07/24/23

Hess Law Problem 2
Consider the following reactions:C(s) + 2H2O(g) --> CO2(g) + 2H2(g) Enthalpy = +163.0 kJ/moleC(s) + ½O2(g) ---> CO(g) Enthalpy = -121.0 kJ/moleH2O(g) ---> H2O(l) Enthalpy = -40.7... more
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07/24/23

If an elliptic race track is 100 yards long and 20 yards wide, then how far apart are the foci?
a. b. c. d. 
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07/24/23

Determine the value of a in order for Kc to be the same value as Kp. aA(g) + 2B(g) ←→ 3C(s) + 5D(g)
Answer choices654None of the above2
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07/23/23

Statistics from Sciences: Probability

During the Manhattan Project, the physicist Enrico Fermi asked Leslie R. Groves, the general in charge, "how do you define a 'great general'?" General Groves replied, "any great general who wins... more
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07/23/23

How does refraction really make light travel faster?
Please explain me in simple terms how refraction of light really makes it faster. My teacher told me that think of refraction in glass as: "Glass being a muddy path, the ray of light as you and air... more
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07/23/23

How many liters of a 50% antifreeze solution must be mixed with 6 liters of a 75% antifreeze solutions to make a mixture that is 60% antifreeze
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07/22/23

Algebraic equation involving unknown

Here's an equation: x4+y4+z4=14. Can you solve for x, y, and z?
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07/22/23

In the reaction of C5H12 + O2 = CO2 + H2O, the rate of formation of CO2 is 0.18 M/s. What is the rate of formation for C5H12 in M/s?

Answer choices: (Δ[O2])/Δt = 0.18(Δ[O2])/Δt = -0.036 (Δ[O2])/Δt = -0.216 None of the above (Δ[O2])/Δt = -0.288
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07/21/23

Percentage yield of carbon dioxide
When 19.4g of acetylene c2h2 is allowed to react with excess oxygen, 7.12g of CO2 are formed. What is the percentage yield of carbon dioxide?
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07/14/23

free body diagrams
The net force on a brick is 45 N [L]. There are 3 forces acting on the brick. Determine the value of F1 based on the following information. A free-body diagram may help.F1 = ?F2 = 85 N [L]F3 = 27 N... more
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07/13/23

URGENT what is the second derivative with respect to x and with respect to y of 2-ln[1+(x-2)^2+(y-2)^2]
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07/11/23

Use an algebraic equation to find the measures of the two angles.
Use an algebraic equation to find the measures of the two angles described below. Begin by letting x represent the degree measure of the​ angle's supplement.The measure of the angle is nineteen... more
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07/01/23

f(x)=x^7(x+8)^8
For -14<=x<=12 the function is defined by f(x)=x^7(x+8)^8 on which two intervals is the function increaseing , find the intervals which the function is positivie x= to x= where does the... more
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07/01/23

At the 1% significance level, can you conclude that the mean number of calories per scoop are different for these two brands of performance feed?
 A sample of 14 scoops of Brand I performance feed gave the mean number of calories of 156 per scoop  with a standard deviation of 38 calories. Another sample of 18 cans of Brand II performance... more
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06/28/23

what % of the area under the curve of the standard normal distribution is outside the interval z= [-0.86,0.86] (or beyond 0.86 standard deviations of the mean).
id specifically like to know how to put this into a calculator so I'm able to learn how to get the answer. Thank you!
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06/26/23

Find the speed and direction of the balls after collision.
A 1.5 kg ball moving at 2 m/s to the right collides head on with a 1kg ball moving at 3 m/s to the left. The coefficient of restitution is 0.7. Find the speed and direction of the balls after... more
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06/23/23

A man drives a car a distance of 20km at an average speed of 44kmhr^-1. what must be his average speed for the next 220km if he is to cover the total distance in 9hours?
To get the average speed i had to first get the T1( as totaltime= T1 + T2)....do i have to add the average speed(V1 + V2?)
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06/23/23

Consider the Parametric Equation
Consider the parametric equationx = 9(cos⁡(theta) + (theta)sin⁡(theta))y = 9(sin⁡(theta) − (theta)cos⁡(theta))What is the length of the curve for (theta) = 0 to (theta) = (11pi)/2?
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06/20/23

Please help, I don’t understand
Elsa has less than 40 apples. if she gave 5 apples to each of her friends, she will have 3 apples left. if she gave 7 apples to each of her friends, she will shorts of 2 apples. How many... more
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06/17/23

Can anybody solve the following A-level statistics question please? I can't see how to find the variance/standard deviation
Data collected over a long period of time indicate that 23% of children contract a certain disease. Following a public awareness campaign, a doctor conducts a survey to find out whether this... more
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06/14/23

Newton's method to approximate a root
use newtons law to approximate the root of 2x^7+3x^4+4=0 let x1=3 find second and third apporximation ofcarry atleast 4 decimal places in your calculations
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06/13/23

Precalc Polynomials

Two polynomials P and D are given. Use either synthetic or long division to divide P(x) by D(x), and express P in the form P(x) = D(x) · Q(x) + R(x).P(x) = x4 + 3x3 − 15x, D(x) = x − 4 ... more
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06/11/23

equilibrium problem- college level general inorganic 2

At a certain temperature, 0.4011 mol of N2 and 1.501 mol of H2 are placed in a 4.50 L container.N2(g)+3H2(g)↽−−⇀2NH3(g)At equilibrium, 0.1401 mol of N2 is present. Calculate the equilibrium... more
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06/10/23

Find the average rate of change for the following function over the interval from x = -4 to x = -2.
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06/10/23

Are there any books on learning general college chemistry that you would recommend?
Taking second college chemistry course beginning with Gases, Liquids, Solids, and Intermolecular Forces
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