Chlorobenzene, C₆H₅Cl, is a key intermediate in the manufacture of dyes and pesticides. It is made by the chlorination of benzene, catalyzed by FeCl₃, in this series of steps:(b) Identify the Lewis acids and bases in each of those steps.

Answer:

The overall redox reaction is balanced when the number of electrons lost by the reductant equals the number of electrons gained by the oxidant. An electric current is produced from the flow of electrons from the reductant to the oxidant.

Explanation:

N/A

The volume of the stock solution is 6.25 mL.

Stock solutions are manufactured by the technician or pharmacist and have a known concentration for ease of dispensing.

A closed surface-enclosed three-dimensional space's volume is measured physically.

12 molar of HCl is required to make 500 ml of 0.15 liters.

The number of moles n of HCl can be calculated as:

c = n / V

n = c × V

n = 0.15 M × 500 ml

n = 0.15 M × 500 × 10⁻³

n = 0.075 moles HCl

Now, the volume of the stock can be calculated using the number of moles of hydrochloric acid.

c = n / V

V = n / c

V(stock) = 0.075 moles / 12 M

V(stock) = 0.075 moles / (12 moles/ L )

V(stock) = 0.00625 L

V(stock) = 0.00625 × 10³ mL

V(stock) = 6.25 mL

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Answer:

-100 m/s²

Explanation:

Given data:

Mass of ball = 0.15 Kg

Force = 15 N

Acceleration of ball = ?

Solution:

Formula:

F = m × a

a = F/m

a = 15 N/0.15 kg

N = kg m/s²

a = 15 kg m/s²/ 0.15 Kg

a = -100 m/s²

Acceleration is negative because ball is slowing down.

Using the ideal gas law, we can determine the pressure of carbon dioxide in the metal cartridge.

By assuming the volume of the tire remains constant, we can calculate the gauge pressure that the carbon dioxide can provide to inflate the tire.

We can use 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.

First, we need to convert the given temperature of 299 K to Kelvin. Then, we can determine the number of moles of carbon dioxide in the cartridge by dividing the mass of carbon dioxide (16.0 g) by its molar mass.

Next, we substitute the values into the ideal gas law equation to solve for the pressure (P) of the carbon dioxide in the cartridge.

To find the gauge pressure, we need to subtract the atmospheric pressure (14.7 psi) from the total pressure calculated using the ideal gas law.

Finally, we assume the volume of the tire remains constant, and we can calculate the gauge pressure by dividing the pressure in the cartridge by the volume of the tire (3.81 L).

The resulting value will indicate the pressure to which the carbon dioxide in the cartridge can inflate the mountain bike tire.

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Answer: Mutations can cause instant adaptations, while natural selection is the process by which adaptations occurs over a series of generations. Adaptations are changes or processes of changes by which an organism or species becomes better suited for its environment. A mutation is an alteration of the DNA sequence.

Answer: I dont want to make you wrong but I think its D.

Answer:

Noble gas

Explanation:

Noble gases are the most stable elements on the periodic table, so every element aims to bond in a way that will make them have the same number of valence electrons as the noble gases. Valence electrons are the electrons in the outer ring of an element. Noble gases have eight valence electrons, which is the most possible. All elements aim to be unreactive in this manner. Hope this helps!

Answer:

(iii):

Reaction 1: Addition

[ We added chlorine to 2-propene ]

Reaction 2: Substitution

[ We substituted hydroxyl ion with chloride ion ]

Reaction 3: Oxidation

[ Acidified permanganate solution is a strong oxidizing agent. So we oxidized propanol to propanoic acid ]

Reaction 4: Acid - base

[ A base (Sodium hydroxide) is added to an acid (propanoic acid) to form a neutral salt ( Sodium propanoate ) ]

Answer:

The reaction will slow down because it is below the optimal temperature.

Explanation:

Enzymes catalyses a reaction and thus increases its rate. The rate of enzyme action is dependant on temperature by Arrhenius equation.  If the temperature reduces 10 degree celsius, then the rate enzyme action rate will also decreases accordingly.

An enzyme is a biological catalyst. They increases the rate of chemical reactions by attaining equilibrium fastly. This is achieved by decreasing the activation energies of the reactants.

There are various kinds of enzymes which are specific in their function and specific  to some substrates.  The temperature at which an enzyme shows its maximum activity is called optimum temperature.

The Arrhenius equation showing the relation between rate of reaction and temperature is:

\(K = Ae^{- \frac{E_{a}}{RT} }\)

Hence, as the temperature increases rate  also increase. The enzyme activity also. Therefore if the temperature reduces the enzyme activity reduces.

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The valence electrons of oxygen are; 2s2 2p4

The valence electrons of nitrogen are 2s2 2p3

This is how we can be able to know the number of valence electrons.

Valence electrons are the electrons in the outermost shell of an atom. They are the electrons involved in chemical reactions and bonding with other atoms. In the case of nitrogen, its electron configuration is 1s^2 2s^2 2p^3, which means it has two electrons in the first shell, two electrons in the second shell, and three electrons in the outermost p orbital, giving it a total of 5 valence electrons.

Oxygen has an electron configuration of 1s^2 2s^2 2p^4, which means it has two electrons in the first shell, two electrons in the second shell, and four electrons in the outermost p orbital, giving it a total of 6 valence electrons.

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Answer:

0.78L

Explanation:

According to Charles law, the equation below can be used to calculate the the new volume of the balloon

V1/T1 = V2/T2 .........eqn(1)

Where T1= initial temperature= 29.4°C

T,2= final temperature= 33.7°C

V2= final volume= ?

