Phase change occur in substances when the they change from one state of matter to another due to the addition or removal of heat.
<h3>What are phase changes?</h3>
Phase changes refers to the changes that occur in substances in which they change from one state of matter to another due to the addition or removal of heat.
The phase changes that occur in substances are as follows:
- change from solid to liquid known as melting
- change from liquid to gas known as vaporization
- change from solid to gas known as sublimation
- change from gas to solid known as deposition
- change from gas to liquid known as condensation
- change from liquid to solid known as freezing
Therefore, phase change occur in substances when the they change from one state of matter to another due to the addition or removal of heat.
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For Ethanol:
D = m / V
D = 3.9 g / 5 mL
D = 0.78 g/mL
For benzene:
D = 4.4 g / 5 mL
D = 0.88 g/mL
benzene has a <span>higher density.
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Answer:
HCl is not a catalyst because these are not used up during the chemical reactions.
Explanation:
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In this case, according to the performed experiments, it is possible for us to realize that HCl cannot be a catalyst for this reaction because it is used up during the reaction. This is explained by the fact that catalyst are able to return to the original form once the reaction has gone to completion; this is the example of palladium in the hydrogenation or dehydrogenation of hydrocarbons depending on the case. Moreover, we know that the catalysts increase the reaction rate because they decrease the activation energy of the reaction and therefore the student observed such increase.
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The classification of it being a metal, nonmetal, or metalliod will be useful in the process of elimination to determine what it is. Then for the second test, meauring the atomin radius will narrow it down quicker to the mystery elemet's name.
Since you determined what part of the periodic table it's on, then when measuring the atomic radius, you should be able to pinpoint what the element is more surely.
