Solid oxide fuel cells (SOFC) have been proposed as an alternative energy technology for use in large stationary power applications (1 to 10MWof electrical power). These devices have an ion...

Explain the meaning of each of the following terms. In your answer include an example to help with your explanation. a. Expansion. b. Contraction. c. Physical change. d. Sublimation. e. Diffusion. f....

A city with a population of 200,000 people operates a 20:0 10 6 gal/day wastewater treatment plant. For every million gallons of wastewater treated, 1875 lbm of solids are generated, with 75% of the...

This question is about FORCE and ACCELERATION. The driver of a car moving at 20 m/s along a straight level road applies the brakes. The car decelerates at a steady rate of 5 m/s 2 . a. How long does...

Natural gas that contains methane, ethane, and propane is to be burned with humid air. The adiabatic flame temperature is to be calculated from specified values of the following quantities: (a)...

Acetylene is produced by pyrolyzingdecomposing at high temperaturenatural gas (predominantly methane): The heat required to sustain this endothermic reaction is provided by feeding oxygen to the...

a. Write down, in words, the equation connecting speed, distance and time. b. A car travels at a steady speed of 20 m/s. Calculate the distance travelled in 5 s.

The wastewater treatment plant at the Ossabaw Paper Company paper mill generates about 24 tonnes of sludge per day. The consistency of the sludge is 35%, meaning that the sludge contains 35 wt%...

An unstable nucleus has 137 neutrons and 88 protons. It decays by emitting a -particle. How many neutrons and protons does the nucleus have after emitting the -particle? neutrons protons A 136 88 B...

The flow rate of a process stream has tended to fluctuate considerably, creating problems in the process unit to which the stream is flowing. A horizontal surge drum has been inserted in the line to...

Iram has 12 different DVDs of which 7 are films, 3 are music videos and 2 are documentaries. a. How many different arrangements of all 12 DVDs on a shelf are possible if the music videos are all next...

Purification of proteins for use as biopharmaceuticals is often accomplished by ion exchange chromatography, in which a process fluid passes through a column packed with small resin beads whose ionic...

Birch reduction of toluene leads to a product with the molecular formula C 7 H 10 . On ozonolysis followed by reduction with dimethyl sulfide, the product is transformed into What is the structure of...

Methane is generated via the anaerobic decomposition (biological degradation in the absence of oxygen) of solid waste in landfills. Collecting the methane for use as a fuel rather than allowing it to...

Boron is an element in Group 13 of the Periodic Table. a. Boron has two isotopes. What do you understand by the term isotope? b. State the number of i protons, ii neutrons and iii electrons in one...

The demand for biopharmaceutical products in the form of complex proteins is growing. These proteins are most often produced by cells genetically engineered to produce the protein of interest, known...

Phosgene (COCl 2 ) is formed by CO and Cl 2 reacting in the presence of activated charcoal: At T = 303:8 K the rate of formation of phosgene in the presence of 1 gram of charcoal is where C denotes...

A gas that contains CO 2 is contacted with liquid water in an agitated batch absorber. The equilibrium solubility of CO 2 in water is given by Henrys law (Section 6.4b) C A = p A /H A where C A...

Draw dot-and-cross diagrams for the ions in the following ionic compounds. Show only the outer electron shells. a. Potassium chloride, KCl b. Sodium oxide, Na 2 O c. Calcium oxide, CaO d. Magnesium...

Predict the products and propose mechanisms for the following reactions. a. b. c. d. H+ OCH,CH3 excess H,0

a. i. On analysis a hydrocarbon was found to contain 0.72 g of carbon and 0.18 g of hydrogen. What is the empirical formula of the hydrocarbon? ii. Further investigation showed that the relative...

A stone is dropped into a fast-flowing stream. It does not fall vertically because of the sideways push of the water (Figure 4.7). a. Calculate the resultant force on the stone. b. Is the stone in...

Many of the condensations we have studied are reversible. The reverse reactions are often given the prefix retro-, the Latin word meaning backward. Propose mechanisms to account for the following...

By referring to the periodic table (Figure 2.15 or inside front cover), identify the group and period to which each of the following elements belongs. Then decide whether the element is a metal,...

Review Conceptual Example 7 in preparation for this problem. In tests on earth a lunar surface exploration vehicle (mass = 5.90 10 3 kg) achieves a forward acceleration of 0.220 m/s 2 . To achieve...

