(marking brainliest!) given the following bond energies:

h-h = 436 kj/mol
i-i = 151 kj/mol
h-i = 297 kj/mol

calculate the enthalpy change for the following reaction:
h-h + i-i ---> 2h-i

-choices are attached!

Answer:

The liquid molecules stay towards the bottom but one or two do make it all the way to the top. The molecules in the gas are also moving faster than the molecules in the liquid phase.

Answer: basically liquid molecules stay toward the bottom but one or two do make it all away to the top and the molecules in the gas are moving faster than the molecules in the liquid phase

Explanation: hope this helped

The only factor affecting the average kinetic energy of a group of gas particles is its temperature.

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Answer:

Correct

Explanation:

It means that there are an equal amount of hydroxyl and hydrogen ions, hence it is a neutral solution.

Toluene is a nonpolar molecule. Sucrose (table sugar) is a polar molecule with many hydroxyl groups. Isobutene is a nonpolar molecule .Ethylene glycol is a polar molecule.

Solubility is the ability of a substance to dissolve in a solvent to form a homogeneous mixture. It is an important property of substances, as it affects how they interact with each other in various chemical and biological processes. The solubility of a substance depends on the polarity of the molecule and the solvent in which it is being dissolved.

Water is a polar solvent, meaning it has a partial positive charge on one end and a partial negative charge on the other. Polar molecules, such as those with hydroxyl groups (-OH), tend to dissolve well in water because the partial charges on the solvent molecules can interact with the partial charges on the solute molecules, allowing them to dissolve. In contrast, nonpolar molecules, such as those with only carbon and hydrogen atoms, do not dissolve well in water, as the partial charges on the solvent molecules are not able to interact with the solute molecules.

Hexane, on the other hand, is a nonpolar solvent. It has no partial charges and does not interact with polar molecules. Nonpolar molecules, however, dissolve well in hexane because there is no charge separation in the solvent that can interfere with the interaction between the solute molecules.

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The molecular formula of the alkane represented in the mass spectrum is C5H12. To determine the molecular formula, we analyze the relative abundances of the peaks in the mass spectrum.

The peak with a mass of 43 has a 100% abundance, indicating that it represents the base peak. The peak at mass 57 has a 30% abundance, suggesting that it corresponds to a fragment with one additional carbon atom compared to the base peak. This points to the presence of a C5H12 molecule.

The alkane with the molecular formula C5H12 is known as pentane. Pentane has five carbon atoms and 12 hydrogen atoms, making it consistent with the relative abundances observed in the mass spectrum. Therefore, the molecular formula of the alkane represented in the mass spectrum is C5H12, which corresponds to the compound pentane.

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The heat causes the sugar's atoms to combine with the oxygen in the air, forming new groups of atoms. Energy is released in this chemical reaction in the form of smoke and black soot.         hope this helps

Sugar is made of carbon, hydrogen, and oxygen atoms. When heated over a candle, these elements react with the fire to turn into a liquid. The heat causes the sugar's atoms to combine with the oxygen in the air, forming new groups of atoms. Energy is released in this chemical reaction in the form of smoke and black soot.

The stoichiometric ratio between the 20 mg band reactant and the  Product hydrogen gas is 1:1/2, simply 2:1. This means that 2 atoms of hydrogen are produced for every 1 atom of zinc consumed in the reaction.

What is Stoichiometric Coefficient?

A stoichiometric coefficient is a number that appears in front of a chemical species in a balanced chemical equation, representing the number of moles of that species that react or are produced in the reaction. These coefficients are used to ensure that the law of conservation of mass is obeyed in a chemical reaction, and that the same number and types of atoms are present on both sides of the equation.

The reaction used to determine the molar volume of a gas is typically the reaction between a metal and an acid to produce hydrogen gas, which is collected and measured. The stoichiometric ratio between the reactants and products in this reaction is:

metal + acid → salt + hydrogen gas

The balanced chemical equation for the reaction between zinc metal and hydrochloric acid is:

Zn + 2 HCl → ZnCl2 + H2

From this equation, we can see that 1 mole of zinc reacts with 2 moles of hydrochloric acid to produce 1 mole of hydrogen gas. The molar mass of zinc is 65.38 g/mol, which means that 1 mole of zinc has a mass of 65.38 g. Therefore, 20 mg (0.02 g) of zinc is equivalent to:

0.02 g / 65.38 g/mol = 3.06 x 10^-4 moles of zinc

According to the stoichiometry of the reaction, 1 mole of zinc reacts with 1/2 mole of hydrogen gas. Therefore, the amount of hydrogen gas produced from 3.06 x 10^-4 moles of zinc is:

1/2 x 3.06 x 10^-4 moles = 1.53 x 10^-4 moles of hydrogen gas

So the stoichiometric ratio between the 20 mg band reactant and the product hydrogen gas is 1:1/2, or simply 2:1. This means that 2 atoms of hydrogen are produced for every 1 atom of zinc consumed in the reaction.

