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22 Cards in this Set

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Chemistry

The study of the properties of matter and how matter changes

Substance

Single kind of matter that is pure and has a specific set of properties

Every form of matter has two kinds of properties. What are they?

Physical properties and chemical properties

What are examples of pure substances

Table salt, table sugar, and baking soda

Things that are not pure substances

Flour, baking powder, milk, eggs, and fruit

Physical property

A characteristic of a pure substance that can be observed without changing it into another substance.

Chemical property

A characteristic of a pure substance that describes its ability to change into different substances.

What are some examples of physical properties?

1. Icicles of solid water will change to liquid. 2. Metal becomes a shiny, flexible toy when shaped into a flat wire and coiled


3. Bumpy texture, bright colors are physical properties of a chameleon.

What are some examples of chemical properties?

1. Gases produced during baking create spaces in freshly made bread.


2. Wood fuels a fire, producing heat, gases & ash.


3. Iron can form rust

Elements Are…….

the simplest substances

Atom

The basic particle from which all elements are made.

Water Molecule

has two hydrogen atoms and 1 oxygen atom

Oxygen Molecule

has two oxygen atoms

Carbon dioxide molecule

One carbon atom and two oxygen atoms

Compound

a pure substance made of two or more elements chemically combined in a set ratio

Chemical formula

shows the elements in the compound and the ratio of atoms

Formula for carbon dioxide

CO2

Mixture

Made of two or more substances

Heterogeneous Mixture

A mixture that you can see the different parts

Example of a heterogeneous mixture

Moist soil, a salad

Homogeneous Mixture

A mixture in which the substances are so evenly mixed that you can't see different parts.

Example of a homogeneous mixture

sugar dissolved in water