write the equation of the parabola that passes through the points (-12, 1333), (4,77), and (8,403)

Answer:

three electrons were transferred in the process

Explanation:

The electrode potential of the cathode is

E°cathode= E°cell + E°anode

E°cathode = 2.35V + (-0.74V)

E°cathode= 1.61 V

Let us look at the reduction half equation; the oxidation half equation must be;

Oxidation half equation;

Cr(s) ----> Cr^3+(aq) + 3e

The reduction half equation must now be

Reduction half equation;

3Ce^4+(aq) + 3e ----> 3Ce^3+(aq)

This implies that three electrons were transferred in the process as shown by the balanced half cell reaction equations.

Answer:

15900

Explanation:

I think hope this helps!! :D

Answer:

15900

Explanation:

Answer:

\( ZnSO_4 + Li_2CO_3 \longrightarrow ZnCO_3 + Li_2SO_4 \)

Explanation:

Here a reaction is given to us and we need to balance the equation . The given reaction is ,

\( ZnSO_4 + Li_2CO_3 \longrightarrow ZnCO_3 + Li_2SO_4 \)

So here , we can make a table as ,

\(\begin{array}{c|c} \\ LHS & RHS \\\\ Zn = 1 & Zn = 1 \\\\ SO_4 = 1 & SO_4 =1\\\\ Li = 2 & Li= 2 \\\\ CO_3 = 1 & CO_3 = 1 \end{array}\)

We can see that the number of elements and ions is same on both LHS and RHS . Hence the reaction is already balanced .

Therefore the final reaction would be same as before that is ,

\( ZnSO_4 + Li_2CO_3 \longrightarrow ZnCO_3 + Li_2SO_4 \)

I hope this helps .

The aqueous solution that has the lower freezing point is 0.60 m glucose.

Freezing point depression is the reduction in the temperature at which a liquid freezes caused by dissolved particles. The freezing point depression (ΔTf) of a solution is proportional to the molality (m) of the solute, which is the number of moles of solute per kilogram of solvent.

Freezing point depression is a colligative property, which means it depends only on the number of solute particles in the solution, not on their nature. The van't Hoff factor (i) is used to account for the dissociation of solutes in the solution. The van't Hoff factor of glucose is 1, whereas the van't Hoff factor of CaCl2 is 3.

To calculate the freezing point depression, we use the formula:

ΔTf = i * Kf * m

To calculate the freezing point depression, we use the formula:

ΔTf = i * Kf * m

The freezing point depression constant of water is 1.86 °C/m.

Thus, for the given molality of the solutions, the freezing point depression is

:ΔTfcacl2 = 3 * 1.86 °C/m * 0.60 m = 3.348 °CΔTfglucose = 1 * 1.86 °C/m * 0.60 m = 1.116 °C

Therefore, 0.60 m glucose has a lower freezing point depression than 0.60 m CaCl2.

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Doreen Schmidt should mix approximately 24 ounces of the 18% hydrochloric acid solution and (36 - 24) = 12 ounces of water to obtain 36 ounces of a 12% hydrochloric acid solution.

To find the amount of an 18% hydrochloric acid solution and the amount of water that Doreen Schmidt should mix to obtain 36 ounces of a 12% hydrochloric acid solution, we can set up an equation based on the principle of conservation of mass.

Let's denote the amount of the 18% hydrochloric acid solution as x ounces. The amount of water to be added would then be (36 - x) ounces.

The equation can be set up based on the concentration of the acid:

0.18x + 0(36 - x) = 0.12(36)

Simplifying the equation:

0.18x = 0.12(36)

0.18x = 4.32

Dividing both sides by 0.18:

x = 4.32 / 0.18

x ≈ 24

Therefore, Doreen Schmidt should mix approximately 24 ounces of the 18% hydrochloric acid solution and (36 - 24) = 12 ounces of water to obtain 36 ounces of a 12% hydrochloric acid solution.

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First of all, Z is unknown. I hope it is a mistake.

        Now, it is given that the element X has nineteen electrons. This proves that X is actually Potassium.

        As per the periodic table, both Potassium and Lithium belongs to group 1 as their valency is 1 because of the presence of only one electron in the outermost shell of electrons i.e., they lose an electron during a chemical reaction to form a stable compound. Furthermore, both are metallic.

        Magnesium belongs to group 2 and hence its valency is two, which is different from potassium though it is metallic. Similiarly, bromine belongs to group 17 and gains one electron during a reaction in contrast to potassium.

