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Dalton's Atomic Theory
- 1. Atoms are the building block of all matter.
- 2. Elements are things made from only one type of atom. Different matter cam ne realized from same atoms by different interactions of atoms.
- 3. Compounds are matter that combines atoms in specific ratios
- 4. Chemical reactions are a change in association in atoms that make up matter.
A change that doesn't result in new material or changes in chemical makeup. Example: if something is brittle.. it breaks... this is a physical change
The study of properties and tranformation of matter.
- Change that alters chemical makeup. Will generate new material
- Example: Metal that has rusted, wood that's been burned
- A tiny invisible building block of all matter. All known atoms are represented in the periodic table.
- Atoms cannot be created or distroyed They can be moved around and have associations changed
Matter made from one type of atom. Different matter can be realized from same atoms by different interaction of atom. Example: Carbon can be in graphite and in diamonds.
Small group of connected atoms acting as one unit.
- Matter that combindes atoms in specific ratios.
- 2 or more elements combined together.
Change in association in atoms that make up matter
How should you talk about atoms?
- Number of atoms: in moles 6.022 x 10^23
- Weight: in atomic mass unit (amu)
- Size: Angstrom (symbols is A with small circle above it.) 1 angstrom is .0000000001 meters
A word used to represent a very large number.
3 states of Matter
- Solid (Most elements, does not flow, not compressable has definite shape.)
- Liquid(Cannot change volume, flows
- Gas (indefinite shape, can be compressed)
Physical Properties of Elements
- Solid metals are shiny, ductile(can be made into wires) malleable and are conducters of heat and electricity
- Solid Nonmetals are Dull, non ductile, brittle, insulators (non conductors)
Group on the far right of the periodic table. Most do not mix with any other gases.
Found in the middle of the periodic table in groups 3-12. Commonly found as oxygen or sulfur ores.
1st group on periodic table. More reactive to water than Alkaline earth metals. Never found in nature in their pure state.
Alkaline Earth Metals
2nd group on the periodic table, less reactive to water but still not found in pure form naturally.
group 7A, the second to last on the periodic table, found in nature in combination with other elements, they mix with salt
The same throughout Example: Saline solution
- Not the same throughout.
- Example: Wood, bird