Which of the pairs of compounds below is most likely to form a solution when mixed?view available hint(s)which of the pairs of compounds below is most likely to form a solution when mixed?water and ammonia (nh3)sodium chloride (nacl) and pentane (c5h12)?

Answers

Answer 1

Answer:
Water and Ammonia will form Solution.

Explanation:

Solution is a Homogeneous mixture of two or more components. The solute present in the solvent can not be distinguished neither microscopically nor visually. This formation of Homogeneous mixture usually takes place due to greater intermolecular interactions between the Solute and Solvent. Hence, in given scenario we are not given with the amount of components, therefore we can decide on the basis of interactions between the components.

In case of Water and Ammonia there exist a stronger type of intermolecular interactions called as Hydrogen Bond Interactions as in both compounds Hydrogen atoms are attached to more electronegative atoms like Oxygen and Nitrogen. Hence, as Like Dissolves Like, so these two components will form a Solution.

While in second case, Pentane is a non polar compound while Sodium Chloride is an ionic compound with positive Na and negative Cl. So, these two compounds cannot interact with each other, Hence will fail to form a solution and results in the formation of Suspension.

Answer 2

Answer: water and ammonia or (NH3)

Related Questions

A sodium nitrate solution is 21.5% (by mass) of nano3 (molar mass = 85.00 g/mol) and the solution has a density of 1.08 g/ml. calculate the molarity (m) of the solution.

Answers

Density of the solution is 1.08 g/ml.
That means, mass of 1 ml = 1.08 g

Let's consider 1000 ml ( 1 L) of solution.
Then mass of 1 L solution = 1.08 g/ml x 1000 ml
= 1.08 x 10³ g

The mass percentage NaNO₃ is 21.5% means 21.5 g of NaNO₃ in 100 g of solution.
Hence, the mass of NaNO₃ in 1 L of solution = 1.08 x 10³ g x 21.5 / 100
= 232.2 g
Moles = mass / molar mass

Hence, moles of NaNO₃ in 1 L of solution = 232.2 g / 85.00 g/mol
= 2.73 mol

Molarity = moles of solute (mol) / Volume of the solution (L)

Hence molarity of NaNO₃ = 2.73 mol / 1 L
= 2.73 mol L⁻¹

Answer is: molarity of sodium nitrate solution is 2.73 M.
V(NaNO₃) = 1 L · 1000 mL/L = 1000 mL.
d(NaNO₃) = 1.08 g/mL.
ω(NaNO₃) = 21.5% ÷ 100% = 0.215.
mr(NaNO₃) = V(NaNO₃) · d(NaNO₃).
mr(NaNO₃) = 1000 mL · 1.08 g/mL.
mr(NaNO₃) = 1080 g.
m(NaNO₃) = ω(NaNO₃) · mr(NaNO₃).
m(NaNO₃) = 0.215 · 1080 g.
m(NaNO₃) = 232.2 g.
n(NaNO₃) = m(NaNO₃) ÷ M(NaNO₃).
n(NaNO₃) = 232.2 g ÷ 85.00 g/mol.
n(NaNO₃) = 2.73 mol.
c(NaNO₃) = n(NaNO₃) ÷ V(NaNO₃).
c(NaNO₃) = 2.73 mol ÷ 1 L.
c(NaNO₃) = 2.73 mol/L.

Which statement describes a gas condensing into a liquid?

Answers

condensation / hope this helps !

Answer:

The molecules get closer together and move more slowly.

Explanation:

from a gas to a liquid, the atoms or molecules of the substance do not change. Instead, the motion of the atoms or molecules in the substance determines its state of matter.

gas condenses to form a liquid, the molecules get closer together and move more slowly. If the molecules continue to slow down until they move so slowly that they can only vibrate against one another, then the substance becomes a solid.

What volume of 0.182 m na3po4 solution is necessary to completely react with 90.7 ml of 0.103 m cucl2?

