Mixtures and Solutions
This can be easily separated and consists of 2 or more different objects
HINT: Temperature affects all of these!
Dissolving, Melting, Evaporation, Condensation, and Freezing
What is the main difference between physical and chemical changes?
What CAN you do with physical changes that you CANNOT do with chemical changes?
Chemical changes are NOT REVERSIBLE!
This form of separation is based on object's ability to float.
This is a solid dispersing evenly into a liquid. This cannot be separated easily.
What do you call the physical change where a solid evenly disperses in a liquid?
Dissolving
Does heat speed up or slow down chemical changes?
Ex. This about cooking .... if it is at a higher temperature, does food cook faster? Is cooking a chemical change...?
Heat speeds up chemical changes
This form of separation is done with a filter
Filtration
This process allows the solid to disperse evenly throughout the liquid
Dissolving
A piece of cheese is put into a pan on the stove. As the temperature increase, the cheese slowly starts to spread across the bottom of the pan, changing from a solid to a liquid. What physical change is happening?
Melting
Water is spilt onto the hot stove and quickly disappears into the air as steam. Is this a chemical change?
No. This is a physical change!
This form of separation is done with either your hands or a tool. Simple form of separation. An example of this is when you clean or organize your room.
Sorting
Do the materials in a mixture keep their original properties?
Ex. If legos and marbles are mixed together in a bin, do each of those materials keep their original properties?
Yes they do.
What is the physical changes that is caused by an increase in temperature that causes a liquid to turn into a gas?
Evaporation
A chemical changes results in a _________ substance. This substance has different products from what there was originally.
New
Separating particles by their different sizes is known as what?
Sieving or sifting
What are the three things that can speed up the dissolving process?
Stirring, breaking the solid into smaller particles, and heat
What physical state change usually results in dew or fog and happens due to a decrease in temperature?
Condensation
What is an indicator of chemical change?
Color change, light, heat, creation of something new
This form of separation is when particles have the tendency to settle at the bottom of a liquid.
Sedimentation