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QUESTION 5 a(i) Explain what is meant by the term cova…

QUESTION 5 a(i) Explain what is meant by the term covalent bonding. (2) a(ii) Draw a dot and cross diagram to show the bonding in a molecule of ethene, C2H6 Show only the outer electrons. (2) b Substances A and B are covalently bonded and have simple molecular structures. The table below gives the boiling points for substances A and B. Substance Boiling point in

QUESTION 1 When a liquid evaporates at room temperat…

QUESTION 1 When a liquid evaporates at room temperature, it changes into a gas. The diagram (see the diagram pdf) shows the arrangement of the particles in a liquid. a Complete the diagram to show the arrangement of four particles in a gas. (1) b Describe the movement of particles in a gas. (1) c Explain why heating a liquid causes it to evaporate more quickly. (2)

QUESTION 9 This question is about elements in Groups…

QUESTION 9 This question is about elements in Groups 1 and 7 of the Periodic Table. a The diagram (see the diagram pdf) shows two ways in which potassium can be converted into potassium chloride. Give the names of gas X, colourless solution Y and acid Z. (3) b When sodium is burned in bromine gas, sodium bromide is formed. b(i) Write a chemical equation for the reaction between sodium and bromine. (1) b(ii) Give a test to show that an aqueous solution of sodium bromide contains bromine ions. (3)

QUESTION 2 This question is about the element beryll…

QUESTION 2 This question is about the element beryllium. a Use the words below to complete the sentences about beryllium. electrons negative neutral neutrons nucleus positive protons shells Each word may be used once, more than once or not at all. An atom of beryllium has a central …………………………………………………….. that contains particles called …………………………………………………….. and …………………………………………………….. . Around these particles there are …………………………………………………….. orbiting in …………………………………………………….. . An atom of beryllium has no charge because it contains equal numbers of …………………………………………………….. and …………………………………………………….. . The particles with the lowest mass in an atom of beryllium are called …………………………………………………….. . (7) b Beryllium forms a compound with the formula BeCO3 b(i) How many different elements are there in BeCO3? (1) b(ii) What is the total number of atoms in the formula BeCO3? (1)

INSTRUCTIONS 1. Ensure that you answer all the questio…

INSTRUCTIONS 1. Ensure that you answer all the questions. 2. All questions must be answered on paper. Graphs must be done on graph paper. Upload your final answer paper as one file in the upload quiz. Name your file NAME_IG_NOV_1C_EXAM. 3. You must start the upload quiz immediately after finishing the quiz. This will be monitored and your test may not be marked if you do not start the upload quiz immediately. Enough time has been allocated to the upload quiz for scanning and submitting. 4. Calculators may be used. 5. Only the specification Periodic Table may be used. There is a link to it below if you have not printed a copy. 6. Any pictures related to questions can be accessed by pressing on the related button. 7. It is in your own interest to read each question carefully before answering Right-click on the button to open the Periodic Table in a new tab. Right-click on the button to open the diagram pdf in a new tab.

QUESTION 12 Dilute sulfuric acid can be used to make…

QUESTION 12 Dilute sulfuric acid can be used to make soluble and insoluble salts. a A student plans an experiment to obtain a pure, dry sample of the soluble salt, sodium sulfate, from dilute sulfuric acid. a(i) The student does a titration to find the volume of sulfuric acid needed for complete reaction with the other reactant. Describe the steps she should take in her titration. Refer to these pieces of apparatus in your answer.· pipette· burette· conical flask (5) a(ii) The diagram (see diagram pdf) shows the burette readings in one titration. Use these readings to complete the table, giving all values to the nearest 0.05 cm3. Burette reading in cm3 after adding solution Burette reading in cm3 before adding solution Volume of solution added in cm3 (3) b The student plans a different experiment to obtain a pure, dry sample of the insoluble salt, barium sulfate, from dilute sulfuric acid. Describe the steps she should take in her experiment. (5)

Lees (read) die teks en beantwoord (answer) die vrae….

Lees (read) die teks en beantwoord (answer) die vrae. Willie Wonka se sjokolade-fabriek [1] “O, wat ŉ man is hy, hierdie Willie Wonka!’’, roep Oupa Joe uit. Daar is so baie verskillende soorte sjokolade om van te kies. Dit is baie moeilik om ŉ keuse te maak. Het jy geweet dat hy byvoorbeeld al meer as tweehonderd nuwe soorte sjokoladestafies ontwerp het? [2] Sy sjokoladestafies het elk die soetste, romerigste en lekkerste binnekant, wat geen ander fabriek nog kon maak! Die nuutste een is die sneeuwit sjokolade. Willie Wonka se sjokolade is baie goedkoop. Ons kan hulle aanhoudend koop. “Sowaar!” roep Ouma Josephine uit. Hy stuur dit na al die uithoeke van die wêreld! [3] Is dit nie so nie, Oupa Joe?” “Dit is so, my liefling, dit is. Al die konings en presidente van die wêreld eet ook sy sjokolade. Hy maak nie net sjokoladestafies nie. O, grote griet, nee! Mnr. Willie Wonka het al met fantastiese uitvindsels na vore gekom. Het jy geweet dat hy nou net ŉ manier uitgevind het hoe om sjokoladeroomys te maak? Dit kan nogal vir ure koud bly sonder om dit in die yskas te sit. [4]Dit sal nie eers loperig raak as dit die heeltyd op ŉ warm oggend in die son lê nie.” “Dit is onmoontlik!”, sê klein Charlie, wat sy oupa aanstaar. “Natuurlik, dit ís moontlik!”, roep Oupa Joe hard uit. [5]“Dit is totaal ongehoord! Willie Wonka is die enigste persoon wat dit reggekry het!” “Reg genoeg!” Die ander knik hulle koppe instemmend. “Mnr. Willie Wonka het dit gedoen! [Uittreksel uit ŉ boek deur Roald Dahl]