Answers

Answer is: 34.2 mL sodium phosphate solution is necessary to completely react.
Chemical reaction: 2Na₃PO₄ + 3CuCl₂ → 6NaCl + Cu₃(PO₄)₂.
n(CuCl₂) = c(CuCl₂) · V(CuCl₂).
n(CuCl₂) = 0.103 M · 0.0907 L.
n(CuCl₂) = 0.00934 mol.
From chemical reaction: n(CuCl₂) : n(Na₃PO₄) = 3 : 2.
n(Na₃PO₄) = 2 · 0.00934 mol ÷ 3.
n(Na₃PO₄) = 0.00622 mol.
V(Na₃PO₄) = n(Na₃PO₄) ÷ c(Na₃PO₄).
V(Na₃PO₄) = 0.00622 mol ÷ 0.182 M.
V(Na₃PO₄) = 0.0342 L · 1000 mL/L = 34.2 mL.

What is the electron configuration of a chlorine ion in a compound of BeCl2?
A. [2.8.7]-
B. [2.8.8]-
C. [2.8.8]+
D. 2.8.7

Answers

chlorine has 7 valence electrons in the outermost shell. when it forms an ionic bond with Be, it takes in 1 electron and achieves the noble gas configuration
since it has one more electron it gains a negative charge of -1.
anion is then - Cl⁻
electronic configuration of Cl atom is - [2,8,7]
after taking in the electron Cl⁻ - [2,8.8]⁻
answer is
B. [2.8.8]⁻

The electronic configuration of a chlorine ion in BeCl2 compound is

[2.8.8]^- (answer B)

chlorine atom gain on electron form Be to form chloride ions
chlorine atom has a electronic configuration of 2.8.7 and it gains one electron to form chloride ion with 2.8.8 electronic configuration

The compound aluminum acetate is a strong electrolyte. write the reaction when solid aluminum acetate is put into water:

Answers

When solid aluminum acetate (Aluminum Ethanoate) is put into water, it dissociates into its constituent ions, resulting in the following reaction:

Aluminum Acetate (solid) → Aluminum ions [tex]\rm (Al^3^+)[/tex] + Acetate ions [tex]\rm (CH_3COO^-)[/tex]

When solid aluminum acetate (also known as aluminum ethanoloate) is added to water, aluminum ions [tex]\rm (Al^3^+)[/tex] and acetate ions[tex]\rm (CH_3COO^-)[/tex]are produced. The attraction between the ions and the polar water molecules causes this separation. Hydration is the process through which water molecules surround these ions.

Due to the presence of freely moving ions that promote the flow of electric current, the resulting solution develops into a powerful electrolyte that can conduct electricity. Aluminum acetate dissociates and ionizes in water, which contributes to its function as a powerful electrolyte in aqueous solution and facilitates a variety of chemical and electrochemical reactions.

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While studying chemical and physical changes, students added salt to a glass of water. They stirred the salt until it dissolved and could no longer be seen. "That's a chemical change," Sarah stated. Do you agree? Explain. A) Yes, it is a chemical change because something new is formed. B) No, it is a physical change. It is salt and water and you can get the salt back by boiling off the water. C) Yes, it is a chemical change because there was a change in the appearance of one of the components, the salt. D) No, it is a physical change. A chemical change cannot occur when you mix two compounds together like salt, NaCl, and water, H2O, without adding heat.

Answers

B. It's debatable if it's a physical or chemical change, because actual chemists don't have a hard distinction between the two.

Vinegar contains an organic compound with the following functional group. What type of organic compound is vinegar an example of?

The functional group contains a carbonyl group, which is a carbon atom double-bonded to an oxygen atom, bonded to a carbon chain on one side of its carbon atom and a hydroxyl group, which is an oxygen atom single-bonded to a hydrogen atom, on the other side.

Amine
Aldehyde
Carboxylic acid
Ester

Answers

Answer:
Option-C (Carboxylic Acid)

Explanation:
Vinegar is a solution made up of 95 % water and 5 % Acetic Acid. The structure of Acetic Acid is shown below. Acetic acid belongs to a class of organic compounds called as Caboxylic Acids. The functional group of carboxylic acid contain a carbonyl group bonded to hydroxyl group and an alkyl group (highlighted red in structure).
Due to acid nature of this class it can donate the proton bonded to oxygen atom next to carbonyl group and resulting in the formation of resonance stabilized carboxylate ion.

