Q1. Calculate the mass of one atom of Oxygen in . Q2.Calculate the mass of One atom Of One molecule of water in gram Q3 Do balance the chemical equations question no 29 .Q30 Q31 Q32 from page no 40 and 41 Q4 Write down important postulates of Dalton's atomic theory page no 43. Q5.Write down modern atomic theory page no 43 Q6.Write down Discovery of electrons by discharge tube experiment with diagram. Q7. Write down properties of cathode rays. page no 44

the tides are influenced by both the moon and the sun, it's easy to see that when the sun lines up with the moon and the earth, as during a new moon or full moon, the tidal effect is increased. these are known as spring tides, named not for the season, but for the fact that the water "springs" higher than normal. on the other hand, if the sun and the moon are 90 degrees apart in relation to an observer on earth as during the first quarter moon or third quarter moon, then high tides are not as high as they normally would be. this is because despite its greater distance, the sun's mass allows it to exert enough gravitational force on the oceans that it can negate some of the effects of the moon's pull. this phenomenon of lower high tides is called a neap tide. if you need more information on this topic visit moonconnection.com.