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Answer:

Explanation:

\(\frac{mass}{volume} =density\\mass=volume \times density=25.3 \times 0.75=18.975 ~gm\)

Answer:

absolutely correct....................

Answer:

lithium ion ,zinc ion and iodine ion will move to negative electrode while bromide,chloride and barium ion will move to positive electrode

The new volume of the balloon which was initially 3 L is 1.86 L

The new volume of the balloon can be obtained by using the combined gas equation as illustrated below:

P₁V₁ / T₁ = P₂V₂ / T₂

(1.5 × 3) / 293 = (2.5 × V₂) / 303

Cross multiply

293 × 2.5 × V₂ = 1.5 × 3 × 303

732.5 × V₂ = 1363.5

Divide both side by 732.5

V₂ = 1363.5 / 732.5

V₂ = 1.86 L

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Answer:

1.9L !!!!!

Explanation:

Answer:

Explanation:

Answer

thus, 4 moles of oxygen gas (O2) would have a mass of 128 g.

Answer:

Taking the animal kingdom as an example, we can see that it is split into two clear groups: Invertebrates - animals without a backbone. Vertebrates - animals with a backbone.

Explanation:

Answer:

hydrogen bond

Explanation:

b/c it is bond between hydrogen

The intermolecular forces between an HF molecule and a CH3OH molecule are predominantly hydrogen bonding and dipole-dipole interactions, with the possibility of London dispersion forces also playing a role.

Intermolecular forces are the forces that attract or repel molecules. There are various intermolecular forces at work in the case of a hydrogen fluoride (HF) molecule and a methanol (CH3OH) molecule.

Hydrogen bonding and dipole-dipole interactions are the primary intermolecular forces between the HF and CH3OH molecules. When a hydrogen atom covalently bound to an electronegative atom, such as nitrogen, oxygen, or fluorine, creates an electrostatic bond with another electronegative atom, this is referred to as hydrogen bonding. The hydrogen atom in the HF molecule can create a hydrogen bond with an oxygen atom in the CH3OH molecule in this situation.

Dipole-dipole interactions occur when the positive end of one molecule attracts the negative end of another. The positive hydrogen end of the HF molecule is attracted to the negative oxygen end of the CH3OH molecule in this situation.

There may also be London dispersion forces between the two molecules. The weakest of the intermolecular forces, London dispersion forces, can nonetheless play a role in the interactions between the HF and CH3OH molecules. These forces are caused by brief variations in the electron distribution within a molecule, which can cause an instantaneous dipole in an adjacent molecule.

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Answer:

Genome

Explanation:

The number of atoms in 2.0 mol B and 2.0 mol Fe is the same. This is an accurate description of them.

The mole, often known as mol, is a SI unit that counts the particles in any given substance, element or compound. 6.02214179 x \(10^{23}\) atoms, or other fundamental building blocks like molecules or ions, make up one mole.

You can write this formula as follows: Atomic or molecular number equals (moles)*(6.022*\(10^{23}\)) The following gives the relationship between the gramme and the atomic mass unit (amu): 1 amu is equal to 1 g/(6.022*\(10^{23}\)), or 1.66*\(10^{-24}\) g. The atomic mass of an element in grammes will therefore be equal to the mass of one mole of that element.

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Answer:

Ionic bond is the intermediate in strength.

Explanation:

Ionic bond is weaker than covalent bond and stronger than hydrogen bond in strength because in ionic bond, the atoms attract each other due to opposite in charge. Ionic bond is a type of bond in which one atom losses electron completely and become cation (positive charge) while the other atom receive the electron and become anion (negative charge). so they attract each other due to opposite charges.

One isotope of a metallic element has the mass number 64 and 34 neutrons in the nucleus. the cation derived from the isotope has 28 electrons. So the atomic number will be 30.

Mass number of isotope = 64

Number of neutrons = 34

So number of protons = 64 - 34 = 30

Hence atomic number of metal = 30

Thus metal is = zinc

Now as it is forming cation with 28 electrons it means it has lost two electrons so it must have a dipositive charge.

The symbol of metal ion will be Zn^+2

The number of protons in an atom's nucleus or the number of electrons in an electrically neutral atom is the atomic number of that atom. An atom of sodium, for instance, has 11 protons and 11 electrons. Therefore, the atomic number of the Na atom is equal to the sum of its protons and electrons, or 11.

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The pH of the new solution after adding the HCl is 2.82.

