WAEC GCE Chemistry past questions and answers PDF available
WAEC GCE Chemistry past questions and answers PDF available
Preparing for the WAEC GCE Chemistry exam? If you want to succeed in the WAEC GCE Chemistry free past questions, you should start to practice your WAEC GCE Chemistry past questions and answers. Exam format, frequently asked questions, and the type of answers to expect are also provided in these resources. This guide provides everything you need to know about WAEC GCE Chemistry previous question format and learn more about how to maximize your preparation.
In this post, you will get full access to WAEC GCE Chemistry past questions, how to apply the past questions in your preparation, and a preparatory guide for your exam success.
Advantages of Using WAEC GCE Chemistry Past Questions
Looking at past questions is a major benefit of studying. Here’s why:
Familiarize with Exam Pattern: Old questions help learners understand the nature of the questions and the format of the WAEC GCE Chemistry exam.
Identify Repeated Questions: Candidates also noted that WAEC sometimes reproduces the questions from the previous years or reproduces a similar question type. These practices help you prepare for the familiar content that may come.
Improves Answer Accuracy: They bring knowledge of structuring the answers in a manner that corresponds to WAEC written examinations, which enhances the student grasp of the exam.
Boosts Confidence: Practice makes you less stressed about the examinations and makes you feel more comfortable when you are sitting for the examination.
Step-by-step solutions to 2007 WAEC GCE Chemistry Past Questions for Free Reading
Answer three questions from this section.
1 (a) Define the following terms:
(i) saturated solution;
(ii) solubility. [4 marks]
(b) In an experiment to determine the solubility of a given salt Y, the following data were provided:
- Mass of dry empty dish = 7.16 g
- Mass of dish + saturated solution of salt Y = 17.85 g
- Mass of dish + salt Y = 9.30 g
- Temperature of solution = 20°C
- Molar mass of salt Y = 100
Density of solution Y = 100 g dm(^{-3})
Calculate the solubility of salt Y in:
(i) g dm(^{-3}) of solution, [6 marks]
(ii) mol dm(^{-3}) [6 marks]
(c) State the type of bond broken on melting each of the following substances:
(i) NaCl;
(ii) CO(_2). [3 marks]
(d) Explain the following observations:
(i) The chemical reactivity of alkali metals increases down the group; [4 marks]
(ii) Mg has a higher melting point than Na; [4 marks]
(iii) K is a better reducing agent than Na. [6 marks]
(e) (i) Lithium exists as (_3^6Li) and (_3^7Li) in the ratio 2:25. Calculate the relative atomic mass of the lithium. [5 marks]
(ii) What are isotopes? [2 marks]
2 (a) Define the following in terms of electron transfer:
(i) oxidation;
(ii) reduction. [2 marks]
(b)(i) Determine the oxidation state of phosphorus in each of the following structures:
- POCl(_3)
- Li(_3)P
- PH(_3). [6 marks]
(ii) State which of the following compounds will form acidic, neutral, or basic aqueous solutions:
- 1. NaNO(_3)
- 2. NH(_4)Cl
- 3. Li(_2)CO(_3). [10 marks]
(c) Consider the setup:
(i) What is the gas produced in the experiment illustrated by the setup above? [2 marks]
(ii) Name the method of collection of the gas. [1 mark]
(iii) Give a reason for your answer in 2(c)(ii) above. [1 mark]
(iv) State the function of the concentrated H(_2)SO(_4) in the conical flask. [1 mark]
(v) Give one:
- physical property,
- chemical property of the gas. [2 marks]
(vi) State one chemical test to identify the gas. [2 marks]
(d) A 4.39g hydrated sodium tetraoxosulphate(VI) (Na(_2)SO(_4), xH(_2)O) was heated to remove the water of crystallization. The remaining anhydrous salt had a mass of 2.12g. Calculate the value of x in the hydrated salt. [H = 1; O = 16; Na = 23; S = 32] [5 marks]
3 (a) (i) What is a homologous series?
(ii) Give two homologous series present in petroleum.
(iii) Give one example of a compound belonging to each of the homologous series in 3(a)(ii).
(iv) Name two fractions obtained from the fractional distillation of petroleum. [6 marks]
(b) Why is there a gradual change in the physical properties of petroleum fractions? [10 marks]
(c) (i) Write a two-step balanced chemical equation for the reaction of (i) ethanol with excess concentrated tetraoxosulphate(VI) acid at high temperature:
(ii) excess ethanol with concentrated tetraoxosulphate(VI) acid at lower temperature. [7 marks]
(ii) An analysis was found to contain 52.0% carbon, 13.3% hydrogen, and 34.7% oxygen.
(C) Determine its empirical formula.
II. molecular formula.
(iii) Draw two possible structures of the compound and name one of them. [C = 12; H = 1; O = 16] [9 marks]
4 (a)(i) Write an equation in each case to represent the:
(i) β-decay of ( _{11}^{24}Na ) to give Mg.
(ii) Reaction of sodium with cold water. [4 marks]
(b)(i) State two differences between reaction 4(a)(i) and 4(a)(ii). [3 marks]
(ii) State two applications of the type of reaction represented in 4(a)(i). [4 marks]
(c) Consider the reaction represented by the equation:
( MgCl_2 + 2H_2O → Mg(OH)_2 + H_2 )
(i) Name the type of reaction involved.
(ii) Give two ways by which the reaction could be made faster.
