THIRD PERIOD

Third PERIOD

·      CHANGES IN MATERIALS: reversible and irreversible changes, changes by heating and cooling ( melting, freezing) and Dissolving.

·      Light and dark

·      Electricity   

Changes in Materials

CHANGING MATERIALS 

materials  can be changed by heating or cooling
Heating or cooling can cause materials to change state. Water is a great example to use in all three states with evaporation, condensation, melting and freezing.

What does it mean when materials change state?

Materials can be changed from one of the three states to another by certain processes, usually heating or cooling. An example would be liquid water which can be changed into steam by heating or cooled to form solid ice.

watch the video

• If water is cooled enough, it can change to ice.

look at the video about water freezing https://players.brightcove.net/2698740430001/default_default/index.html?videoId=6017863651001



 • If ice is warmed enough, it can change to liquid water.
look at the video about ice melting
https://players.brightcove.net/2698740430001/default_default/index.html?videoId=6017800192001

 Water can be cooled to make ice and then the ice can be warmed to make liquid water again.
Cooling and heating water in this way can make the changes go back and forth

• Heating a substance makes the molecules move faster. • 

Cooling a substance makes the molecules move slower.

MATTER CHANGES WHEN IS HEATED OR COOLED

FROM SOLIDS TO LIQUIDS

MELTING

molecules gain energy and start moving faster, sliding over each other.

FROM LIQUIDS TO GAS

EVAPORATION

molecules gain energy and start moving faster, molecules spread through out the space.

FROM GAS TO LIQUID 

CONDENSATION

Molecules lose energy, packed close together sliding over each other.

FROM LIQUID TO GAS

FREEZING 

Molecules lose energy, packed very close to each other not moving around but vibrating.

melting

evaporation

freezing 

materials can  be changed by force

1. squash

2.  stretch 

3. bend 

4.twist

MATERIALS CAN CHANGE WITH WATER

DISSOLVE OR NOT DISSOLVE

STUDY GUIDE

STUDY GUIDE 

https://drive.google.com/file/d/1iGzGTjVVT2iSy0UOOzo3KnFlaZ7Yn0N7/view?usp=sharing

USE  YOUR NOTEBOOK 

BIOLOGY : WEATHER AND SEASONS 
TEXTBOOK AND WORKBOOK 



USE YOUR NOTEBOOK
CHEMISTRY:
MATERIALS ALL AROUND US - MAN-MADE AND NATURAL MAN-MADE
ROCKS AND THEIR USES
 MATTER 

MATTER

Matter

Matter is all around you. Your bed, your dog,

even the air you breathe, are all made of matter. 

Matter is anything that takes up space, including 

gases and liquids.

 Matter takes on different forms, known as the

 states of matter.

 You probably already know about solids, gases 

and liquids, right?

matter is made of molecules and molecules are made of one or more atoms .... when atoms put together formed MOLECULES...

MOLECULES TOGETHER FORM MATTER.

STATES OF MATTER 

SOLIDS

liquids

Gases

MOLECULES 

IN EACH STATE

MATTER CAN CHANGE

CHANGES IN STATES OF MATTER 

MATTER CHANGE WHEN IS HEATED OR COOLED

FROM SOLIDS TO LIQUIDS

MELTING

molecules gain energy and start moving faster, sliding over each other.

FROM LIQUIDS TO GAS

EVAPORATION

molecules gain energy and start moving faster, molecules spread through out the space.

FROM GAS TO LIQUID 

CONDENSATION

Molecules lose energy, packed close together sliding over each other.

FROM LIQUID TO GAS

FREEZING 

Molecules lose energy, packed very close to each other not moving around but vibrating.

melting

evaporation

freezing 

Weather and us

types of weather 

clothes to wear

activities to do

collect data about weather 

air temperature- thermometer

rainfall- rain gauge

wind 

wind speed

wind direction

activities-practice

seasons 

In many parts of the world, the year is made up of four different seasons. These seasons are spring, summer, autumn/fall, winter.

games online

http://www.sheppardsoftware.com/scienceforkids/seasons/seasons.htm