Point to Remember in Chemistry
WEeb.in Team Science Total Views: 521 Posted: Feb 7, 2020 Updated: Oct 1, 2026
Point to Remember in Chemistry
| Element that is common to all acids | Hydrogen |
| Most Abundant element in the earth’s crust | Aluminum |
| First scientist to use symbols for elements in a very specific sense | John Dalton |
| Oxides of metals which show characteristics of both acidic and basic nature | Aluminum Oxide and Zinc Oxide – known as atmospheric oxides |
| Metals kept in kerosene to avoid combustion in open air due to their high reactivity | Potassium and Sodium |
| The relation of two or more compound that are composed of the same kind and number of atoms but differ from each other in structural arrangement | Isomers – Phenomenon is called Isomerism |
| The temperature at which a given mass of gas does not occupy any volume or does not exert pressure | Absolute Zero temperature |
| Celsius Scale
Kelvin Scale Fahrenheit Scale |
Three scales to measure Temparature |
| Diamond
Graphite Amorphous |
Three states of Carbon |
| Substance that can exist in all the three states of matter – Solids, Liquids and Gases | Water |
| Acid that decomposes at ordinary room temperature | Nitric Acid |
| Strongest Oxidizing Agent | Fluorine |
| Strongest Reducing Agent | Lithium |
| Element found in maximum percentage in Human Body | Oxygen |
| The purest form of coal | Anthracite |
| Main element used in the conversion of Solar Energy | Silicon |
| PH values of important compounds:
Hydrochloric Acid Vinegar Tomatoes Milk Pure Water Human Blood Milk of Magnesia Sodium Hydroxide |
0 2.2 4.5 6.6 7.0 7.4 10.5 14 |
| Element which has highest Melting Point | Tungsten |
| Element which has highest electron affinity | Chlorine |
| Element with highest Boiling Point | Tungsten |
| Element with lowest Boiling Point | Helium |
| Element which has the highest Density | Osmium |
| Element with the lowest Boiling Point | Helium |
| Element with the lowest Density | Hydrogen |
| Most commonly used chemical in photography | Silver Bromide |
| Most commonly used chemical for artificial rain or cloud seeding | Silver Iodide |
| Most common chemical used in toothpaste | Fluoride |
| Most common chemical used Voting Ink | Silver Nitrate |
| Chemical commonly used in Artificial ripening of Fruits | Calcium Carbide |
| Commonly used chemical used in Airbag | Sodium Azide |
| Commonly used chemical in Blood Bank | CPD : Citrate-Phosphate- Dextrose |
| Commonly used Chemical in Mouth Wash | Hydrogen peroxide |
| Most commonly used semiconductors | Germanium and Silicon |
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