Free NECO 2024 Chemistry Practical Alternative A + B Questions and Answers were given out in a free live EXPO Room on the 13th July, 2024. You can get them for yourself: NECO June/July Chemistry (Practicals) Questions and Answers.
CHEMISTRY PRACTICALS (CHEM) FREE QUESTION AND ANSWER ROOM AT NECO MAY/JUNE 2024
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Thursday, 13th July
Table of Contents
Practical Chemistry (Chemistry)
10:00 a.m. to 12:00 p.m.
PRACTICAL ANSWERS FOR NECO CHEMISTRY 2024 [13TH JULY 2024]
| Burette Reading (cm³) | Rough | Titration I | Titration II |
|---|---|---|---|
| Final Reading (cm³) | 21.50 | 43.00 | 22.00 |
| Initial Reading (cm³) | 0.00 | 21.50 | 00.00 |
| Volume of A used (cm³) | 21.50 | 21.50 | 22.00 |
NECO Chemistry Practicals
| 2a. Tests for Solution C | |
|---|---|
| a. i. TEST | =TEST= |
| Reaction | C + heat |
| OBSERVATION | =OBSERVATION= |
| Observation | Formation of yellow flame |
| INFERENCE | =INFERENCE= |
| Inference | Na⁺ present |
| 2a. ii. TEST | =TEST= |
| Reaction | C + distilled water + shake |
| OBSERVATION | =OBSERVATION= |
| Observation | It readily dissolves in water |
| INFERENCE | =INFERENCE= |
| Inference | C is soluble in water |
| 2a. iii. TEST | =TEST= |
| Reaction | Solution C + litmus paper |
| OBSERVATION | =OBSERVATION= |
| Observation | It changes moist red litmus to blue and no effect on blue |
| INFERENCE | =INFERENCE= |
| Inference | Solution C is alkaline |
| 2b. i. TEST | =TEST= |
| Reaction | 1st portion of solution C + barium chloride |
| OBSERVATION | =OBSERVATION= |
| Observation | White precipitate formed |
| INFERENCE | =INFERENCE= |
| Inference | CO₃²⁻, SO₄²⁻, S²⁻, or SO₃²⁻ present |
| 2b. ii. TEST | =TEST= |
| Reaction | Add dilute HCl to product in (bi) |
| OBSERVATION | =OBSERVATION= |
| Observation | White precipitate dissolves |
| INFERENCE | =INFERENCE= |
| Inference | CO₃²⁻, SO₃²⁻, or S₃²⁻ present |
| 2b. iii. TEST | =TEST= |
| Reaction | To the second portion, add phenolphthalein |
| OBSERVATION | =OBSERVATION= |
| Observation | Purple color observed |
| INFERENCE | =INFERENCE= |
| Inference | C is alkaline |
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NECO Chemistry Answers 2023-2024
Question 1
1a) Types of Carbon (i) Diamond (ii) Graphite
1aii) Types of Coal (i) Coal (ii) Coke
1aiii) Periodic Law (i) Elements with similar properties recur at regular intervals or periods. (ii) The properties of elements are a periodic function of their atomic numbers.
1b) Explanation of Periodicity (i) Periodicity refers to the variation of the properties of elements in a regular pattern both down the groups and across the periods. (ii) To find the number of atoms in 0.5 moles of oxygen, multiply the Avogadro's number (6.023 x 10^23) by 0.5.
1ci) Faraday’s First Law of Electrolysis The mass of an element discharged during electrolysis is directly proportional to the quantity of electricity passing through it.
1cii) Calculation To find the volume of oxygen liberated at standard temperature and pressure (s.t.p), divide the number of moles by 22.4.
1di) Electrolysis Reactions (i) Cathodic half cell reaction: 4H+(aq) + 4e- ---> 2H2(g) (ii) Anodic half cell reaction: 4OH-(aq) ---> 2H2O(l) + O2(g) + 4e-
1dii) Types of Substances (i) Electrolyte: Tetraoxosulphate(IV) acid (ii) Non-electrolyte: Ester, Phenol
1ei) Identification Mercury
1eii) Atomic Structure (i) Number of electrons = 16 (ii) Mass number = 34 (iii) Element: Sulphur
Question 2
2ai) Acid Basicity The basicity of an acid is the number of replaceable hydrogen ions in one molecule of the acid.
2aii) Examples (i) H3PO4 ---> basicity = 3 (ii) HC2H3O2 ---> basicity = 1 (iii) H2SO4 ---> basicity = 2
2bi) Factors Affecting Reaction Rate Temperature, pressure, and concentration are factors affecting the rate of a reaction.
2bii) Other Factors Nature of reactants, concentration/pressure, and surface area also affect reaction rate.
