PRACTICE PROBLEM Two compounds, A and B, have the same molecular formula, C6H8. Both A and B react with two molar equivalents of hydrogen in the presence of platinum to yield cyclohexane. Compound A shows three signals in its broadband decoupled NMR spectrum. Compound B shows only two NMR signals. Compound A shows an absorption maximum at 256 nm, whereas B shows no absorption maximum at wavelengths longer than 200 nm. What are the structures of A and B

Answer:

[H₃O⁺] = 0.0507 M

pH = 1.29

Explanation:

23.1 g of HCI (a strong acid) is added to water to make 1250 mL of solution. Calculate [H₃O⁺] and pH of the solution.

Step 1: Given data

Step 2: Calculate the concentration of HCl

We will use the following expression.

[HCl] = mass HCl / molar mass HCl × liters of solution

[HCl] = 2.31 g / 36.46 g/mol × 1.250 L

[HCl] = 0.0507 M

Step 3: Calculate the concentration of H₃O⁺

HCl is a strong acid according to the following equation.

HCl(aq) + H₂O(l) ⇒ H₃O⁺(aq) + Cl⁻(aq)

The molar ratio of HCl to H₃O⁺ is 1:1. Then, [H₃O⁺] = 0.0507 M.

Step 4: Calculate the pH of the solution

We will use the following expression.

pH = -log [H₃O⁺]

pH = -log 0.0507

pH = 1.29

Substituting the given values, we have (0.5 L) / (220 + 273.15 K) = V₂ / (313.15 K).Solving for V₂, we get V₂ = (0.5 L) * (313.15 K) / (220 + 273.15 K).

Calculating this expression, the volume of the balloon when fully cooled by your refrigerator would be approximately 0.38 liters when rounded to two decimal places.To convert Celsius to Kelvin, we need to add 273.15 to the Celsius temperature. Therefore, the temperature inside your refrigerator of 40 degrees Celsius is equivalent to 313.15 Kelvin.Now, let's consider the ideal gas law, which states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.Since the number of moles and pressure remain constant, we can write  the equation as V₁/T₁ = V₂/T₂, where V₁ is the initial volume of the balloon, T₁ is the initial temperature, V₂ is the final volume, and T₂ is the final temperature.

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Calculations:

Balanced Reaction :

• 2 moles of Fe : 2 moles of iron (iii) oxide

• then 13.5 moles Fe : x

X = 13.5 *2 /2 = 13.5 moles of Fe

• This means that 13.5 mole of Fe2O3 will be produce.

No. of molecules = Moles * Avogardo Number

• This means that there are 8.1297 x10^24molecules of Fe2O3 from 13.5 moles Fe.

Answer:

The active sites on the initial amount of catalyst were fully saturated

Explanation:

A catalyst is a substance which alters the rate of a chemical reaction but largely remains unaltered at the end of the reaction. A catalyst has an active site which enables it to catalyze a reaction.

The active site provides the best possible orientation for reactant molecules to collide in order to form products.

When the active sites are not fully saturated with reactant molecules, more reactant molecules can bind and the reaction can proceed much faster. However, if the active sites of the catalysts are fully saturated, the reaction has maximum velocity and cannot go anymore faster.

Addition of more catalyst molecules can however make the reaction proceed faster as a it provides more active sites for reaction for the reactants.

Answer: You would expect to see the ions turn into metal.

Hope this helps :)

Explanation:

Metal ions in their reduced form are the metal in their elemental phase. If you have a solution containing metal ions and they are reduced, you will notice the metal deposition.

Answer:

The correct answer is - anhydrous aluminum chloride is covalent whereas anhydrous magnesium chloride is ionic.

Explanation:

Anhydrous aluminum chloride is a covalent compound and we know that covalent compounds have less or no polarity. Organic compounds or solvents are mostly non-polar in nature. And it is a thumb rule that like-dissolves-like.

Thus they dissolve covalent molecules like anhydrous aluminum chloride.

Anhydrous magnesium chloride is an ionic compound that tends to interact with a polar solvent but not in a non-polar solvent such as organic solvents.

Anhydrous aluminum chloride is fairly soluble in the organic solvent while anhydrous magnesium chloride is insoluble​ because anhydrous aluminum chloride is covalent whereas anhydrous magnesium chloride is ionic.

AlCl3 quite simply accepts electrons from other atoms, in an try and get a full valence shell of eight electrons. It's why it normally behaves as a Lewis acid. In the response under, the Al atom accepts a lone pair of electrons from a Cl atom.

AlCl3 is hygroscopic and has a great affinity for water. Therefore, aluminum chloride dissolves in water partially.

