Chapter 1

Property : a characteriste that belongs to a person or thing

Matter: anything that has moss et takes up space

Chemesty: the study of matter and how it changes.

Substance! a single kind Of matter that is pure.

Physical property: a characteristic of a substance that can be observed without changing it into another substance.

Chemical property: as characteristic of a stillstance that describes its ability to change into anther substance.

Element: a substance that eannot be broken dewn into amy other Substance.

-all matter is made of atoms

Atom: the basic particle from which all elements are made

Chemical bond: atoms combine with other atoms

Molecule : a group of 2 or more atoms held together by chemical bond

Compound: a substance made of 2 or more elements that are chemicaily combined in a set ratio.

- they are represented by a chemical formula

When elements combine, the copound that forms nas different properties than the original elements.

-Elements and compounds are substances

Mixtures: made est of 2 or more substances that are all together in the same place but the atoms are not chemically bonded.

- each substance Keeps its own properties

Types of mixtures:

Heterogeneous: you can usually see the eifferent parts and can be easily separated.

Homogeneus: The substances are evenly mixed, you can I see the different parts and it's difficult to separate.

HOW to separate a mixture: distilation, filtration,evaporation,magentic atraction.

Physical change: alters the form of appearance of matter but does not turn any substance into a different one.

Chemical chanange: produces ones, or more new substances and have different properties.

Law kf conservation of Mass: Matter can not be created or destroyed in a chemial or physical change, it can only be changed.

Energy; the ability to do work or make a change

Endothermic change:energyis absorbed

Exothermic change: energy is redlesed