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The following are signs that a chemical change is happening:
CHANGE IN COLOUR: when leaves change colour in autumn, they are going through a chemical change
CHANGE IN ODOUR: you can tell that an egg is rotten because of the awful odour. A rotting egg is going through a chemical change
A PRECIPITATE FORMS: a precipitate is a solid that forms when certain liquids are mixed together. If you see a precipitate form, you know that a chemical change has occurred.
A GAS IS PRODUCED: when you mix certain substances together, the mixture will begin to bubble. The bubbles are made of a gas that is produced through a chemical change.
is anything that takes up space and has mass
is the amount of space that matter takes up
is the amount of matter in an object - matter is made up of tiny particles and since every object is made of particles, every object has mass
which one has a larger volume?
which one has more mass?
is different forms that matter can take on
Changes in states of matter are always physical changes because they can be reversed.
For example, you can melt an ice cube (a solid), then freeze the water (a liquid) to turn it back into ice.
Another example is cutting an apple into two pieces because you could put the two pieces back together.
are reversible
In a chemical change, a new substance—or more than one new substance—is formed.
For example, if you burn a piece of wood, two new substances are formed: smoke and ash. The smoke and ash cannot be turned back into wood.
are non-reversible
Another example is cooking an egg. You cannot change the egg back into the original raw egg.
absorption of heat
release of heat
Is this an absorption or release of heat?
absorption of heat
release of heat
soluble
not
soluble
The phase can change depending on pressure and temperature conditions.
honey has a higher viscosity because it resists flowing more than milk does
Freezing Point: the point at which a liquid turns into a solid (ex water in an ice cube tray will turn into ice cubes after the temperature is 0 degrees or lower)
Solubility - how easily a substance dissolves in a liquid
Viscosity - how easily a substance flows
Transparency - how well light passes through a substance
Hardness - how easily an object changes shape
Melting Point: the point at which a solid turns into a liquid (ex melting plastic to be recycled)
if the substance is clear (you can see objects through it) then it is transparent
if light passes through the substance but you cannot see objects through it, it is translucent
if no light passes through the substance it is opaque
a hard object like a rock does not change shape easily
a soft object like a pillow will change shape easily