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t1 common assesment cards
Element: .
A pure substance that is only made of one atom and cannot be broken down into other substance.
Compound
A combination of two or more substances that can be broken down into elements
Heterogenous Mixture:
A mixture of two or more substances that is not uniform throughout.
Homogenous Mixture:
A mixture of two or more substances that is uniform throughout the mixture.
Gas:
A substance that can move freely throughout its container. It has no volume or shape.
Liquid:
A substance that has volume, but no definite shape.
Solid:
a substance that has both shape and volume.
Physical Change:
A change that affects the state of matter of a substance, but not the composition. (i.e ice to water)
Chemical Change:
A change that affects the chemical composition of a substance.
What are the signs of a chemical reaction?
Changes in color, a release of gas, a release in energy or light, solids forming, and odor are some of the signs.
What does a graduated cylinder measure?
It measures volume.
What does a scale measure?
It measures weight
What is the formula for density?
d=m/v
Atomic Number
The amount of protons in an atom.
Mass Number
The total number of protons and neutrons in an atom's nucleus.
Isotope
Atoms of the same element with different numbers of neutrons, resulting in different mass numbers.
ion
An atom that has gained or lost electrons.
Note 
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