Is sweating evaporation or condensation?
Sweat may be a cause of condensation as it evaporates and passes through your clothing system, condensing on an outer layer. We are losing moisture through our sweat glands all the time. This is called insensible sweat. When we are hot the skin can be wet with sweat which is much more obvious.
How does evaporation affect condensation?
Evaporation and condensation are two processes through which matter changes from one state to another. In evaporation, matter changes from a liquid to a gas. In condensation, matter changes from a gas to a liquid. All matter is made of tiny moving particles called molecules.
What triggers evaporation?
When water is heated, it evaporates. The molecules move and vibrate so quickly that they escape into the atmosphere as molecules of water vapor. Evaporation is a very important part of the water cycle. Heat from the sun, or solar energy, powers the evaporation process.
Is evaporation and condensation reversible?
Hover for more information. Evaporation is a reversible physical reaction. The reverse process is water condensing from the atmosphere onto a surface.
Is evaporation reversible change?
Evaporation is a reversible physical reaction. Evaporation involves the change in state from liquid to gas. It’s not the same as vaporization, or boiling, because it occurs at temperatures below the boiling point of the substance.
Is Jelly reversible or irreversible?
Well, what about setting jelly? Irreversible. Why? Because if you make jelly and it sets you can’t get back to the solid lumps in the packet.
Is melting of candle wax a permanent change?
The process of a solid becoming a liquid is called melting. Melting of wax, by itself, involves a change of state from solid to liquid. When the physical state of a substance changes, no new products are formed. Hence, melting of wax is physical change and the correct answer is option A.
Why does water rise up when candle is extinguished by inverting a glass jar?
Because twice as much oxygen is burned than carbon dioxide released, the air volume decreases. When the oxygen is depleted, the candle goes out and the air cools. The volume of the air decreases and the water rises. The temporary temperature change delays the rise of the water.
What happens when you put a jar over a candle?
The substance that reacts with the candle wax is oxygen. It comes from the air. Putting the jar over the candle keeps oxygen from outside the jar from getting in. Running out of oxygen makes the flame go out.
Why will the candle keep burning in the situation?
Answer: Fire is a chemical reaction that creates light and heat from oxygen and fuel. A lit candle needs to draw oxygen from the air in order to continue burning. If you limit the amount of air available, the candle’s flame eventually goes out once it uses up all the oxygen.
What do you observe when a burning candle is covered with an inverted jar?
Explanation: When a burning candle is covered with an inverted jar, the candle flame extinguishes soon after. This happens because in order for the candle to burn, it requires the presence of oxygen. This supply of oxygen gets limited when the jar is placed on the flame, thus extinguishing the flame, eventually.
What happened to the fire in the burning stick and paper when it was covered by the drinking glass Why did the flame stop burning?
Answer: The fire went out since the oxygen needed in the combustion process is cut off by the glass.
Can you explain why did the candle in the smaller glass went off first which gases does the inverted glass contain now?
Burning of a candle needs continuous supply of oxygen present in the air. By covering the candle with a jar,the supply of oxygen gets cut and as there is only limited quantity of oxygen left the candle burns for a moment then goes off completely. Since there is no oxygen left in the jar.
Why does a lighted candle get extinguished when covered?
This happens because oxygen in the air inside the glass tumbler is utilized in burning the candle. All the oxygen gets converted into carbon dioxide. Carbon dioxide does not support burning and hence candle stops burning.
What happens if you cover a lighted candle?
What happens if you cover a lit candle in a water basin with a glass? The burning candle produces carbon dioxide and water in the form of water vapor. The glass becomes foggy due to this water. The flame goes out, of course, from a lack of enough oxygen in the glass.
Can you put the lid on a candle after blowing it out?
Candle jars usually come with a lid, which can be used when it’s time to extinguish the flame. Simply blow out the candle gently and then cover immediately with the lid to prevent dust and dirt from getting on the wax and wick. It also helps trap the smoke.
What was removed from the air into the jar to allow space for the water to come in?
The ‘consumed oxygen’ misconception Candle wax is a form of hydrocarbon. When it burns, oxygen (from air) reacts with the wax to form two new gases; carbon dioxide and water vapour. Some of the carbon dioxide would dissolve into the water and most of the water vapour would condense back into liquid water.