topic 3 exam questions AND ANSWERS
1. A technician located a few colourless crystals of a substance left, unlabelled, in a beaker
in a laboratory. She knew the substance was certainly one of potassium sulfate,
potassium iodide, sodium sulfate or sodium iodide. Explain how, the usage of chemical
exams, the technician should find out if the substance left in the beaker become
potassium sulfate, potassium iodide, sodium sulfate or sodium iodide. You may
additionally include equations in your solution. - ANSWER-Because sodium and
potassium are cations a flame take a look at may be used to differentiate among
the 2. The crystals of each substance must be introduced to a bunsen burner
using a spatula at the same time as it's far on the roaring flame. If the flame turns
yellow this means that there are sodium ions gift so the crystal will both be
sodium sulfate or sodium iodide. If the flame turns lilac which means that there
are potassium ions gift so the crystal will either be potassium sulfate or
potassium iodide.
To check for iodide ions, an answer of the crystals must be made in water. Silver
nitrate answer and dilute nitric acid must be added to this answer. If a yellow
precipitate has shaped which means that there are iodide ions gift so the crystal
can be both potassium iodide or sodium iodide however if no precipitate is
fashioned the crystal could both be potassium sulfate of sodium sulfate.
To check for sulfate ions, a solution of the crystals should be made in water.
Barium nitrate and dilute nitric acid must be brought to the answer. If a white
precipitate has formed because of this sulfate ions are gift so the crystal should
both be potassium sulfate or sodium sulfate however if no precipitate has shaped
the crystal will either be sodium iodide or potassium iodide.
2. Copper sulfate answer is the electrolyte used in this electrolysis technique. Explain how
copper sulfate solution conducts strength - ANSWER-Copper sulfate is an ionic
substance as it has been formed where a steel and a non metallic have reacted
and ions were formed as a result of dropping and gaining electrons. When an
ionic substance is melted or dissolved its ions are unfastened to move round
within the liquid or answer.
3. Electrolysis of hydrochloric acid can produce hydrogen and chlorine. The equipment for
the electrolysis is hydrochloric acid, two carbon rods, a suitable box for the electrolysis
reaction, a appropriate supply of strength and check tubes Describe how the equipment
can be used to electrolyse hydrochloric acid and the way the gases produced may be
examined to expose that they're hydrogen and chlorine. - ANSWER-Hydrochloric acid
contains hydrogen ions and chlorine ions. It can be electrolysed. Using the
equipment above, hydrochloric acid need to be poured right into a beaker and the
2 carbon rods should be located into the solution, those are the electrodes. One of
these electrodes ought to be connected to the poor terminal of the dc supply and
the other ought to be attached to the fine terminal. The two test tubes have to be
absolutely filled with the hydrochloric acid and every take a look at tube have to
1. A technician located a few colourless crystals of a substance left, unlabelled, in a beaker
in a laboratory. She knew the substance was certainly one of potassium sulfate,
potassium iodide, sodium sulfate or sodium iodide. Explain how, the usage of chemical
exams, the technician should find out if the substance left in the beaker become
potassium sulfate, potassium iodide, sodium sulfate or sodium iodide. You may
additionally include equations in your solution. - ANSWER-Because sodium and
potassium are cations a flame take a look at may be used to differentiate among
the 2. The crystals of each substance must be introduced to a bunsen burner
using a spatula at the same time as it's far on the roaring flame. If the flame turns
yellow this means that there are sodium ions gift so the crystal will both be
sodium sulfate or sodium iodide. If the flame turns lilac which means that there
are potassium ions gift so the crystal will either be potassium sulfate or
potassium iodide.
To check for iodide ions, an answer of the crystals must be made in water. Silver
nitrate answer and dilute nitric acid must be added to this answer. If a yellow
precipitate has shaped which means that there are iodide ions gift so the crystal
can be both potassium iodide or sodium iodide however if no precipitate is
fashioned the crystal could both be potassium sulfate of sodium sulfate.
To check for sulfate ions, a solution of the crystals should be made in water.
Barium nitrate and dilute nitric acid must be brought to the answer. If a white
precipitate has formed because of this sulfate ions are gift so the crystal should
both be potassium sulfate or sodium sulfate however if no precipitate has shaped
the crystal will either be sodium iodide or potassium iodide.
2. Copper sulfate answer is the electrolyte used in this electrolysis technique. Explain how
copper sulfate solution conducts strength - ANSWER-Copper sulfate is an ionic
substance as it has been formed where a steel and a non metallic have reacted
and ions were formed as a result of dropping and gaining electrons. When an
ionic substance is melted or dissolved its ions are unfastened to move round
within the liquid or answer.
3. Electrolysis of hydrochloric acid can produce hydrogen and chlorine. The equipment for
the electrolysis is hydrochloric acid, two carbon rods, a suitable box for the electrolysis
reaction, a appropriate supply of strength and check tubes Describe how the equipment
can be used to electrolyse hydrochloric acid and the way the gases produced may be
examined to expose that they're hydrogen and chlorine. - ANSWER-Hydrochloric acid
contains hydrogen ions and chlorine ions. It can be electrolysed. Using the
equipment above, hydrochloric acid need to be poured right into a beaker and the
2 carbon rods should be located into the solution, those are the electrodes. One of
these electrodes ought to be connected to the poor terminal of the dc supply and
the other ought to be attached to the fine terminal. The two test tubes have to be
absolutely filled with the hydrochloric acid and every take a look at tube have to
