Has a chemical reaction occurred? How do you know?

Heterogeneous or Homogenous

Writing chemical equations… label products and reactants

Sodium hydroxide plus magnesium chloride produces sodium chloride and magnesium hydroxide

Water decomposes to form hydrogen gas and oxygen gas

Methane (CH4) and oxygen gas produce water and carbon dioxide

Chemical v. physical properties

States of Matter

Definite volume definite shape

Indefinite shape definite volume

Indefinite shape Indefinite volume

Phase changes

Solid to liquid

Liquid to a gas

Gas to liquid

Gas to solid

Liquid to a solid

Solid to a gas

Balance the following equations

NaH2PO4 -> NaPO3 + H2O

SO3 + H2O -> H2SO4

BeF2 + Mg -> MgF2 + Be

Conjugate Acid and Conjugate Base

HClO4(aq) + H2O(l) ⇄ H3O+(aq) + ClO4–(aq)

NH3(g) + H2O(l) ⇄ NH4+(aq) + OH–(aq)

HNO2(aq) + HS–(aq) ⇄ NO2–(aq) + H2S(aq

What affects a reaction rate?