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Answer:

elements are composed of

electrons with a little mass and negative charge

protons with mass and positive charge

neutrons with mass and no charge

isotopes same number of protons, different in neutrons

share me the other part of the photo to complete!!!

The balanced equation is:

Chemical equation is simply a representation of chemical reaction with symbols and formula of the reactants and products involved in the reaction.

The balancing of chemical equation is guided by the law of conservation of matter which states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one for to the other.

Thus, an unbalanced equation simply means that matter has been created or destroyed.

Now, we shall balance the equation given in the question as follow:

C₆H₆ + O₂ —> H₂O + CO₂

There are 6 atoms of H on the left side and 2 atoms on the right side. It can be balance by writing 3 before H₂O as shown below:

C₆H₆ + O₂ —> 3H₂O + CO₂

There are 6 atoms of C on the left side and 1 atom on the right side. It can be balance by writing 6 before CO₂ as shown below:

C₆H₆ + O₂ —> 3H₂O + 6CO₂

There are 2 atoms of O on the left side and a total of 15 atoms on the right side. It can be balance by writing \(\frac{15}{2}\) before O₂ as shown below:

C₆H₆ + \(\frac{15}{2}\)O₂ —> 3H₂O + 6CO₂

Multiply through by 2 to clear the fraction.

Now, the equation is balanced.

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Taking into account the Law of Conservation of Mass, the balanced reaction is:

2 C₆H₆ + 15 O₂ → 6 H₂O +  12 CO₂

In first place, you have to know that the Law of Conservation of Mass postulates that "mass is neither created nor destroyed, it only transforms."

This means that the reagents interact with each other and form new products with different physical and chemical properties than the reagents.

But the amount of matter or mass before and after the chemical reaction is always the same, that is, the amounts of the masses involved in a given reaction must be constant at all times, not changing in their proportions when the reaction ends.

So, since the mass of the reactants must be equal to the mass of the products, the number of atoms present in the reactants must be kept in the products. Therefore, the equation must be balanced.

To balance the chemical equation, you must first look at the subscripts next to each atom to find the number of atoms in the equation. If the same atom appears in more than one molecule, you must add its amounts.  

The coefficients located in front of each molecule indicate the amount of each molecule for the reaction. This coefficient can be modified to balance the equation, just as you should never alter the subscripts.

By multiplying the coefficient mentioned by the subscript, you get the amount of each element present in the reaction.

Then, taking into account all of the above, in this case you can determine the amount of elements on each side of the equation:

Left side: 6 C, 6 H and 2 O

Right side: 1 C, 2 H and 3 O

In first place, you can balanced the C:

C₆H₆ + O₂ → H₂O +  6 CO₂

Then, you have:

Left side: 6 C, 6 H and 2 O

Right side: 6 C, 2 H and 13 O

Now, balanced the H:

C₆H₆ + O₂ → 3 H₂O +  6 CO₂

Then, you have:

Left side: 6 C, 6 H and 2 O

Right side: 6 C, 6 H and 15 O

Finally, balanced the O:

C₆H₆ + \(\frac{15}{2}\) O₂ → 3 H₂O +  6 CO₂

Then, you have:

Left side: 6 C, 6 H and 15 O

Right side: 6 C, 6 H and 15 O

The reaction is balanced, but you can't balance a chemical equation with fractions, so multiplying all the stoichiometric coefficients by 2 finally obtains:

2 C₆H₆ + 15 O₂ → 6 H₂O +  12 CO₂

Finally, the balanced reaction is:

2 C₆H₆ + 15 O₂ → 6 H₂O +  12 CO₂

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Considering the definition of molar mass, the correct answer is option c): the mass of 1.85 moles H₂O₂ is 62.9 grams.

The molar mass of substance is a property defined as the amount of mass that a substance contains in one mole.

The molar mass of a compound is the sum of the molar mass of the elements that form it (whose value is found in the periodic table) multiplied by the number of times they appear in the compound.

In this case, you know the molar mass of the elements is:

So, the molar mass of the compound H₂O₂ is calculated as:

H₂O₂= 2× 1 g/mole + 2× 16 g/mole

Solving:

H₂O₂= 34 g/mole

You can apply the following rule of three: If by definition of molar mass 1 mole of the compound contains 34 grams, 1.85 moles of the compound contains how much mass?

mass= (1.85 moles× 34 grams)÷ 1 mole

mass= 62.9 grams

Finally, the mass of 1.85 moles H₂O₂ is 62.9 grams.

