Questions

Write The Chemical Equation That Represents The Process Of Lattice Energy For The Case Of Nacl.

Write the chemical equation that represents the process of lattice energy for the case of NaCl. Answer Lattice energy in this case is the energy needed to split 1 mol of solid NaCl into the ionic components. Lattice energy: It is defined as energy released when ions combine together in a gaseous phase to form …

What Is The Rock’s Velocity As It Hits The Bottom Of The Hole?

A rock is tossed straight up with a speed of 20 m/s. When it returns, it falls into a hole 10 m deep. a. What is the rock’s velocity as it hits the bottom of the hole? b. How long is the rock in the air, from the instant it is released until it hits …

What Are Two Types Of Oligarchies?

What are two types of oligarchies? theocracy and monarchy dictatorship and theocracy communism and dictatorship theocracy and communism Answer: Theocracy and communism. Explanation Oligarchy is where a small group of people have control over a country or organization. Theocracy is a system of government where the priests rule in the name of God. Monarchy is …

An Ascending Elevator, Hanging From A Cable, Is Coming To A Stop.

For the problem, identify all the forces acting on the object and draw a free-body diagram of the object. An ascending elevator, hanging from a cable, is coming to a stop. Answer   The forces that are acting on the elevator, as shown in the figure above, are: The tension force due to cable. The …

If The Solution Is NaCl(aq), What Is The Concentration Of Chloride Ion?

An aqueous solution contains 1.2 mM of total ions. If the solution is NaCl(aq), what is the concentration of chloride ion? Answer The Concentration of chloride ion is 0.6 mM.

Use Symmetry to Evaluate the Double Integral

Use symmetry to evaluate the double integral. ∫∫R xy/1+x^4dA, R={(x,y) | -1 ≤x≤1, 0≤y≤1} Answer: 0 Explanation First, notice that you can split the integral into the two single variable integrals. The integral involving x may seem troublesome to integrate, but notice that this is an odd function over the symmetric domain with respect to …

Which Ions Remain In Solution, Unreacted, After Each Of The Following Pairs Of Solutions Is Mixed?

Which ions remain in solution, unreacted, after each of the following pairs of solutions is mixed? potassium carbonate and magnesium sulfate. Answer When potassium carbonate and magnesium sulfate are mixed, the solution contains:

What Was The South Atlantic System And How Did It Shape The Colonial Society?

What was the South Atlantic System and how did it shape the colonial society? Answer The South Atlantic system included the Spanish colonies in South and Central America, the Portuguese colony of Brazil, the sugar-producing islands of the Caribbean, West Africa, and the southern colonies in North America. Its most prominent products were silver, sugar, …

Points S, T, and P lie on a number line. Their coordinates are 0, 1, and x, respectively.

Points S, T, and P lie on a number line. Their coordinates are 0, 1, and x, respectively. Given SP = PT, what is the value of x? Answer: x = 0.5 Explanation Use the coordinates of points S and P and find the length of SP. Since the points are on a number line, …

Which Postulate Of The Kinetic Molecular Theory Breaks Down Under Conditions Of Low Temperature?

Which postulate of the kinetic molecular theory breaks down under conditions of low temperature? Explain. Answer: The lower the temperature, the lower the pressure than the ideal gas law predicts. Explanation At lower temperatures, the molecules have reduced kinetic energy. Lower kinetic energy reduces successful collisions and thus reduces reactivity and the number of interactions. …

Three Identical Point Charges Q Are Placed At Each Of Three Corners Of A Square Of Side L.

Three identical point charges q are placed at each of three corners of a square of side L. Find the magnitude and direction of the net force on a point charge -3q placed (a) at the center of the square and (b) at the vacant corner of the square. In each case, draw a free-body …

Is the Correlation Between the Heights of Husbands and Wives

The mean height of married American women in their early twenties is 64.5 inches and the standard deviation is 2.5 inches. The mean height of married men the same age is 68.5 inches, with standard deviation 2.7 inches. The correlation between the heights of husbands and wives is about r = 0.5. Find the equation …

Use the Given Graph Of f To Find a Number δ Such That If |x − 1| < δ then |f(x) − 1| < 0.2

Use the given graph off to find a number δ such that if I x – 1 I < δ then I f(x) – 1 I < 0.2 Answer: 0.1 Explanation

A Cessna Aircraft Has A Liftoff Speed Of 120km/h

The thrust created by a lone jet engine produces a force of F = 78000 N. It takes the aircraft (with a mass of m = 7300 kg) a distance of d = 0.71 km to take off. A) What is the take-off speed of the aircraft vt in m/s? B) How far in meters …

Explain How Two Samples Can Have The Same Mean

Explain how two samples can have the same mean but different standard deviations. Draw a bar graph that shows the two samples, their means, and standard deviations as error bars. Explanation The mean is a measure of the center of some sample, while the standard deviation measures variation of some sample. If two samples have …

Write the Equation in Spherical Coordinates

Write the equation in spherical coordinates. x^2−2x+y^2+z^2=0 Answer:  Recall that in spherical coordinates x = psin 0 cosO and that x^2+y^2+z^2=p^2. By using this we obtain the equation: p^2 – 2psin 0 cosO = 0

A Boat Is Towing Two Skiers At The Same Time – How Long Should The Tow Lines Be?

A Boat Is Towing Two Skiers At The Same Time. How Long Should The Tow Lines Be? both lines should be the same length. the oldest skier’s line should be longer. the skier with the most colorful skis should have a longer line. the skier not wearing a pfd must have the shorter line. Answer: …

What Is Most Likely To Cause Someone To Fall Overboard

What is most likely to cause someone to fall overboard? balancing the weight of people and gear sitting on a pedestal chair while anchored fishing from a boat standing up in a boat Answer: standing up in a boat. Explanation Someone is most likely to fall overboard when you make the biggest change in the …

When A Sound Wave Passes From Air Into Water, Do You Expect The Frequency Or Wavelength To Change?

When sound travels from air into water, does the frequency of the wave change? The speed? The wavelength? Explain your reasoning. Explanation Know the equation: wavelength = v/f. When sound travels from air into water frequency doesn’t change because it’s directly proportional to the source. Speed changes, because it is directly proportional to medium, and …

Which Of The Following Are True About Marijuana:

Which of the following are true about marijuana: A. It can impair learning and memory B. It can bring upon panic attacks or anxiety C. It can become addictive D. All of the above Answer: D. All of the above Marijuana can be found in all of the above-mentioned forms. It is because it is …