CHEMISTRY HIGH SCHOOL

Which element is likely to be the most brittle

Answers

Answer 1
Answer:

Answer : Selenium

Explanation :

The complete question is attached in the attachment.

Out of the given options, Selenium is the one which is most brittle element.

As selenium is a metalloid or a crystalline non metal which is lustrous and is ductile in nature and is highly brittle in nature.
Answer 2
Answer:

Selenium is the most brittle out of all the other elements

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Answers

I think it's the Terminals

What properties are those that describe what happens when a substance reacts with another substance? catalyst properties chemical properties physical properties mineral properties?

Answers

Answer:

Chemical properties,

Explanation:

Let us understand all the given terms

a) catalyst properties: this is the property of a substance by virtue of which it helps to modulate the rate of reaction, and itself remains unconsumed during the reaction (does not react). Example : enzymes

b) chemical properties: this is the property of a substance by virtue of which it reacts with another substance to give a new product of different structure, bonding, chemical and physical properties.

Example : hydrogen reacts with oxygen to give water.

So here the hydrogen is undergoing reaction with oxygen and this is chemical property of hydrogen.

c) Physical properties: This is the property which is related to the nature of a substance to exit in nature. for example hydrogen is a gas is its physical property not chemical.

d) mineral properties: It  is again a kind of physical property.
............ chemical properties.........

A balloon filled with helium rises when youlet it go. A balloon filled with carbon dioxide
sinks. Explain the difference.

Answers

A balloon filled with helium rises when you
let it go while a balloon filled with carbon dioxide
sinks. This is because the gases inside the balloons have different densities. Both gases have different densities where one is lighter than air (Helium) and the other is heavier than air (CO2).

Write a balanced equation for the dissolution of CaCO3? lable all phases too... So far I have CaCO3(aq)<-->Ca^2+(aq)+CO3^2-(aq) but that is wrong. Please help!!

Answers

Perhaps you need the reaction between CaCO_3 and HCl:

CaCO_3 + 2HCl\ \to\ CaCl_2 + CO_2 + H_2

Regarding the vaporization of water, which of the following is true? A. A great deal of heat must be lost by water to form hydrogen bonds and allow molecules to move farther apart. B. A great deal of heat must be absorbed by water to break hydrogen bonds and allow molecules to move farther apart. C. Vaporization of water is an exothermic process. D. Water must lose a great deal of heat before it will vaporize.

Answers

Answer: B. A great deal of heat must be absorbed by water to break hydrogen bonds and allow molecules to move farther apart.

Explanation:

Vaporization is a physical process where liquid state changes to gaseous state.

H_2O(l)\rightarrow H_2O(g)

Water molecules are bonded by strong hydrogen bonding between the hydrogen atom and the electronegative oxygen atom. Thus water molecules present on the surface are strongly attracted by the molecules present below the surface.

Thus as liquid state has to be changed to gaseous state, the heat must be supplied and the reaction will be endothermic.The heat is used to break the inter molecular forces or the hydrogen bonds present in water to convert them to randomly moving gaseous state.
B. A great deal of heat must be absorbed by water to break hydrogen bonds and allow molecules to move farther apart.

Chlorine melts at 172 k what is chlorines melting point in C

Answers

<HTML><META HTTP-EQUIV="content-type" CONTENT="text/html;charset=utf-8"> <p class="answer-detail Fw-n" id="yui_3_17_2_3_1463589225479_1149"><SPAN class="ya-q-full-text" id="yui_3_17_2_3_1463589225479_1148" itemprop="text">K = 273.15 + C <BR><BR>K = 172 so substitute <BR><BR> 172 = 273.15 + C <BR><BR> C = 172 - 273.15 = -101.15</SPAN> </DIV>
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