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Q1:1. The number of protons represents the a. atomic mass b. atomic number c. atomic weight d. atomic Isotope 2. The number of electrons in an element equals a. the number of neutrons b. the number of protons c. the number of protons + neutrons d. the number of protons-neutrons 3. An element has an atomic number of 25. That element is a. Na b. Sr c. Mn d. Cr 4. One proper way to indicate an isotope of Si with an atomic mass of 28 is a. 28-SI b. Si-28 C. 285 28 Si d. 5. How many neutrons are in the nucleus of Mo? a. 53 b. 42 c. 48 U.S4See Answer
Q2:Fill in the Blank: Element Indium In Y S Rubidium Rb Argon Yttrium Sulfur Symbol Protons 1+ Ar 37 Neutrons 50 22 Electrons Atomic Number 49 18 39 16 Atomic Mass 114 32 85See Answer
Q3:1 roac S Ily Neutral Solution pH of . It is said to be neutral. • This means that there are as many H* as OH. are neutral. and • Pure . is neither acidic or basic.See Answer
Q4:Buffers Substances that change_____in pH. _____H+ when pH is to low (acidic). _______H+ when pH is to high (basic). See Answer
Q5: 3) Write the expression of base dissociation constant for the following reaction point out the conjugate acid: \mathrm{NH}_{3}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \rightleftharpoons \mathrm{NH}_{4}^{+}(\mathrm{aq})+\mathrm{OH}^{-}(\mathrm{aq})See Answer
Q6: The reaction of cyclohexadiene with acrolein is shown below. Use Frontier Molecular Orbital Theory (showing relevant orbital interactions) to explain why this reaction favours the endo product 18. Explain, using energy levels, why the reaction of cyclohexadiene proceedsrapidly with acrolein than with ethene.more Explain, using energy levels, why the reaction below, between an electron-deficient diene and an electron-rich alkene, occurs readily. Draw the structure, including stereochemistry, of the product 19 of the reaction below. Draw a 'curly' arrow mechanism and draw the transition state leading to See Answer
Q7: Many metals corrode. An experiment is carried out to see if magnesium ribbon wrapped around a piece of iron rod has an effect on the rate at which the iron rod rusts. The apparatus is shown in Figure 4. The method used is an iron rod, with magnesium ribbon wrapped around it, is placed in a boiling tube labelled A 10 cm3 water from a measuring cylinder is poured into this boiling tube an identical rod but with no magnesium ribbon wrapped around it is placed in a second boiling tube labelled B Both boiling tubes are left for a few days. (i) Explain why iron rod rather than stainless steel rod is used in this experiment. (iii) After a few days the two boiling tubes were examined. (ii) State why it is not necessary to use a pipette to measure out 10 cm3 water in this experiment.See Answer
Q8: Q4) Consider the following pH curve: a) Explain if the analyte used to obtain the following pH curve was strong or weak, an acid or a base, monoprotic or polyprotic and HOW YOU KNOW (i.e.what were the give away clues.) b) What would be an appropriate indicator for this reaction? Explain why.See Answer
Q9: Into a beaker of ultrapure water, 20 mL of hexane is added. A high-speed stirrer thencauses the hexane to be distributed into a dispersion of droplets, each of radius 1 um.If the water/hexane interfacial tension is 50.2 mN m-', how much work is done indispersing the oil? What is the pressure difference between the inside and outside of each droplet?See Answer
Q10: Which drawing(s) represents a face-centered cubic unit cell? See Answer
Q11: 14. The following table gives experimental boiling points for a series of compounds containing group 16 elements bonded to hydrogen atoms. a) (2 marks) Briefly explain the main reason why boiling point decreases from H2Te to H2Se to H2S. b) (1 mark) Briefly explain why H2O seemingly breaks this trend with a higher boiling point compared to most of the others. See Answer
Q12: In which reaction is nitrogen reduced? \mathrm{Cu}^{2+}+2 \mathrm{NO}_{2}+2 \mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{Cu}+4 \mathrm{H}^{+}+2 \mathrm{NO}_{3}^{-} \mathrm{Q} 4 \mathrm{Zn}+10 \mathrm{H}^{+}+\mathrm{NO}_{3}^{-} \rightarrow 4 \mathrm{Zn}^{2+}+\mathrm{NH}_{4}{ }^{+}+3 \mathrm{H}_{2} \mathrm{O} 2 \mathrm{NO}+\mathrm{O}_{2} \rightarrow 2 \mathrm{NO}_{2} 4 \mathrm{NH}_{3}+5 \mathrm{O}_{2} \rightarrow 4 \mathrm{NO}+6 \mathrm{H}_{2} \mathrm{O}See Answer
Q13: 1. Calculate the maximum number of electrons with principal quantum number; а) 1 b) 2 c) 3 d) 4See Answer
Q14: Covalent substances can be simple molecular covalent or giant covalent. Oxygen, O2, is also a simple molecular, covalent substance. Draw a dot and cross diagram for the molecule of oxygen.See Answer
Q15: The sodium ion and the neon atom are iso electronic (have the same electron configuration). (8 marks – 4 marks each) Write the electron configuration for the sodium ion and neon atom. b) Describe and explain the similarities and differences in the properties of these two chemical entities.See Answer
Q16: A student set up the apparatus shown in Figure 4 to obtain pure water from sea water by distillation. (i) Explain how the water in sea water separates to produce the pure water in this apparatus. (ii) Explain how the apparatus could be improved to increase the amount of pure water collected from the same volume of sea water.See Answer
Q17: Which of the following substances will be a solid at 20 °C and will melt when placed in a beaker of hot water at 80 °C? See Answer
Q18: The concentration of dilute sulfuric acid can be determined by titration with sodium hydroxide solution of known concentration. 25.00 cm of dilute sulfuric acid was measured out using a pipette and transferred to a conical flask. A few drops of methyl orange indicator were added to the acid in the conical flask. Sodium hydroxidesolution was added to the acid from a burette until the indicator changed colour. The titration was repeated until two concordant results were obtained. The accurate result was the average of the two concordant results. A brief report of the practical method has been given above. Further detail can be added to this method to ensure that anyone following the method will obtain anaccurate result. Explain two details that could be added to this practical method to ensure an accurate result is obtained.See Answer

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