Review Conceptual Example 7 as background material for this problem. A jet transport has a weight of 1.00 106 N and is at rest on the runway. The two rear wheels are 15.0 m behind the front wheel,...

You and your crew must dock your 25000 kg spaceship at Spaceport Alpha, which is orbiting Mars. In the process, Alphas control tower has requested that you ram another vessel, a freight ship of mass...

Calculate the force needed to give a car of mass 800 kg an acceleration of 2.0 m s 2 .

Review Conceptual Example 14 before attempting this problem. The truck in that example is traveling at 27 m/s. The density of air is 1.29 kg/m 3 . By how much does the pressure inside the cargo area...

Conceptual Example 5 provides background for this problem. A hole is drilled through a copper plate whose temperature is 11 C. (a) When the temperature of the plate is increased, will the radius of...

You and your team are asked to determine the hearing safety parameters for a loud experiment. Since the sound will persist for only a short time, the allowed intensity level that will not result in...

The Earth takes one year to orbit the Sun at a distance of 1.5 10 11 m. Calculate its speed. Explain why this is its average speed and not its velocity.

You and your team are exploring an antiquated research facility in the mountains of southern Argentina that had been abandoned in the 1960s. You come to a giant locked door that has no visible...

You and your team are designing a tunable, single-tone, acoustic emitter. One end of a string is connected to a post on the top of a frictionless inclined plane. The string supports a mass at rest...

A certain windmill produces an average of 0.50 MW of electrical power during the late evening hours when energy consumption is at a low (a four-hour span). An industrial capacitor (the BC125) has a...

A snail crawls 12 cm in one minute. What is its average speed in mm s 1 ?

A car travels one complete lap around a circular track at a constant speed of 120 km h 1 . a. If one lap takes 2.0 minutes, show that the length of the track is 4.0 km. b. Explain why values for the...

A hydrogen atom (Z = 1) is in the third excited state, and a photon is either emitted or absorbed. Concepts: (i) What is the quantum number of the third excited state? (ii) When an atom emits a...

An astronomer is measuring the electromagnetic radiation emitted by two stars, which are both assumed to be perfect blackbody emitters. For each star she makes a plot of the radiation intensity per...

Rays of light coming from the sun (a very distant object) are near and parallel to the principal axis of a concave mirror. After reflecting from the mirror, where will the rays cross each other at a...

An object falls at terminal velocity in air. What overall conversion of energy is occurring? A. Gravitational potential energy to kinetic energy B. Gravitational potential energy to thermal energy C....

Which of the following statements about effective nuclear charge for the outermost valence electron of an atom is incorrect? (i) The effective nuclear charge can be thought of as the true nuclear...

The AsAs bond length in elemental arsenic is 2.48 . The ClCl bond length in Cl 2 is 1.99 . (a) Based on these data, what is the predicted AsCl bond length in arsenic trichloride, AsCl 3 , in which...

Which quantity has the same unit as the rate of change of momentum? A. Acceleration B. Energy C. Weight D. Work

Two balls, each of mass 0.50 kg, collide as shown in Figure 6.6. Show that their total momentum before the collision is equal to their total momentum after the collision. before after 2.0 m s-1 3.0...

The solubility of two slightly soluble salts of M 2+ , MA and MZ 2 , are the same, 4 10 -4 mol/L. (a) Which has the larger numerical value for the solubility product constant? (b) In a saturated...

For each statement, indicate whether it is true or false. (a) The solubility of a slightly soluble salt can be expressed in units of moles per liter. (b) The solubility product of a slightly soluble...

As shown in Figure 14.24, the first step in the heterogeneous hydrogenation of ethylene is adsorption of the ethylene molecule on a metal surface. One proposed explanation for the sticking of...

A snooker ball strikes a stationary ball. The second ball moves off sideways at 60 to the initial path of the first ball. Use the idea of conservation of momentum to explain why the first ball cannot...

Which of these statements about alloys and intermetallic compounds is false? (a) Bronze is an example of an alloy. (b) Alloy is just another word for a chemical compound of fixed composition that is...

The following data are for a simple steam power plant as shown in Fig. P4.118. State 6 has x6 =0.92 and velocity of 200 m/s. The rate of steam flow is 25 kg/s, with 300 kW of power input to the pump....

