a) They gain energy and move faster. The intermolecular distance increases.
b) Part XY
c) The energy supplied changes molecules of water from liquid to gaseous state, by breaking the chemical bonds.
johnmulu answered the question on April 6, 2017 at 07:04
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a) Study the properties of substances V2 and V4 in the table below and answer the questions that follows.
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b) Describe how a mixture containing V2 and V4 can be separated.
Date posted: April 6, 2017. Answers (1)
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A piece of chromatography paper was spotted with coloured inks obtained from pens labeled 1 to 6. The diagram below show the spots after the chromatogram was developed.
a) Which two pens contained the same pigment?
b) Which pens contained only one pigment?
c) According to the chromatogram, which pigment are present in the ink of pen number 6?
Date posted: April 5, 2017. Answers (1)
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The set-Up below represents the apparatus that may be used to separate a mixture of two miscible liquids C and D whose boiling points are 80oC and 110oC.
a) Name B
b) What is the purpose of the thermometer?
c) Which liquid was collected in the test tube?
Date posted: April 5, 2017. Answers (1)
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The diagram below shows the relationships between the physical state of matter. Study it and answer the questions that follow.
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b) Name one substance which can undergo the process represented by S and T
c) Explain whether process W is exothermic or endothermic
Date posted: April 5, 2017. Answers (1)
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In an experiment to separate a mixture of two organic liquids, Liquid M (b.p 56oC) and liquid N (b.p.118oC), a student set up the apparatus shown below
a) Identify two mistakes in the set-up.
b) What method would the student use to test the purity of the distillates obtained?
Date posted: April 5, 2017. Answers (1)
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Which curve shows the variation in temperature for pure solid? Explain.
Date posted: April 5, 2017. Answers (1)
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b) What is meant by a radioactive substance
c) State two dangers associated with radioactive substance in the environment(Solved)
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b) What is meant by a radioactive substance
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Date posted: February 22, 2017. Answers (1)
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Date posted: February 22, 2017. Answers (1)
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Date posted: February 22, 2017. Answers (1)
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The half-life of the isotope is 25 days(Solved)
M grammes of a radioactive isotope decayed to 5 grammes in 100 days
The half-life of the isotope is 25 days
a) What is meant by half-life?
b) Calculate the initial mass M of the radioactive isotope.
Date posted: February 22, 2017. Answers (1)
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Determine the empirical formula of the alkanol (C = 12.0: H = 1.0; O = 16.0)(Solved)
An alkanol has the following composition by mass: Hydrogen 13.5%, oxygen 21.6% and carbon 64.9%
Determine the empirical formula of the alkanol (C = 12.0: H = 1.0; O = 16.0)
Date posted: February 22, 2017. Answers (1)
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Date posted: February 22, 2017. Answers (1)
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Date posted: February 22, 2017. Answers (1)
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Date posted: February 22, 2017. Answers (1)
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