Which of the following is an example of a molecule? (A) CO₂ (carbon dioxide). (B) H₂O (water). (C) O₂ (oxygen in atmosphere). (D) NaCI (sodium chloride:table salt). ?

Answers

Answer 1

Answer: my best guess is d ...

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Which formula represents a nonpolar molecule containing polar covalent bonds?(1) H2O (3) NH3
(2) CCl4 (4) H2

Answers

H2O and NH3 are polar molecules. H2 is a nonpolar molecule but the H-H bond is also nonpolar.
Therefore, the best choice is CCl4. Although the C-Cl bond is polar due to electronegativity differences, the molecule itself is nonpolar because the net dipole moments cancel out, given its tetrahedral molecular structure.

$\boxed{\left( 2 \right){\text{ CC}}{{\text{l}}_4}}$ represents a nonpolar molecule containing polar covalent bonds.

Further Explanation:

The chemical bond is the attraction between atoms, molecules or ions that is responsible for the formation of chemical compounds. It is formed either due to electrostatic forces or by the sharing of electrons.

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A covalent bond is a bond formed by the mutual sharing of electrons between the bonded atoms. It is also known as a molecular bond. Such bonds usually exist between two or more non-metals.

Types of covalent bonds:

1. Polar covalent bond

This bond results from the presence of electronegativity difference between the bonded atoms. For example, the bond between hydrogen and chlorine in HCl is a polar covalent bond. In this molecule, Cl is more electronegative than H.

2. Non-polar covalent bond

When there is no or very small electronegativity difference between the bonded atoms, non-polar covalent bond is formed. Here, the net dipole moment of the molecule comes out to be zero. For example, bond between carbon and hydrogen in ${\text{C}}{{\text{H}}_{\text{4}}}$ is a non-polar covalent bond.

3. Coordinate covalent bond

When both the shared electrons are provided by the same atom, coordinate covalent bond is formed. This usually exists when metals are bonded with ligands. For example, the bond formed between cobalt and ammonia in case of hexamminecobalt (III) chloride is a coordinate covalent bond.

(1) ${{\text{H}}_{\text{2}}}{\text{O}}$

Oxygen is more electronegative than carbon so the bond between O and H is polar covalent bond. But this molecule has some net dipole moment due to its asymmetry so water molecule is a polar molecule. Therefore this option is incorrect. (For structure, refer to the attached image).

(2) ${\text{CC}}{{\text{l}}_{\text{4}}}$

Chlorine is more electronegative than carbon so the bond between C and Cl is a polar bond. But the net dipole moment of this molecule comes out to be zero. So ${\text{CC}}{{\text{l}}_{\text{4}}}$ is a nonpolar molecule with polar covalent bonds and therefore this option is correct. (For structure, refer to the attached image).

(3) ${\text{N}}{{\text{H}}_{\text{3}}}$

Nitrogen is more electronegative than hydrogen so the bond between N and H is polar covalent bond. But this molecule has some net dipole moment due to its asymmetry so ammonia molecule is a polar molecule. Therefore this option is incorrect. (For structure, refer to the attached image).

(4) ${\text{N}}{{\text{H}}_{\text{3}}}$

It contains two hydrogen atoms in it. There is no electronegativity difference between both atoms and therefore this molecule is nonpolar in nature. Moreover the bond between two hydrogen atoms is also non-polar. Therefore this option is incorrect. (For structure, refer to the attached image).

Learn more:

Identification of ionic bonding: brainly.com/question/1603987
What type of bond exists between phosphorus and chlorine? brainly.com/question/81715

Answer details:

Grade: High School

Subject: Chemistry

Chapter: Ionic and covalent compounds

Keywords: polar, nonpolar, correct, incorrect, H2, CCl4, H2O, NH3, electronegativity difference, hydrogen atoms, asymmetry, dipole moment.