Other examples of Carboxylic acids are,

HCOOH Formic Acid

CH₃-COOH Acetic Acid

CH₃-CH₂-COOH Propionic Acid

CH₃-CH₂-CH₂-COOH Butanoic Acid

CH₃-CH₂-CH₂-CH₂-COOH Pentanoic Acid

Final answer:

Vinegar contains acetic acid, an organic compound classified as a carboxylic acid, due to the presence of a carboxyl group with both a carbonyl and a hydroxyl group attached to the same carbon atom.

Explanation:

Vinegar is an example of an organic compound called a carboxylic acid. Its functional group is known as the carboxyl group, which features a carbonyl group (a carbon atom double-bonded to an oxygen atom) and a hydroxyl group (an oxygen atom single-bonded to a hydrogen atom) attached to the same carbon. This unique structure with the general formula RCOOH is characteristic of carboxylic acids such as acetic acid (CH₃COOH), which gives vinegar its sour taste and pungent smell.

The presence of the carboxylic acid functional group distinguishes it from other compounds like amines, which contain nitrogen; aldehydes, which have the carbonyl group bonded to at least one hydrogen atom; and esters, which have the carbonyl group bonded to an oxygen atom that is in turn connected to another carbon group.

Acetic acid is a well-known carboxylic acid found in vinegar and has been used since ancient times for various purposes, from a condiment and a preservative to even an antibiotic and a detergent.

A student does not filter his/her saturated solution before titrating. will the calculated ksp probably be too high, too low, or unaffected? why?

Answers

If a student does not filter his/her saturated solution before titrating then ksp value will be probably higher. To understand this, consider following titration of Ca(OH)2 with HCl.

Following reaction is initiated in above titration

Ca(OH)2 + HCl → CaCl2 + H2O

Herein, Ksp stands for solubility product. It provides the imformation of amount of solute present in solution. Now, when a sparingly solution base, like calcium hydroxide, is titrated with an acid, like HCl. The reaction results in generation of salt (in present case CaCl2) and water. The solubility of salt is higher as compared to sparingly soluble base. So during the course of reaction, Ca^2+ ions present in system will combine with Cl^- ions to form CaCl2. This will result in decreasing in conc. of Ca^2+ ions in solution. To compensate for this lose, more Ca^2+ ions from Ca(OH)2 will dissolve in solution. Hence, Ksp value will increase.

Not filtering a saturated solution before titrating will likely cause the calculated Ksp to be a) too high

When a student does not filter their saturated solution before titrating, the calculated Ksp (solubility product constant) will likely be affected.

Specifically, the Ksp will probably be too high.

This is because the undissolved solid present in the unfiltered solution will falsely contribute to the ionic concentration being measured during the titration, leading to an overestimation of the dissolved ions and thus a higher calculated Ksp.

As a result, to ensure accurate determination of the Ksp, it is essential to filter the solution to remove any undissolved solute before conducting the titration.

Complete question is - A student does not filter his/her saturated solution before titrating. will the calculated ksp probably be (a) too high, (b) too low, or (c) unaffected? why?

"what is the concentration in molarity of the solution formed when"

Answers

Expand on the questio nadn provicee omore detail

What are the products of the chemical reaction that occurs when zinc metal is added to an aqueous solution of hydrochloric acid?

Answers

Zn(s) +2 HCl(aq) ---> ZnCl2(aq) +H2(g) (products are Zinc chloride and hydrogen gas)

What is the standard gibbs free energy of formation, ∆gºf, of nh3(g) at 298 k?

Answers

The standard Gibbs free energy of formation of NH3(g) at 298 K is approximately -16.5 kJ/mol.

The standard Gibbs free energy of formation (ΔG°f) for ammonia (NH3(g)) at 298 K is approximately -16.5 kJ/mol. The standard Gibbs free energy of formation for a substance is the change in Gibbs free energy when one mole of the substance is formed from its elements in their standard states. The standard state for nitrogen gas (N2) is N2(g) at 1 bar pressure, and for hydrogen gas (H2) it is H2(g) at 1 bar pressure.

please note that the given value of -16.5 kJ/mol is an approximation, and it is recommended to refer to the latest thermodynamic data sources for the most accurate and up-to-date information.

