Blog

1.1 The two dots highlighted in blue in the Lewis diagram below represent the following type of electrons: Right click on the button below to open the image in a new tab. (2)

1.7 To what volume must 20cm3 of a 10mol.dm-3 potassium hydroxide solution (KOH) be diluted to obtain a 2mol.dm-3 solution? (2)

VRAAG 6 Metaan verbrand in suurstof en produseer koolstofdioksied en water. Hierdie reaksie word deur die volgende vergelyking voorgestel: CH4(g) + 2O2(g) → CO2(g) + 2H2O(g) 6.1 Gee die naam vir hierdie tipe reaksie. (1) 6.2 4dm3 metaan verbrand, watter volume waterdamp sal geproduseer word? (2) [3]

1.10 The Kc value for a certain reaction is 0.0023. This small Kc value indicates that ______. (2)

1.9 Kies die regte terme om die volgende sin te voltooi: Koolstoftetrafluoried is ‘n ________ vormige molekuul en is _______. (2)

INSTRUKSIES   1. Hierdie vraestel bestaan uit AGT vrae. Beantwoord VRAAG 1 op die rekenaar en VRAAG 2 tot VRAAG 8 op aparte papier en laai die antwoorde in die “Quiz” op wat na hierdie een volg.   2. Begin ELKE vraag op ‘n NUWE bladsy.   3. Nommer die antwoorde korrek volgens die nommeringstelsel wat in hierdie vraestel gebruik is.   4. Laat EEN reël tussen twee subvrae oop, byvoorbeeld tussen VRAAG 2.1 en VRAAG 2.2.   5. Jy mag ‘n nieprogrammeerbare sakrekenaar gebruik.   6. Jy mag toepaslike wiskundige instrumente gebruik.   7. Jy word aangeraai om die aangehegte GEGEWENSBLAAIE te gebruik.   8. Toon ALLE formules en vervangings in ALLE berekeninge.   9. Rond jou FINALE numeriese antwoorde tot ‘n minimum van TWEE desimale plekke af.   10. Gee kort (bondige) motiverings, besprekings, ensovoorts, waar nodig.   11. Skryf netjies en leesbaar.   12. Handig asseblief Afdeling B in as ‘n ENKELE PDF LêER. Benoem die lêer as volg: NAAM_VAN_PHSC_SBA004b  

1.1 Die twee kolletjies wat in die Lewis-diagram hieronder blou is, stel die volgende tipe elektrone voor:   (2)

INSTRUCTIONS 1. This question paper consists of EIGHT questions. Answer QUESTION 1 on the computer and QUESTION 2 to QUESTION 8 on a separate piece of paper and upload the answers in the Second quiz provided. 2. Start EACH question on a NEW page. 3. Number the answers correctly according to the numbering system used in this question paper. 4. Leave ONE line open between two sub-questions, for example between QUESTION 2.1 and QUESTION 2.2. 5. You may use a non-programmable calculator. 6. You may use appropriate mathematical tools. 7. You are advised to use the attached DATA SHEETS. 8. Show ALL formulas and substitutions in ALL calculations. 9. Round off your FINAL numerical answers to TWO decimal places. 10. Give short (concise) motivations, discussions, etc., where necessary. 11. Write neatly and legibly. 12. Please submit Section B in the SECOND QUIZ as a SINGLE PDF File. Name the file as follows: NAME_SURNAME_GR11E_PHSC_SBA004B

1.3 Select the chemical formula below that is an example of a trigonal pyramidal shaped molecule. (2)

 Question 4   4.1 Define an Ideal Gas. (4) 4.2 List the two conditions under which a real gas does not behave like an ideal gas. (2) 4.3 A sample of an ideal gas occupies a volume of 183 cm3 at 98 kPa and 23°­C. What volume will it occupy if the pressure is adjusted to 73 kPa and the temperature remains unchanged? (5) 4.4 Name the scientific law that you used to calculate your answer in question 4.3. (1) 4.5 Two moles of an ideal gas is contained in a 2.0L container at a temperature of 23°C. The gas exerts a pressure of 16atm on the container. If pressure and amount of gas is kept constant, what is the final volume of the gas if the temperature of the container is increased to 98°C? (5)     [17]