1. Which of the following has a positive charge? 2. How many electrons are there in the valence shell of the O2– ion? 3. What is the formula of the compound formed between magnesium and oxygen? 4. Which one of the following statements concerning elements in the Periodic Table is correct? 5. Which one of the following species has the same electron configuration as Al3+ cation?
1) When a little quantity of ethanol (b. pt 78 0C) was dissolved in large quantity of water (b.pt 100 0C) , the most likely boiling point of the mixture is between A. 89-90 0C B. 103-1070C C. 78-100 0C D. 80-96 0C 2) Chromatography is a method of separation based on A. the different speed of the components B. the ability of the components to react with each other C. the ability of the components to repel each other D. the absorption of the components into each other 3) A compound on analysis ...
1. Which of the following has a positive charge? (A) proton (B) neutron (C) anion (D) electron ANS = A 2. How many electrons are there in the valence shell of the O2– ion? A 2 B 8 C 10 D 16 ANS = B 3. What is the formula of the compound formed between magnesium and oxygen? A MgO B Mg2O2 C Mg2O3 D MgO2 ANS = A 3. Which one of the following statements concerning elements in the Periodic Table is correct? A Elements of the same group all have the same number of electrons in the outermost o...
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1. Which of the following has a positive charge? (A) proton (B) neutron (C) anion (D) electron ANS = A 2. How many electrons are there in the valence shell of the O2– ion? A 2 B 8 C 10 D 16 ANS = B 3. What is the formula of the compound formed between magnesium and oxygen? A MgO B Mg2O2 C Mg2O3...
What is the shape of a molecule of CCl4? A. Pyramid B. tetrahedral C. Trigonal planar D. linear ANSWER: B Which of the following increases as boiling water changes to steam? A. Temperature of the system B. degree of disorder of the system C. number of molecules D. Activation energy ANSWER: B Which of the following has a positive charge? A. proton B. neutron C. anion D. electron ANSWER: A Which of the responses contains all the statements that are consistent with the Bohr theory ...
1) When a little quantity of ethanol (b. pt 78 0C) was dissolved in large quantity of water (b.pt 100 0C) , the most likely boiling point of the mixture is between A. 89-90 0C B. 103-1070C C. 78-100 0C D. 80-96 0C 2) Chromatography is a method of separation based on A. the different speed of the components B. the ability of the components to react with each other C. the ability of the components to repel each other D. the absorption of the components into each other 3) A compound on analysis ...
1. Which of the following has a positive charge? (A) proton (B) neutron (C) anion (D) electron ANS = A 2. How many electrons are there in the valence shell of the O2–ion? A 2 B 8 C 10 D 16 3. What is the formula of the compound formed between magnesium and oxygen? A MgO B Mg2O2 C Mg2O3 D MgO2 3. Which one of the following statements concerning elements in the Periodic Table is correct? A Elements of the same group all have the same number of electrons in the outermost occupied electr...
1(a) Differentiate between the following (i) Fractional distillation and simple distillation (ii) Filtration and decantation (iii) Sublimation and evaporation (b) Given a mixture of sodium chloride, ammonium chloride and sand, explain how you will go about separating the mixture to obtain each component in the pure form
1. In IUPAC nomenclature the parent chain is determined by the number of carbon atoms in_______ (a) a straight chain (b) the longest continous carbon atom (c) the side chain (d) the substituents 2. Cis-alkenes are obtained by hydrogenation of alkynes with _____ catalyst (a) hydration (b) Lindlar (c) Tollen's (d) Vicinal. 3. The following are examples of addition reactions of alkenes EXCEPT (a) hydration (b) hydrohalogenation (c) ozonolysis (d) hydrogenation 4. Addition of HBr to propene in th...
INSTRUCTIONS: (a) Attempt all questions (b) Write the correct answers only (c) Constants: 1nm = 10-9m, h=6.625 x 10-34Js and c = 3 x 108m/s, R = 3.289 x 1015Hz (d) H = 1, C= 12, O= 16, Na = 23, N=14, Ca=40, Cl=35.5 1. Write a balanced equation for tetraoxosulphate (vi) acid and sodium hydroxide 2. 25cm3 of hydrochloric acid was titrated against 20cm3 of sodium hydroxide solution that contains 2.30g in 250cm3. Calculate the concentration of the acid in mole/dm3 3. Calculate (i) Concentration o...
CHEM 102 Past Questions Compressed
1. Methyl ethyl ether can be represented by ________________________ a. CH3CH2COOCH b. CH3COCHOCH3 c. CH3CH2COCH3 d. CH3OCCH3 2. Butan-1-ol will react with PCl5 to give an effervescence of ___________________________ a. water b. hydrogen chloride c. butanal d. butanol 3. H3C C=O NH2NH2 n(CH3)2C=NNH2 a. (CH3)2C=NOH b. (CH3)2C=NNH2 c. (CH3)2C-NOH H3C ...
FACULTY OF SCIENCE DEPARTMENT OF CHEMISTRY 2017/2018 FIRST SEMESTER EXAMINATION