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1. Peter wanted to fill a water bottle. He tilted the empty bottle and dipped it in
bottle. Explain the observation.
Give one difference between
Filtration and sedimentation
b. Thermosphere and exosphere
3. Why is the atmosphere important to us? Explain.
4. How is water useful to us?
5. How pressure exerted by air is helpful to us?
6. Why does it become difficult to breathe at higher altitudes?
7. Explain why air is needed for burning,
(8. Meenal wants to fill a dropper with a medicine. She dips the dropper into
bottle, presses the dropper and pulls it out.
a. Will there be medicine in the dropper? Why?
b. What could be done to fill the medicine in the dropper? Why?
F. Answer the following questions in detail.
Answers
Answer:
1. he saw the bubbles because an empty bottle contains air and this air finds an opening. therefore the water rushes inside to filll the space and bubble come out
2. In filtration, a filter paper is used through which the mixture is passed. ... Thus, the mixture gets separated. In sedimentation, the mixture is allowed to stand for sometime until the heavier insoluble particles settle at the bottom of the container thus separating the liquid and the heavier insoluble solid
B. The exosphere is the uppermost region of Earth's atmosphere as it gradually fades into the vacuum of space. ... The layer directly below the exosphere is the thermosphere; the boundary between the two is called the thermopause. The bottom of the exosphere is sometimes also referred to as the exobase.
3. The atmosphere helps to protect living organisms from genetic damage by solar ultraviolet radiation, solar wind and cosmic rays. The current composition of the Earth's atmosphere is the product of billions of years of biochemical modification of the paleoatmosphere by living organisms.
4. Water carries nutrients to all cells in our body and oxygen to our brain. Water allows the body to absorb and assimilate minerals, vitamins, amino acids, glucose and other substances. Water flushes out toxins and waste. Water helps to regulate body temperature.
5. The pressure exerted by the air in the atmosphere is greatest at Earth's surface and falls as altitude increases. ... The pressure of air in the atmosphere allows us to do many things, from sipping through a straw to breathing.
6. At high altitudes, oxygen molecules are further apart because there is less pressure to "push" them together. This effectively means there are fewer oxygen molecules in the same volume of air as we inhale. In scientific studies, this is often referred to as "hypoxia".
7. Air contains about 21 percent oxygen, and most fires require at least 16 percent oxygen content to burn. Oxygen supports the chemical processes that occur during fire. When fuel burns, it reacts with oxygen from the surrounding air, releasing heat and generating combustion products (gases, smoke, embers, etc.).
8. A. it will be filled in the dropper the reason is atmospheric pressure
B. She dips the dropper into the bottle, presses the dropper and pulls it out . Pressing dropper will release all the liquid into the bottle. ... Pressure inside the dropper will be greater medicine will not be pulled up into the dropper
Explanation:
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