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2.1 Describing Matter
Transcript of 2.1 Describing Matter
matter - anything that has mass and takes up space
substance - a single kind of matter that is pure, meaning is always has a specific make up and a specific set of properties
Pure substances -
Not pure substances-
All forms of matter have two kinds of properties:
physical properties - a characteristic of a pure substance that can be observed without changing it into another substance
chemical properties - a characteristic of a pure substance that describes its ability to change into a new substance
Element - a pure substance that cannot be broken down into any other substances by chemical or physical means
Atom - the basic particle from which all elements are made.
chemical bond - the bond that is formed when atoms combine
molecule - groups of two or more atoms held together by chemical bonds
compound - a pure substance made of two or more elements chemically combined. (compounds will have properties that differ from the uncombined elements that they are made of)
Hydrogen and Oxygen are both gasses at room temp but they combine to make water which is liquid at room temp.
mixture - two or more substances (elements, compounds, or both). They are together in the same place but not chemically combined.
The substances in a mixture keep their individual properties and are not combined in a set ratio.
Examples of mixture:
1. cereal in milk
2. sand in water
3. worms in soil
4. oil and water
Two Types of Mixtures
heterogeneous mixture - you can see the different parts
homogeneous mixture - so evenly mixed that you can't see the different parts.
What are some possible ways to separate mixtures?
Watch the following video and write down as many examples of each type of property as you can:
1. Look around your house and find 3 examples of heterogenous mixtures and 3 examples of homogenous mixtures.
2. Propose a method of separating each of the mixtures.
physical and chemical properties
What do you already know?
Try to define the following words as accurately as possible:
If you had an extremely powerful microscope and looked at the chemical make up of an object, what would you see?