Tetraphosphorus decoxide (P4O10) reacts with water to produce phosphoric acid. Write and balance the equation for this reaction, and determine the number of moles of each reactant required to produce 5.80 moles of phosphoric acid. Answer Write a balanced equation for this reaction: Begin with the number of moles of H3PO4. Use a mole ratio …
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How are photosynthesis and cellular respiration related? Answer Photosynthesis uses the energy from the sun by converting carbon dioxide and water into glucose and oxygen. On the other hand, cellular respiration is the process in which glucose and oxygen are converted into energy. Therefore, these two processes are related to each other in terms of …
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Describe what happens during the interphase. Answer Interphase, which is the stage that occurs before the cell division, consists of three phases – the G1 phase, which is the stage of cell growth; the S phase, which is the stage for DNA replication; and the G2 phase, which is the preparation for cell division. Once …
How many valence electrons does a nitrogen atom possess? Answer: N has 5 valence electrons. Explanation Valence electrons are electrons in the outer shell of an atom. These electrons take part in chemical bonding. In the case of nitrogen, we have 5 electrons in the outer shell so those electrons are also valence electrons. The …
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Evaluate f(-3), f(0), and f(2) for the piecewise defined function. Then sketch the graph of the function. f(x) = {x + 2 if x < 0 1 – x If x ≥ 0} Answer x = -3 belongs to the interval x < 0 of the domain, so we use f(x)=x+2 f(-3) = (-3) +2 …
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Find the point at which the given lines intersect: r=<1, 1, 0>+t<1, -1, 2>, r=<2, 0, 2>+s<-1, 1, 0> Answer: (2, 0, 2) Explanation Principles: The vector equation of the two lines represents the set of all the points, through which the line passes through, where different points would have different values for the parametric …
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Although it’s hard to be definitive in classifying people as right- or left-handed, some studies suggest that about 14% of people are left-handed. Since 0.14 × 0.14 = 0.0196, the Multiplication Rule might suggest that there’s about a 2% chance that a brother and a sister are both lefties. What’s wrong with that reasoning? Answer: …
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A company is willing to renew its advertising contract with a local radio station only if the station can prove that more than 20% of the residents of the city have heard the ad and recognize the company’s product. The radio station conducts a random phone survey of 400 people. a) What are the hypotheses? …
Which newspaper features distinctive portraits called “dot-drawings” instead of actual photos? Answer The Wall Street Journal still uses dot drawings instead of actual photos. They began producing these dot drawings in 1979 and call them Hedcuts. Newspaper cartoons are a powerful means of gripping the attention of a large number of readers. It’s the pictures …
Which compound would you expect to have greater surface tension: acetone [(CH3)2CO] or water (H2O)? Explain. Answer: Tension of water is higher than acetone. Explanation Intermolecular bonds between multiple water molecules are hydrogen bonds, since water has a hydrogen atom attached to an electronegative atom (oxygen), and that hydrogen atom binds to an oxygen atom …
Which of the following is NOT true of deep ocean trenches? (A) They are long and narrow depressions in the ocean floor. (B) They are sites where plates plunge back into the mantle. (C) They are geologically very stable. (D) They may act as sediment traps. Answer: C. They are geologically very stable. Explanation A …
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Describe the three parts of an ATP molecule. Answer Adenosine triphosphate (ATP) is a chemical compound which serves as the chemical fuel of living organisms. ATP is composed of adenine, ribose, and 3 phosphate groups. At the center of the ATP is the sugar molecule called ribose. There is an adenine attached to one side …
The piston of a hydraulic automobile lift is 0.30 m in diameter. What gauge pressure, in pascals, is required to lift a car with a mass of 1200 kg? Also express this pressure in atmospheres. Answer: 1.7 atm
A 1130-kg car is held in place by a light cable on a very smooth (frictionless) ramp. The cable makes an angle of 31.0°C above the surface of the ramp, and the ramp itself rises at 25.0°C above the horizontal. (a) Draw a free-body diagram for the car. (b) Find the tension in the cable. …
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What three guidelines help management accountants provide the most value to managers? Answer Three guidelines that help management accountant to provide the most value to managers are: (1) employ a cost\u2013benefit approach, (2) give full recognition to behavioral and technical considerations, and (3) use different costs for different purposes. Cost-Benefit Approach: Managers continually face resource-allocation …
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Find a vector function that represents the curve of intersection of the two surfaces. The cylinder x^2+y^2=4 and the surface z=xy Answer: r(t) = 2 sin t, 2 cos t, 2 sin 2t. Explanation Rationalization. We know that one way of the parametrization of a circle of radius r in R^2 centered at the origin …
An oscillator creates periodic waves on a stretched string. a. IF the period of the oscillator doubles, what happens to the wavelength and wave speed? The wavelength doubles but the wave speed is unchanged. The wavelength is halved but the wave speed is unchanged. The wavelength is unchanged but the wave speed doubles. b. If …
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There is a common misconception that traditional taxonomy is based on morphology, while cladistics is based on genetic data. How is this misconception incorrect? Answer Taxonomy is a branch of science that specializes in classification, especially in the classification of organisms. Cladistics is an approach to the classification of organisms in biology. The method uses …
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Verify that each given function is a solution of the differential equation. ty’−y=t2; y=3t+t2 Answer We have differentiated y(t) Plug the values of y(t) and y'(t) in the given differential equation. y is a solution of a given differential equation.
Calculate the ratio of effusion rates for Ar and Kr. Answer Mar = 39.948 g/mol – Determine the molar mass of argon. Mkr – 83.798 g/mol – Determine the molar mass of krypton. Substitute these molar masses into Graham’s law to determine the ratio of effusion rates.
