Recent questions in Chemistry

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Identify the following cleansing agents

asked Jul 7, 2021 in Chemistry Form 4 by anony mous

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A gaseous compound consists of 86% carbon and 14% hydrogen by mass. At s.t.p, 3.2dm3 of the compound has a mass of 6g. (C = 12 H = 1 molar gas volume at s.t.p = 22.4dm3)

asked Jul 7, 2021 in Chemistry Form 3 by anony mous

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Using dots (•) and crosses (x) show bonding in; (C = 2, 0 = 16, H = 1)

asked Jul 7, 2021 in Chemistry Form 2 by anony mous

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The table below shows the pH values of solution J to N

asked Jul 7, 2021 in Chemistry Form 4 by anony mous

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Study the experimental set up of apparatus shown below.

asked Jul 7, 2021 in Chemistry Form 2 by anony mous

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A white solid L changes to yellow solid R when strongly heated but on cooling becomes white again. When L is reacted with dilute nitric(v) acid effervescence occurs.

asked Jul 7, 2021 in Chemistry Form 4 by anony mous

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The standard reduction potentials of two half cells are

asked Jul 7, 2021 in Chemistry Form 4 by anony mous

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Nitrogen reacts with oxygen according to the equation.

asked Jul 7, 2021 in Chemistry Form 3 by anony mous

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An aqueous solution of hydrogen chloride can be prepared as shown in the diagram below.

asked Jul 7, 2021 in Chemistry Form 3 by anony mous

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The following elements belong to the same group of periodic table.

asked Jul 7, 2021 in Chemistry Form 2 by anony mous

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Describe how you would prepare dry sample of lead (II) chloride starting with lead (II) carbonate.

asked Jul 7, 2021 in Chemistry Form 4 by anony mous

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The table below gives some experimental results on four samples of water. Use the information to answer the questions that follow.

asked Jul 7, 2021 in Chemistry Form 4 by anony mous

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The lattice energy of sodium bromide and hydration energies of sodium and bromide ions are 733,406 and 335kj/mol respectively.

asked Jul 7, 2021 in Chemistry Form 4 by anony mous

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2 answers

Define molar heat solution.

asked Jul 7, 2021 in Chemistry Form 4 by anony mous

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70g of salt W were added to 80cm3 of water at 25°C. After stirring 10g of crystals of salt were filtered out. Determine the solubility of salt W at 25°C.

asked Jul 7, 2021 in Chemistry Form 2 by anony mous

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An element has isotopic species A and B each with a mass number 39 and 40 respectively. The percentage of A is 60% and B is 40% for an isotopic element X. Calculate the relative atomics mass of X.

asked Jul 7, 2021 in Chemistry Form 2 by anony mous

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The atomic number of element A is 11 and that of B is 8

asked Jul 7, 2021 in Chemistry Form 2 by anony mous

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State the process that takes place when;

asked Jul 7, 2021 in Chemistry Form 4 by anony mous

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An ore is suspected to contain mainly sodium. Describe a method that can be used to confirm the presence of sodium in the ore.

asked Jul 5, 2021 in Chemistry Form 4 by anonymous

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Sodium is extracted from its ore by the electrolysis process. Name the chief ore from which sodium is extracted from.

asked Jul 5, 2021 in Chemistry Form 4 by anonymous

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