Q.1. Correct the wrong statements. Write down the corrected ones.
(1) The moon revolves around the sun.
(2) On a full moon day, the moon, the sun and the earth are positioned in this sequence.
(3) The revolutionary orbits of the earth and the moon are in the same plane.
(4) In one revolution of the moon, its orbit intersects the earth's orbit only once.
(5) It is alright to observe a solar eclipse without protecting the eyes.
(6) An annular solar eclipse occurs when the moon is in the perigee position.
Answers
Answer:
The reason behind storing the potassium and sodium in kerosene is because they are highly reactive in air and could burn any time. They are preserved in kerosene or dry mineral oil. These metals are stored in kerosene to protect this element from moisture or water content.
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Key Points
Kinetic Molecular Theory states that gas particles are in constant motion and exhibit perfectly elastic collisions.
Kinetic Molecular Theory states that gas particles are in constant motion and exhibit perfectly elastic collisions.Kinetic Molecular Theory can be used to explain both Charles’ and Boyle’s Laws.
Kinetic Molecular Theory states that gas particles are in constant motion and exhibit perfectly elastic collisions.Kinetic Molecular Theory can be used to explain both Charles’ and Boyle’s Laws.The average kinetic energy of a collection of gas particles is directly proportional to absolute temperature only
Key Terms
ideal gas: a hypothetical gas whose molecules exhibit no interaction and undergo elastic collision with each other and the walls of the container
ideal gas: a hypothetical gas whose molecules exhibit no interaction and undergo elastic collision with each other and the walls of the containermacroscopic properties: properties that can be visualized or measured by the naked eye; examples include pressure, temperature, and volume