chapter 8 Chemical reactions

chapter 8 Chemical reactions - C hemical reactions Changes...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Chemical reactions Changes identity Reactants-original Products-resulting Law of conservation of mass Total mass of reactants = total mass of products Chemical equation Represents identities Shows relative amounts of reactants and products Uses symbols and formulas Signs of chemical reactions Heat or light (could also happen in physical) Gas bubbles (gas has been created) Precipitate- forms a solid product Most pure elements are written as an elemental symbol Diatomic molecules - molecules containing only two atoms These elements normally exist this way Br, I, N, Cl, H, O, F, Ar Other exceptions are sulfur: S 8 and phosphorus: P 4 Word equations Uses names instead of formulas Helps to write formula equation Symbols: yields reversible Above equation: or “heat” – heated MnO 2 or Pt – catalyst 25 C - specific temp required ˚ 2 atm – specific P requirement After formula: (s) solid (l) liquid
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
(aq) aqueous - dissolves in water (g) gas Coefficients Whole numbers in front of formula Distributes to number of atoms in formula Specifies relative number of moles and molecules involved in reaction
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 4

chapter 8 Chemical reactions - C hemical reactions Changes...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online