What is matter Select a lesson
 

Physical and chemical changeDefine matterWhat are solidsWhat are liquidsWhat is a gaschange of state in matterThe bahaviour of matterPhysical change in matterChemical change in matter.html


RECOMMENDED LESSONS:
What is electricity
Simple machines for 4th grade
Genetic engineering
What is a force
Wins Forces Energy Genetics reproduction Ecosystems
Photosynthesis in green plants
Seperation of mixtures

What is genetics
How do winds form
EnergyThe hydrolic cyclehow are soils formed

What is a chemical change



What are solids?


Solids are simply hard substances, and they are hard because of how their molecules are packed together. Examples include rock, chalk, sugar, a piece of wood, plastic, steel or nail. They are all solids at room temperature. They can come in all sizes, shapes and forms.

Think of ice cubes as an example. They are solids when frozen. They change into liquid at room temperature.
What about ashes? Is that solid too? Yes, ashes are tiny solid particles that fall off when something burns— like wood ash in the fireplace.

In the diagram below, see how similar the arrangement of molecules are in the piece of rock and wood ash.
Molecules in a solid


Characteristic of particles (molecules) in a solid.

characteristics of solidsThe particles are close together (that’s why they cannot be squashed or compressed.
characteristics of solidsThe particles cannot move freely from place to place (this is why they have a fixed shape).
characteristics of solidsThe particles are arranged in a regular, distinct pattern.
characteristics of solidsThe particles are held together by strong forces called bonds (This is why solids do not flow like water. Their particles are only able to vibrate in their position and cannot move from place to place.)
characteristics of solidsThe particles can vibrate in a fixed position

Different solids behave slightly differently because they have different properties such as ‘STRENGTH’. This makes solids useful for different things. Look at a pencil eraser—it is solid, but can slightly change shape because the strength of its bonds is slightly weaker that that in a piece of diamond.

Previous pageGo to next page

What is condensationevaporation


...


SEE OTHER REVISION LESSONS AVAILABLE ON ESCHOOLTODAY
PHOTOSYNTHESIS | FORCES | GENETICS | KINDS OF ENERGY

WATER POLLUTION | AIR POLLUTION | LAND POLLUTION | ECOSYSTEMS | WINDS | ELEMENTS MIXTURES COMPOUNDS
DROUGHTS | TORNADOES | EARTHQUAKES & TSUNAMIS | FLOODS | WILDFIRES | HURRICANES | VOLCANOES | THE WATER CYCLE

Copyright © 2008-2016 eSchooltoday in association with BusinessGhana.com.
All Rights Reserved.