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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Prefix divide by Pico- Nano- milli- 0.000‚000‚000‚001 0.000‚000‚001 0.001 centi- 0.01 deci- 0.1 deka- 10 hecto- 100 Kilo- 1‚000 Mega 1 kcal = 1000 cal 1 Cal= 1 kcal 1 cal = 4.184 1‚000‚000 • Neutral atoms contain the same number of electrons and protons. • Components of a mixture can be separated (purified) by physical means. • Physical changes alter a substance without any changes to the chemical composition. • Chemical change involves breaking
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I https://www.oppapers.com/join.php#submit . Experiments with Metals and Ions of Metals Introduction Metals are similar in their physical properties in general‚ but they are not identical. Most of the metals are solids; few of them are liquids‚ such as mercury and cesium. Density of metals is not similar also. For example‚ sodium has density of 0.97g/cm3 while lead has density of 11.4g/cm3. Melting point of sodium is 98.0oC while for lead it is 327.6oC. Metals have the capability
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dinitrogen monoxide dinitrogen pentafluoride N O N F III. Binary Acids • contain hydrogen and a nonmetallic element • are an aqueous solution of the pure compound • have prefix hydro‚ suffix ic 1. 2. 3. 4. 5. hydroiodic acid hydrobromic acid hydrochloric acid hydrofluoric acid hydrocyanic acid HI(aq) HBr(aq) HCl(aq) HF(aq)
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Q. 1. During the electrolysis of molten lead bromide‚ which of the following takes place : A : Bromine is released at the cathode. B: Lead is deposited at the anode. C : Bromine ions gain electrons. D: Lead is deposited at the cathode. Ans : - D. Q. 2. Here is an electrode reaction : Cu → Cu2+ + 2e-. [i.e. Cu- 2e- →Cu2+]. At which electrode(anode or cathode) would such a reaction take place. Is this an example of oxidation or reduction. Ans : - At anode. Oxidation. Q. 3. A solution contains
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Kinetics Kinetics 6.1 Rates of reaction 6.2 Collision theory 6 16.1 Rate Expression (AHL) 16.2 Reaction mechanism (AHL) 16.3 Activation energy (AHL) 6.1 Rates of reaction 6.1.1 Define the term rate of reaction. 6.1.2 Describe suitable experimental procedures for measuring rates of reactions. 6.1.3 Analyse data from rate experiments. © IBO 2007 Figure 601 An explosion is a quick reaction D ifferent chemical reactions occur at different rates (i.e. speeds)
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1. A ________ is a well-tested and widely accepted view that best explains certain scientific observations. Answer | | hypothesis | | | generalization | | | law | | | theory | 2 points Question 2 1. What are the basic differences between the disciplines of physical and historical geology? Answer | | physical geology is the study of fossils and sequences of rock strata; historical geology is the study of how rocks and minerals were used in the past |
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Sp N ec e ifi w ca tio n Centre Number 71 Candidate Number General Certificate of Secondary Education 2013–2014 Science: Single Award Foundation Tier GSS21 Unit 2 (Chemistry) [GSS21] THURSDAY 15 MAY 2014‚ MORNING TIME 1 hour. INSTRUCTIONS TO CANDIDATES Write your Centre Number and Candidate Number in the spaces provided at the top of this page. Write your answers in the spaces provided in this question paper. Answer all eleven questions. For Examiner’s use only Question Marks Number 1
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| H R R Primary Alcohol(1 ̊) Secondary Alcohol(2 ̊) Tertiary Alcohol(3 ̊) Lucas reagent‚ a mixture of concentrated hydrochloric acid and anhydrous zinc chloride‚ can be used to differentiate the three classes of alcohols. Tertiary alcohol turns cloudy or appears in two layers almost immediately‚ secondary alcohol reacts within 5 to 10 minutes whereas primary alcohol reacts very slowly
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example of this was a man named James Marsh. A man named John Bodle had been accused of poisoning his grandfather with arsenic-laced coffee. Marsh performed the standard chemical test by mixing a suspected sample of arsenic with hydrogen sulfide and hydrochloric acid. Though he was able to detect arsenic as yellow arsenic trisulfide‚ when it came to show it to the jury it had
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