03/20/20

What noble has atom has the same electron configuration as aluminum sulfide
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03/20/20

Find the area of a circle within a right angled triangle.
Hi, I’ve found this question on my school quiz but am really confused in how i should approach it and find the answer. In other words, I’m completely lost. A circle of unknown radius fits perfectly... more
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03/20/20

Find the Z scores that separate the middle 80% of the distribution from the area in the tales of the standard normal distribution
it doesn’t provide a mean or standard deviation
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03/19/20

Quadratic Function Application Question
A bridge forms a parabolic arch. The span of the arch is 60m and it’s center is 10m above either end. a) Write a quadratic function for this bridge. b) What is the height of the arch 15m from... more
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03/19/20

I need help on two questions!!! PLEASE HELP!
Calculate the ∆H for the following reaction: 2H2O2 🡪  2H2O   +  O2    You are given these two equations: 2H2  +  O2 🡪   2H2O  ∆H = -572 kJ H2  + O2 🡪 H2O2  ∆H = -188 kJ Calculate the ∆H for the... more
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03/19/20

How many grams of MgCl2 will be produced from 16.0g of Mg(OH)2 and 11.0g of HCl
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03/19/20

calculate the __ for the combustion reaction?
A 0.608-g sample of quinizarin (C14H8O4) is burned in a bomb calorimeter and the temperature increases from 25.70 °C to 28.19 °C. The calorimeter contains 1.18×103 g of water and the bomb has a... more
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03/19/20

Precalc Question (answer asap thanks)
A merry-go-round is rotating at the constant angular speed of 3 RPM counterclockwise. The platform of this ride is a circular disc of radius 24 feet. You jump onto the ride at the location pictured... more
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03/19/20

the standard enthalpy is

A scientist measures the standard enthalpy change for the following reaction to be -137.6 kJ:NH4NO3(aq) N2O(g) + 2 H2O(l)Based on this value and the standard enthalpies of formation for the other... more
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03/19/20

How many milliliters of a 5.0 M H2SO4 stock solution would you need to prepare 103.5 mL of 0.31 M H2SO4?
How many milliliters of a 5.0 M H2SO4 stock solution would you need to prepare 103.5 mL of 0.31 M H2SO4?
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03/19/20

Periodic table/electron configuration/ion help
Formula of ionic compound formed: AlCl3Cation formed?Anion formed?Electron configurations for the elements?
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03/18/20

Statistics 3302
A weighted die has probability 0.102 of landing on a 6. If you roll the die until you get a 6 for the first time, what is the expected number of rolls it will take?Round to the nearest integer.
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03/18/20

How to write Polynomial
How do I write a polynomial that is of the lowest degree with zeroes of 4/3(multiplicity of 2) and -1/3(multiplicity of 1) and with f(0)= -32
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03/18/20

Lighthouse is located on an island 4 km away from P on a straight shoreline and its light makes 7 revolutions per min. How fast is the beam of light moving along the shoreline when it is 1 km from P?

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03/18/20

If sin(a) = -3/5 and tan a< 0, find the exact value of a) tan(a-pi/4 ) and b) cos(2a)
Hehe I am so confused someone help
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03/18/20

Find all pairs of real numbers (a,b) such that (x-a)^2+(2x-b)^2=(x-3)+(2x^2)
Give an explanation on how to solve it please.
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03/17/20

Which corresponds to the perimeter of triangle ABC? A(-5, -1) B(-2, 3) C(6, -3)
A) 15B) root of 250C) 15+root of 125D) 125+root of 125
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03/17/20

Find the slope of the line that contains the points named. K(c + d, c - d), L(c - d, c + d)
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03/17/20

What ticket price would maximize revenue
A baseball team plays in a stadium that holds 56000 spectators. With the ticket price at $12 the average attendance was 24000. When the price dropped to $9, the average attendance rose to 28000.... more
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03/16/20

I am having trouble with this chemistry problem

A buffer solution is made such that the initial concentrations of lactic acid (HC3H5O3) and the lactate ion (C3HO) are .6M and .620M, respectively. What is the resulting pH if 100.0 mL of .2M... more
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03/16/20

Finding the equation of a circle with a curvature equal to the curvature of a given curve at a point
"Find an equation for the circle of curvature of the curve r(t)=8t i + sin(5t) j at the point (4pi,1). (the curve parameterizes the graph of y=sin(5/8X) in the xy plane) Ive already found v(t)=8... more
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03/16/20

Change in angular momentum
A ball is dropped vertically from a point (coordinates: 0; 5,00; 0) with initial velocity 6,00 m/s. Find change in angular momentum delta L with respect to the start of the coordinate system during... more
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03/16/20

Draw the following structures.
Draw the structures of the following:a. A compound with empirical formula C5H8O that gives a positive iodoform test and does not decolorize KMnO4.b. A compound with empirical formula C5H8O that... more
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03/15/20

Use the formulas for lowering powers to rewrite the expression in terms of the first power of cosine, as in Example 4. cos4(x) sin4(x)
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03/15/20

Can you please find the Eigenvalues and eigenvectors of this expression?
p(x,y,z) = 3x2 + y2 +2z2 - 2xy +2xz - 2yz
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