highschool/Grade 10/Science/SNC2DZ/Unit 1: Chemistry Part 2.md

Chemistry

Acids

Naming Binary Acids

• \(`HCL_{(g)} \rightarrow`\) hydrogen chloride
• \(`HCL_{(aq)} \rightarrow`\) hydrofluoric acid
• Need to put the hydro prefix as it tells us its disolved in water and is an acid

Oxyacids

Naming Oxyacids

• ite ions make ous acides (suffix). \(`HCLO_2 = `\) Chlorous acid
• ate ions make ic acides (suffix). \(`HCLO_3 = `\) Chloric acid
• Prefixes stay the same

Chemical Change

• Similar to chemical reaction

Evidence of chemical change: (observations that tell us its happening)

1. A new gas is formed (new odour, formation of bubbles)
2. A large change in energy (eg. Light, heat, sound, electricity)
3. A new colour is formed
4. A new solid is formed

Representing chemical reactions

• A Chemical equation!
  • Used to model what is happening during a chemical reaction.
  • We use an arrow instead of an equal sign to show beomces, reacts to form, produces
  • On the left side, we always have the REACTANTS, (INPUT), these get used up in the chemical reaction
    • There can be plus signs to show multiple reactants. (Recipes, we are adding them together)
  • On the right side, we have the **PRODUCTS** (OUTPUT).
    • Newly produced/made from reactants
      
    • Plus signs show multple products, more like an AND more than anything else
• In a chemical reaction, reactant, molecules/atoms/formula units/ions reaarange to produce products moleccules/atoms/ions/formula units
• eg. Wax \(`+`\) oxygen gase \(`\rightarrow`\) Soot \(`+`\) Water \(`+`\) Carbon dioxide.
• A word equation
• \(`\triangle`\) Greek letter to represent heat.
• \(`C_{25}H_{52(g)} + O_{2(g)} \rightarrow^\triangle C_{(g)} + H_2O_{(g)} + CO_{2(g)}`\)