2ci) Omitted
2di) Reactions and Uses (i) Evolution of hydrogen gas and heat (ii) Decolourization of purple KMnO4 with sulphur deposition (iii) Formation of a black residue due to dehydration (iv) Uses: Immediate energy source, manufacture of sweets
Question 3
3ai) Chlorine Reaction Equation: Cl2(g) + 2NaOH(aq) ---> NaCl + H2O(l) Observation: Green to Brown
3bi) Uses of Hard Water (i) Enhanced taste due to dissolved minerals (ii) Shell formation aid for snails and crabs
3bii) Sources of Pollution (i) Power plants and vehicle exhaust (ii) Chemical warfare gases
3biii) Identification Tests Starch: Iodine test Fats and oil: Sudan III test
3ci) Challenges in Standard Preparation Deliquescence of NaOH and hygroscopic nature of Na2SO4 hinder accurate preparation.
3cii) Naming of Compounds Examples of named compounds
3d) Boyle's Law Application Volume at 50°C = 426.4cm^3
Question 4 (typing...)
Note: Answers provided are based on the given questions and are subject to verification.
NECO Chemistry Practicals (CHEM PRAT): FAQs
Q1: What is the NECO Chemistry Practicals (CHEM PRAT) examination?
A1: The NECO Chemistry Practicals (CHEM PRAT) examination is a practical assessment conducted by the National Examination Council (NECO) for students taking the Chemistry subject. It is designed to test the practical skills and knowledge of candidates in various aspects of Chemistry.
Q2: How is the NECO Chemistry Practicals (CHEM PRAT) examination structured?
A2: The NECO Chemistry Practicals (CHEM PRAT) examination consists of practical tasks and experiments that candidates are required to perform. These practical tasks are based on the Chemistry syllabus and cover topics such as qualitative analysis, quantitative analysis, organic chemistry, inorganic chemistry, and physical chemistry.
Q3: How long does the NECO Chemistry Practicals (CHEM PRAT) examination last?
A3: The NECO Chemistry Practicals (CHEM PRAT) examination typically lasts for a duration of about 2 to 3 hours, depending on the specific tasks and experiments assigned.
Q4: What are the equipment and materials required for the NECO Chemistry Practicals (CHEM PRAT) examination?
A4: Candidates are expected to come prepared with necessary laboratory equipment and materials, including but not limited to test tubes, beakers, pipettes, burettes, reagents, chemicals, and safety equipment such as goggles and lab coats. A detailed list of required equipment and materials is usually provided by the NECO examination board.
Q5: How are the NECO Chemistry Practicals (CHEM PRAT) examination results graded?
A5: The NECO Chemistry Practicals (CHEM PRAT) examination results are graded based on the accuracy and precision of the practical tasks performed by candidates. The examination board assesses the quality of experimental techniques, observation skills, data recording, and interpretation of results. The grading system typically ranges from A (Excellent) to F (Fail).
Q6: How can I prepare for the NECO Chemistry Practicals (CHEM PRAT) examination?
A6: To prepare for the NECO Chemistry Practicals (CHEM PRAT) examination, it is important to thoroughly study the Chemistry syllabus, understand the concepts, and practice performing various practical tasks. Familiarize yourself with laboratory equipment and procedures, and review past examination questions to gain an understanding of the format and types of experiments that may be encountered.
Q7: Are there any specific tips for success in the NECO Chemistry Practicals (CHEM PRAT) examination?
A7: Yes, here are some tips for success in the NECO Chemistry Practicals (CHEM PRAT) examination:
- Read and follow instructions carefully.
- Practice good laboratory techniques and safety precautions.
- Pay attention to details and make accurate observations.
- Record experimental data accurately and neatly.
- Interpret and analyze results effectively.
- Review and revise key concepts and experimental procedures.
Q8: When is the NECO Chemistry Practicals (CHEM PRAT) examination usually conducted?
A8: The NECO Chemistry Practicals (CHEM PRAT) examination is usually conducted as part of the NECO Senior School Certificate Examination (SSCE) for students in their final year of senior secondary school. The specific date and time for the examination are determined by the NECO examination board and communicated to schools in advance.
Q9: Can I use calculators or other electronic devices during the NECO Chemistry Practicals (CHEM PRAT) examination?
A9: The use of calculators or any other electronic devices is generally not allowed during the NECO Chemistry Practicals (CHEM PRAT) examination. Candidates are expected to rely on their knowledge and understanding of Chemistry principles and perform calculations manually, where necessary.
Q10: How can I obtain further information about the NECO Chemistry Practicals (CHEM PRAT) examination?
A10: For further information about the NECO Chemistry Practicals (CHEM PRAT) examination, it is advisable to consult the official NECO website (www.neco.gov.ng) or contact the NECO examination board directly for accurate and up-to-date information.