Answer the following:
Which gases are dissolved in seawater in small amount?
Write any two properties of gases.
Which property of gas enables it to be used for extinguishing fire?
What is oxygen cycle?
Q. 2. Name the following:
Name the gas that is used in fire extinguisher.
Name the gas which turns into liquids under high pressure and cold conditions.
Q. 3. Give reasons:
1. We should breathe in air through our nostrils and not through our mouth.
Q. 4. What of the following is correct with respect to X?
X is bubbles of air entering water on heating.
X is soil particles entering water on heating.
X is bubbles of air present in water which are escaping on heating.
X is soil particles present in water which is escaping on heating.
Q. 5. Two balloons A and B are arranged as shown in the diagram. Answer the following questions based on the diagram.
Fig.1 Fig.2
a. What does boy do to increase the size of A?
b. The arrangement in Fig.2 shows that _________ of A and B is same.
c. What will happen if you pierce B with a pin?
d. What will you conclude from your above answers?
Answers
Answer:
Ocean dissolved gases. Seawater has many different gases dissolved in it, especially nitrogen, oxygen and carbon dioxide. It exchanges these gases with the atmosphere to keep a balance between the ocean and the atmosphere
The Properties of Gases. Gases have three characteristic properties: (1) they are easy to compress, (2) they expand to fill their containers, and (3) they occupy far more space than the liquids or solids from which they for
Carbon dioxide is primarily suitable for fighting fire classes B and C. Due to its physical properties, carbon dioxide is the only extinguishing gas that is also used in fire extinguishers and fire extinguishing devices.
The oxygen cycle is the cycle that helps move oxygen through the three main regions of the Earth, the Atmosphere, the Biosphere, and the Lithosphere. ... This also has some free oxygen produced from photosynthesis and other life processes. The largest reservoir of oxygen is the lithosphere.
Carbon dioxide (CO2) is used in some hand-held extinguishers and in fixed systems to displace oxygen and smother the fire. CO2 is used in some dry chemical (powder) hand-held and wheeled extinguishers as a propellant to expel the agent (dry chemical) which, through a chemical reaction, extinguishes the fire.
Liquid nitrogen is so cold because of the way molecules change as a gas turns to liquid. Nitrogen doesn't naturally occur in a liquid form here on Earth. Humans have to make it from air.
Because the nostrils are smaller than the mouth, air exhaled through the nose creates a back flow of air (and oxygen) into the lungs. And because we exhale more slowly through the nose than we do though the mouth, the lungs have more time to extract oxygen from the air we've already taken in.
the X means on evaporation water sets converted into liquid.
When studying the following material, make sure to completely redraw the figures on your notebook and write the formulas as you proceed. This will help you learn more. Make sure to draw horizontal fraction bars when you use one.
Answer:
Answer the following:
a. nitrogen, oxygen and carbon dioxide
b. they are easy to compress and it occupies more space than solids and liquids.
c. carbon dioxide
d. The oxygen cycle is the cycle that helps move oxygen through the three main regions of the Earth, the Atmosphere, the Biosphere, and the Lithosphere. ... This also has some free oxygen produced from photosynthesis and other life processes.
Q.2. Name the following:-
a. CO2
b. Liquid nitrogen
Q.3. Give reasons:-
1. We should breathe through our nostrils and not through our mouth because the nostrils are smaller than the mouth, air exhaled through the nose creates a back flow of air (and oxygen) into the lungs. And because we exhale more slowly through the nose than we do though the mouth, the lungs have more time to extract oxygen from the air we've already taken in.
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