WEEK4 - Topic 6

Video 1: An Introduction to Chemical Equations

Law of conservation of Mass

: the total mass of substances in a chemical reaction must remain constant

Video 2: Balancing Chemical Equations

Start with the most complex compound

Balance polyatomic ions as one unit

Leave atoms that appear more than once on one or both sides of the equation to the end

 

Video 3: Types of Chemical Reactions

< Types of reaction >

1. combination

2.decomposition

3.single displacement

4.double displacement

5.oxidation-reduction

Video 4: Aqueous Solutions and Solubility

-Solute / Solvent / Solution

-Such seperation is called 'dissociation'

-Water molecules solvate the sodium cations and chloride anions

-'General guidelines for the solubility of common ionic compounds rule'

*ionic compounds are often called salts

Video 5: Writing Equations for Precipitation Reactions

*precipitation 침전

Precipitation reactions are double displacement reactions in which an insoluble product is formed

 

Because both substances are compounds-> double displacement

Because both substances are ionic compounds -> precipition reaction