Oceans, lakes, ice caps, streams, and clouds are considered to part of what?A. Biosphere
B. Athenosphere
C. Hydrosphere
D. Geosphere

Answers

Hydrosphere is the correct option.Oceans, lakes, icecaps, streams and clouds are considered to be part of hydrosphere. The correctoption in regards to the given question is option “C”.Hydrosphere includes the total mass of water on the surface,underground or over the surface of earth. About 75% of the earth’s surface arecovered by oceans and so a huge part of our planet is covered in water and so hydrosphereis an important aspect. Hope I have answered your question as per your asking.

Answer=C

The hydrosphere is the total amount of water on the planet, encompassing water underground, on the surface of the planet, and in the air. This would include oceans, lakes, ice caps, streams and clouds.

When light waves hit ice, most of them bounce off and radiate back into space. Because of this, ice is best described as which kind of surface? reflective absorbent dense rough

Answers

The bouncing back of light waves observed when light waves hit ice and most of them bounce off and radiate back into space is called reflection.

What are light waves?

Light waves are a form of waves which produces visible sensitization of the eyes

Light waves have properties of waves such as:

reflection
refraction
diffraction
interference, etc.

When light waves hit ice, most of them bounce off and radiate back into space.

This property of light waves is known as reflection.

Learn more about reflection of light waves at: brainly.com/question/1191238

When light waves hit ice, most of them bounce off and radiate back into space, hence, ice is best described as a reflective surface.

What is a Reflective surface?

A reflective surface is one which can cause incident light to bounce back (reflection).

According to this question, when light waves hit ice, most of them bounce off and radiate back into space. This means that most of the incident lightreflects off the ice surface.

Therefore, the ice surface is best described as a reflective surface.

Learn more about reflection at: brainly.com/question/8553652

If 10.3 g of Mg3N2 is treated with water, what volume of gas would be collected at STP

Answers

Use the ideal gas law: PV=nRtTo find volume, move to V=(nRt)/PN=# of moles (to find, 10.3 g/100.929g)=.102 molesR=ideal gas constant(this value is 0.082056(Liters*atmospheres)/(Kelvin*mol)T= temp which at stp is 273 KelvinP= 1 atmosphereV=((.102 moles)(0.082056 Latm/Kmol)(273 K))/1 atm

Mg3N2 +6H2O → 3Mg(OH)2 +2 NH3
relative weight of Mg3N2 = (3x24)+(2x14) = 100 g/mole
mole of Mg3N2 = 10,3 g/100 g/mole = 0,103 mole
mole of NH3(g) = 2/1 x 0,103 mole = 0,206 mole
volume NH3(g) which collected at STP = mole NH3(g) x 22,4 litre/mole = 0,206 mole x 22,4 litre/mole = 4,6144 litre.

When looking up at the clouds, you can usually make out different shapes and figures with _____. cumulus clouds stratus clouds cirrus clouds altostratus clouds Desert climates can have very hot days and very cold nights. This is because _____. there is usually cloud coverage there is usually a clear sky there is usually precipitation there is usually hot or cold wind

Answers

The answer to the question stated above is cumulus clouds.
When looking up at the clouds, you can usually make out different shapes and figures with cumulus clouds.
Cumulus low-level clouds. They are the puffy, white, cotton-top clouds that look so soft.

There are two alloys, one is 1 part silver and 5 parts copper and the other 3 parts silver and 1 part copper are mixed to form 350 pounds of an alloy that is equal in silver and copper content.How many pounds of each should be used?

Answers

Lets make x equal the number times you use the 1/5 ratio alloy and y equal the number of times you use the 3/1 ratio alloy. You can make the equation (x+3y)-(5x+y)=0 and (x+3y)+(5x+y)=350
Then you can make the system of equation of:
-4x+2y=0 (this is y=2x)
6x+4y=350
You can make 6x+8x=350 by through substitution and solve of x.
14x=350
x=25 (which means y=50)

that means that the weight of the 1/5 ratio alloy is 150 pounds.
(25+(5x25))=150
the weight of the 3/1 ratio alloy is 200 pounds.
((50x3)+50)=200

I hope this helps.

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