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danny

Questions (285)

In which of the following reactions is ΔE closest in value to ΔH?HNO3(aq) + Na2(CO3)(aq) = NaNO3(aq) + H2O(l) + CO2(g)
1. 1 answer
2. 729 views
If the breakdown half-life of a pesticide applied to a farmer’s field is 3.50 days, then what is the rate constant for this
1. 1 answer
2. 491 views
Ethylene gas (C2H2) can be formed from the reaction of calcium carbide (CaC2) with water. What is the reaction rate if 14.2
1. 1 answer
2. 665 views
Calculate the change in Gibb’s free energy when 1.63 moles of sodium metal react with excess chlorine gas to form sodium
1. 1 answer
2. 566 views
White phosphorus (P4) was used for a long time in military incendiary bombs and ordnances. White phosphorus reacts with oxygen
1. 1 answer
2. 636 views
Calculate the change in free energy when you drop 4.70 g of calcium metal into a beaker containing excess water so that
1. 1 answer
2. 455 views
Which of the following processes is entropy increasing in the local system? You may select multiple processes.Combination
1. 1 answer
2. 710 views
Which of the following reactions will be spontaneous at standard state? Not all the reactions are balanced, so make sure they
1. 1 answer
2. 737 views
ΔS is positive for which one of the following reactions?Ag+(aq) + Cl- (aq) = AgCl(s) N2(g) + 3H2(g) = 2NH3(g) CaO(s) + CO2(g) =
1. 1 answer
2. 704 views
Suppose you have a reaction that has a ΔH of +80 kJ and a ΔS of 215 J/K. At what temperature will this reaction change from
1. 1 answer
2. 451 views
Given the following values of ΔH, ΔS and T, calculate ΔG (in kJ). The values are: ΔH = 23.0 kJ, ΔS = 125 J/K, and
1. 1 answer
2. 430 views
Given the following values of ΔH, ΔS and T, calculate ΔG (in kJ). The values are: ΔH = -95.0 kJ, ΔS = 217 J/K, and
1. 1 answer
2. 444 views
How many core electrons are there in a ground state phosphorus atom?
1. 1 answer
2. 630 views
Given:Equation #1: 4NH3(g) + 5O2(g) = 4NO(g) + 6H2O; ΔH of reaction = -1170 kJ Equation #2: 4NH3(g) + 3O2(g) = 2N2(g) + 6H2O;
1. 2 answers
2. 2,717 views
Calcium carbide (CaC2) reacts with water to form acetylene (C2H2) gas and calcium hydroxide (Ca(OH)2). If the ΔH for:CaC2(s) +
1. 1 answer
2. 2,265 views
Suppose that your morning shower is 7 minutes long and uses 4 gallons of water per minute that is a nice 102 F in temperature.
1. 1 answer
2. 659 views
Suppose you add 92 ml of dilute acid to 46 ml of water. Both the water and acid were at room temperature (22 C) before being
1. 1 answer
2. 552 views
In the reaction below, ΔH°f is zero for ___________.Ni(s) + 2CO(g) + 2PF3(g) = Ni(CO)2(PF3)2(l) Ni(s) CO(g) Ni(CO)2(PF3)2(l)
1. 1 answer
2. 11,034 views
The enthalpy change for the following reaction is -483.6 kJ:2H2(g) + O2(g) = 2H2O(g) Therefore, the enthalpy change for the
1. 1 answer
2. 3,035 views
What is the specific heat capacity of ethanol (C 2H 6O) if a 18.3 g sample increased 12.3 C upon the addition of 553.0 J? The
1. 1 answer
2. 552 views
The radiator in your car uses either water or ethylene glycol (anti-freeze) to remove heat from the engine and dissipate it to
1. 1 answer
2. 674 views
What is the specific heat capacity of aluminum if a 8.4 g sample increased 21.1 C upon the addition of 159.0 J? The units are
1. 1 answer
2. 446 views
What is the specific heat capacity of aluminum if a 8.4 g sample increased 21.1 C upon the addition of 159.0 J? The units are
1. 1 answer
2. 523 views
The value for ΔH° for the reaction below is -72 kJ. How many kJ of heat are released when 1.0 mol of HBr is formed in this
1. 1 answer
2. 1,614 views
What is the mass of 5.00L of pure water?
