How are gases prepared in chemistry?
Please check below:
In chemistry labs, gases are produced from chemical reactions are mostly collected by a gas syringe.
Next, gas jars are used. Then several procedures are maintained since some gases are less dense than air, more are more dense than air.
- Upward delivery:
Here gases which are less dense than air are collected by this process. The gas jar is inverted so that lighter gases can be collected at the top and air is displaced from the gas jar.Note that, air is being displaced from the gas syringe. Thus this process is also known as Downward displacement of air. Gases which are collected by this process are Hydrogen, ammonia etc.
- Downward delivery
In this process The more dense gases are collected in a gas jar. Carbon dioxide, Nitrogen dioxide are collected by this way. Air is displaced upward thus, this process is known as upward delivery.
Now, some water insoluble or slightly soluble gases can be collected by the displacement of water in a jar.
Now, I have used the term "less dense"and "more dense". How do u calculate it???
Air is mixture of gases. Nitrogen, Hydrogen, Oxygen, Carbon dioxide. Mainly, Nitrogen and oxygen make up the mass of air which is around 30-32. Thus gases having a
#M_r# less than 30 are less dense and having a#M_r# more than 30 is more dense.Hope you get the answer.. Best of luck
- Downward delivery
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Gases can be prepared in chemistry through various methods such as:
- Direct collection: Allowing a gas to evolve from a chemical reaction and collecting it by displacement of water or air.
- Gas evolution reactions: Generating a gas through a chemical reaction where one of the products is a gas.
- Decomposition: Heating a solid or liquid compound to produce a gas as one of the products.
- Dissolution: Dissolving a solid reactant in a suitable solvent and then releasing the gas by adding a reactant or changing conditions.
- Electrolysis: Passing an electric current through an electrolyte to produce gases at the electrodes.
- Redox reactions: Reactions where gases are produced as one of the products due to changes in oxidation states of elements involved.
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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
- The ratio of rates of diffusion of two gases #X# and #Y# is 2:3. The molar mass of #X# is #27#. Find the molar mass of gas #Y#?
- If the pressure exerted on a gas in a weather balloon decreases from 1.01 atm to 0.562 atm as it rises, by what factor will the volume of the gas in the balloon increase as it rises?
- What equation encompasses Boyle's law and the relationship between pressure and temperature when the volume is constant?
- A gaseous mixture of helium and neon at #1*atm# contains a partial pressure of #0.60*atm# with respect to helium. What is #P_"Ne"#?
- A gas has a volume of 3.3 L at 25°C and 1.3 atm; at what temperature would the gas occupy 2.5 L at 1 atm?

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