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1-The small molecular building units are called Monomers

2- Bases are chemical compounds that taste bitter, turn litmus blue and feel slippery

3-Liquified Petroleum Gas is a mixture of hydrocarbons containing three or four carbon atoms, such as propane, butane and pentane.

4-The substance, which produce heat and light on combustion are called fuels.

5- Catalyst is a material that is added to a reaction mixture to accelerate the process but is itself not consumed.

6-An Atom is the smallest unit of an element.

7-Everything in the universe is made of a combination of a few basic substances called elements.

8- Acids are chemical compounds that taste sour, turn litmus red, and often react with some metals to produce hydrogen gas.

9-Lavoisier , a French Chemist is regarded as the Father of Modern Chemistry.

10-The Boiling Point of water is 373 K.

11-Boiling Point is a temperature at which the vapour pressure of the liquid is equal to atmospheric pressure.

12-The Fundamental Particles of an Atom are Electron, Neutron, and Proton.

13-Atoms of the Elements having same atomic number but different mass number is called as Isotopes.

14-Acetic Acid is present in Vinegar

15-Atom of Hydrogen is the smallest and lightest

16-Hydrogen (H) is the first element of the periodic table (upper left corner). It only has one electron and one proton.

17- Atomic Mass Unit, “amu” is the abbreviation for the units used to measure the masses of elements.carbon (C) has a value of 12.011 amu

18-Diamond is the only pure substance that could form crystals

19-The average adult human body contains about 250 grams of salt, which is just over half a pound. If you don’t have enough salt, your body suffers an electrolyte imbalance called hyponatremia.

20-The symbol Sb stands for stibnum or stibnite. What is the modern name of this element
Ans-Stibnum is the old name for antimony.

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