The power stroke in an internal combustion engine can be approximated with a poly tropic expansion. Consider air in a cylinder volume of 0.2 L at 7MPa, 1800 K, shown in Fig. P6.111. It now expands in...

Calculate the mean drift velocity of electrons in a copper wire of diameter 1.0 mm with a current of 5.0 A. The electron number density for copper is 8.5 10 28 m 3 .

The solute in Problem 23-8 is initially dissolved in 80.0 mL of water. It is then extracted six times with 10.0-mL portions of chloroform. Find the fraction of solute remaining in the aqueous phase....

The success of an airline depends heavily on its ability to provide a pleasant customer experience. One dimension of customer service on which airlines compete is on-time arrival. The file...

A car is travelling round a bend when it hits a patch of oil. The car slides off the road onto the grass verge. Explain, using your understanding of circular motion, why the car came off the road.

Robs Market (RM) is a regional food store chain in the southwest United States. David White, Director of Business Intelligence for RM, would like to initiate a study of the purchase behavior of...

Many service companies collect data via a follow- up survey of their customers. For example, to ascertain customer sentiment, Delta Air Lines sends an email to customers immediately following a...

Show that an alternative equation for the centripetal acceleration is a = 2 r.

Consumer Research, Inc., is an independent agency that conducts research on consumer attitudes and behaviors for a variety of firms. In one study, a client asked for an investigation of consumer...

An toy truck of mass 0.40 kg travels round a horizontal circular track of radius 0.50 m. It makes three complete revolutions every 10 seconds. Calculate: a. Its speed b. Its centripetal acceleration...

TourisTopia Travel (Triple T) is an online travel agency that specializes in trips to exotic locations around the world for groups of ten or more travelers. Triple Ts marketing manager has been...

The diagram shows the arrangement of the outer electrons only in a molecule of ethanoic acid. a. Name the different elements found in this compound. b. What is the total number of atoms present in...

a. A sound wave travelling through air can be represented as shown in the diagram. Which distance, A, B, C, or D, represents: i. one wavelength? ii. The amplitude of the wave? b. The cone of a...

Calculate the energy in eV of an X-ray photon of frequency 3.0 10 18 Hz. To answer questions you will need these values: Speed of light in a vacuum c = 3.00 10 8 m s 1 Planck constant h = 6.63 10...

a. Outline the theory of the PET scanner. b. It is suggested that a scanner could be designed using the annihilation of a proton and an antiproton. Calculate: i. The energy released in the...

A particle of mass 2 kg is fired up a smooth slope of length 4m, with initial speed 10ms -1 , which is inclined at 30 above the horizontal. The bottom of the slope is at the same level as horizontal...

A medical researcher is conducting a study to test the effectiveness of a drug designed to lower cholesterol levels. She randomly selects a sample of 100 males and 100 females.

The activity of the enzyme amylase can be measured at a particular temperature by placing a sample into a Petri dish containing starch-agar (a starch-agar plate). Starch-agar is a jelly containing...

Two inhibitors of the same enzyme, inhibitor A and inhibitor B, were investigated to discover if they were competitive or non-competitive. In order to do this, the rate of reaction of the enzyme was...

If a 10 cm long piece of string was packed into a 5 cm long tube, the packing ratio would be 2 (2 cm of string per cm of tube). The packing ratio is a useful measure of the degree of compactness...

Figure 8.28, page 176, shows the pressure changes in the left atrium, left ventricle and aorta throughout two cardiac cycles. Make a copy of this diagram. Figure 8.28 a. i. How long does one heart...

A student made drawings of four blood cells as shown in the figure. The correct identification of the cells is: granular cytoplasm 2 nucleus nucleus nucleus 3.

Spud, Inc., a manufacturer of gourmet snacks, employs activity-based costing. The budgeted data for each of the activity cost pools is provided below for the year 2022. Estimated Estimated Use of...

Rearrange the statements below to produce a flow diagram showing the steps involved in producing bacteria capable of synthesising a human protein such as human growth hormone (hGH). 1. Insert the...

Use the Periodic Table shown below to help you. Write isotopic symbols for the following neutral atoms: The Periodic Table of the Elements a. Bromine-81 b. Calcium-44 c. Iron-58 d. Palladium-110....

