Mixtures
What is a mixture?
A substance made by mixing one or more substances together.
What is matter?
Anything that has mass and takes up space.
What is a pure substance?
It cannot be separated into any other substance.
Does the composition of a sample change during a physical change?
No, the composition does not change during a physical change.
Define chemical properties.
Properties that are measured or observed when matter undergoes a change and becomes an entirely different type of matter.
What is a homogeneous mixture?
a mixture that is the same throughout
How is matter classified?
Matter is classified based on how it behaves.
Give two examples of a pure substance.
An element and a compound.
What is viscosity?
The physical property of a liquid to resist flowing.
2 main types of chemical properties.
flammability and reactivity
When the parts of a mixture are noticeably different.
3 common states of matter.
solid, liquid, and gas
What is an element?
A substance that is made up of only one kind of atom.
List 5 examples of physical properties.
appearance, odor, conductivity, density, hardness, malleability, viscosity, melting and boiling points
Is a change in size a chemical change?
No, a change in size is considered a physical change.
Trailmix is an example of what?
A heterogeneous mixture.
What is the 4th state of matter?
plasma
Sugar is a substance made of three elements joined in a fixed proportion. So sugar is an example of a mixture or compound?
Sugar is a pure substance and a compound.
Formula for density
What does it mean if a substance has a high reactivity?
It means that it easily combines chemically with other substances.
Can a mixture be both heterogeneous and homogeneous?
No, a mixture can only be classified as one or the other.
Tell when the 4th state of matter can be reached.
If an unknown substance can not be broken down into simpler substances, is it an element or made up of only one kind of element?
both
Does the density of a substance depend on the amount of the substance you have?
No, the density of a substance is constant.
What does it mean if a substance has low reactivity?
It has little tendency to change into other substances.