# 3.2 To discover the properties of materials

 Page 1 / 3

## Memorandum

Assignment 6:

1. What is the colour of the crystal?

• Purple

2. What happens to the coloured water around the crystal when the heating begins?

• When the water is heated it rises.

3. What happens to the coloured water near the surface of the water?

• The coloured water near the surface begins to move in a circle in the Pyrex dish. It sinks in the part that is not being warmed by the burner..

Assignment 7:

• (Groupwork)
• When a see breeze is caused by convection, your group should be able to work out how a land breeze occurs. Make sketches and write your explanation here.

How does a land breeze occur?

During the night the land cools more quickly than the sea. The sea stays warm longer than the land. The warm air above the sea rises. Cooler air from the land blows towards the sea

Assignment 8:

1. What happens when you place the pane of glass in front of the heater?

• Immediately you feel less heat.
• (The heater / source of heat is not warm enough. Glass obstructs radiated heat from the heater, just like wood or cardboard)

Assignment 9:

1. Does your hand immediately feel the heat?

• Yes

2. How does the heat reach your hand?

3. Does the glass of the bulb prevent radiance?

• No, because the radiation from a very warm (white hot) object can penetrate glass.
• Explanation: Water conducts electricity and if you touch an electrical appliance while you are standing on the ground the current flows through your body to the ground. This can cause a fatal shock.

## Activity: to discover the properties of materials [lo 1.2, lo 2.1, lo 2.3]

4. MATERIALS CAN TRANSFER HEAT

If you hold a teaspoon in boiling water it feels warm when you touch it. Heat has thus been transferred from the water to the teaspoon. (This transfer of heat will not happen if both substances are the same temperature.)

Transfer of heat takes place in three ways: Conduction, convection and radiation.

4.1 Conduction:

This is the transfer of heat from one part of a substance to another, while each part remains in its place.

• Conduction takes place in solids.
• Most metals are good conductors of heat.
• Non-metals such as glass, wood, rubber, paper, plastic and asbestos are poor conductors of heat.
• Solids do not all conduct heat equally well.

Interesting uses of poor conductors:

• Handles of pans, irons, etc. are made of wood or plastic or other poor conductors. This keeps ones hand from getting burnt.
• Clothes (wool, cotton), the furs of animals, feathers, are all poor conductors of heat.
• A glass table top and table mats of wood, cork, cotton or plastic protect shiny wooden table tops from being marked by warm pots.
• Cold meat and cold drink can be kept cold on a long journey by wrapping them in newspaper or a woollen blanket. Paper and wool are poor conductors.
• Ice can be kept for a long time in sawdust or wrapped in a towel.
• Houses with thatched roofs are warm on cold days and cool on hot days.
• House with flat roofs are insulated with a layer of glass fibre above the ceiling.
• Eskimos build houses of snow to protect themselves from the cold.

how can chip be made from sand
are nano particles real
yeah
Joseph
Hello, if I study Physics teacher in bachelor, can I study Nanotechnology in master?
no can't
Lohitha
where we get a research paper on Nano chemistry....?
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
what are the products of Nano chemistry?
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
revolt
da
Application of nanotechnology in medicine
has a lot of application modern world
Kamaluddeen
yes
narayan
what is variations in raman spectra for nanomaterials
ya I also want to know the raman spectra
Bhagvanji
I only see partial conversation and what's the question here!
what about nanotechnology for water purification
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Got questions? Join the online conversation and get instant answers!