Page 2 - index
P. 2
Å’ Fill about one third of the dry test tube with
sugar crystals.
Procedure  Fix this test tube in a test tube holder or 1. What name will you give
Chemical clamp of iron stand. to the black residue left
Equation
Observations Ž Heat the test tube gently with a Bunsen at the end of the
Result burner. experiment?
 A blue flame is used for heating because it 2. What is caramel and
where is it used?
is hotter and cleaner.
 Bring dry cobalt chloride paper near the
mouth of the test tube and observe the
change in its colour.
C H O12 22 11(s) Heat 12 C(s) + 11 H2O(g)
Sugar Water vapours
Experiments Observations
Take common sugar in a test tube
and heat it gently.
Heat the above test tube strongly.
Take cobalt chloride paper near the
mouth of the above test tube.
__________________________________________________________________
Post Lab. 1. Take a few crystals of glucose in a test tube. First heat gently and then
Activities strongly. Record your observations in the table below:
Experiment Before heating After gentle heating After strong heating
Physical state of
glucose (colour)
37
