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Natural sciences

Form, reaction and alteration of materials

Educator section


1. In which glass is the sugar dissolved quickest?

  • In the glass with warm water.

2. Explain why this happens.

  • The solubility of a substance is affected by the temperature.

Assignment 13:

  • (Groupwork)
  1. How many teaspoons of sugar could you dissolve into the glass of water?
  • The amount depends on the individual experiment.
  • Discus in your group what you could do to dissolve more sugar into the water.
  • The water (solution) can be heated.
  • The sugar crystals (dissolved substance) and be made finer.

Assignment 14:

Observation: The water has evaporated and small crystals have been formed: copper sulphate crystals. Under the microscope the crystals appear as small blocks or cubes.

Conclusion: When a solution is left to stand the opposite of dissolving occurs. The dissolved substance crystallises into a solid in the form of crystals.

Assignment 15:

  1. Is the amount and type of solvent the same in all three cases?
  • Yes
  • Which substance was dissolved the least after the first teaspoon?
  • Corn meal
  • Is corn meal insoluble?
  • Yes

4. Which substance dissolved best?

  • Salt

Conclusion: Not all substances are equally soluble.

Assignment 16:

  1. What do you see?
  • Oil does not dissolve. You continue to see drops of oil on the water

2. Where is the oil?

  • While you are stirring it seems that the oil is mixed with the water, but the moment that you stop stirring the oil floats to the surface of the water.

3. Can oil dissolve in water?

  • No

4. What is the reason for the answer above?

  • Particles of oil are strongly attracted to each other. Water particles cannot move in between the oil particles, so oil is not soluble in water.

Assignment 17:

1. What happens?

  • The naphthalene flakes do not dissolve in water but do dissolve in mentholated spirits.

2. Can you explain why this happens?

  • Naphthalene flakes are not soluble in water.

3. Complete.

  • Naphthalene is easily dissolved in mentholated spirits but is not soluble in water

Leaner section


Activity: to determine the factors that affect the solubility of materials [lo 1.1, lo 1.2, lo 1.3]

The solubility of a material is determined by:

  • temperature;
  • type of material; and
  • type of solvent.


To determine how temperature affects solubility.

Requirements: Sugar

A glass of cold water

A glass of warm water

A teaspoon

  • Put one teaspoonful of sugar into the glass of cold water and another into the glass of warm water.
  • Do not stir the water.
  • Observe what happens.

What do you observe?

1. In which glass is the sugar dissolved the quickest?


2. Explain why this happens.



Sugar is SOLUBLE in water.

The sugar is the DISSOLVED substance.

The water is the SOLVENT.

The sugar water is the SOLUTION.

HEAT increases the process of solution.

  • A saturated solution:

Water can only take a certain amount of a dissolved substance like sugar. When the water can not take more of the substance, we say that it is a saturated solution.

Questions & Answers

what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
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Source:  OpenStax, Natural sciences grade 6. OpenStax CNX. Sep 16, 2009 Download for free at http://cnx.org/content/col11079/1.1
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