Metals, Non Metals, Acids and Bases
Metals
- Malleable, Ductile & Good conductor of electricity
- High melting & boiling points (Except Na & K)
- Lustrous, Hard (Except Na & K) & Solid at room temp. (Except Hg)
- Forms cations or positive ions for ex. lithium batteries as used in cell phones
Metalloids
- Have some properties of metal & some of non-metals
- For ex. Boron, Silicon, Germanium
Non Metals
- Forms anions except NH3+ & H+
- Iodine is a non-metal but lustrous
- Diamond – Purest form of carbon, hardest natural substance, good conductor of heat
- Graphite – Good conductor of electricity (used in electrodes)
Acids & Indicator Dyes
Acids
Forms H+ ion in presence of water | Reacts with metals to form Hydrogen |
Reacts with bases to form salt & water | Sour taste, Ph < 7 |
Citric Acid – Lemon, Orange | Acetic Acid – Vinegar |
Lactic acid – Sour milk, Curd | Tartaric acid – Tamarind, Raw grapes |
Oxalic acid – Tomatoes | Formic acid – Ant sting, Nettle leaf sting |
Indicators – Dyes which give different colors in acids and bases
Indicator | Color in Acid | Color in Base | Color |
Litmus | Red | Blue | Purple |
Red Cabbage | Red | Green | Red |
Methyl orange | Red | Yellow | Orange |
Turmeric | Yellow | Red | Yellow |
Phenolphthalein | Colorless | Pink | Colorless |
Olfactory Indicators – Based on Smell
- Vanilla – No smell in presence of a base but natural smell in presence of an acid
- Onion – No smell in presence of a base but natural smell in presence of an acid
Type of Reactions
Exothermic Reactions |
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Endothermic Reactions |
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Oxidation Reaction |
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Reduction Reaction |
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Rancity | foul smell on oxidation of food material prepared in oil or ghee, when left in open for a long time |
Matters can neither be created nor destroyed in a chemical reaction i.e. no. of atoms on LHS = no. of atoms on RHS |
Important Acids and Bases
Nitric Acid |
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Gastric Juice |
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Antacids |
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Amphoteric Oxides |
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Aqua Regia |
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K, Na & Li |
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CaCO3 |
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Sodium |
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NH3 + |
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