Find the ph of of 100 ml of an aqueous 0.43m baoh2 solution

Answers

Answer is: pH of barium hydroxide is 13.935.
Chemical dissociation of barium hydroxide in water:
Ba(OH)₂(aq) → Ba²⁺(aq) + 2OH⁻(aq).
c(Ba(OH)₂) = 0.43 M.
V(Ba(OH)₂) = 100 mL ÷ 1000 mL/L = 0.1 L.
n(Ba(OH)₂) = 0.43 mol/L · 0.1 L.
n(Ba(OH)₂) = 0.043 mol.
From chemical reaction: n(Ba(OH)₂) : n(OH⁻) = 1 : 2.
n(OH⁻) = 0.086 mol.
c(OH⁻) = 0.86 mol/L.
pOH = -logc(OH⁻).
pOH = 0.065.
pH = 14 - 0.065 = 13.935.

What does temperature measure?

kinetic energy of a system
potential energy of a system
how hot a system is
equilibrium of a system

Answers

Temperature measures the (average) kinetic energy of a system .

Answer:

Kinetic energy of a system .

Explanation:

Hello,

The temperature is a measure of the average kinetic energy of the atoms or molecules in the system as long as it accounts for the movement of the particles composing the system, thus, the higher the temperature, the higher the kinetic energy as the atoms or molecules could move faster and vigorously.

Best regards.

What is the name of the hybrid orbitals used by sulfur in scl2?

Answers

The name of the hybrid orbital used by sulfur in SCl2 is called

SP^3

This is because SCl2 has two single bonds and two pairs of lone electrons on the central sulfur atom. This is well shown when one draw the Lewis structure of SCl2. The electron geometry reveals that there are four electron pair which implies that the hybridization of SCl2 is sp^3.

Final answer:

The hybrid orbitals used by sulfur in SCl2 are sp3. These are formed due to bonding with two chlorine atoms, and the presence of a lone pair.

Explanation:

The hybrid orbitals used by sulfur in SCl2 are sp3 hybrid orbitals. In SCl2, sulfur uses three of its valence electrons to form sigma bonds with two chlorine atoms and the remaining two are used to form a lone pair. Hence, we have total 4, i.e., the hybridization of S in SCl2 is sp3.

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What is the limiting reactant if 0.5 g Al is reacted with 3.5 g CuCl2?

Answers

the balanced equation for the above reaction is
2Al + 3CuCl₂ --> 2AlCl₃ + 3Cu
stoichiometry of Al to CuCl₂ is 2:3
limiting reactant is when the reactant is fully consumed in the reaction therefore amount of product formed depends on amount of limiting reactant present.
number of Al moles - 0.5 g / 27 g/mol = 0.019 mol
number of CuCl₂ moles - 3.5 g / 134.5 g/mol = 0.026 mol
if Al is the limiting reactant
if 2 mol of Al reacts with 3 mol of CuCl₂
then 0.019 mol of Al reacts with - 3/2 x 0.019 = 0.029 mol of CuCl₂
but only 0.026 mol of CuCl₂ is present
therefore CuCl₂ is the limiting reactant
and 0.026 mol of CuCl₂ reacts with - 0.026/3 x 2 = 0.017 mol of Al is required
but 0.019 mol of Al is present
therefore CuCl₂ is the limiting reactant and Al is in excess

Which of the two substances would have the higher boiling point ch4 or c?

Answers

Carbon has a higher boiling point.

"at what gas temperature t e would the average translational kinetic energy of a helium atom be equal to that of an oxygen molecule in a gas of temperature 300 k"

Answers

Based on equipartition theorem, the average kinetic energy of molecules is mathematically expressed as,
<K.E.> = [tex] \frac{3kT}{2} [/tex]
where, k = Boltzmann's Constant.
T = temperature in Kelvins.

Thus from above expression, it can be seen that average kinetic energy of molecules is independent of mass and, it is dependent only on temperature.

Hence, at temperature of 300 K the average kinetic energy associated with both helium and oxygen will be same.

The average translational kinetic energy of helium s equal to that of oxygen at [tex]\boxed{300\;{\text{K}}}[/tex] .

