Science
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Chemical change
A new substance is created. (e.g. Burning something.)
Physical change
No new substance is created (e.g. Glass breaking)
The 7 indicates of a chemical change
• A precipitate • An odour • Bubbles appear • A change in temp • Light is emmited or a flame is produced • Change in colour • A substance disappears
Molecule
2 or more non-metal atoms chemically combined. It can be an element or a compound.
Law of conservation of mass
Matter can’t be created, nor destroyed, it only changes from one form to another.
Element
A pure substance that can’t be broken down further.
1
Nothin’
2
Di
3
Tri
4
Tetra
5
Penta
6
Hexa
7
Hepta
8
Octa
9
Nona
Deca
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Definition of an atom
The smallest particle of a chemical element that can exist.
Definition of Compound
A pure chemical substance made of two or more different elements chemically bonded together in a fixed ratio.