal cliff? If not, then how do they differ? Also what are some important policies in
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2. 438 views
What policies affected the citizens during the 21st century?For example: In the U.S. we had the Homeland Security Policy
1. 4 answers
2. 350 views
I'm having a little trouble determining oxidation numbers for elements in a redox reactionKMnO4+HCl--> MnCl2+Cl2+H2O+KCl So far
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2. 581 views
If 8.72 grams of oxalic acid, H2C2O4, a diprotic acid, is neutralized when 23.4 mL of a solution of KOH is added, what is the
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2. 604 views
how do i predict a conjugate a base?Ex: HBr. The conjugate base is Br- a. NH4+ b. H2O c. H2PO4
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2. 581 views
What do stage directions tell the reader?Do they tell about characterization or about the setting?
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2. 501 views
ER promises you will be seen in 10 minutes. the standard deviation is 2 minutes. chance someone will wait more than 13 minutes.i
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2. 353 views
average for all football teams was an 86 with variance of 16. the buckeyes program over the last 16 year was a 93. is there
1. 1 answer
2. 390 views
What is the surface area and lateral area of a regular triangular pyramid if the slant is 7 and the altitude is 5?
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2. 461 views
Pure water has a density of 1.00 g/ml at 297 . Calculate the molar concentration of pure water at this temperature. Would i just
1. 1 answer
2. 999 views
H2 + CO2 <--> H2O + COif there were something that were added to this system to absorb the CO2, where would the equilibrium
1. 3 answers
2. 459 views
NaCl(s) + H2O(l) <--> Na(aq) + Cl(aq)If you added chloride ions to the above equilibrium, what would happen to the concentration
1. 4 answers
2. 1,747 views
For the reaction CO2 + H2 <--> CO + H20 + heat, indicate how the change in condition will shift the equilibrium (ie right or
1. 1 answer
2. 1,138 views
At a certain temperature, the concentrations of NO and NH3 are equal, and the concentration of H2o and o2 are 2.0M and 3.0M
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2. 489 views
On Easter Sunday, April 23, 1983, nitric acid (HNO3) spilled from a tank car near downtown Denver, Colorado. The spill was
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2. 1,321 views
If you multiply 100!*200!*300!, how many 0s are there?
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2. 287 views
In procedure B2, you will titrate a saturated solution to find out how much of the anion dissolved. Assume you we're able to
1. 2 answers
2. 884 views
Sodium azide (NaN3) yields N2 gas when heated to 300 degrees Celsius , a reaction used in automobile airbags. If 1.00 mol of N2
1. 1 answer
2. 2,179 views
Commodity prices of NaCl and urea are about $0.033/lb for NaCl (as rock salt) and about $0.10/lb for urea. Calculate the cost of
1. 2 answers
2. 1,167 views
why is the formation of a condensation polymer impossible in these cases ?A) ethanoic acid + NH2CH2CH2CH2CH2NH2 B) ethanoic
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2. 444 views
I am having trouble on this please helpIndicate which of these statements is true? For those that are false,.explain why a)
1. 1 answer
2. 682 views
why is the formation of a condensation polymer impossible in these cases ?A) ethanoic acid + NH2CH2CH2CH2CH2NH2 B) ethanoic
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2. 441 views
Commodity prices of NaCl and urea are about $0.033/lb for NaCl (as rock salt) and about $0.10/lb for urea. Calculate the cost of
1. 0 answers
2. 523 views
I am having trouble on this please helpIndicate which of these statements is true? For those that are false,.explain why a)
1. 0 answers
2. 516 views
Commodity prices of NaCl and urea are about $0.033/lb for NaCl (as rock salt) and about $0.10/lb for urea. Calculate the cost of
1. 1 answer
2. 496 views
I have o.236 g for urea and 0.235g for NaCl.And the question is On a gram basis, which is more effective in depressing the
1. 8 answers
2. 1,043 views
I need to calcuted the molarity from this12.5 g of ethylene glycol antifreeze dissolved in o.100kg of water. Density of solution
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2. 682 views
three bowls are filled to a depth of four units. a paraboloid, z=x^2 +y^2 for 0<z<4, a cone z=(x^2 + y^2)^(1/2) for 0<z<4, and a
1. 1 answer
2. 3,076 views
The perimeter of the office bulletin board is 24 ft. The perimeter of the sandbox is 1 1/2 times as long. What is the perimeter
1. 1 answer
2. 871 views
A spaceship of mass 2.3×10^6 kg is cruising at a speed of 6.0×10^6 m/s when the antimatter reactor fails, blowing the ship
1. 1 answer
2. 1,232 views
A 1.1 kg block slides along a friction-less surface at 1.4 m/s. A second block, sliding at a faster 4.3 m/s, collides with the
1. 0 answers
2. 492 views
A 9.6 kg dog takes a nap in a canoe and wakes up to find the canoe has drifted out onto the lake but now is stationary. He walks
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2. 910 views
A 9.6 kg dog takes a nap in a canoe and wakes up to find the canoe has drifted out onto the lake but now is stationary. He walks
1. 0 answers
2. 720 views
an object has a charge of -2.0 microcoloumbs, how many electrons must be removed so that the charge becomes +3.0 microcoloumbs?I
1. 0 answers
2. 1,032 views
Why did different regions in Africa develop in different ways between 1000 and 1700?
1. 1 answer
2. 499 views
1. All of the following are among the Pillars of Islam except.A. performing daily prayers. B. memorizing the Koran. C. giving to
1. 1 answer
2. 800 views
Give the component form of the resultant vector in the following.u = (10, 5) -3u = ?
1. 0 answers
2. 488 views
Given:f(x)=2x^2-x+1 g(x)=2 sin x h(x)=3^x Determine: a) f(g(x)) b) (h^-1 o f)(x) c) g(f(h(x)))) Please show steps, thank you
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2. 305 views
A Hindu society in Southeast Asia that resisted both Buddhism and Islam was
1. 2 answers
2. 916 views
Find the limit.lim h → 0 square root (49 + h) − 7 / h Note: Only 49 +h are under square root.
1. 2 answers
2. 1,273 views
what is the inverse function of f(x)=-[sqrt(25-x^2]
1. 1 answer
2. 622 views
A race driver has made a pit stop to refuel. After refueling, he starts from rest and leaves the pit area with an acceleration
1. 0 answers
2. 523 views
A jetliner, traveling northward, is landing with a speed of 66.5 m/s. Once the jet touches down, it has 766 m of runway in which
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2. 477 views
In getting ready to slam-dunk the ball, a basketball player starts from rest and sprints to a speed of 11.1 m/s in 2.30 s.
1. 0 answers
2. 515 views
A race driver has made a pit stop to refuel. After refueling, he starts from rest and leaves the pit area with an acceleration
1. 0 answers
2. 639 views
a 1.29 kg ball is connected by means of two massless strings to a vertical, rotating rod. The strings are tied to the rod and
1. 3 answers
2. 1,122 views
In this problem, x cubed = 12y...how do you solve to determine if this is direction variation or not?
1. 1 answer
2. 385 views
A plumber must bend a piece of tubing twice, allowing 5/8 inch for each bend. use the total of 12 1/2, 16 3/4, and 18 3/4. To
1. 2 answers
2. 435 views
In a large hotel, a fast elevator takes you from the ground floor to the 21st floor. The elevator takes 17 s for this trip: 5 s
1. 1 answer
2. 1,433 views
foofy computes the correlation between an individual's physical strength and his or her college grade poing average. Using a
1. 1 answer
2. 1,119 views
The following standard free energies are given for 25 degrees celcius.1) N2(g) + 3H2(g)-> 2NH3(g) delta g = -33.0 kJ 2) 4NH3(g)
1. 0 answers
2. 785 views
Heights of fences are normally distributed with a mean of 52 inches and a standard deviation of 4 inches. Find the probability
1. 1 answer
2. 1,126 views
((AN ERA OF LIMITS 1969-1980))How were the relations between the United States and the Soviet Union different during this era?
1. 0 answers
2. 676 views
why did the anti-war protest hurt the united states during the Vietnam war?
1. 5 answers
2. 668 views
How many mL of concentrated HCl(aq) (36% HCL by mass, d=1.18g/mL_ are required to produce 12.5 L of a solution with ph = 2.10?Fi
1. 2 answers
2. 2,060 views
What is [H30+] in a solution obtained by dissolving 205mL HCl(g), measured at 23 C and 751mmHg, in 4.25L of aqueous solution?
1. 2 answers
2. 844 views
You receive an invoice for $565.00 with terms 3/10, net 30. If you pay it immediately, how much will you pay?A. $548.05 B.
1. 3 answers
2. 1,859 views
0.100 mol of SO2 and 0.100 mol of O2 are introduced in a flask of 1.52 L. When in equilibrium, 203 is found to be 0.0916 mol.