(iii) What volume of hydrogen gas would be produced from 6.0g of magnesium? [H = 1; 1 mole of a gas occupies 22.4 dm(^3) at s.t.p.] [6 marks]
(d) (i) What is (i) anode; (ii) cathode?
(ii) Name the ore of the metal.
(iii) What is the substance discharged at each electrode when dilute NaCl is electrolysed using graphite electrodes?
(iv) Why would solid NaCl not work?
(v) Give one industrial use of NaCl. [7 marks]
Answer one question only from this section.
SECTION II
5(a)(i) What is the name of the process used for the industrial preparation of tetraoxosulphate (VI) acid? [3 marks]
(ii) State the catalyst used in 5(a)(i).
(iii) Show by means of balanced chemical equations only the three stages in the industrial preparation of tetraoxosulphate (VI) acid from sulphur (IV) oxide. [8 marks]
(b)(i) Distinguish between dehydration and drying.
(ii) Explain why concentrated tetraoxosulphate (VI) acid cannot be used to dry ammonia. [7 marks]
(c)(i) Give one example of a chloride which is soluble in hot water.
(ii) List three methods for the preparation of salts.
(iii) State one method for the recovery of a salt from its solution. [7 marks]
(d)(i) State Gay Lussac’s law of combining volumes.
(ii) Consider the reaction represented by the following equation:
[ C_2H_4 + 3O_2 → 2H_2O + 2CO_2 ]
What is the volume of oxygen required for the complete combustion of 12.5cm(^3) of ethene? [5 marks]
6(a)(i) Draw and label an energy profile diagram for an endothermic reaction. Indicate on your diagram:
I. Activation energy,
II. Heat change. [8 marks]
(ii) Explain how the rate of reaction is affected by
I. addition of a catalyst,
II. increase in temperature. [8 marks]
(b)(i) Write an equation for the thermal decomposition of calcium trioxocarbonate (IV).
(ii) Determine the volume of carbon (IV) oxide measured at s.t.p. that would be produced by complete thermal decomposition of 10g calcium trioxocarbonate (IV). [M(_r) (Ca = 40; O = 16; C = 12] [5 marks]
(c)(i) Give one use of each of the following forms of carbon:
I. coal;
II. wood charcoal;
III. carbon (IV) oxide. [6 marks]
(ii) Write a balanced chemical equation to show what happens when each of the following compounds is heated strongly:
I. NaNO(_3);
II. MgCO(_3). [5 marks]
(d) Consider the following compounds CaO, CaCO(_3), Ca(OH)(_2), NaOH. Which of them is:
(i) Used in the manufacture of cement;
(ii) Used for the presence of carbon (IV) oxide;
(iii) Used to liberate carbon (IV) oxide when dilute acid is added;
(iv) Hygroscopic;
(v) Ejective agent? [5 marks]
Ways to Ensure You Get the Best Out of WAEC GCE Chemistry Past Questions
To maximize your results with past questions, keep these strategies in mind:
Study Early: Do not cram; approach your revision early enough so that you can have enough time to revise all that you have learned throughout the year.
Simulate Exam Conditions: This is good for practice when you want to create timed conditions to learn how to manage your time best.
Review Your Answers: One should always try to review the responses to see where they went wrong.
Focus on Difficult Topics: If there are some topics that you feel are very difficult, be sure to devote more time to improving your level of understanding and your ability to solve problems related to them.
Practice Writing Structured Answers: It is advisable to organize your responses in the actual examination format in order to get more accurate.
FAQs on WAEC GCE Chemistry Past Questions and Answers
- Are WAEC GCE Chemistry past questions free?
Yes, you can always come or visit this website or platform to read any exam past questions with detailed answers for free. However, if you are interested in downloading the exam past questions and answers, the cost is $3,000 for nine subjects (arts, science, and commercial). For more detail on how to download it, contact admin. on WhatsApp: 09061221656. - Do the previous questions ensure success?
Although to some extent past questions are valuable, such sources should be used in conjunction with the study of textbooks and guides in order to stand a better chance of preparing adequately. - In such cases, do I have to prepare to be greeted by the exact questions in my exam?
The paper is made up of consecutive questions, but similar questions are usually asked over and over again, which is why the solution to past questions or papers is always very helpful. - How Can I Join WAEC GCE Chemistry Past Questions and Answers Reading Class?Â
You can join our thousands of students reading WAEC GCE Chemistry past questions and answers on a daily basis. Join our WhatsApp channel or group here and our Telegram channel or group here. - How frequently does topic repeat in conducted WAEC GCE Civic Education examinations?Â
  When you go through WAEC GCE Chemistry past questions and answers, you will easily see these repeat topics. - When should I begin to study WAEC GCE Chemistry past questions and answers?Â
When you are to begin with your preparation toward the desired exam, it should begin at least 3-6 months before the examination. This way, it gives you enough time to go through WAEC Chemistry past questions and answers comfortably, assimilate what you have studied, and be able to put into practice what you have learned for the best results.
ALSO READ: WAEC GCE Past Questions and Answers PDF Download
Conclusion
One of the best approaches to getting good results is to spend time practicing with the WAEC GCE Chemistry past questions and answers. If you read the structure of the exam, focus on the major points, and practice continually, you’ll be well-prepared to perform well in your exam. Please always come here or visit this website or platform to read any exam past questions with detailed answers for free and begin to study smarter for your WAEC GCE Chemistry Exam!
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