Chem H Chpt 8

What are the 7 diatomics?

Br, I, N, Cl, H, O, F

What is a diatomic?

Unstable elements alone. When written they need to be doubled. H₂

Chemical Reaction

A process where one or more substances turn into a new substance

Chemical equation

A chemical reaction expressed as a sentence

Formula equation

an unbalanced, simplified chemical equation (no coefficients used)

(g)

gas

(s)

solid or precipitate

(l)

liquid

(aq)

aqueous solution (dissolved in water)

⇌

reverse reaction

Arrow with triangle on top sign

When heated

→

yeilds

A+B → AB

Synthesis reaction

A+BX → AX+B or Y+BX → BY+X

Single displacement

AX+BY → AY+BX

Double displacement

AB → A+B

Decomposition reaction

C_xH_y+O₂ → CO₂+H₂O

Combustion reaction

reduced

when an element uses an electron

oxidized

when an element gains an electron