Recent questions without a selected answer

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State the difference between a covalent bond and a dative covalent bond.

asked Jun 21, 2021 in Chemistry Form 2 by anony mous

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Figure 6 shows a graph of stopping potential against the frequency for a certain photo emissive surface, drawn by a student from the data collected when carrying out an experiment on photoelectric effect.

asked Jun 21, 2021 in Physics Form 4 by anonymous

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Draw a labelled diagram of the setup of apparatus that can be used to electrolyse lead (ll) bromide.

asked Jun 21, 2021 in Chemistry Form 4 by anony mous

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State one difference between the deflection systems of a cathode ray tube and the television tube.

asked Jun 21, 2021 in Physics Form 4 by anonymous

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Name the three components of the electron gun in a cathode ray tube.

asked Jun 21, 2021 in Physics Form 4 by anonymous

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The table shows pH values of solutions of compounds D, E. F and G

asked Jun 21, 2021 in Chemistry Form 3 by anony mous

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The half life of a certain radioactive substance is 24 days. Given that the initial sample of the substance has a mass of 64 g, determine the mass which is left after 72 days.

asked Jun 21, 2021 in Physics Form 4 by anonymous

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Arrange the following electromagnetic waves in the order of decreasing frequency: Microwaves; Gamma rays; Radiowaves; X-rays.

asked Jun 21, 2021 in Physics Form 4 by anonymous

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Figure 5 shows a radioactive element placed in an evacuated glass chamber. The element produces alpha, beta and gamma emissions.

asked Jun 21, 2021 in Physics Form 4 by anonymous

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Draw the structural formula of 2-methylbut-2-ene.

asked Jun 21, 2021 in Chemistry Form 3 by anony mous

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The following is a nuclear reaction equation: 63Li+10n →31H +xyP Determine the values of x and y.

asked Jun 21, 2021 in Physics Form 4 by anonymous

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State two uses of radioactivity in medicine.

asked Jun 21, 2021 in Physics Form 4 by anonymous

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An object of height 10 cm is placed 30 cm from a converging lens of focal length 18 cm.

asked Jun 21, 2021 in Physics Form 2 by anonymous

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An object is placed 8cm from a concave mirror whose radius of curvature is 20cm. Determine the position of the image.

asked Jun 21, 2021 in Physics Form 2 by anonymous

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Carbon(II) oxide was passed over 4.1g of heated oxide of copper in a combustion tube until there was no further change. The mass of the final substance was found to be 3.29g

asked Jun 21, 2021 in Chemistry Form 3 by anony mous

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Describe how the focal length of a concave mirror can be determined using a screen and a metre rule.

asked Jun 21, 2021 in Physics Form 2 by anonymous

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A consumer has the following appliances in the house:

asked Jun 21, 2021 in Physics Form 4 by anonymous

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State and explain the factors that are considered when collecting a gas by displacement of

asked Jun 21, 2021 in Chemistry Form 1 by anony mous

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An electric cooker is rated 2.5 kW, 250 V. State the meaning of these values

asked Jun 21, 2021 in Physics Form 4 by anonymous

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State two ways of minimising power losses during the transmission of electric power.

asked Jun 21, 2021 in Physics Form 1 by anonymous

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