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The positive value of 571.6 kJwhich is the enthalpy change tells us that it is exothermic

When energy is released into the surrounding area during a chemical reaction, it's considered an exothermic reaction with ΔH < 0. Conversely, endothermic reactions result from heat absorption with ΔH > 0.

The provided equation's positive value of 571.6 kJ reveals that heat is pouring out of the reaction, causing negative changes in enthalpy and firmly placing this chemical event as exothermic in nature.

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Answer:

24.31 g/mol.

Explanation:

moles =mass/molar mass

n=w/m

The compound name for the compound structure given in the question is 2, 3-dimethlypentane

The international union of pure and applied chemistry (IUPAC) has organised a principle by which organic compounds are named. This principle includes:

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Answer:

6.022×10²³ atoms of K

Explanation:

Given data:

Mass of KClO₃ = 122.5 g

Number of atoms of K = ?

Solution:

First of all we will calculate the number of moles of KClO₃ .

Number of moles = mass/molar mass

Number of moles = 122.5 g/ 122.5 g/mol

Number of moles = 1 mol

One mole of KClO₃ have 1 mole of K atoms.

Number of atoms of K:

1 mole = 6.022×10²³ atoms of K

Thus in 122.5 g of KClO₃  6.022×10²³ atoms of K are present.

Answer:

LICl + K

Explanation:

Li + KCl ---> LiCl + K

reason: Potassium gives one chlorine to Li as in a single displacement reaction but K remains alone.

Answer:

Br-CH2-CH(CH3)2-C(Cl)H-CH(CH3)2-CHO

Explanation:

The molecule has a total of 14 carbon atoms, 13 hydrogen atoms, and 1 bromine atom. The carbon atoms are arranged in a chain with a methyl group attached to the second carbon atom, a chlorine atom attached to the third carbon atom, and two methyl groups attached to the fourth carbon atom. The fifth carbon atom has a carbonyl group attached to it.

The molecule is an aldehyde, which means that it has a carbonyl group (C=O) at the end of the chain. The carbonyl group is polar, and the oxygen atom has a partial negative charge. The hydrogen atom has a partial positive charge. This polarity makes the aldehyde group susceptible to nucleophilic attack.

The bromine and chlorine atoms are both electrophilic, which means that they have a partial positive charge. This makes them susceptible to nucleophilic attack.

The methyl groups are non-polar and do not have any significant reactivity.

The molecule is a chiral molecule, which means that it has a mirror image that is not superimposable on itself. This is because the carbon atom with the carbonyl group is attached to four different groups.

The molecule is a liquid at room temperature and has a strong odor. It is used in a variety of products, including perfumes, flavorings, and plastics.

According to the VSEPR theory, a molecule or ion of CO2 will have a flat linear shape. Option A

In CO2, the carbon atom forms double bonds with each oxygen atom. The carbon-oxygen double bonds consist of two pairs of electrons, which are arranged linearly, leading to a linear molecular shape.

The VSEPR theory suggests that electron pairs in the valence shell of the central atom repel each other and try to position themselves as far apart as possible, resulting in the linear shape.

The VSEPR theory allows us to predict the molecular geometry based on the arrangement of bonding and non-bonding electron pairs around the central atom. In the case of CO2, there are no lone pairs of electrons on the carbon atom, and the molecule has a symmetrical arrangement, leading to a linear shape. Option A

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The root mean square velocity of gaseous xenon atoms at 25°C is 56.6 m/s.

The Vrms velocity is directly proportional to the square root of temperature and inversely proportional to the square root of molar mass.

To calculate the root mean square velcoity of gaseous xenon, we use the formula below.

Formula:

Where:

From the question,

Given:

Susbtitute these values into equation 1

Hence, the root mean square velocity is 56.6 m/s.

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Answer:

Copper, Sodium, and Francium

Explanation:

The charge on the ions in an ionic compound containing cobalt(III) and fluoride ions is Co³⁺ and F⁻¹ and the formula of the compound is CoF₃.

Ionic compounds are a type of chemical compound where the oppositely-charged ions of a metal and a nonmetal are attracted to each other to form an ionic bond.

The compound formed from the bonded ions will have very different properties from the elements that make up the compound.

While atoms are neutral because they have an equal number of protons and electrons, ions have a net charge and result when an atom loses or gains electrons.

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Answer

1. 2 Cu + 1 O₂ 2 CuO

a. 1.59 moles CuO

b. 2.625 moles O₂

c. 4.88 moles CuO

Explanation

(1) The balanced equation will be

2 Cu + 1 O₂ 2 CuO

(a) If 101 grams of copper is used, how many moles of copper (II) oxide will be formed?

