CHEMISTRY HIGH SCHOOL

Which formula represents a compound whose molecules are tetrahedral? (A) BH₃
(B) C₂H₂
(C) CH₄
(D) H₂O
(E) C₂H6₆

Answers

Answer 1
Answer: ......H
......|
H—C—H
..... |
..... H

methane CH4

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Answers

 

Which physical property can be measured? color density odor shape

The physical property that can be measured is the density. Color, odor and shape are properties that cannot be measured. They can be only observed through the naked eye and is subject to qualitative measurement.

Answer:

b) I took the test

Explanation:

If a solution is made by mixing 50.0 moles of KOH to 3.4 kilograms of water then what is the solutions molality?

Answers

The molality of a solution is calculated by taking the moles of solute and dividing by the kilograms of solvent.

Calculate the percent ionization of nitrous acid in a solution that is 0.311 M in nitrous acid (HNO2) and 0.189 M in potassium nitrite (KNO2). The acid dissociation constant of nitrous acid is 4.5 × 10^-4. Calculate the percent ionization of nitrous acid in a solution that is 0.311 M in nitrous acid (HNO2) and 0.189 M in potassium nitrite (KNO2). The acid dissociation constant of nitrous acid is
4.5 × 10^-4.

Answers

HNO2 =====> H+ + NO2-
Initial concentration = 0.311
C = -x,x,x 
E = 0.311-x,x,x

KNO2 ====>K+ + NO2- 
Initial concentration = 0.189 
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E = 0,0.189,0.189
 

What is the volume of 2.1 moles of chlorine gas (Cl2) at standard temperature and pressure (STP)?

Answers

Given:
 2.1 moles of chlorine gas (Cl2) at standard temperature and pressure (STP)
Required:
volume of CL2
Solution:
Use the ideal gas law
PV = nRT
V = nRT/P
V = (2.1 moles Cl2) (0.08203 L - atm / mol - K) (273K) / (1 atm)
V = 47 L

Which formula represents a nonpolar molecule?
(1) HCl (3) NH3
(2) H2O (4) CH4

Answers

Answer:

(4) CH4

Explanation:

When there are no polar bonds in a molecule, there is no permanent charge difference between one part of the molecule and another, and the molecule is nonpolar.

In option A, HCl is not nonpolar because Cl has a pretty high electronegativity of 3.16, the H-Cl bond is polar due to the electronegative difference. This means option A is wrong.

In option B, A water molecule is polar because (1) its O-H bonds are significantly polar, and (2) its bent geometry makes the distribution of those polar bonds asymmetrical. The side of the water molecule containing the more electronegative oxygen atom is partially negative, and the side of the molecule containing the less electronegative hydrogen atoms is partially positive.

In option C, NH3 is polar because it has 3 dipoles that do not cancel out. Each N-H bond is polar because N is more electronegative than H. NH3 is overall asymmetrical in its VSEPR shape, so the dipoles don't cancel out and it is therefore polar.

In option D, CH4 looks like a C in the middle with 4 H's coming off of it. It is nonpolar because the electronegative difference is balanced. The H's all have the same electronegativities, and all cancel out since they are opposite one another.

The answer to this is (4), or CH4
This is because CH4 is both symmetrical in its molecular format and also does not have any lone pairs.
Because of that, the charges on it are balanced, and if all charges are balanced, it means that the molecule is non-polar

Answer: (4) CH4

Hope this helped!! :D
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