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Muhammad Rafae Khan

Muhammad R.

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Lijeesh Krishnan verified

Numerade educator

Butanol, a 4-carbon alcohol (butyl alcohol), is produced from the same feedstocks as ethanol, including corn grain and other biomass. However, butanol is superior to the more conventional ethanol in that butanol is immiscible in water, and has a higher energy content for the same volume. Furthermore, it is a better choice of fuel compared to more conventional fuels like gasoline as it is a renewable source of energy and there are fewer harmful emissions generated when ignited. Above is the structure of butanol. Including the above structure, how many structural isomers of butanol contain hydroxyl groups? A) 5 B) 3 C) 2 D) 4

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Rashmi Sinha verified

Numerade educator

In infrared spectroscopy, the sample to be tested is often sandwiched between slides made of an inorganic salt such as potassium chloride. This is because potassium chloride is transparent to infrared radiation, allowing the radiation to pass through the sample. A laboratory technician wants to clean his potassium chloride slides with a solvent, without the slides dissolving in the solvent. Which of the following solvents is most suitable? A) Pure water B) Hexane C) A solution of 70% ethanol in water D) Dilute hydrochloric acid

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Rashmi Sinha verified

Numerade educator

When driving on the highway, it is important to obey the speed limit. Driving too fast can lead to serious injuries if you lose control of the vehicle. Drivers that exceed the speed limit will be punished, such as being made to pay a fine. It is difficult to check the speeds of all vehicles on the highway at the same time. On one particular highway, the speed limit is 100 km/h, and any driver that exceeds 100 km/h at any point along the highway will be considered speeding. This strategy was used to obtain information about the speeds of cars travelling on the highway: Toll booths are placed 100 km apart along the highway. The time that a car passes through each toll booth is recorded. If a car reaches the next toll booth in less than 1 hour after passing through the previous toll booth, the driver will be fined for speeding. Which statement correctly describes the advantages and/or disadvantages of this strategy? A) Not all drivers that were actually speeding were fined for speeding, and not all drivers that were fined for speeding were actually speeding. B) All drivers fined for speeding were actually speeding, and all drivers that were actually speeding were fined for speeding. C) All drivers that were actually speeding were fined for speeding, but not all drivers that were fined for speeding were actually speeding. D) All drivers fined for speeding were actually speeding, but not all drivers that were actually speeding were fined for speeding.

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Kirsty Gledhill verified

Numerade educator

Wile E. Coyote chases the Road Runner over a cliff at a constant velocity. However, Road Runner stops right before he reached the end of the cliff, but Wile E. Coyote was not able to stop on time. If the beginning of the next cliff is L meters away from the edge of the first cliff, and it is H meters below the first cliff, what minimum speed that Wile should have so that he can safely land on the tip of next hill without falling into the river? A) v0 = L * sqrt(g / (2H)) B) v0 = L * sqrt(g / H) C) v0 = L * sqrt((2g) / H) D) v0 = 2L * sqrt(g / H)

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An \( X \)-ray diffraction machine uses an \( X \)-ray to determine the distance between Iwo alomic planes in a crystalline material. The behaviour of the X-rays obey Bragg's Law, where a peak in the signal will be observed for a certaln vatue of 8 when \( 2 \mathrm{~d} \sin \theta=n d \). Where \( d \) is the distance between two atomic planes, \( \lambda \) is the wavelength of the \( X \)-rays used, and n has to be an integer value. If one knows the value of \( \lambda \), one can use the vatue of 0 of the observed peak to find the vatue of \( d \), the dlstance between two atomic planes. John wants to use an \( \mathrm{X}-\mathrm{ray} \) of energy 180 eV to measure exactly the distance between two atomic planes, which he estimates to be between 0.5 and 1 nm . However, he found that he was unable to do so. Which statement best explains why? A) The wavelength of the x -ray used is too small. B) The wavelength of the \( X \)-ray used is too large. C) The value of 8 is close to aero. D) The value of 9 is more than \( 90^{*} \).

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Rashmi Sinha verified

Numerade educator

A student wishes to perform electrolysis on an aqueous solution of copper (II) sulfate. Which of the following combinations of electrodes will keep the concentration of copper ions in the solution constant throughout the duration of electrolysis? A) Cathode: Copper Anode: Graphite B) Cathode: Copper Anode: Magnesium C) Cathode: Graphite Anode: Graphite D) Cathode: Graphite Anode: Copper

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Rashmi Sinha verified

Numerade educator

In the global race to produce advanced semiconductor chips, some countries have suggested restricting the supply of important chemicals to the semiconductor industries of their rivals. An important chemical in photolithography, a key step in producing semiconductor chips, is propylene glycol monomethyl ether acetate. Which statement about propylene glycol monomethyl ether acetate is incorrect? A) Propylene glycol monomethyl ether acetate contains polar bonds. B) Molecules of propylene glycol monomethyl ether acetate can form hydrogen bonds with each other. C) Propylene glycol monomethyl ether acetate contains 1 chiral centre. D) 1 molecule of propylene glycol monomethyl ether acetate contains 2 pi electrons only.

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The Haber process is a reaction utilized in industry to produce ammonia from nitrogen gas and hydrogen gas. \( \mathrm{H}_{2}+\mathrm{N}_{2} \) = \( \mathrm{NH}_{3} \) Usually, iron is used as a catalyst. Which of the following statements is not correct? A) Adding a catalyst lowers the activation energy of the Haber process. B) Adsing a catalyst will increase the yield of the Haber process, when the system is allowed to reach equilibrium. c) Adding a catalyst increases the rate of the forward reaction in the Haber precests. D) Iros is a heterogeneous catalyst in the Haber process.

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Ankur S verified

Numerade educator

The system shown consists of a block suspended from the ceiling by a spring. The block is given a small displacement, and subsequently exhibits simple harmonic motion. Which graph represents the plot of acceleration against displacement?

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In fluid dynamics, viscosity is a measure of how resistant a fluid is to a change in its shape, or more Intuitively, its opposition to flow. Fluids with different viscosities exhibit different physical properties. Shawn wanted to examine how the viscosity of a gas or liquid might change when its temperature increases. Which of the following statements is true? A) When a gas is heated, the intermolecular forces of attraction between particles will be wakened, hence its viscosity would decrease. B) When a gas is heated, the particles in the gas will collide with each other more frequently, hence its viscosity would increase. C) When a liquid is heated, the intermolecular forces of attraction between particles will be strengthened, hence its viscosity would increase. D) When a tiquid is heated, it remains a liquid hence its viscosity stays constant.

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