( No internal links available for reference. For clarification, check the periodic table).

In an endothermic reaction, the energy level increases as the reaction proceeds starting from the reactants and ending with the products.

An endothermic reaction is a chemical reaction that absorbs energy from its surroundings in the form of heat. This heat is generally transferred from the surroundings to the reaction mixture, and as a result, the temperature of the mixture decreases. An endothermic reaction is often depicted with a positive change in enthalpy.

The reaction absorbs heat, and the energy of the system is increased. In the forward reaction, reactants absorb heat and increase in energy, which is manifested as an increase in the reaction vessel's temperature. The molecules then begin to vibrate more quickly and vigorously.

They then overcome the activation energy barrier and form the products.The enthalpy of the products is more than the enthalpy of the reactants, as energy was absorbed in the reaction. As a result, the energy level increases as the reaction proceeds starting from the reactants and ending with the products. Therefore, the correct option is 2) The energy level increases.

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The ideal bond angle around nitrogen in N2F2, based on the VSEPR (Valence Shell Electron Pair Repulsion) theory, is d. 180°. N2F2 forms a linear molecular shape with a bond angle of 180° between the two nitrogen atoms bonded to each other.

To predict the ideal bond angles around nitrogen in N2F2 using the VSEPR theory, we first need to draw the Lewis Structure for the molecule.

N2F2 has two nitrogen atoms bonded together with one fluorine atom bonded to each nitrogen. The Lewis structure looks like this:

N≡N - F   F

Each nitrogen atom has two lone pairs of electrons, and each fluorine atom has three lone pairs of electrons.

Using the VSEPR theory, we know that the electron pairs (both bonding and non-bonding) repel each other, and therefore try to get as far away from each other as possible. This leads to the following molecular shape for N2F2:

  F
  |
N--N
  |
  F

This is a linear shape, with a bond angle of 180°.

Therefore, the answer is d. 180°.

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Answer:

12.037037

Explanation:

16.25/1.35 = 12.037037

The following mathematical operation has answer as 12.037037 and significant figures are 8.

Significant figures are the number of digits in a value, or a measurement, that can be calculated to the degree of accuracy of the value. We start counting significant figures at the first non-zero digit.

5 rules of writing Significant Figures are-

1. All non-zero numbers ARE significant.

2. Zeros between two non-zero digits ARE significant.

3. Leading zeros are NOT significant.

4. Zeros to the right of the decimal ARE significant.

5. Zeros in a whole number with the decimal shown ARE significant.

Given,

16.25 ÷ 1.35

= 12.037037

Significant figures = 8

Therefore, The following mathematical operation has answer as 12.037037 and significant figures are 8.

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In the Lewis structure of methanol (CH3OH), the OH group is placed on the outside because it is an important functional group that influences the chemical properties and reactivity of the molecule.

The Lewis structure is a representation of a molecule that shows the arrangement of atoms and valence electrons. In methanol, carbon (C) is the central atom bonded to three hydrogen (H) atoms and one oxygen (O) atom. The oxygen atom forms a single bond with carbon and also has two lone pairs of electrons.

The placement of the OH group (hydroxyl group) on the outside of the Lewis structure is significant because it determines the chemical behavior of methanol. The OH group consists of an oxygen atom bonded to a hydrogen atom and represents the presence of an alcohol functional group.

In organic chemistry, functional groups are specific arrangements of atoms within a molecule that give rise to characteristic chemical reactions and properties. The presence and position of functional groups can greatly influence the behavior and reactivity of a compound. In the case of methanol, the hydroxyl group provides the molecule with its characteristic properties.

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Non-metals will never replace metals or vice versa, they'll only replace itself or the only type of reaction that it is or element that it is.

The phase of energy metabolism that often begins with the sight, the smell, or even the thought of food is the cephalic phase.

The cephalic phase is the initial stage of digestion and energy metabolism that occurs before food even enters the body. It involves the sensory stimulation of the brain through visual, olfactory, and cognitive cues associated with food.

When we see, smell, or think about food, our brain sends signals to the digestive system, triggering the release of enzymes and hormones that prepare the body for food intake. This phase includes processes such as increased salivation, gastric acid secretion, and pancreatic enzyme release.

The cephalic phase plays a crucial role in preparing the body for efficient nutrient digestion and absorption, ultimately contributing to overall energy metabolism.

