a) Write a nuclear equation for the decay process of carbon -14.
b) From the graph, determine the; i) Half-life of carbon -14; ii) Percentage of carbon -14 in a sample whose age is 1950 years.
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The pressure of nitrogen gas contained in a 1dm3 cylinder at -196°C was 107 Pascals.
Calculate the: a) Volume of the gas at 25°C and 105 Pascals. b) Mass of nitrogen gas(Molar volume of gas is 24dm3, N = 14.0)
Complete the table below by writing the product formed at the electrodes during the electrolysis of the electrolytes given in the table.
Aluminium oxide reacts with both acids and bases.
a) Write an equation for the reaction between aluminium oxide and hydrochloric acid. b) Using the equation in (a) above, calculate the number of moles of hydrochloric acid that would react completely with 153.0g of aluminium oxide. (AL = 27.0, 0= 16.0)
Hydrate cobalt(II) chloride exists as pink crystals and anhydrous cobalt(II) chloride is a blue powder. Describe a laboratory experiment that can be used to show that the action of heat on hydrated cobalt(II) chloride is a reversible reaction.
Draw the structures and give the name of the three alkaline having molecular formula C5H10
What is the name given to each of the following:
a) What is meant by the terms: i. element ii. atomic number
b) The formula for a chloride of titanium is TiCl3. What is the formua of its sulphate?
ANSWERS
(i) Element — substance that consists of one type of atoms.
(ii) Atomic number — number of protons in an atom. Ti3(S04)2
a) Distinguish between a deliquescent and a hygroscopic substance.
b) Give one use of hygroscopic substance in the laboratory.
ANSWERS
(a)Deliquescent - a substance that absorbs water from the atmosphere and changes into a solution.
Hygroscopic — a substance that absorbs water from the atmosphere but just becomes wet. (b)drying agent. |
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