Chemistry questions with complete solutions

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Exam (elaborations)

Chemistry questions with complete solutions

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2024/2025

Institution CHEMICAL TECHNICIAN 1

Course CHEMICAL TECHNICIAN 1

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Chemistry questions with complete solutions

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Chemistry questions with complete solutions

Suggest a reason, other than apparatus inaccuracy, why the Mr value determined from
c c c c c c c c c c c c

the experimental results differs from the actual Mr. Explain your answer. - answer-The
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cvolume of the gas in syringe is greater than the true volume
c c c c c c c c c c c c

If V is large Mr too small
c c c c c c

Disadvantage of chlorinating water - answer-Wasteful as most potable water not for
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drinking
c

Observation when magnesium and steam - answer-Bright light c c c c c c c

Chlorine reacts with cold, aqueous sodium hydroxide in the manufacture of bleach. -
c c c c c c c c c c c c

answer-Cl2 +2NAOH — NACL +NACLO +H2O
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NaF and NaCO3 and NaCl
c c c c c

Use test tube reactions which is which - answer-Add name acid, add water, add silver
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nitrate, sodium carbonate will face with acid, sodium chloride gives white precipitate with
c c c c c c c c c c c c c

silver nitrate, sodium fluoride shows no visible change
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Calcium hydroxide and hydrochloric acid, titration, 50 cm³ of 0.02 moles per decimetre
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cubed of hydrochloric acid - answer-Work out loads of acid, measure out 50 cm³ of acid
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using a pipette and at the weight amount of solid in a conical fast, titrate against one
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mole per decimetre cubed of sodium nitrate added from a burette and record the volume
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one and added indicator changes colour, calculate Mr
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Outline how the student could improve this practical procedure to determine the number
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of C=C double bonds in a molecule of the oil so that more consistent results are
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obtained. - answer-Use a larger single volume of oil
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Dissolve this oil in the organic solvent c c c c c c

Transfer to a conical flask and make up to 250 cm3 with more solvent
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Titrate (25 cm3) samples from the flask
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Describe the reagent that you can identify pentanoic acid - answer-Sodium carbonate
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State and explain how CFC 11 is able to contribute to global warming - answer-Infrared,
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has polar bonds
c c c

Explain why polypropylene is unreactive - answer-No polar bonds
c c c c c c c c

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Uploaded on: June 21, 2025
Number of pages: 3
Written in: 2024/2025
Type: Exam (elaborations)
Contains: Questions & answers

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