1a. Determine whether the reaction below is a reduction, oxidation or neither by .rbrollot ons t an assigning the formal oxidation state for the relevant carbon in the starting material and product. NAOH Br-CH3 но-CНз + NaBr Hао circle one: reduction; oxidation; neitherC

Answer:

A. prokaryotic cell

Explanation:

We can easily identify the diagram as prokaryotic cell by the capsule shown. These organisms mostly have capsules.

Explanation

NH4Cl(s) = NH4+(aq) + Cl-(aq) AH = +3.5 kcal/mole

We have some changes that shift the equilibrium to the right, according to Le Châtelier's principle.

I will write some of them:

By Adding amount of NH4Cl or by increasing the temperature because according to the heat of the reaction this is an endothermic reaction.

Answer: Increasing the temperature of the system.

2.62 moles of glucose can react with 15.7 moles of oxygen. The balanced chemical equation for the combustion of glucose is:

C6H12O6 + 6O2 → 6CO2 + 6H2O

From the equation, we can see that for every mole of glucose that reacts, 6 moles of oxygen are required. Therefore, the number of moles of glucose that can react with 15.7 moles of oxygen can be calculated as follows:

Number of moles of glucose = (Number of moles of oxygen) / 6

Number of moles of glucose = 15.7 / 6

Number of moles of glucose = 2.62

Therefore, 2.62 moles of glucose can react with 15.7 moles of oxygen.

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Answer:

B

Explanation:

Brainlest is apprciatedddddddddddd

Answer:

1.62x10⁻³ moles of NaOH were dispensed

Explanation:

Molarity is an unit in chemistry defined as the ratio between moles of solute (In the problem, NaOH), per liter of solution.

The concentration of the solution is 0.125moles per liter. That means 1L of solution has 0.125 moles of NaOH.

The volume you dispensed in the buret was:

15.67mL - 2.73mL =

12.94mL of the 0.125M NaOH are:

12.94mL = 0.01294L * (0.125moles / L) =

The 6¹⁴ text(c) activity of an ancient artifact is found to be 0.170 bq per gram of carbon. 49,305 is its age of ancient artifact.

To find the age of the artifact, we can use the formula for exponential decay:
N(t) = N₀ e(-λt)
Where N0 is the initial amount of 6¹⁴ text(c), N(t) is the current amount, λ is the decay constant (which is related to the half-life), and t is the time elapsed.
We know that the half-life of 6¹⁴ text(c) is 5730 years. This means that after 5730 years, half of the initial amount of 6¹⁴ text(c) will have decayed. So, we can find λ as follows:
λ = ln(2) / t1/2
λ = ln(2) / 5730
λ = 0.000120968
Now, we can use the activity of the artifact to find the current amount of 6¹⁴ text(c):
A = λN
N = A / λ
N = 0.170 / 0.000120968
N = 1403.94
So, the artifact currently has 1403.94 grams of 6¹⁴ text(c). We can use this value and the known initial amount of 6¹⁴ text(c) (which would have been present in the organism when it died) to find the age of the artifact:
N(t) = N₀ e(-λt)
1403.94 = N₀e(-0.000120968t)
We can solve for t:
ln(1403.94/N0) = -0.000120968t
t = -ln(1403.94/N0) / 0.000120968
We don't know the exact initial amount of 6¹⁴ text(c) in the organism, but we can assume it was the same as the current amount in the atmosphere (which is about 1.2 × 10¹² grams). So:
t = -ln(1403.94/1.2e12) / 0.000120968
t = 49,305 years
Therefore, the artifact is approximately 49,305 years old.

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215 ml is needed for a reaction that requires 4.50 mol of h

What is molarity?

The method of figuring out how much of a material a certain chemical solution contains is known as molecularity, sometimes known as the molar concentration of a solution. It is measured by taking into account two indications, namely the volume of the solution and the quantity of solute molecules. Essentially, the volume of the solution is determined in liters. The letter "M" stands for molarity.

According to the given information:

Make use of the equation molarity = amount of moles / number of litres.

Rearrange the equations to read: no. of moles = no. of litres x molarity and no. of litres = no. of moles / molarity.

There are (0.215 x 1) = 0.215 moles of HCl in 215 ml of 1 M HCl (aq).

The volume of 12 M HCl (aq) containing 0.215 mol of HCl is equal to (0.215/12) = 0.0179 litre or 17.9 ml.

As a result, you would use 17.9 ml of 12 M HCl, which you would then dilute with water to get a total volume of 215 ml

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Answer:

H2 and O2

Explanation:

A coffee cup calorimeter is basically a type of calorimeter that operates at constant pressure. The heat measured in the calorimeter is equal to the change in enthalpy of the reaction.

This type of calorimeter is apt for reactions involving solutions where there is little or no change in volume.

It is not generally applicable to gas phase reactions such as the reaction between H2 and O2.

Answer:

You will not measure the enthalpy of the reaction of

✔ H2 and O2

in the coffee cup calorimeter because this reaction involves gases. Instead, you will use a well-known published value.

C. H2 and O2

Is Correct

a. The equilibrium constant for the reaction at 25 °C from the reaction A(aq) ⥫⥬  enzyme B (aq) and the Δ° of the reaction is -5.540 kJ·mol⁻¹ is 2.98 × 10³.

b. The Δ for the reaction at body temperature (37.0 °C) if the concentration of A is 1.5 M and the concentration of B is 0.60 M is  -8.020 kJ·mol⁻¹.

To calculate the equilibrium constant (K'eq) for the reaction at 25°C, we have the relation:

Δ° = -RT ln K'eq

Where R is the universal gas constant, T is the temperature in Kelvin, and ln is the natural logarithm.

Therefore, K'eq = e-Δ°′/RT

Substituting the given values, we have:

K'eq = e-(-5540 J/mol)/(8.314 J/mol K × 298 K)

= 2.98 × 10³

The Δ for the reaction at body temperature (37.0 °C) is given by the relation:

Δ = Δ° + RT ln(Q)

where Q is the reaction quotient at the given concentration of reactants and products.

Q = [B] / [A] = 0.60 / 1.5 = 0.4

Substituting the given values, we have:

Δ = -5540 J/mol + (8.314 J/mol K × 310 K) ln (0.4)

= -8020 J/mol

Therefore, the Δ for the reaction at body temperature is -8.020 kJ·mol⁻¹.

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Explanation:

For one thing, Net volume = Final volume - Initial volume

The result of this calculation follows the rule of subtraction.

(For addition and subtraction problems, the answer should be rounded to the same number of decimal places as the measurement with the least number of decimal places.)

So, in case in point is:

Trial 2

Initial = 1.2 mL

Final = 2.45 mL

Net = 2.45 - 1.2 = 1.25 = 1.3 (follow the rule from above)

Please, take a look and apply the rule mentioned.

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The average volume per drop is well done (3 significant figures)

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The atomic radius, Pauling ionic radius, and first ionization energy of Bromine (Br), Chlorine (Cl), Magnesium (Mg), and Sodium (Na) are given in the attachment.

A chemical element's atomic radius, which is typically the average or normal distance between the nucleus's center and the outermost isolated electron, serves as a gauge for the size of its atom.

Only by measuring the separation between the centers of two adjacent atoms and halving that distance can one determine the radius of an atom.

The ionic radius is the size of an ion.

The first ionization energy is the energy required to remove the first electron from an atom

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Answer: Gas pressure is employed in a variety of industrial operations, and it was the catalyst for the industrial revolution. Many industrial machines were powered by steam in the early twentieth century. To heat the water molecules inside massive boilers, wood was burned.

Answer:

1) Water molecules are polar.

The two molecules of hydrogen are slightly positively charged, whereas the molecule of oxygen is slightly negatively charged. This is because the electrons are more attracted to the oxygen end of the molecule than the hydrogen end.

2) Water molecules frequently organize into spheres.

This is due to the molecules' mutual attraction to one another due to gravity. They also increase surface tension, which also promotes the formation of water spheres. The hydrogen bonds that exist between molecules are what produce the surface tension. This has a balance between being weak enough to be readily disturbed and robust enough to support its own weight inside the sphere.

Hope this helps! :)

Answer:

D a substance that increases the rate of a reaction without being used up itself in a reaction.

Explanation:

Examples are

ammonia synthesis ==> iron

sulfuric acid manufacture ==> nitrogen(II) oxide, platinum

cracking of petroleum==> zeolites

hydrogenation of unsaturated hydrocarbons ==> nickel, platinum, or palladium

I hope it helps

Answer:

Hey there!

The correct answer would be D. "a substance that increases the rate of a reaction without being used up itself in a reaction."

Hope this helps :)

Answer:  Chemistry, like physics and biology, is a natural science. In fact, there is considerable overlap between chemistry and these other disciplines. Chemistry is a science that studies matter. This includes atoms, compounds, chemical reactions, and chemical bonds.

Explanation:  Chemistry is the scientific study of the properties and behavior of matter. It is a natural science that covers the elements that make up matter to the compounds made of atoms, molecules, and ions: their composition, structure, properties, behavior, and the changes they undergo during a reaction with other substances.

An example of the bimolecular elimination from the isomeric halogenated compound would be of Dehalogenation of 1,2-dibromoethane to form ethene and hydrogen bromide: H3C-CH2-Br2 --> H2C=CH2 + HBr.

Bimolecular elimination is a chemical reaction where two molecules react to form a new molecule and a neutral molecule. Isomeric halogenated compounds are compounds that have the same molecular formula but different structural arrangements.

For example, 1,2-dibromoethane and 1-bromo-2-chloroethane are isomers. Bimolecular elimination of these compounds can produce ethene and hydrogen halide (HBr or HCl) as the products. The specific product will depend on the isomeric halogenated compound and the reaction conditions.

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Answer:

C = 10

Explanation:

Given data:

Moles of O₂ = 35 mol

Moles of C₂H₆ react = ?