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The temperature at which the pressure will be equal to 1.75 atm, given that the tank has an initial pressure of 101325 Pa is 257.25 degrees celsius

First, we shall list out the given parameters from the question. This is shown below:

The final temperature can be obtain as follow:

P₁ / T₁ = P₂ / T₂

1 / 303 = 1.75 / T₂

Cross multiply

1 × T₂ = 303 × 1.75

T₂ = 530.25 K

Subtract 273 to obtain answer in degree celsius

T₂ = 530.25 – 273 K

T₂ = 257.25 degrees celsius

Thus, the temperature required is 257.25 degrees celsius

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Answer:

Explanation:

Groundwater spread over the years

The mass number of this atom having 53 protons, 78 neutrons, and 54 electrons will be 131.

In the field of science, we can describe a mass number of an atom as simply a measure of the protons and neutrons that are to be found in the nucleus of an atom. In chemistry, the mass number is denoted by the letter 'A'.

In the above-mentioned case, the number of protons of the atom is 53 whereas the number of neutrons is 78.

In order to calculate the mass number, we will add the number of protons and neutrons. As the result of the addition of 53+78 is 131 hence, the mass number will be 131.

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Answer:

A. Solubility

Explanation:

got it right on edge 2022

752.86 kJ energy evolved during the formation of 98.7 g of Fe.

What is evolved energy?

Evolved energy refers to the energy that is released or liberated during a chemical reaction. It represents the difference between the energy of the reactants and the energy of the products.

Calculate the number of moles of Fe using its molar mass:

Number of moles of Fe = mass / molar mass

Number of moles of Fe = 98.7 g / 55.85 g/mol

Number of moles of Fe ≈ 1.768 mol

Apply the stoichiometric ratio between Fe and Fe2O3 from the balanced equation:

According to the balanced equation, 2 moles of Fe are formed per 1 mole of Fe2O3.

Use the stoichiometric ratio and the given ∆H°rxn to calculate the energy evolved:

Energy evolved = (∆H°rxn) x (moles of Fe / stoichiometric coefficient of Fe)

Energy evolved = (-852 kJ) x (1.768 mol / 2 mol)

Energy evolved ≈ -752.86 kJ

Therefore, approximately 752.86 kJ of energy evolved during the formation of 98.7 g of Fe according to the given reaction.

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Complete Question:

How much energy is evolved during the formation of 98.7 g of Fe, according to the reaction below?

Fe2O3(s) + 2 Al(s) → Al2O3(s) + 2 Fe(s)

δh°rxn = -852 kj?

Answer:

B. 16g

Explanation:

Taking into account the reaction stoichiometry, the mass of Zn required to generate 0.15 mol of H₂ is 9.807 grams.

In first place, the balanced reaction is:

Zn + 2 HCl  → ZnCl₂ + H₂

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: If by reaction stoichiometry 1 mole of H₂ is generated by 65.38 grams of Zn, 0.15 mole of H₂ is generated by how much mass of Zn?

mass of Zn= (0.15 mole of H₂× 65.38 grams of Zn)÷ 1 mole of H₂

mass of Zn= 9.807 grams

Finally, a mass of 9.807 grams of Zn are required.

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The peptide c-n bond is a bit shorter than the c-n bond of a simple amine due to the resonance protein.  The correct answer is option: b.

The other statements are correct. The peptide bond is planar due to resonance between the carbonyl oxygen and the amide nitrogen, and rotation is permitted about the N-CA and the CA-C bonds. The omega bond refers to the bond between the C-alpha carbon and the carbonyl carbon, not between the carbonyl carbon and the amide nitrogen. Understanding the properties of the peptide bond is important in understanding the conformational properties of proteins and their biological functions. Option: b is correct.

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--The complete Question is, Select the incorrect statement.

a. the peptide bond is planar due to resonance (sharing of 2 pairs of e-) between the carbonyl oxygen and the amide nitrogen

b. the peptide c-n bond is a bit shorter than the c-n bond of a simple amine due to the resonance protein

c. rotation is permitted about the n--ca and the ca--c bonds.

d. the omega bond is the located between the carbonyl carbon and the amide nitrogen

e. none of the above ---

Answer: Mass number is 15

Explanation:

Mass number of an atom is the sum or total number of protons and neutrons present in the atom. It is represnted by the letter A

The Atomic number (Z) of an atom is defined as the number of protons in an atom and it is equal to the number of electrons present in the atom.

A= n + p

where n is the number of neutrons and p is the number of protons present in the atom

Z = p = e

Where p is the number of protons and e is the number of electrons present in the atom

Z for oxygen atom is 8

So, Z = p = 8 for oxygen atom

If n = 7

then A for oxygen atom with 7 neutrons is given by

A= n + p = 8+7 = 15.

