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Why are elements and compounds classified as pure substances?
Every samples of a given substance has the same properties because the substance has a fixed, uniform composition.
An element has a fixed composition because it contains only one type of atom.
A compound always contains two or more elements in a fixed proportion.
How do mixtures differ from pure substances?
The properties of a mixture can vary because the composition of the mixture is not fixed.
What is the main difference among solutions, suspensions, and colloids?
the size of its largest particles
What is the difference between chemical changes and physical changes?
when a matter undergoes a chemical change, the composition of the matter changes. When matter undergoes a physical change, the same composition of the matter stays the same.
a substance that is made from 2 or more simpler substances and can be broken down into simpler substances.
the substances are evenly distributed that it is difficult to distinguish one substance in the mixture from another. the mixture apears to only contain one substance.
solutions (signs of one)
they do not separate into layers.
none of the substances are trapped in a filter.
light passes through them without scattering.
a heterogenous mixture that separates into layers over time. you can filter out a suspension to separate it.
do not separate into layers and you cannot filter them, but light will be scattered through a colloid.
physical property (list 7)
physical properties are used to.....
identify a material, choose a material for a purpose, or to separate substances in a mixture.
properties to identify materials help us.....
decide what properties to test, do tests, and compare results.
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