Substituents on an aromatic ring can have several effects on electrophilic aromatic substitution reactions. Substituents can activate or deactivate the ring to substitution, donate or withdraw electrons inductively, donate or withdraw electrons through resonance, and direct substitution either to the ortho/para or to the meta positions.
1. From the following list, select the substituents that have the indicated property. The substituents are written as -XY, where X is the atom directly bound to the aromatic ring.
a. Activation of the ring towards substitution
i. -CF3
ii. -NO2
iii. -OCOCH3
iv. -NH2

Answer:

yes

Explanation:

its not that hard to get

Answer:

Metals with larger grains have less grain-boundary area per unit volume, and hence will not be as able to generate as many entanglements at grain boundaries, thus the strength will be lower.

Answer:

1s

not allowed

3d

not allowed

not allowed

4d

5f

Explanation:

Coefficient = n

l = n-1, where 0=s, 1=p, 2=d, 3=f

ml = -l to +l

The quantum numbers are used to show the arrangement of electrons in orbitals in an atom.

There are four sets of quantum numbers;

Now we are going to assign orbitals to each arrangement of quantum numbers as shown below;

n        l         ml          orbital

1         0        0            1s

3        -3        2           not allowed

3        2        -2           3d

2        0        -1           not allowed

0        0        0           not allowed

4        2         1           4d

5        3         0          5f

We can see that s p d f corresponds to l = 0 1 2 3.

Also note that;

When l = 0 then m= 0

When l= 1, m = -1, 0, 1

When l= 2  m = -2, -1, 0, 1, 2

When l =3  m = -3, -2, -1, 0, 1, 2, 3

Note that n must take positive integer values greater than zero.

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Answer:

ok, here is your answer

Explanation:

AI-generated answer

To find the mass of oxygen that reacted, we need to use the Law of Conservation of Mass, which states that in a chemical reaction, the mass of the reactants equals the mass of the products.

First, we need to find the number of moles of hydrogen that reacted:

Molar mass of hydrogen (H₂) = 2.016 g/mol

Number of moles of H₂ = mass/molar mass = 46.2 g/2.016 g/mol = 22.92 mol

Next, we need to use the balanced chemical equation to find the number of moles of water produced:

hydrogen + oxygen → water

2H₂ + O₂ → 2H₂O

From the equation, we can see that for every 2 moles of H₂, 1 mole of O₂ is required to produce 2 moles of H₂O. Therefore, the number of moles of O₂ required to produce 22.92 moles of H₂O is:

Number of moles of O₂ = 1/2 x 22.92 mol = 11.46 mol

Finally, we can find the mass of oxygen that reacted by using its molar mass:

Molar mass of oxygen (O₂) = 32.00 g/mol

Mass of oxygen = number of moles x molar mass = 11.46 mol x 32.00 g/mol = 366.72 g

Therefore, the mass of oxygen that reacted is 366.72 g.

The new volume of the gas when the temperature is;

a) lowered to -20°C is 22.67L

b) Increased to 373 K is 33.42L

The relationship between the volume of a gas and its temperature is described by Charles law and represented by the following expression:

V₁/T₁ = V₂/T₂

Where;

a). 26.7/298 = V/253

V = 22.67L

b). 26.7/298 = V/373

V = 33.42L

Therefore, the new volume at the differing temperatures are as described above.

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Explanation:

density= mass × volume

3.35×5

=. 16 .75

Answer:

The molar concentration of the crystal violet solution is more concentrated than that of the sodium hydroxide solution. It is because the crystal violet solution has more solute in it compared to the sodium hydroxide.

One career in which it would be important for people to understand the gas laws is chemist.

A chemist is a person who specializes in the science of chemistry, especially at a professional level.

The gas laws are an integral component of chemistry as a subject or course of study. The fundamental gas laws in chemistry are as follows;

These laws explain the interaction of an ideal gas, which is a gas whose molecules exhibit no interaction, and undergo elastic collision with each other and with the walls of the container.