1. 1 answer
2. 1,691 views
A typical multivitamin tablet can contain 2.00mg of vitamin B2 (riboflavin), and the RDA is 0.0030 g/day. How many such tablets
1. 1 answer
2. 1,792 views
The thermite reaction demonstrated in class requires high temperatures to start the reaction. A simple open flame is not enough
1. 2 answers
2. 802 views
A 36.0 g piece of copper at 130.0 C is placed in 50.0 g of water at 20.0 C. What is the temperature (in C) of the water once the
1. 2 answers
2. 544 views
The radiator in your car uses either water or ethylene glycol (anti-freeze) to remove heat from the engine and dissipate it to
1. 3 answers
2. 715 views
If you burn 13.7 g of methane (CH4) burns in oxygen, then 686 kJ is evolved. What is the amount of heat produced per mole of
1. 3 answers
2. 789 views
Suppose you mix hydrogen, CCl4, CO2, NO2 and fluorine gases together and allow them to reach an equilibrium temperature. Which
1. 1 answer
2. 423 views
What role does the lilac flower play in its natural ecosystem? What is its niche in the food webAre there any ecological issues
1. 1 answer
2. 801 views
What is the purpose of the resonator stringed instrument
1. 4 answers
2. 578 views
What is the final concentration of 35.7mL of 52.0% m/m solution that is diluted to 65.9ml?i am not sure how to caluclate this...
1. 1 answer
2. 433 views
What is the mass of 4.3× 10 to the power of15 atoms of nickel (Ni)?
1. 1 answer
2. 491 views
Why is it important to make sure that the volume of water and the startingtemperature are the same in each trial ?
1. 1 answer
2. 522 views
a uniform (in density and shape) stick is balanced by one end on the ground and the other tied to a massless horizontal rope
1. 0 answers
2. 1,067 views
Rubbing your hands together warms them by converting work into thermal energy. If a woman rubs her hands back and forth for a
1. 0 answers
2. 552 views
A steel tube has an outside diameter of 15 cm, an inside diameter of 13 cm,and is 3.7 m long.What is the volume of the steel
1. 2 answers
2. 3,070 views
An open box is made from a square piece of cardboard 20 inches on a side by cutting identical squares from the corners and
1. 2 answers
2. 4,387 views
A delicatessen serves 10 kinds of sandwiches and 5 kinds of chips. How many different sandwich and chip lunches can they make if
1. 0 answers
2. 459 views
Solve the problem.A collection of dimes is arranged in a triangular array with 14 coins in the base row, 13 in the next, 12 in
1. 0 answers
2. 458 views
If the answer is an amount of money, round to the nearest dollar.Maria has saved $420 at a bank. She wants to accumulate $1250
1. 1 answer
2. 376 views
What is the angle sum of a regular polygon with 7 sides
1. 1 answer
2. 699 views
make a tally and a frequency table for the number of books read by students during the summer: 4, 5, 7, 2, 4, 5, 6, 7, 8, 4, 5,
1. 0 answers
2. 440 views
Attach 6 trapezoids to one hexagon for each figureFigure 1: One line of symmetry and no rotational symmetries (other than 360
1. 0 answers
2. 526 views
find given the funcrion k described by k(x) =12x, find each of the following (a) k(-19),(b0 K (10)(c) k(21),k(-19)=
1. 1 answer
2. 303 views
Can someone check gammar, punctuatiion and structure please.Draft an email of at least four complete sentences to Deb Walker the
1. 1 answer
2. 502 views
Draft an email of at least four complete sentences to Deb Walker the designated trainer:Confirm the arrangements for the seminar
1. 5 answers
2. 820 views
Assume that you’ve worked for the last five years as anadministrative assistant for the Human Resources Department of
1. 5 answers
2. 1,909 views
Assume that you’ve worked for the last five years as anadministrative assistant for the Human Resources Department of
1. 1 answer
2. 693 views
Assume that you’ve worked for the last five years as anadministrative assistant for the Human Resources Department of
1. 3 answers
2. 600 views
Assume that you’ve worked for the last five years as anadministrative assistant for the Human Resources Department of
1. 5 answers
2. 2,350 views
The figure is taken from a paper (Am J Sports Med 2004 32: 477) on injuries to the anterior cruciate ligament due to forces
1. 1 answer
2. 516 views
so i suppose to find slope.i have trouble this problem. my math book is not really clear. Find the slope of the tangent line to
1. 2 answers
2. 598 views
1. 8sin(cos(x^6)), find f'(x)2. cos(sin(x^2)), find f'(x).
1. 2 answers
2. 350 views
If f(x)=sin^5x, Find f'(x)i don't know im doing right way f'(x)= 5cosx * sin(x)
1. 3 answers
2. 383 views
Write the composite function in the form f(g(x)). [Identify the inner function u=g(x) and the outer function y=f(u).] Then find
1. 1 answer
2. 3,363 views
If f(x)=(4x+8)^-2, Find f'(x)
1. 3 answers
2. 257 views
United States citizens living in Switzerland must pay taxes on their income to both the United States and to Switzerland.
1. 0 answers
2. 928 views
can someone help me simplify 3/4i
1. 0 answers
2. 267 views
Which of the following is the solution to the matrix equation below?[0 9 2] [18] [3 2 1] x=[5] [1 -1 0] [-1] a) [-3 -2 18] b)
1. 0 answers
2. 1,003 views
Use (Triangle) PQR with coordinates P(2, –1), Q(0, 5), and R(–2, 0).Which matrix expression can be used to translate
1. 1 answer
2. 635 views
Renter’s Insurance protects a person who is renting an apartment from losses or damages that can occur in the apartment
1. 3 answers
2. 563 views
x^2+6x=24
1. 2 answers
2. 362 views
Sam's plasma tv has a 14inby18in screen and border. The total area of the tv 480inch^2. How wide is the trim
1. 1 answer
2. 391 views
A variable-speed drill, initially turning at 500 rpm, speeds up to 1300 rpm in a time interval of 0.8 s. What is its average
1. 1 answer
2. 807 views
Yard saleAll items priced from .50-2.50 Median Price 2.10 Median Price 1.80
1. 1 answer
2. 413 views
Elisa need to pick a numerical password that contains 4 digits using the numbers 0-9 If none of the digits can be repeated, how
1. 2 answers
2. 483 views
In the past a certain college has found that 35% of the students will grad within 4 years. A random sample of 450 students at
1. 0 answers
2. 639 views
a handful of coins is worth $1.50. there are a total of 54 pennies and quartes in the hand
1. 0 answers
2. 749 views
a farmer raises chickens and cows. there are 34 animals in all. the farmer counts 110 legs total on these animals. how many
1. 4 answers
2. 5,406 views
is a line graph a table?
1. 0 answers
2. 295 views
The only defined term of those listed is:line angle plane point
1. 1 answer
2. 3,342 views
All diagonals from a single vertex of a hexagon are drawn. Four triangles will result.True False true?
1. 2 answers
2. 1,278 views
An isometry preserves distance.True False true?
1. 4 answers
2. 1,357 views
A square has symmetry with respect to a line containing a median of the square.True False true?
1. 0 answers
2. 583 views
Two similar polygons have areas of 16 square inches and 64 square inches. The ratio of a pair of corresponding sides is 1/4.True
1. 2 answers
2. 2,036 views
If the radius of this cylinder is doubled, its volume will betwice as much four times as much eight times as much is it four
1. 3 answers
2. 1,659 views
A sphere is inscribed in a cylinder. The surface area of the sphere and the lateral area of the cylinder are equal.true?
1. 1 answer
2. 686 views
mathematical relationship between period and frequency
1. 2 answers
2. 542 views
how do u find the diameter when they only give u the circumference?
1. 1 answer
2. 321 views
owen has a 4in x 6 in photo. he wants to get the photo enlarged to an 8in x 10 in size. find the scale factor
1. 1 answer
2. 545 views
how do u find the volume of a prism,when each side 12?
1. 1 answer
2. 326 views
Find the volume of the prism.whats the formula i would use?
1. 1 answer
2. 518 views
Find the lateral area for the prism.what formula do i us for this?
1. 1 answer
2. 504 views
Find the exact circumference of a circle with diameter equal to 8 ft.8 ft. 16 ft. 64 ft. what equation would u use?
1. 3 answers
2. 1,234 views
Find the exact area of a circle having the given circumferenceWhat formual would i use for that?
1. 2 answers
2. 606 views
whats the formula for finding the radius when givin the circumference?
1. 1 answer
2. 442 views
Find the radius of a circle with the given circumference.8.4 in. r = 3 in. 3�ã2 in. 6 in. 12�ã2 in. is it 6 in?
1. 1 answer
2. 426 views
Determine whether ∆H is equal to, greater than, or less than ∆U for the following reactions. Keep inmind that “greater
1. 0 answers
2. 1,116 views
When chords intersect in a circle, the vertical angles formed intercept congruent arcs.always sometimes never
1. 1 answer
2. 2,054 views
why did the united states seek to become a world power in the 1890'S?
1. 2 answers
2. 605 views
By the end of the eighteenth century, the British public preferred the high moral ground embraced by dramatists to the more
1. 1 answer
2. 984 views
What type of literary or dramatic works did William Shakespeare write?burlesque pantomime satire Restoration comedy heroic drama
1. 2 answers
2. 2,254 views
what is dramatic irony?
1. 1 answer
2. 382 views
What kind of plays did Euripides write?allegories tragedies comedies miracle plays mystery plays morality play
1. 2 answers
2. 900 views
multiple selectSelect all of the items that are true about a sample of water vapor at 101°C as it cools. 1) Its temperature
1. 2 answers
2. 1,992 views
whats the plot sturcture?
1. 2 answers
2. 408 views
Poetry that is not artistic in form or meaning is didactic.
1. 6 answers
2. 673 views

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