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answer no 1:- Sound is defined as vibrations that travel through the air or another medium as an audible mechanical wave. It is produced from a vibrating body. The vibrating body causes the medium (water, air, etc.) around it to vibrate thus producing sound.
answer no 2:- Momentum is the quantity of motion of a moving body, measured as a product of its mass and velocity. it formula = mass × velocity. so it's SI unit is = kg×m/s=kgm/s.
answer no 3:- The chemical element of an atom is determined by the number of protons, or the atomic number, Z, of the nucleus. The element oxygen has an atomic number Z=8, while carbon has Z=6. The atomic mass of the nucleus is given by, A=Z+N, where, N, is the number of neutrons in the nucleus.
answer no 4:- Acids and bases definitely serve important functions both inside and outside the scientific laboratory. In every day life, acids and bases play a role in everything from digestion of the foods you eat to the function of the medicine you take and even the cleaning products you use.
e.g- Acetic acid (CH3COOH), vinegar - vinegar is used in cooking, preserving food and in cleaning. ⇒ Carbonic acid (H2CO3), soft drinks - carbonic acid is used in soft drinks as a preservative. ⇒Sulphuric acid is used in car batteries. ⇒ Nitric acid is used in explosives and in the making of fertilizers.
answer no 7:- Na2SO4 + CaCl2 → CaSO4 + 2 NaCl - Balanced equation |
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