Therefore, being a chemist as a career path means understanding the gas laws.

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Answer:

f(-1) = -1.

Explanation:

To find the value of f(-1), we need to substitute -1 for x in the function f(x) = -2 + 1. This gives us:

f(-1) = -2 + 1

f(-1) = -1

Therefore, f(-1) = -1.

Answer:

2.9 psi

Explanation:

Pressure (mmHg) = 150 mmHg

Pressure (psi) =?

The pressure in pound per square inch (psi) can be obtained as follow:

51.715 mmHg = 1 psi

Therefore,

150 mmHg = 150 mmHg × 1 psi / 51.715 mmHg

150 mmHg = 2.9 psi

Thus, pressure in pound per square inch (psi) is 2.9 psi.

Answer:

C

Explanation:

The battery is chemical energy. When it is used in the flashlight, it produces light and thermal energy

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The change in entropy for the crystallization of 1.25 moles of butane can be calculated using the formula ΔS = ΔH_fusion / T, where ΔS is the change in entropy, ΔH_fusion is the enthalpy of fusion, and T is the temperature in Kelvin.

In the given problem, the enthalpy of fusion of butane is 24.3 kJ/mol. To convert this to J/mol, we multiply it by 1000, resulting in 24,300 J/mol. The melting point of butane is -0.5°C, which is equivalent to 272.65 K.

Using the formula, we can calculate the change in entropy as follows:

ΔS = (24,300 J/mol) / 272.65 K

    ≈ 89.25 J/(mol·K)

Therefore, the change in entropy for the crystallization of 1.25 moles of butane is approximately 89.25 J/(mol·K).

The change in entropy (ΔS) for the crystallization of a substance can be determined using the equation ΔS = ΔH_fusion / T, where ΔH_fusion is the enthalpy of fusion and T is the temperature in Kelvin. In this case, the enthalpy of fusion of butane is given as 24.3 kJ/mol, which is converted to 24,300 J/mol. The melting point of butane is -0.5°C, which is equivalent to 272.65 K.

By substituting the values into the equation, we find that the change in entropy is approximately 89.25 J/(mol·K). This means that for the crystallization of 1.25 moles of butane, the entropy decreases by 89.25 J/(mol·K).

Entropy is a measure of the disorder or randomness of a system. In this case, the crystallization process involves the transition from a disordered liquid state to an ordered solid state, resulting in a decrease in entropy. The magnitude of the entropy change depends on the enthalpy of fusion and the temperature. A higher enthalpy of fusion or a lower temperature leads to a larger change in entropy.

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Answer:

Explanation:

molar mass of 13c = 13 grams

number of moles = mass / molar mass

therefore,

number of moles = 7 / 13

To know the number of atoms in 7/13 moles, we simply multiply the number of moles by Avogadro's number as follows:

number of atoms = (7/13) x 6.022 x 10^23 = 3.2426 x 10^23 atoms

Heterozygous dominant means that one inherited allele is dominant and one is recessive.

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Answer:

The waters' temp increased

Explanation:

The temperature of the water in the swimming pool has increased due to the heat from the Sun. As a result, the particles in the water are moving faster and have a higher kinetic energy than in the morning.

Explanation:

That the mass can neither be created nor destroyed in a chemical reaction.

Answer:

Strongly Basic

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Water molecules did not have a slight negative charge on one end and a slight positive charge on another, the loss of polarity would have profound effects on various biological, chemical, and physical processes. The unique properties of water that are vital for life as we know it would be significantly altered, potentially rendering many biological systems nonfunctional and disrupting the stability of ecosystems.

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Answer:

Any device that contains electronic parts

Answer:

Model B (in image) would the best representation of aluminum chloride.

Explanation:

It's the only model the has three chlorine atoms and one aluminum atom.

Additionally, Cl can only bond once, so it can't be bonded to multiple different atoms. Also, Al needs to have more than one bond to achieve the octet rule.