Further Explanation:

One of the states of matter is gas. In gases, the atoms and molecules have space between them and can easily move over each other hence gases are compressible. Gases neither have fixed shape nor volume. It occupies the shape and volume of the container. The examples of matter that are gases are nitrogen and carbon dioxide.

The kinetic theory is based on the following postulates:

1. Gas molecules have a large collection of individual particles with empty space between them and the volume of each particle is very small as compared to the volume of the whole gas.

2. The gas particles are in straight-line motion or random motion until they are not collided with the wall of the container or with each other.

3. The collision between the gas particles and the wall of the containers are an elastic collision that means molecules exchange energy but they don’t lose any energy during the collision. So the total kinetic energy is constant.

The formula to calculate the average translational kinetic energy of helium is as follows:

[tex]{{\text{E}}_{{\text{He}}}} = \frac{3}{2}{\text{k}}{{\text{T}}_{{\text{He}}}}[/tex] …… (1)

Here,

[tex]{{\text{E}}_{{\text{He}}}}[/tex] is the average translational kinetic energy of helium gas.

k is the Boltzmann constant.

[tex]{{\text{T}}_{{\text{He}}}}[/tex] is the absolute temperature of helium gas.

The formula to calculate the average translational kinetic energy of oxygen is as follows:

[tex]{{\text{E}}_{{{\text{O}}_{\text{2}}}}} = \frac{3}{2}{\text{k}}{{\text{T}}_{{{\text{O}}_{\text{2}}}}}[/tex] …… (2)

Here,

[tex]{{\text{E}}_{{{\text{O}}_{\text{2}}}}}[/tex] is average translational kinetic energy of oxygen gas.

k is the Boltzmann constant.

[tex]{{\text{T}}_{{{\text{O}}_{\text{2}}}}}[/tex] is absolute temperature of oxygen gas.

Since both gases have same average translational energy. So left-hand side of equation (1) and (2) becomes equal, and therefore right-hand side of both equations can be compared as follows:

[tex]\frac{3}{2}{\text{k}}{{\text{T}}_{{{\text{O}}_2}}} = \frac{3}{2}{\text{k}}{{\text{T}}_{{\text{He}}}}[/tex] …… (3)

Rearrange equation (3) to calculate [tex]{{\text{T}}_{{{\text{O}}_{\text{2}}}}}[/tex]

[tex]{{\text{T}}_{{{\text{O}}_2}}} = {{\text{T}}_{{\text{He}}}}[/tex] …… (4)

The value of [tex]{{\text{T}}_{{\text{He}}}}[/tex] is 300 K. So according to equation (4), [tex]{{\text{T}}_{{{\text{O}}_{\text{2}}}}}[/tex] also becomes 300 K.

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Answer details:

Grade: High School

Subject: Chemistry

Chapter: Ideal gas equation

Keywords: 300 K, helium, oxygen, average translational kinetic energy, k, Boltzmann constant, absolute temperature, gas, kinetic theory, 3/2 kT, same, equal.

How many of the following species are paramagnetic? sc3+ br- mg2+ se?

Answers

Answer:
One: Selenium is Paramagnetic

Explanation:
Those compounds which have unpaired electrons are attracted towards magnet. This property is called as paramagnetism. Lets see why remaining are not paramagnetic.

Electronic configuration of Scandium;

Sc = 21 = 1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹

Sc³⁺ = 1s², 2s², 2p⁶, 3s², 3p⁶

Hence in Sc³⁺ there is no unpaired electron.

Electronic configuration of Bromine;

Br = 35 = 1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁵

Br⁻ = 1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶

Hence in Br⁻ there is no unpaired electron.

Electronic configuration of Magnesium;

Mg = 12 = 1s², 2s², 2p⁶, 3s²

Mg²⁺ = 1s², 2s², 2p⁶

Hence in Mg²⁺ there is no unpaired electron.

Electronic configuration of selenium;

Se = 34 = 1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁴

Or,

Se = 34 = 1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4px², 4py¹, 4pz¹

Hence in Se there are two unpaired electrons hence it is paramagnetic in nature.

Final answer:

Paramagnetic can be detected by the unpaired electrons in the electron configuration. In this case, out of Sc³⁺, Br⁻, Mg²⁺, and Se, only Se (Selenium) is paramagnetic because it has unpaired electrons.