1. 5 answers
2. 930 views
Given the equationNO(g) + 1/2)O^2(g) <-> NO(g) at 457 Kelvin with a K = 7.5 x 10^2 Find the K value for the equation 2NO^2(g)
1. 4 answers
2. 498 views
Given the equation2H^2S(g) <-> 2H^2(g) + S^2(g) With a Kp = 1.2x10^-2 at 1338 Kelvin Find the value of Kc for the reaction
1. 6 answers
2. 890 views
HCONH2(g) <-> NH3(g) + CO2(g) Kc= 4.84 at 400 K2(g)If 0.186 mol of HCONH2(g) dissciates in 2.16L at 400K, what will be the total
1. 8 answers
2. 1,143 views
Starting with 0.3500mol Co(g) and 0.05500mol COCL2(g) in a 3.050 L flask at 668K, how many moles of Cl2 are present at
1. 4 answers
2. 2,582 views
Determine Kc for the following reaction:1/2N2(g) + 1/2O2(g)+ 1/2Br(g) <-> NOBr(g) from the following information (at 298K)
1. 2 answers
2. 3,528 views
The Hydrolysis Reactions - Write net-ionic equations for the reaction of each salt with water below. If there is no reaction,
1. 1 answer
2. 13,551 views
Titration of an Unknown Acid...What effect on the molar mass of the unknown acid would each of the following have... Would it
1. 1 answer
2. 2,587 views
Would it be better to use an unknown acid sample of a size that should require 10.00 milliliters or one that would require 15.00
1. 1 answer
2. 1,491 views
Why is it important to swirl the NaOH solution each time before using it during a titration?
1. 2 answers
2. 808 views
Two electrostatic point charges of +30 ìC and +25 ìC exert a repulsive force of 200 N on each other. What is the distance
1. 0 answers
2. 783 views
A right square pyramid’s base has edges measuring 20 feet each. Ifthe pyramid’s height is 27 feet, what is its volume, in
1. 1 answer
2. 1,611 views
The freezing point of a cyclohexane sample is 6.20*C. A soltuion is prepared by dissolving 0.4660g of an unknown solute in 36.0g
1. 1 answer
2. 2,353 views
What are 3 possible reasons why a percentage recovery might be low? And what are 3 possible reasons why a percentage recovery
1. 1 answer
2. 712 views
Iron is obtained from iron ore according to the following reaction: Fe2O3+CO---> Fe+CO2 (unbalanced).a. Assuming the blast
1. 3 answers
2. 1,902 views
How many milliliters of 3.0 M NaOH are required to react with 0.50g of Cu2+ to form Cu(OH)2?
1. 1 answer
2. 1,267 views
How many milliliters of 3.0 M NaOH are required to react with 4.0mL of 16.0 M HNO3? ---> Not sure if I am solving correctly but
1. 1 answer
2. 2,074 views
Hi all.I'm trying to write a paragraph in french. These are my instructions: Décrivez vos activités habituelles pendant les
1. 3 answers
2. 663 views
A 0.188g sample of unknown metal, X (s), produced 71.4 ml of hydrogen gas when reacted with HCL according to the equation:
1. 2 answers
2. 1,179 views
A 0.0677g sample of magnesium metal reacted with excess hydrochloric acid to produce 69.9 ml of hydrogen gas. The gas was
1. 2 answers
2. 2,544 views
A sample of oxygen gas is collected by displacing water from an inverted bottle as shown in the diagram below. The volume of
1. 0 answers
2. 873 views
CaO(s) reacts with SO2(g) according to the following equations: CaO9(s)+So2(g)--> CaSO3(g).A 8.85g mixture containing CaO(s) is
1. 0 answers
2. 810 views
Consider the flasks diagrammed below. What is the total pressure in torr after the stopcock between the two flasks is opened?
1. 1 answer
2. 1,376 views
A steel cylinder contains 98.0 moles of oxygen gas at temperature of 38 degree Celsius and a pressure of 740 torr. After some of
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2. 966 views
A compound contains only hydrogen and nitrogen and is 12.6% hydrogen by mass. A gaseous sample of the compound has density of
1. 0 answers
2. 944 views
The graphs of y= x^2 - 8x - 35 andy= -2(x^2) + 16x +3 intersect in two points. What is the sum of the x-coordinates of the two
1. 1 answer
2. 541 views
How many non-congruent triangles with only integer side legnths have a perimeter of 15 units?
1. 4 answers
2. 2,247 views
There is a 4 x 4 square grid. Two unit squares are chosen from the 16 unit squares possible. What is the probability that they
1. 0 answers
2. 1,127 views
There is a 4 x 4 square grid. Two unit squares are chosen from the 16 unit squares possible. What is the probability that they
1. 0 answers
2. 580 views
When x^2-5x+3c is divided by x-3 the remainder is -12. What is the value of c?
1. 0 answers
2. 920 views
How many unit cubes would it take to construct the complete exterior of a hollow cube with edges of 4 units and faces 1 unit
1. 4 answers
2. 1,501 views
Concentrated sulfuric acid is 18.4 molar and has a density of 1.84 grams per milliliter. After dilution with water to 5.20 molar
1. 1 answer
2. 1,699 views
The grams of oxygen that would produce 13.4 g Cl^2O^7 molecules.
1. 2 answers
2. 376 views

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