How to calculate pH after adding the HCl ?

To calculate the new pH of the buffer solution after adding the HCl, we need to use the Henderson-Hasselbalch equation, which relates the pH of a buffer solution to the pKa and the ratio of the concentrations of the conjugate acid and base.

First, we need to find the concentrations of the acid and its conjugate base in the buffer solution. We know that the total volume of the buffer solution is 1.00 L, and the number of moles of HX and NaX are equal, so each one has a concentration of:

C = n/V = 0.50 mol / 1.00 L = 0.50 M

Since HX is an acid, it will donate a proton (H+) to form its conjugate base (X-). Therefore, the acid and base concentrations in the buffer solution are:

[HX] = 0.50 M

[X-] = 0.50 M

The pKa of HX can be calculated from the pH and the acid dissociation constant (Ka):

pH = pKa + log([X-]/[HX])

4.925 = pKa + log(0.50/0.50)

4.925 = pKa

Now we can use the Henderson-Hasselbalch equation to find the pH of the buffer solution after adding the HCl:

pH = pKa + log([X-]/[HX])

pH = 4.925 + log(0.50/0.50)

pH = 4.925

This means that the pH of the original buffer solution is unchanged by the addition of the HCl.

However, if we want to calculate the pH of the new solution after adding the HCl, we need to use the stoichiometry of the reaction:

HX + HCl -> H2O + XCl

We know that 25.0 mL of 2.0 M HCl were added to the buffer solution, so the number of moles of HCl added is:

n(HCl) = C x V = 2.0 mol/L x 0.025 L = 0.050 mol

Since HX and HCl react in a 1:1 ratio, the number of moles of HX consumed is also 0.050 mol. This leaves us with:

n(HX) = 0.50 mol - 0.050 mol = 0.450 mol

The new volume of the solution is 400 mL + 25.0 mL = 0.425 L. Therefore, the new concentration of HX is:

[HX] = n(HX) / V = 0.450 mol / 0.425 L = 1.06 M

The new concentration of X- can be calculated from the buffer equation:

Ka = [H+][X-] / [HX]

Ka = 10⁻pKa = 10⁻⁴.925 = 7.09 x 10⁻⁵

[H+] = Ka [HX] / [X-] = 7.09 x 10⁻⁵ x 1.06 M / 0.50 M = 0.151 mM

[pH = -log[H+] = 2.82]

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A \(Fe(NO_3)_2\) solution receives a current of 4.46 A for 1.60 hours. 0.111 g of iron is plated out of the solution.

To calculate the amount of iron plated out of the solution, we need to use Faraday's law of electrolysis, which states that the amount of a substance produced at an electrode is directly proportional to the amount of electric charge passed through the electrode.

The formula for the amount of substance produced is:

Amount of substance = (Electric current × Time) / (Faraday's constant × Number of electrons transferred)

We know the electric current and the time, but we need to determine the number of electrons transferred and Faraday's constant for iron.

The chemical equation for the reduction of \(Fe(NO_3)_2\) is:

\(Fe^{2+} + 2e^{-} \rightarrow Fe\)

This means that two electrons are transferred for every \(Fe^{2+}\) ion reduced. The Faraday's constant is the charge of one mole of electrons, which is 96,485.3 C/mol.

Using these values, we can calculate the amount of iron plated out of the solution:

Amount of substance = \(\frac{4.46 \text{ A} \times 1.60 \text{ h}}{2 \times 96,485.3 \text{ C/mol}}\)

Amount of substance = 0.00198 mol

The molar mass of Fe is 55.85 g/mol, so the mass of iron plated out of the solution is:

Mass = Amount of substance × Molar mass

Mass = 0.00198 mol × 55.85 g/mol

Mass = 0.111 g

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Answer:

44

Explanation:

You multiply the length value by 1000

Answer:

0.044 km × 1000 = 44 meters

Answer:

A conditioned stimulus is a stimulus that can eventually trigger a conditioned response. In the described experiment, the conditioned stimulus was the ringing of the bell, and the conditioned response was salivation. It is important to note that the neutral stimulus becomes the conditioned stimulus

Explanation:

˙˚ʚ(´◡`)ɞ˚˙

Yes, a precipitate will form in this reaction. The precipitate that will form is CrPO₄.

The reaction is a double displacement reaction between two soluble salts, K₃PO₄ and Cr(NO₃)₃, with the two potassium nitrate (KNO₃) ions acting as a common ion. In a double displacement reaction, the cations and anions of the two reactants switch places, forming two new products.

In this reaction, the cations, K⁺ and Cr³⁺, will switch places, and the anions, PO₄³⁻ and NO₃⁻ will switch places, resulting in the formation of two new products: KNO₃and CrPO₄.

The balanced chemical equation for the reaction between K₃PO₄ and  Cr(NO₃)₃  is given below:

K₃PO₄ + Cr(NO₃)₃ → 3KNO₃ + CrPO₄ (s)

We need to identify the product which is an insoluble solid. According to the solubility rules, most nitrates are soluble in water, and only a few nitrates of metal cations are insoluble. Potassium nitrate (KNO₃ ) is a water-soluble salt, so it cannot be the product that forms a precipitate in the above reaction.

Chromium phosphate (CrPO₄), on the other hand, is a slightly soluble salt and can be expected to form a precipitate. Hence, the precipitate formed as a result of the reaction between K₃PO₄ and Cr(NO)₃ is CrPO₄ (chromium phosphate).

Therefore, option (b) is the correct answer to this question, and the precipitation reaction will be represented as:

K₃PO₄ + Cr(NO₃)₃ → 3KNO₃ + CrPO₄ (s)

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The molar mass of the gas, given that 3.25 g of the gas occupied 2.56 L is 30.66g/mol

To obtain the molar mass of the gas, we shall first obtain the number of mole of the gas. This can be obtained as follow:

PV = nRT

0.95 × 2.56 = n × 0.0821 × 280

Divide both sides by (0.0821 × 280)

n = (0.95 × 2.56) / (0.0821 × 280)

n = 0.106 mole

Haven obtain the mole of the gas, we shall determine the molar mass of the gas as follow:

Molar mass = mass / mole

Molar mass of gas = 3.25 / 0.106

Molar mass of gas = 30.66g/mol

Thus, the molar mass of the gas is 30.66g/mol

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The total charge that flows while the battery is being charged is approximately 193,939.39 Coulombs.

To calculate the total charge that flows while the battery is being charged, we can use the relationship between electrical energy, potential difference, and charge.

The electrical energy (E) stored in the battery is given as 64 mega Jules (64 MJ). The potential difference (V) provided by the battery is 330 volts. We know that the energy (E) is equal to the product of the potential difference (V) and the charge (Q):

E = V * Q

Since the charging process is 100% efficient, all the electrical energy supplied is stored in the battery. Therefore, we can rearrange the equation to solve for the charge (Q):

Q = E / V

Substituting the given values, we have:

Q = 64 MJ / 330 V

To perform the calculation, we need to convert mega Jules (MJ) to joules (J) since the SI unit of energy is joules. One mega Joule is equal to 1 million joules:

Q = (64 * 10^6 J) / 330 V

Calculating the division:

Q ≈ 193,939.39 Coulombs

Therefore, the total charge that flows while the battery is being charged is approximately 193,939.39 Coulombs.

This value represents the quantity of electric charge transferred during the charging process, and it indicates the amount of electricity that enters the battery.

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Answer:

They are organized from least to greatest by their atomic number.

Explanation:

Hope that helps!

Answer:

Explanation:

Elements are listed in numerical order by atomic number. The atomic number is the number of protons in an atom of that element. So element number 1 (hydrogen) is the first element. Every atom of hydrogen has 1 proton. Until a new element is discovered, the last element on the table is element number 118. Every atom of element 118 has 118 protons. This is the biggest difference between today's periodic table and Mendeleev's periodic table. The original table organized the elements by increasing atomic weight.

Each horizontal row on the periodic table is called a period. There are seven periods on the periodic table. Elements in the same period all have the same electron ground state energy level. As you move from left to right across a period, elements transition from displaying metal characteristics toward nonmetallic properties.

Each vertical column on the periodic table is called a group. Elements belonging to one of the 18 groups will share similar properties. Atoms of each element within a group have the same number of electrons in their outermost electron shell. For example, elements of the halogen group all have a valence of -1 and are highly reactive.

There are two rows of elements found below the main body of the periodic table. They are placed there because there wasn't room to put them where they should go. These rows of elements, the lanthanides and actinides, are special transition metals. The top row goes with period 6, while the bottom row goes with period 7.

Each element has its tile or cell in the periodic table. The exact information given for the element varies, but there is always the atomic number, the symbol for the element, and the atomic weight. The element symbol is a shorthand notation that is either one capital letter or a capital letter and a lowercase letter. The exception is the elements at the very end of the periodic table, which have placeholder names (until they are officially discovered and named) and three-letter symbols.

The two main types of elements are metals and nonmetals. There are also elements with properties intermediate between metals and nonmetals. These elements are called metalloids or semimetals. Examples of groups of elements that are metals include alkali metals, alkaline earths, basic metals, and transition metals. Examples of groups of elements that are nonmetals are the nonmetals (of course), the halogens, and the noble gases.