Which formula represents a polar molecule?
(1) Br2 (3) CH4
(2) CO2 (4) NH3

Answers

Answer 1

Answer:

$\boxed{\left( 4 \right){\text{ N}}{{\text{H}}_{\text{3}}}}$ represents a polar molecule.

Further Explanation:

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

The bond that results from the complete transference of electrons between metals and non-metals is an ionic bond. Metals, being electropositive in nature, have the tendency to lose electrons whereas non-metals tend to gain electrons due to their high electronegativity. Cations are formed by metal atoms while non-metals form anions with the gain of electrons.

The bond formed by mutual sharing of electrons between bonded atoms is a covalent bond. Such bonds usually exist between two or more non-metals.

The polarity of a bond depends on the electronegativity difference between the bonded atoms. The more electronegative atom will attract electrons more towards itself, thereby developing negative charge on itself and leaving the less electronegative atom with positive charge. Symmetry also plays an important role to determine whether a molecule will be polar or not. If symmetry is present in a molecule it will be non-polar, even there is an electronegativity difference between the bonded atoms.

(1) ${\text{B}}{{\text{r}}_{\text{2}}}$

This is formed by the combination of two Br atoms so there is no electronegativity difference between the bonded atoms and therefore this molecule is non-polar in nature (For structure, refer to the attached image).

(2) ${\text{C}}{{\text{O}}_{\text{2}}}$

This molecule is composed of one carbon and two oxygen atoms but is symmetrical in nature so dipole moment gets cancelled out and therefore ${\text{C}}{{\text{O}}_{\text{2}}}$ is non-polar in nature (For structure, refer to the attached image).

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

This molecule consists of one carbon and four hydrogen atoms but is symmetrical in nature so dipole moment gets cancelled out and therefore ${\text{C}}{{\text{H}}_{\text{4}}}$ is non-polar in nature (For structure, refer to the attached image).

(4)

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

This molecule is composed of one nitrogen and three hydrogen atoms. But N is more electronegative than H so this is polar molecular due to electronegativity difference. Also, this is unsymmetrical molecule (For structure, refer to the attached image) and therefore it is polar in nature.

Learn more:

Identification of ionic bonding: brainly.com/question/1603987
Which is a covalent compound? brainly.com/question/2083444

Answer details:

Grade: High School

Subject: Chemistry

Chapter: Ionic and covalent compounds

Keywords: polar, non-polar, CH4, CO2, Br2, NH3, symmetrical, dipole moment, chemical bond, ionic bond, covalent bond.

Answer 2

Answer:

4)NH3

NH3 is an asymmetrical molecule with a pyramidal shape.

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Which element has 32 protons in its nucleus? phosphorus cobalt germanium sulfur

What sort of reaction happens when a hydrogen-2 atom and a hydrogen-3 atom are converted to a helium-4 atom?fission

fusion

chemical

ionic

Answers

Answer: The correct answer is fusion reaction.

Explanation:

Nuclear fission reaction is defined as the reaction in which a heavier nuclei dissociates into two or more lighter nuclei.

Nuclear fusion reaction is defined as the reaction in which lighter nuclei combines to form a heavier nuclei.

Chemical reaction is defined as the reaction in which change in composition takes place. A new substance gets formed in this type of reaction.

The chemical equation for the formation of helium-4 atom follows:

$_1^2\textrm{H}+_1^3\textrm{H}\rightarrow _2^4\textrm{He}+_0^1\textrm{n}+\text{energy}$

In the above reaction, two hydrogen nuclei are combining together to form a heavier nuclei which is helium atom.

Thus, the correct answer is fusion reaction.

I'm pretty sure the correct answer is fusion. I'm not 100% sure but I hope this helps.

PLEASE HELP!!A solution is made with 23.50 g of calcium chloride, CaCI2 and 250.0 mL of water. The water is 25.0°C. What is the freezing point of this solution?

Assume the CaCI2 dissolves completely in the water.. The density of water at 25.0°C is 0.997 g/L, and the KF of H20 is 1.858°C kg/mol.

Answers

Answer:

-4741 °C

Something is strange, because this is a weird number.

Explanation:

ΔT = Kf . m. i

That's the colligative property of freezing point depression.

Kf = Cyroscopic constant

m = molality (moles of solute in 1kg of solvent)

i = Van't Hoff factor (numbers of ions dissolved)

We assume 100% dissociation:

CaCl₂ → Ca²⁺ + 2Cl⁻ i = 3

ΔT = Freezing point of pure solvent - Freezing point of solution

Let's determine molality

Solute = CaCl₂

Moles of solute = 23.5 g . 1 mol/ 110.98 g = 0.212 moles

We determine the mass of solvent by density. Density's data is in g/L. We need to convert the volume from mL to L

250 mL . 1L / 1000 mL = 0.250 L

0.997 g/L = mass of water / volume of water → 0.997 g/L . volume of water = mass of water