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Answer:

10

Explanation:

Khan Academy

Answer:

Molecular formula = C₄H₆O₂

Explanation:

Given data:

Empirical formula of butanedion = C₂H₃O

Molar mass of  butanedion = 86.09 g/mol

Molecular formula  butanedion = ?

Solution:

Formula:

Molecular formula = n(empirical formula)

n = molar mass of compound / empirical formula mass

empirical formula mass  = 2×12 +1.008×3 +1×16 = 43.024

n = 86.09 / 43.024

n = 2

Molecular formula = n (empirical formula)

Molecular formula = 2 (C₂H₃O)

Molecular formula = C₄H₆O₂

Because the speed of the boulder and the pedal differs, the boulder will have greater kinetic energy. Therefore, if the pedal is moving more quickly than the boulder, the boulder will have less kinetic energy.

High kinetic Energy is (1), which is the right response. Kinetic energy is the power behind motion. If an object is moving, it has kinetic energy, and objects moving quickly have a lot of kinetic energy.

Positional or spatial energy is known as gravitational energy. Gravitational potential energy may be found in a rock that is lying on top of a hill.

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The joules are needed to convert the 12 g of the liquid water at the 15.0 °C to water vapor at 125.0 °C is 7777.6 J.

The heat expression is as follows :

q = mc ΔT

where,

m = mass of the water

c = specific heat of the water

ΔH = heat of vaporization = 2260 J/g

ΔT = change in the temperature

q = ( 12 × 4.184 ) × ( 125 - 15) + ΔH

q = 50.16 × 110 + 2260

q = 5517.6 + 2260

q = 7777.6 J

Thus, The heat required is 7777.6 J

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The mass of zinc nitrate needed to prepare 2563 ml of a 0.450 m solution is 218.66 g.

To solve this problem, we can use the formula for molarity:

Molarity (M) = moles of solute / liters of solution

We can rearrange this formula to solve for moles of solute:

moles of solute = Molarity x liters of solution

Then, we can use the moles of solute to calculate the mass of the solute using its molar mass:

mass of solute = moles of solute x molar mass

Substituting the given values into these formulas, we get:

moles of zinc nitrate = 0.450 mol/L x 2.563 L = 1.15435 mol

mass of zinc nitrate = 1.15435 mol x 189.40 g/mol = 218.66 g

Therefore, the mass of zinc nitrate needed to prepare 2563 ml of a 0.450 m solution is 218.66 g.

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Answer: K+ and Cl- ions are produced

Explanation: KCl or Potassium Chloride is an ionic compound. This means that it is formed from an ionic bond between two ions. One of these ions has to have a positive charge and the other has to have a negative charge (Cation is positive and Anion is negative). The reason behind this is that since a cation has a positive charge, it is missing an electron. An electron has a -1 charge so an atom has to lose an electron to become a cation. The cation wants an electron so it can become an atom. On the other hand, the anion has an extra electron because of its -1 charge. The anion can give an electron to the cation and both ions will complete their octets.

One way that you could argue against my reasoning is that Cl+ and K- would work because they are a cation and anions. Although that would work in theory, Cl does not form a cation. K also does not form an anion. This is because Cl is a group 17 non-metal. This means it has 7 electrons in its octet so it has a +1 charge. K on the other hand is a group 1 metal meaning it has 1 electron in its octet. Therefore, it has a -1 charge.

This means that K+ and Cl- are the only possible ions that will form KCl. When KCl dissociates in water, it dissociates back into the ions that constitute it.

Hope this helps!

Now figure out what ions NaCl and MgCl2 would produce when dissolved in water.

Answer:

Melting point

Explanation:

Melting point is a intensive property and Intensive properties can be used to help identify a sample because these characteristics do not depend on the amount of sample, nor do they change according to conditions.

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Answer:

Explanation:

Yes melting point!

Answer:

The unbalanced chemical equation is;

C. N₂O₅ + H₂O → HNO₃

Explanation:

In balancing a chemical reaction equation, only the coefficients of the terms of the reactants and/or the products are adjusted (and not the subscripts to the atoms in the compounds) to ensure that the total number of each element is the same on either side of the arrow for the chemical reaction

A coefficient term is the number multiplier of the compounds and elements in a chemical reaction

Therefore, the balanced chemical equation is obtained by changing the coefficient of the product from the implied '1' to a '2' as follows;

N₂O₅ + H₂O → 2HNO₃