Explanation:

The substances in question are Sc³⁺ (Scandium ion), Br⁻ (Bromide ion), Mg²⁺ (Magnesium ion) and Se (Selenium). To determine if these species are paramagnetic, we need to look at their electronic configurations.

Sc³⁺ (Scandium ion) has an atomic number of 21. When it loses 3 electrons to form the cation Sc³⁺, it has the same electron configuration as Argon, with all shells filled, therefore it is diamagnetic, not paramagnetic.

Br⁻ (Bromide ion) is the ion formed when Bromine (atomic number 35) gains one electron. This results in a complete electron shell, and so bromide ion is diamagnetic, not paramagnetic.

The Mg²⁺ (Magnesium ion) is formed when Magnesium (atomic number 12) loses 2 electrons. This results in a complete electron shell, making this species diamagnetic as well.

Lastly, Se (Selenium) with an atomic number of 34 has 4 unpaired electrons in its ground state and therefore is paramagnetic.

So, out of Sc³⁺, Br⁻, Mg²⁺, and Se, only Se (Selenium) is paramagnetic.

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Two of the substances in part 1 are ionic. which factors will result in a stronger ionic bond overall?

Answers

The factors that result in a stronger ionic bond are greater absolute charges and smaller ions. The similarity of ionic sizes can affect the bond's stability but doesn't directly make the bond stronger or weaker.

The following factors often affect an ionic bond's strength:

Greater absolute charges: Ionic bonds are more powerful when the positive and negative charges of the participating ions are greater. For instance, because the charges are higher in the former situation, the connection between a +2 ion (for instance, Ca²⁺) and a -2 ion (for instance, O₂) is stronger than between a +1 ion (for instance, Na⁺) and a -1 ion (for instance, Cl).

Ion bonds formed by smaller ions are frequently stronger. Ions can move closer to one another when they are smaller, which increases the electrostatic attraction between them.

Therefore, higher absolute charges and smaller ions produce an ionic bond that is stronger. Though it doesn't directly strengthen or weaken the binding, the similarity of the ionic sizes can have an impact on how stable the bond is.

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A stronger ionic bond is characterized by larger ionic charges and smaller ion sizes, resulting in greater attraction and higher lattice energy. For instance, a 2+ cation would form a stronger ionic bond with a chloride ion than a 1+ cation due to the greater charge.

The factors that will result in a stronger ionic bond overall include the magnitude of the charges and the size of the ions. A stronger ionic bond is formed when the ions involved have larger charges because larger charges result in a greater electrostatic force of attraction. Additionally, smaller ions form stronger bonds since they can get closer together, which increases the attraction between them. The lattice energy is a measure of the strength of ionic bonding.

Sodium chloride is an example of a substance with ionic bonds that result in high melting and boiling points due to the strong attractions. The strength of an ionic bond is directly proportional to the quantity of the charges and inversely proportional to the distance between the charged particles. For instance, a cation with a 2+ charge would form a stronger ionic bond with Cl− than a cation with a 1+ charge because of the greater charge magnitude.

2,2-dimethyl-4-propyloctane has how many secondary carbons? view available hint(s) 2,2-dimethyl-4-propyloctane has how many secondary carbons? five nine six seven

Answers

Structure of 2,2-dimethyl-4-propyloctane is in the Word document below.
Answer is: six secondary carbons.
Secondary carbon (2°) is attached to two other carbons. Secundary carbons are third, fifth, sixth and seventh in octane and first and second in propyl.
Primary carbon (1°) is attached to only one carbon.
Tertiary carbon (3°) is attached to three other carbons.
Quaternary carbon (4°) is attached to four other carbons.

Why do reactions have activation energies?

Answers

According to the collision theory, the following criteria must be met in order for a chemical reaction to occur: Molecules must collide with sufficientenergy, known as the activation energy, so that chemical bonds canbreak. Molecules must collide with the proper orientation.

Classify each process as an endothermic or exothermic process. drag the appropriate items to their respective bins. helpreset exothermic breaking solvent-solvent attractionsbreaking solute-solute attractions endothermic forming solute-solvent attractions

Answers

Answers:

1) Breaking Solvent-Solvent Attractions is an Endothermic Process.