0.997 g/L . 0.250L = 0.249 g

Now, we convert the mass of water from g to kg

0.249 g . 1 kg / 1000 g = 2.49×10⁻⁴ kg

Molality = mol/kg → 0.212 mol / 2.49×10⁻⁴ kg = 850.5 m

We replace data:

0°C - Freezing point of solution = 1.858 °C . kg /mol . 850.5 mol/kg . 3

Freezing point of solution = -4741 °C

Answer:

The freezing point of the solution is -4.74 °C

Explanation:

Step 1: data given

Mass of calcium chloride CaCl2 = 23.50 grams

Step 2: Calculate moles CaCl2

Moles CaCl2 = mass CaCl2 / molar mass CaCl2

Moles CaCl2 = 23.50 grams / 110.98 g/mol

Moles CaCl2 = 0.212 moles

Step 3: Calculate mass H2O

Density = mass / volume

Mass = density * volume

Mass H2O = 997 g/L * 0.250 L

MAss H2O = 249.25 grams

Step 3: calculate molality of the solution

Molality = moles CaCl2 / mass H2O

Molality = 0.212 moles / 0.24925 kg

Molality = 0.851 molal

ΔT = i*Kf*m

⇒with ΔT = the freezing point depression = TO BE DETERMNED

⇒ with i = the van't Hoff factor = 3

⇒with Kf = the freezing point depression constant of water = 1.858 °C /m

⇒with m = the molality = moles CaCl2 / mass water = 0.851 molal

ΔT = 3 * 1.858 * 0.851

ΔT = 4.74 °C

Step 4: Calculate the freezing point of the solution

ΔT = T (pure solvent) − T (solution)

ΔT = 0°C - 4.74 °C

The freezing point of the solution is -4.74 °C

NOTE: the density of water = 0.997 kg/L or 997 g/L

Which two atomic particles make up the nucleus of an atom?isotopes
protons
neutrons
electrons

Answers

Neutrons And protons I believe

Which one of the following groups of chemical compounds is composed entirely of organic compounds?A. C2H4O, CH2O, CaSO4
, C3H5
(OH)3
B. C2H2
, CH4
, CaCl2
, CaCN2
C. Ch3OCH3
, Ca3
(PO4
)2
, CO2
, H2CO3
D. C6H6
, C2H5OH, C6H5CH3
, C3H5
(NO3
)3

Answers

Answer;

D. C6H6, C2H5OH, C6H5CH3, and C3H5(NO3)3.

Explanation;

-Organic compound are chemical compounds in which one or more atoms of carbon are covalently linked to atoms of other elements, most commonly hydrogen, oxygen, or nitrogen, like the examples above in choice D. . Inorganic Compoundson the other hand, are compounds made from any elements except those compounds of carbon, such as CaSO4, CaCl2 and Ca3(PO4)2 in A, B and C respectively.

The correct answer is D.

In group A, CaSO4 is not organic; in group B, CaCl2 is not organic; in group C, Ca3(PO4)2 is not organic.

Hope this helps~

What would be the mass of 9.65x1025 molecules of water

Answers

Answer:

2890 g H₂O

General Formulas and Concepts:

Math

Pre-Algebra

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

Chemistry

Atomic Structure

Reading a Periodic Table
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

Stoichiometry

Using Dimensional Analysis

Explanation:

Step 1: Define

9.65 × 10²⁵ molecules H₂O (water)

Step 2: Identify Conversions

Avogadro's Number

Molar Mass of H - 1.01 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of H₂O - 2(1.01) + 16.00 = 18.02 g/mol

Step 3: Convert

Set up: $\displaystyle 9.65 \cdot 10^(25) \ molecules \ H_2O((1 \ mol \ H_2O)/(6.022 \cdot 10^(23) \ molecules \ H_2O))((18.02 \ g \ H_2O)/(1 \ mol \ H_2O))$
Divide/Multiply: $\displaystyle 2887.63 \ g \ H_2O$

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

2887.63 g H₂O ≈ 2890 g H₂O

Stalactites and stalagmites are examples of _____.organic sedimentary rock
contact metamorphism
extrusive igneous rock
chemical sedimentary rock

Answers

The right option is; chemical sedimentary rock

Chemical sedimentary rocks are rocks that are formed by precipitation of minerals from water. Chemical sedimentary rocks are also called evaporates and they are usually composed of the minerals halite (calcium chloride) and gypsum (calcium sulfate). Examples of chemical sedimentary rocks include stalactites, stalagmites, rock salt, flint, and some dolomites.

Answer:

The correct answer is option D, chemical sedimentary rock

Explanation:

Both stalactites and stalagmites are called drip stone as they are formed of the dripping water consisting of minerals. Both stalactites and stalagmites hang up from the ceiling of caves. These are also refereed to as Chemical sedimentary rocks formed by precipitation. The three major processes involved in the formation of these two rocks are –

a) Physical weathering – which disintegrates the minerals contained in the igneous, sedimentary, or metamorphic rock

b) Chemical weathering – which involves dissolution of weathered rock minerals

c) Precipitation of the dissolved minerals.

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