From the reaction;

2 moles Cu produced 2 moles CuO

Molar mass of Cu = 63.546 g/mol

Molar mass of CuO = 79.545 g/mol

That implies;

(2 mol x 63.546 g/mol) = 127.092 g Cu produced (2 mol x 79.545 g/mol) = 159.09 g CuO

Therefore, 101 g Cu will produce

Therefore the mole of CuO produced = 126.43/79.545 = 1.59 moles

(b) If 5.25 moles of copper are used, how many moles of oxygen must also be used?

From the reaction;

2 moles Cu react with 1 mole O2

Therefore, 5.25 moles Cu will react with

Hence, 2.625 moles of oxygen must be used.

(c) If 78.2 grams of oxygen react with copper, how many moles of copper (II) oxide will be produced?

First, convert 78.2 grams of oxygen to moles using the mole formula.

Molar mass of O₂ = 31.998 g/mol

So,

The final step is to use the mole ratio in the balanced equation to determine the mole of CuO that will be produced.

From the equation;

1 mole of O₂ produces 2 moles of CuO

2.44 moles O2 will now produce (2.44 moles x 2) = 4.88 moles of CuO

Therefore, 4.88 moles of CuO will be produced

We must identify the reactants in the followng equation

NH4Cl + Ba(OH)2 —> BaCl2 + NH3 + H2O

To identify the reactants we must use that

The relationship between reactants and products in a chemical reaction can be represented by a chemical equation that has this general form:

Reactants → Products

So, in this case we can see that the reactants are:

- NH4Cl : Ammonium chloride

- Ba(OH)2 : BARIUM HYDROXIDE

345678990098765435779999999999999999995699999

(a) Van der Waal's forces. Van der Waal's forces are weak electrostatic interactions between non-polar molecules.

These weak forces arise from the fluctuating dipoles within the molecules, which cause temporary charges to develop and attract each other. This attraction leads to the formation of weak intermolecular bonds, which are mainly responsible for the attraction between non-polar molecules. These forces are weak in comparison to other intermolecular forces, such as hydrogen bonding and ionic bonds, but are still important for the stability of non-polar molecules and their ability to dissolve in other non-polar solvents.Van der Waals forces are attractive intermolecular forces between molecules caused by the fluctuating dipole moments of molecules.

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complete question:The attraction that non-polar molecules have for each other is primarily caused by —

(a) Van der Waal's forces (b) Difference in electronegativities

(c) Hydrogen bonding (d) High ionisation energy​

Answer:

A full.

Explanation:

An electron needs to have a full octet do not need any more electrons. So the correct option is D.

The s and p electrons in the outermost shell are valence electrons. Core electrons are those found in the inner shell. Valence electrons are little subatomic particles that we come across as we examine and investigate an element's atom. We can trace the valence electrons and forecast the sorts of bonds with the aid of Lewis structures.

The majority of valence electrons are negatively charged particles, and they are all grouped in various orbitals or shells. Additionally, these electrons are in charge of how atoms interact with one another and create chemical bonds.

However, not every electron belongs to an atom. A chemical bond or molecule can only be created by the electrons that are found in the outermost shell. Valence electrons are the name given to this sort of electron.

Therefore the correct option is D.

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Answer:

b

Explanation:t not sure

Answer:

c

Explanation:

The reaction of a Grignard reagent with an aldehyde followed by dilute acid gives a secondary alcohol.

Given reaction is followed:

\(CH_{3}CHO \rightarrow CH_{3}COHHph\)  in presence of phMgBr, ether and \(H_{3}O^{+}\)Aldehydes or ketones' carbonyl group, C=O, reacts with organolithium or Grignard reagents to produce alcohols. The type of alcohol produced depends on the carbonyl's substitutes.

A secondary alcohol is a substance that contains a saturated carbon atom with two additional carbon atoms linked to it and a hydroxy group, or OH.

A chemical molecule with the generic formula RMgX, where X is a halogen and R is an organic group, typically an alkyl or aryl, is known as a Grignard reagent or Grignard compound.

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Answer:

ang hirap na nag tanung

strontium sulfate is WHITE CRYSTALLINE POWDER WITHOUT A SMELL. heating steadily above 1580°C causes decomposition. Sulfur oxides and other harmful and corrosive gases are produced as a result.

Sr(NO3)2 + H2SO4 -> 2HNO3 + SrSO4 is molecular equation

SrSO4 ( strontium sulfate will precipitate )

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I hope I'm not late, but it's "Cooler air over land moves toward the water, where it is warmed by radiation.​"