Find a news report concerning drug testing of athletes. Summarize how the testing is being used, and discuss whether the testing is reliable.

The table shows the atomic number and boiling points of some noble gases. a. Use ideas about forces between atoms to explain this trend in boiling points. b. Xenon forms a number of covalently bonded...

The table lists bond lengths and bond energies of some hydrogen halides. a. What is the relationship between the bond length and the bond energy for these hydrogen halides? b. Suggest why the bond...

Look at the Periodic Table in Figure 10.2. Figure 10.2 a. Which element is found in Period 4, Group 17? b. The relative atomic masses of tellurium (Te) and iodine (I) are 128 and 127, respectively....

The rate of the following reaction between hydrogen peroxide (H 2 O 2 ) and iodide ions can be monitored using sodium thiosulfate and starch indicator: 2H + (aq) + H 2 O 2 (aq) + 2I (aq) 2H 2 O(l)...

The asymmetric bar shown has a weight of 7.6 N and a centre of gravity that is 0.040 m from the wider end, on which there is a load of 3.3 N. It is pivoted a distance of 0.060 m from its centre of...

A girl is riding a bicycle at a constant velocity of 3.0 m s 1 along a straight road. At time t = 0, she passes her brother sitting on a stationary bicycle. At time t = 0, the boy sets off to catch...

At 10 C ice changes to water. H 2 O(s) H 2 O(l) H = +6.01 kJ mol 1 a. Explain why the entropy change of the system is positive. b. The entropy change for the system is +22.0 J K 1 mol 1 . Calculate...

Go to the website for the U.S. Census Bureau and investigate the census conducted every 10 years. How and when will data be collected for the next census? Are any significant changes in the...

The Vice Presidents salary is currently 42% less than the Presidents salary, so the Vice Presidents salary is ____% of the Presidents salary. Of versus More Than. Fill in the blanks in Exercises....

Diffusion in a gas is the random motion of particles involved in the net movement of a substance from an area of high concentration to an area of low concentration. The process of diffusion also...

A student is trying to make an accurate measurement of the wavelength of green light from a mercury lamp. The wavelength of this light is 546 nm. Using a double-slit of separation 0.50 mm, the...

A medical researcher wants to test the claim that healthy adults have a mean body temperature of 98.6F.

A 4700 F capacitor has a p.d. of 12 V across its terminals. It is connected to a resistor and the charge leaks away through the resistor in 2.5 s. a. Calculate the energy stored on the capacitor. b....

When electromagnetic radiation of wavelength 2000 nm is incident on a metal surface, the maximum kinetic energy of the electrons released is found to be 4.0 10 20 J. Calculate the work function of...

a. State Hubbles law. b. The recession speed v against distance d graph for some galaxies is shown. Determine the Hubble constant from this graph. Explain your answer. c. The Big Bang occurred some...

a. Define the luminosity of a star. b. A red giant is a star bigger than our Sun. Explain how the surface of a red giant star can be cooler than the Sun, yet have a luminosity much greater than the...

Light from a galaxy is passed through a diffraction grating. The diagram shows part of the emission spectrum. The strong emission spectral line has wavelength 662 nm. a. Calculate the energy of a...

A company is preparing invoices to send to their customers. Before they are sent, they are checked and the daily number of mistakes found over a two-week period are recorded. Test, at the 5% level of...

A person stands on the ball of one foot. The normal force due to the ground pushing up on the ball of the foot has magnitude 750 N. Ignore the weight of the foot itself. The other significant forces...

Two vectors, each of magnitude 4.0 N, are inclined at a small angle below the horizontal, as shown. Let Sketch the direction of C(Vector) and estimate its magnitude. (The grid is 1 N on a side.) C =...

The histogram in Figure 4.9 shows the F-scale measurements of intensities of 490 tornadoes from recent years. (The F-scale runs from 0 to 5; a higher number indicates a stronger tornado.) Does It...

A 20.0 g lead bullet leaves a rifle at a temperature of 47.0C and travels at a speed of 5.00 10 2 m/s until it hits a 6.0 kg block of ice at 0C that is initially at rest on a frictionless surface....

Suppose the switch in Fig. 20.21 has been closed for a long time but is suddenly opened at t = t 0 . Which of these graphs best represents the current in coil 2 as a function of time? I 2 is positive...