2) Breaking Solute-Solute Attractions is an Endothermic Process.

3) Forming Solute-Solvent Attractions is an Exothermic Process.

Explanation:
When a solute is dissolved in solvent it either releases heat or absorbs heat depending upon the the interactions broken and interactions formed. At first, the solvent solvent interactions are broken , this process requires heat which is provided either from external source or is provided by the forming of solute solvent bond forming process which is exothermic.

When the solvent molecules get apart the solute particles enter to form interactions with elimination of heat. So, if the heat required to break solvent solvent interactions is greater than the heat provided by solute solvent interactions formation then the solute will not dissolve at room temperature and vice versa.

Breaking solvent-solvent attractions and breaking solute-solute attractions : endothermic process

Forming solute-solvent attractions : exothermic process

Further explanation

In mixing the two solutions, it will require energy to break the attraction of each solution and create a new attraction that produces energy.

If both are equal then there will be no heat released or received so that the delta H solution is 0, which indicates that the solution is ideal

The ideal solution occurs if the attractive force between the molecules is the same as the attractive force of each solute and solvent

There are 2 kinds of deviations from Raoult's Law,

1. Positive deviation

Occurs if the attractive strength between each mixture forming agent is stronger than the attractive in the mixture

(X-X, Y-Y> X-Y)

This deviation produces a positive enthalpy of solution (ΔH +) which is endothermic

2. Negative deviation

Occurs if the attractive force in the mixture is stronger than the attractive force of each substance

(X-Y> X-X, Y-Y)

This deviation produces an enthalpy of a negative value solution (ΔH -) which is exothermic

So that breaking solvent attractions and breaking attraction solutes require energy so it is called an endothermic process

While forming solute-attraction attractions will release heat so-called exothermic process

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How many sucrose molecules are in 3.0 moles of sucrose scientific

Answers

Answer:
1.80 × 10²⁴ Molecules of Sucrose

Solution:

Number of Moles and Number of Particles (molecules in given case) are related to each other as,

Moles = Number of Molecules ÷ 6.022 × 10²³

Solving for Number of Molecules,

Number of Molecules = Moles × 6.022 × 10²³

Data Given;
Moles = 3 moles

Putting values in eq,

Number of Molecules = 3 mol × 6.022 × 10²³

Number of Molecules = 1.80 × 10²⁴ Molecules

Answer:1.80 x 10^24

Explanation:

A sample of a compound contains 32.0g C and 8.0g H. It’s molar mass is 30.0/mol. What is the compounds molecular formula?

Answers

Answer:

Given mass of C is 32.0 grams
Given mass of H is 8.0 grams
Molar mass of C is 1212 g/mol
Molar mass of H is 1.01 g/mol

Thus
32.0 grams of C 8.0 grams of H →3212=2.66 moles of C→81.01=7.92 moles of H32.0 grams of C →3212=2.66 moles of C8.0 grams of H →81.01=7.92 moles of H

When we divide 7.92 by 2.66 we obtain 2.977 which is approximately 3. This means that the ratio of atoms of CC to the atoms of HH is 1:3.

Thus, empirical formula for the compound is CH3CH3.

Molar mass of CH3CH3 is 1⋅12+3⋅1.01=15.031⋅12+3⋅1.01=15.03. Since molar mass of the compound we have to find is 3030 g/mol we have tu multiply subscripts by 2.

Thus, final compound is C2H6C2H6.

How many unpaired electrons are present in a neon atom?

Answers

None. Neon has two layers of electrons, both filled completely. This means that there cannot be unpaired electrons in this atom.

Electrons are a subatomic particle with a negative charge. They are also found present in atoms.

The number of unpaired electrons in a neon atom is zero.

A neon atom is part of the first twenty element and it is the tenth element in the series. Its chemical symbol is represented as Ne, its atomic number is 10 while the atomic mass is approximately 20.

It belongs to period 2 and found in the noble gas group. As the number of protons is the same as the electrons, therefore the number of electrons is 10.

In a neon atom, its electronic configuration is [He] 2S2 2p6. All electrons here are paired (in twos) with none unpaired. Therefore, the number of unpaired electrons in a neon atom is zero.

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Cabr2 will most likely dissolve in which solvent? 1. bi3 2. h2o 3. br2 4. ccl4 5. c8h18

Answers

General principle of solubility is 'like dissolves like'

[tex] CaBr_{2} [/tex] is an ionic compound, wherein the constituent ions ([tex] Ca^{2+} [/tex] and [tex] Br^{-} [/tex]) are held by electrostatic forces of interaction.

Such ionic compounds are soluble in polar solvents.

Among the solvent mentioned in question, water ([tex] H_{2}O [/tex]) has maximum polarity. Hence, [tex] CaBr_{2} [/tex] is most likely to dissolve in [tex] H_{2}O [/tex]

When compared to sulfuric acid, how strong are carboxylic acids? when compared to sulfuric acid, how strong are carboxylic acids? just as strong weaker stronger not acidic at all?

Answers

Compared to sulphuric acid, carboxylic acids are much weaker, this is because of their overall characteristic with respect to pKa, they do not dissociate completely as to all be in their conjugate base form but will have equal amounts in both.

Sulfuric acid is a strong polyprotic acid, and has a pKa value that is even smaller than the carboxylic acid.

Compared to sulphuric acid, carboxylic acids are much weaker, this is because of their overall characteristic with respect to pKa, they do not dissociate completely as to all be in their conjugate base form but will have equal amounts in both.

What is Sulfuric acid?

Sulfuric acid is a strong polyprotic acid, and has a pKa value that is even smaller than the carboxylic acid.

Oil of vitriol, also known as sulfuric acid is a mineral acid made up of the elements hydrogen, oxygen, and sulfur, and has the chemical formula H2SO4.

It is a viscous liquid that is miscible with water. It has no color or smell. Due to its strong affinity for water vapor, pure sulfuric acid does not naturally occur; it is hygroscopic and rapidly absorbs water vapor from the air.

Therefore, Compared to sulphuric acid, carboxylic acids are much weaker, this is because of their overall characteristic with respect to pKa, they do not dissociate completely as to all be in their conjugate base form but will have equal amounts in both.

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The isotope lithium-7 has a mass of 7.0160 atomic mass units, and the isotope lithium-6 has a mass of 6.0151 atomic mass units. given the information that 92.58 percent of all lithium atoms found in nature are lithium-7 and 7.42 percent are lithium-6, calculate the atomic mass of lithium, li (atomic number 3).

Answers

atomic mass of Li is the weighted average atomic mass with regard to their percentage abundance in nature
atomic mass of Li - mass of Li-6 x % of Li-6 + mass of Li-7 x % of Li-7
substituting these values in the formula
atomic mass of Li - 6.0151 x 7.42% + 7.0160 x 92.58 %
atomic mass of Li - 0.446 + 6.495 = 6.941
therefore atomic mass of Li is 6.941

All changes in chemistry are chemical? True or false?

Answers

False; Along with chemical changes, there are also physical changes.

False. Chemistry has physical and chemical changes. Physical would resemble ripping a piece of paper in half. Chemical would be burning the piece of paper.

A solution with a volume of 1.00 l is 0.450 m in ch 3 cooh(aq) and 0.550 m in ch 3 coona(aq). what will the ph be after 0.0800 mol of hcl is added to the solution?

Answers

Before addition of HCl,

conc. of CH3COOH = 0.450 M
conc. of CH3COONa = 0.550 M

After addition of 0.08 M HCl, following reaction occurs in system:
HCl + CH3COONa ↔ CH3COOH + NaCl

Thus, in reaction system conc. of CH3COOH will increase to 0.53 M (0.08M + 0.450M)
And, conc to CH3COONa will reduce to 0.47 M (0.550M - 0.08M)

Now, conc. of H+ ions = ka [tex] \frac{[acid]}{[conjugated base]}[/tex]
where ka = dissociation constant for acid = 10^-5 for Ch3COOH

∴ conc. of H+ ions = [tex] \frac{0.53}{0.47} [/tex]
= 1.1277 x 10^-5

Now, pH = -log [H+] = -log (1.1227 x 10^-5) = 4.94

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