No disadvantage, it’s important have a lid on a crucible to hand extreme temperatures. The lid may also be used to contain chemicals being heated whilst in a lab.
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Answer:
See Explanation
Explanation:
In the first case, when potassium iodide is added to an aqueous bromine solution, a chemical reaction occurs as follows;
Br2(l) + 2 KI(aq) = 2 KBr(aq) + I2(l)
This reaction produces iodine solution which is brown in colour.
Secondly, when potassium iodide is added to aqueous chlorine solution, the following reaction occurs;
2KI(aq) + Cl2(l)→ 2KCl(aq) + I2 (l)
This reaction also yields iodine solution which is brown in colour.
KI(aq) + I2(l) -------->K^+(aq) + I3^-(aq)
The I3^-(aq) solution appears brown at high concentrations.
The pressure of just nitrogen, oxygen, and argon in the air is 0.78 atm, if the total atmospheric pressure is 1.00 atm.
What distinguishes atmospheric pressure from air pressure?
As opposed to atmospheric pressure, which refers to the force of the earth's atmosphere, air pressure is the force of the air around us. Mercury barometers are used to measure atmospheric pressure, while tore gauges are used to measure air pressure.
Why is atmospheric pressure created?
What applies pressure on the atmosphere is the mass of the air molecules above. It weighs down on whatever is underneath because of the massive quantity of air molecules that collectively make up the layers of our atmosphere. Air molecules of all sizes carry some weight.
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7.A physical change occurs when a material changes shape or size but the composition of the material does not change.
8.Chemical properties can be observed only when the substances in a sample of matter are changing into different substances.
9. Materials can be classified as solids, liquids, or gases based whether their shapes and volume are definite or variable.
10. The Kinetic theory of matter states that all particles of matter are in constant motion.
