only in living tissues. A few years later‚ in 1800 Alessandro Volta discovered that electricity could be produced through inorganic means. In fact‚ by using small sheets of copper and zinc and cloth spacers soaked in an acid solution‚ he built a battery - the first apparatus capable of producing electricity. Naysayers were quick to predict that electricity would never serve a useful purpose. Obviously they were very wrong. Electricity has a central role in our lives and to this day Electrochemistry
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HKDSE CHEMISTRY – A Modern View (Chemistry) Coursebook 3 Suggested answers |Chapter 25 Simple molecular substances with non-octet |Page Number | |structures and shapes of simple molecules | | |Class Practice |1 | |Chapter Exercise
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(c) (d) Figure 9.17‚ shows simple apparatus that determines the relative conductivities of pure water and solutions. Two metal electrodes are connected to a battery and a light bulb. When the electrodes are immersed in the solution‚ the light bulb will glow only if circuit is complete so that electricity flows from one electrode to the other through the solution. The more ions a solutions has‚ the greater conductivity
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= RI2 V = (Ra + R2) 0.25A V=V (Ra + R1) 0.75A = (Ra + R2) 0.25A (Ra + R1) 3 = Ra + R2 3Ra + 3R1 = Ra + R2 2Ra = R2 – 3R1 Ra = 0.5(R2 – 3R1) 3. In a simple series circuit a battery is connected through an ammeter to an electric lamp. A voltmeter is connected parallel to the lamp. The ammeter reads 0.75 A and the voltmeter 50 V. What is the resistance of the lamp neglecting the current drawn by the voltmeter? If the current in
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section. 1. Discuss Alan’s criminal liability for his statement to Bhu‚ “We sort out thieves like you.” (7 marks) I think that Alan would be trialled for assault under s. 47 of the Offences Against the Person Act 1861. This crime cannot be battery as no force has been used‚ neither can it be GBH or ABH as no wounding or injury has been caused. Assault offences can be done by: silence alone- as shown in the case of R v Ireland; as written words- shown in the case of R v Constanca; Psychological-
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microphone on this unit is adjustable and it also comes with added padded for the ear cups. The Logitech Wireless G930 has a frequency response of 50 to 20 kHz‚ an impedance of 32 ohms‚ a 40 mm driver‚ and a dry weight of 1.1 pounds. Moreover‚ the battery of this unit can last you for ten hours per charge on the USB recharging base. The left ear cup contains the power switch‚ the surround sound button‚
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Core 1 summary notes 1) Fossils fuels provide both energy & raw materials such as ethylene‚ for production of other substances Identify the industrial source of ethylene from the cracking of some of the fractions from the refining of petroleum Catalytic cracking is the process whereby high molecular weight fractions are broken down to low molecular weight ones. This process is used in petroleum refineries where crude oil is broken down to smaller alkenes and alkanes‚ until ethene‚ propene‚
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Battery cages How have the demands of consumers influenced the way farmers manage their egg industry in Australia? Battery cages are cages in which farmers use in the egg industry to house hens. Around 8 to 10 hens are confined in the space about the size of a cabinet drawer. The eggs are laid onto wire cage floors and roll to the front of the cage for collection. Battery cages are stacked in rows on top of each other‚ so within a single building‚ hundreds of thousands of birds are housed. The
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hens produce a very high yield of around 300 eggs a year. Chickens will naturally live for 6 or more years but after 12 months‚ the hen’s productivity will start to decline. This is when most commercial laying hens are slaughtered. BATTERY CAGES In Europe‚ a battery cage typically holds 4 or 5 hens with a legal space allowance per bird of less than an A4 sheet of paper. The height of the cage is only just enough to allow the hen to stand upright. In the US‚ the space allowance per hen is even lower
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HKDSE CHEMISTRY – A Modern View (Chemistry) Coursebook 3 Suggested answers Chapter 25 Simple molecular substances with non-octet structures and shapes of simple molecules Page Number Class Practice 1 Chapter Exercise 2 Chapter 26 Bond polarity Class Practice 4 Chapter Exercise 5 Chapter 27 Intermolecular forces Class Practice 7 Chapter Exercise 9 Chapter 28 Structures and properties of molecular crystals Class Practice 11 Chapter Exercise 12 Part Exercise 14 Chapter 29 Chemical cells in daily life
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