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Elements X and Y have atomic numbers 11 and 17 respectively. Which one of the elements is a metal? Give a reason for your answer.

asked Aug 5, 2021 in Chemistry Form 2 by anonymous

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1 answer

An element B consists of three isotopes of mass, 28, 29 and 30 and percentage abundances of 92.2, 4.7 and 3.1 respectively. Show that the relative atomic mass of element is 28.11

asked Aug 5, 2021 in Chemistry Form 2 by anonymous

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A ball rolls off a platform of height 1.8m at a horizontal speed of 15 ms−1. How far off the edge of the platform does it land?

asked Aug 5, 2021 in Physics Form 3 by anony mous

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1 answer

An element, A, has 30 protons and 35 neutrons. What is

asked Aug 5, 2021 in Chemistry Form 2 by anonymous

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Element X has two isotopes. Two thirds of 3316X and one-third 3016X. What is the relative mass of element X?

asked Aug 5, 2021 in Chemistry Form 1 by anonymous

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1 answer

The following figure shows velocity –time graph for the journey of a car in 100minutes.

asked Aug 5, 2021 in Physics Form 3 by anony mous

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1 answer

Give an industrial application of sublimation

asked Aug 5, 2021 in Chemistry Form 1 by anonymous

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3 answers

Name two other substances that behave as dry ice

asked Aug 5, 2021 in Chemistry Form 2 by anonymous

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1 answer

A force of 2.0N compresses a spring by 1.0mm. Determine the energy stored in the spring

asked Aug 5, 2021 in Physics Form 2 by anony mous

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1 answer

Carbon (IV) sublimes at -78ºC. It is called dry ice

asked Aug 5, 2021 in Chemistry Form 2 by anonymous

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1 answer

State two situations where redox reactions are applied in industry

asked Aug 5, 2021 in Chemistry Form 1 by anonymous

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A stone is tied to a string and whirled in a horizontal circle at a constant speed. In which direction is the stone being accelerated at each point of its path?

asked Aug 5, 2021 in Physics Form 4 by anony mous

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1 answer

Observe the equation below

asked Aug 5, 2021 in Chemistry Form 1 by anonymous

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State two similarities between rusting and combustion

asked Aug 5, 2021 in Chemistry Form 1 by anonymous

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Moist iron wool was inverted over water. The set up was left to stand for 2 days

asked Aug 5, 2021 in Chemistry Form 1 by anonymous

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The diagram below shows two identical iron rods, one is placed on a wooden block and the other on a metal block. The ends of the rods are heated as shown.

asked Aug 5, 2021 in Physics Form 1 by anony mous

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The table below shows some properties and electronic arrangements of common ions of elements represented by letters P to X. Study the information in the table and answer the questions that follow

asked Aug 5, 2021 in Chemistry Form 1 by anonymous

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1 answer

A force of 3500N acts on a stationary body of mass 20kg for 0.02 seconds. Calculate the velocity attained by the body

asked Aug 5, 2021 in Physics Form 3 by anony mous

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In an experiment, a test-tube full of chlorine water was inverted in chlorine water as shown in the diagram below and the set up left in sunlight for one day.

asked Aug 5, 2021 in Chemistry Form 1 by anonymous

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1 answer

The curve below represents the variation of temperature with time when pure and impure samples of a solid were heated separately.

asked Aug 5, 2021 in Chemistry Form 1 by anonymous

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