Solution:

Chemical equation:

2C₂H₆  + 7O₂      →    6H₂O + 4CO₂

Now we will compare the moles of O₂ with C₂H₆.

                  O₂         :        C₂H₆

                   7          :          2

                35          :        2/7×35 = 10 mol

Option C is correct.

Answer:

c. 10

Explanation:

a p e x , just took the quiz

The Cs+ ion forms the least strong ionic bond with any given anion. Ions with opposing charges are attracted to one another electrostatically to form ionic bonds, sometimes referred to as electrovalent bonds, in chemical molecules.

two ionic bonds When certain electrons are completely transported from one atom to another, ionic connections are formed. A negatively charged ion known as a cation is created when an atom loses one or more electrons. An anion, or negatively charged ion, is created when an atom accepts one or more electrons.

Significant Lessons. Ionic materials have high melting points. Ionic substances are stiff and brittle. An ionic substance splits into ions when it is dissolved in water.

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Answer:

Phycical science is the study of the body.

Explanation:

On performing the operation, we get 0.72

The operation is 3.0x104/4.0x108=312/432=0.72

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The meter was defined in 1963 as the length equal to 1650763.73 wavelengths of the orange red radiation emitted by the kryton-86 atom. 606 nm is the wavelength.

Radiation is the name for energy that comes from a source and travels through space at the speed of light. In addition to being accompanied by an electric field and a magnetic field, this energy possesses wave-like characteristics. The term "radiation" can also refer to electromagnetic waves. Electromagnetic wave spectrum electromagnetic spectrum presented in its whole. Different types of electromagnetic radiation can be found in the natural world. Among them is visible light. Gamma rays, X-rays, and ultraviolet light are the three radiation types with the most energy. X-rays and gamma rays have a lot of energy. When they interact with atoms, they have the capacity to rob electrons from them, ionizing the atom. Protons and neutrons are mixed in unstable ways in radioactive atoms. An unstable atom will release energy on its own to move into a more stable state, which is radioactivity. The energy that is released by a radioactive atom is known as ionizing radiation. The term "radioactive isotope" refers to radioactive atoms of the same element with varying neutron counts.

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Answer:

What was Niels Bohr's most important discovery? Niels Bohr proposed a model of the atom in which the electron was able to occupy only certain orbits around the nucleus. This atomic model was the first to use quantum theory, in that the electrons were limited to specific orbits around the nucleus.

Explanation:

Subjects Of Study: atomic model

The principle that allows the enthalpy of a reaction to be determined indirectly from several steps is called Hess' law.

Hess's law is a principle in thermodynamics that states that the enthalpy change of a chemical reaction is independent of the pathway between the initial and final states. This means that the total enthalpy change of a reaction can be calculated by adding the enthalpy changes of a series of intermediate reactions that connect the initial and final states, even if these intermediate reactions are not the actual steps of the reaction. Hess's law is based on the fact that enthalpy is a state function, which means that its value depends only on the initial and final states of a system, and not on the process by which the system reached those states. By using a series of intermediate reactions, it is possible to construct a path between the initial and final states that is easier to measure experimentally, and from which the enthalpy change of the overall reaction can be calculated indirectly.

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In free radical chlorination, a chlorine radical is produced and reacts with the hydrogen bonded to an cyclopropane (in this case 1-chlorobutane) with lone pairs.

An alkyl radical produced by this reaction will easily combine with a chlorine donor to produce a chlorinated alkane and a chlorine radical.Instead of being in hybridized spn orbitals, free radical chlorination lone pairs next to pi-bonds (and pi-systems) typically exist in unhybridized p orbitals. This happens most frequently with nitrogen and oxygen. Chlorination is the process of free radical chlorination disinfecting drinking water by introducing chlorine to eradicate viruses, germs, and parasites. To get drinking water with acceptable amounts of chlorine, many techniques can be utilized.

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Answer:

gravitational potential energy doesnt change srry the other one as in explaining it

41.4 grams of oxygen is essentially required for complete combustion of 3 moles of butane gas.

As you know, combustion reaction is a chemical reaction in which a substance reacts with the atmospheric oxygen (O₂) to produce carbon dioxide and water. Therefore, balanced combustion reaction of butane (C₄H₁₀) will be as follows:

C₄H₁₀+\(\frac{13}{2}\)O₂→4CO₂+5H₂O

You can observe in the above reaction that, \(\frac{13}{2}\) moles of oxygen are required for combustion of 1 mole of butane.

Therefore, going by unitary method, for complete combustion of 3 moles of butane, (\(\frac{13}{2}\)×0.398) moles of oxygen would be required.

Now, we know, number of moles = \(\frac{Given mass}{Molar mass}\)

Molar mass of oxygen is 16 g/mol

We need to find a given mass which is the mass of oxygen required when the number of moles is equal to 2.59.

Thus, given mass of oxygen or mass of oxygen required = number of moles of oxygen × molar mass of oxygen

Mass of oxygen required = 2.59 moles × 16 g/mol = 41.4 g.

Hence, 41.4 grams of oxygen is essentially required for complete combustion of 3 moles of butane gas.

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