A standard resistor of resistance 2 Ω is connected in the left gap of the metre bridge and a length l1 of wire W1 is connected across the right gap of the bridge as shown in the diagram above. The balance point B is determined by touching the metre wire with the jockey. The balance length
A concave mirror is placed on the base of a retort stand and a pin, P, is held horizontally above the mirror as shown in the diagram above. The position of P is varied until its image in the mirror when viewed vertically downwards, coincides with it. The distance, d, between the image and the
A test tube is weighed and its mass mo = 20 g is recorded. It is then loaded with sufficient lead shots so that it floats vertically in a beaker of water as shown in the diagram above. The depth, d, of immersion of the test tube and content is measured and recorded The test
Outline how a 250 cm3 of 0.100 moldm-3 HCl could be prepared from 100 cm3 of a 2.00 moldm-3 stock solution. State the effect of aqueous solutions of each of the following salts on litmus paper:(i) CH3COONa;(ii) Al2(SO4)3;(iii) KNO3. (c) In a redox titration experiment, acidified potassium tetraoxomanganate (VII) [KMnO4] solution was titrated against Fe2+
A is a simple salt. The following tests were carried out on A. complete the following table. (b)(i) Name the salt A.(ii) Write the formula of A. The following tests were carried out on a sample of an unsaturated alkanol K. Complete the following table. Observation Majority of the candidates responded to this question. In
1. E was prepared by dissolving 33.60 g of a mixture of FeSO4. 7H2O and NaCl to make 1.0 dm3 solution.. F was 0.0200 moldm-3 KMnO4. 25 cm3 of E was pipetted into a conical flask acidified with 20.0 cm3 of dil. H2SO4 and titrated with F. The results are recorded in the table below.
A is a solution of potassium tetraoxomanganate (VII). B is a solution of iron(II)chloride containing 4.80 g of the salt in 250 cm3 of solution. Put A into the burette. Pipette 20.0 cm3 or 25.0 cm3 of B into a conical flask, add 20.0 cm3 of H2SO4 (aq) and titrate with A. Repeat the
(i) Define the term solubility. (ii) If 1.11g of calcium chloride (CaCl2) were dissolved in 20.0g of distilled water at 20oC, calculate the solubility of the salt in moldm-3. [Ca 40.0, Cl 35.5]. (i) Solubility of a solute in a solvent at a particular temperature is the maximum amount of the solute in moles or
State two advantages of synthetic polymers over natural polymers. The expected answers include: – cheaper– more durable– can be recycled– easily moulded– lighter– can be made on demand / tailor made– easily available– can be produced in larger quantity– can be formed fasterDraw the structure of the product formed when one mole of ethyne reacts
The table below shows the composition of exports and imports of a hypothetical country. Use the information in the table to answer the questions that follow. Exports Amount $ Imports Amount $ Crude oil 120,000,000 Rice and flour 140,000,000 Groundnuts 40,000,000 Petroleum product 80,000,000 Tourism 45,000,000 Vehicles and accessories 50,000,000 Shipping & Insurance 60,000,000