The Medal of Honor is the best navy decoration and highest volume.

The President of the USA The Victoria go is the holy grail for Medal of Honor creditors because there are the best in lifestyles. Bearing the inscription For valor and called a VC, this medal turned into first offered for conspicuous bravery' in 1856 and later backdated to the Crimean conflict of 1854. The outstanding service pass is the second maximum army ornament that may be provided to a member of the American military, for intense gallantry and risk of lifestyle in actual combat with an armed enemy force.

The Bronze Star Medal dates lower back to world battle II. these days, it is the fourth-maximum ranking award a provider member can obtain for a heroic and meritorious deed performed in an armed battle. For individuals who acquire the BSM, it's far a sign of their sacrifice, bravery, and honor at the same time as serving their us of a

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Answer:

An aerosol is a colloidal A. liquid suspended in a C. gas.

Explanation:

Hence an aerosol is a colloidal solid or liquid suspended in a gas Smoke or fog, for example.

Aerosol is a system of equally dispersed, finely divided liquid or solid particles passing through a gas, often air. Dust and other aerosol particles, which serve as the nuclei for condensation and freezing, are crucial to the precipitation process.

Secondary aerosols develop when gas is converted into a particle, whereas primary aerosols are made up of particles that are added directly to the gas. Key aerosol categories include sulfates, organic carbon, black carbon, nitrates, mineral dust, and sea salt. These substances typically clump together to create complicated mixtures.

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Answer:

C and B

Explanation:

1) In order for nitrogen to make a stable electronic configuration, it would have to gain three electrons.

Nitrogen is atomic number 7.  Hence, the electronic configuration would be:

           1s2, 2s2, 2p3

The p orbital is partially filled with 3 unpaired electrons. In order to be stable, the 3 electrons in the p orbital have to be paired. Hence, only by gaining 3 electrons can nitrogen obtain a stable electronic configuration.

2) The quantity the determines how two atoms would bond is the difference in the number of valence electrons in the atoms.

For example, an atom that is lacking 2 electrons will readily form a bond with another atom that has two free electrons.

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Solution :

Apply ideal gas equation, PV=nRT to find the number of moles.

The number of moles of a gas is

\($n=\frac{P_1V_1}{RT_1}$\)

\($n=\frac{(11.013 \times 10^5\ Pa)(1.50 \times 10^{-3}\ m^3)}{(8.134 \ J/Mole.K)(300 \ K)}$\)

n = 0.66 mole

The initial mass of the ethane in the flask is

m = 0.66 mole x 30.1 g/mole

   = 19.866 g

The volume and the number of moles remains constant after the stopcock is closed.

The final pressure of the ethane is

\($p_2=\frac{T_2}{T_1}p_1$\)

    \($=\frac{300}{550} \times 11.013 \times 10^5$\)

  = \($60.0709 \times 10^4 \ Pa$\)

Two moles or 36 g of water on decomposition gives 32 grams of oxygen gas. Then 494 g of water will give 439.1 g of oxygen.

The decomposition is a type of reaction in which a single compound breaks into its constituent elements or molecules. Water molecules are formed by the combination of hydrogen and oxygen atoms.

Decomposition of two moles of water  decompose to give 2 moles of hydrogen gas and one mole of oxygen gas.

molar mass of water = 18 g/mol

molecular mass of oxygen  = 32 g/mol

Two moles or 36 g of water gives one mole or 32 g of oxygen gas. Then mass of oxygen produced by 494 g of water is :

(494 ×32)/36 g = 439 g

Therefore, 439 g of oxygen gas is formed by the decomposition of 494 g of water.

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Answer:

Green design

Explanation:

The word ‘Green’ represents designs which are eco friendly and less harmful to humans and other organisms. It helps in the protection of natural resources such as water, air etc.

Green Design are also referred to as techniques and materials that reduce the negative environmental impact of a structure.

Answer:

b

Explanation: