Chemistry

• Respiration is an example of exothermic reaction
• Ionic bonding shows exchange of ions between metal and non metal atoms.
• Sodium is stored in Kerosene as it reacts violently with air
• Double Displacement Reaction shows exchange of atoms between compounds.
• Precipitate reaction results in formation of white insoluble precipitate
• Magnesium ribbon is rubbed before burning to get rid of Oxide layer formed
• NaOH + HCL -> NaCl + H2O
• We can test for H2 gas by bringing a candle nearby as H2 gas burns with POP sound
• Alkalis are bases which dissolve completely in water
• Rancidity is the oxidation or going bad of fats and oils
• To prevent rancidity we fill foods with nitrogen or use air tight containers
• A thermite reaction is a highly exothermic reaction
• Antioxidants prevent Rancidity
• Strong Acid + Weak Base -> Acidic salt
• Weak Acid + Strong base -> Basic salt
• Strong Acid + Strong base -> Neutral salt
• Weak Acid + Weak Base -> Neutral salt
• Acid + Base -> Salt + Water - Neutralization reaction
• Neutralization reaction is an example of Exothermic reaction
• Acidic solution turns blue litmus paper to red.
• Basic solution turns red litmus paper to blue
• Common salt (NaCl) is Basic salt
• Potenz scale is also known as pH scale.
• Toothpaste is Basic in nature
• Tooth enamel is made of Calcium Phosphate
• On the pH scale, 0 - 7 is acidic, 7 is neutral and 7 - 14 is Basic
• Decrease in pH is Increase in H+ ion and decrease in OH- ion
• Increase in pH is increase in OH- ion and decrease in H+ ion
• Ionic bonding is the exchange of ions between metal and non-metal
• Covalent bonding is the sharing of electrons between atoms.
• Bleaching powder - CaOCl2

  Baking soda - NaHCO3

  Washing soda - Na2CO3
• Cation - Positive ion

  Anion - Negative ion

  Cathode - Negative, attracts positive shit

  Anode - Positive, attracts negative shit
• The electrode at which oxidation occurs is called Anode
• The electrode at which reduction occurs is called Cathode
• Acid are sour in taste
• Base is bitter in taste