V1= initial volume= 0.68L

Making V2 the subject of formula from eqn(1)

V2=( T2 × V1)/T1

= (33.7 × 0.68)/29.4

=0.78L

Hence, the new volume of the balloon is 0.78L

Answer:

Potassium Hydroxide Solution =

or

Potassium Hydroxide =

Since we know the products and one of the reactions, we can work backward to discover what the other reactant may be.

As it is in the question, we can map the reactants and product:

Reactants                   Product

Ammonium                 Ammonia

Sulfate                         Sulfate

________                   Potassium

________                    Water

Since the reaction will yield Potassium and water, the likely reactant is Potassium Hydroxide (KOH). This is because we know that Ammonium lost a Hydrogen atom that could combine with the Hydroxide radical to form water.

This becomes clear when we consider the net ionic equation:

Ammonium sulphate + Potassium Hydroxide → potassium sulfate + ammonia + water

if we write this a balanced chemical equation:

(NH₄)₂SO₄   +  2KOH  →  K₂SO₄ + 2NH₃ + 2H₂O

if we write the reaction as an ionic equation

2NH₄⁺ + SO₄⁻ + 2K⁺ + 2OH⁻ → 2K⁺ + SO₄⁻ + 2NH₃ + 2H₂O

if we remove the ions that appear on both the reactant and product side (spectator ions)

Answer:

compound

Explanation:

because it is made up of pure substance consists of atom

Answer:

Organ

Explanation:

I got it right when I took the test.

1. The approximate percent of water in the hydrate is 16%

2. The value of x in the hydrate is 2

Mass of hydrate, SnCl₂•xH₂O = 0.366 g

Mass of water, H₂O = 0.0586 g

Percentage of water =?

Percentage = (mass of water / mass of hydrate) ×100

Percentage of water = (0.0586 / 0.366) × 100

Percentage of water = 16%

To obtain the value of x, we shall determine the formula of the hydrate. This can be obtained as follow:

Divide by their molar mass

SnCl₂ = 0.3074 / 190 = 0.0016

H₂O = 0.0586 / 18 = 0.0032

Divide by the smallest

SnCl₂ = 0.0016 / 0.0016 = 1

H₂O = 0.0032 / 0.0016 = 2

Thus, the formula of the hydrate is SnCl₂•2H₂O

Comparing the formula of the hydrate (SnCl₂•2H₂O) with SnCl₂•xH₂O, we can see that the value of x is 2

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Many metal compounds are colored and paramagnetic, whereas main-group ionic compounds are colorless and diamagnetic.

This is because the electronic configurations and bonding in metal compounds are different from those in main-group ionic compounds.

In metal compounds, the metal atoms have partially filled d or f orbitals that are involved in bonding with other atoms. These orbitals can interact with light to absorb certain wavelengths, resulting in the compound having a characteristic color.

Additionally, the unpaired electrons in these partially filled orbitals can lead to the compound being paramagnetic, meaning it is attracted to a magnetic field.In contrast, main-group ionic compounds typically have fully filled s and p orbitals in their outermost shells, and the bonding involves the transfer of electrons from the metal to the nonmetal.

This results in a compound that is electrically neutral and does not have unpaired electrons, so it is diamagnetic and colorless.

Overall, the electronic configurations and bonding in metal compounds make them more likely to be colored and paramagnetic, while main-group ionic compounds are more likely to be colorless and diamagnetic.

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Precipitates are insoluble ionic solid products of a reaction, formed when certain cations and anions combine in an aqueous solution. The determining factors of the formation of a precipitate can vary.

The amount in moles of the excess reactant left is 0.5 mole

2ZnS (s) + 3O₂(g) --> 2ZnO (s) + 2SO₂(g)

From the balanced equation,

2 moles of ZnS reacted with 3 moles of O₂

From the balanced equation,

2 moles of ZnS reacted with 3 moles of O₂

Therefore,

4.2 moles of ZnS will react with =(4.2 × 3) / 2 = 6.3 moles of O₂

From the calculations made above, we can see that only 6.3 moles of O₂ out of 6.8 moles given, is required to react completely with 4.2 moles of ZnS.

Thus, ZnS is the limiting reactant and O₂ is the excess reactant.

The excess reactant is O₂. Thus the mole remaining after the reaction can be obtained as illustrated below:

Mole of O₂ remaining = (Mole of O₂ given) - (Mole of O₂ that reacted)

Mole of O₂ remaining = 6.8 - 6.3

Mole of O₂ remaining = 0.5 mole

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If H₀ is U₁-U₂=0 and the confidence interval is 3.798 to 12.202 and 0 is concluded as accepted in the confidence interval, then it is the same as saying that we are 95% confident that the true difference between the two population means (U1 and U2) lies between 3.798 and 12.202.

The null hypothesis states that the difference between the population means is zero, and the confidence interval contains zero, we cannot reject the null hypothesis. This means that we do not have enough evidence to conclude that there is a significant difference between the two populations. Therefore, we accept the null hypothesis and conclude that there is no difference between the population means.

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The answer to the question is that it will take approximately 300 days for the activity of the radium sample to decrease to 1.0 mci.


To solve the problem, we can use the formula for radioactive decay:

A = A0 (1/2)ⁿ  (n=t/T)

where A is the activity of the radium sample at any given time, A0 is the initial activity, t is the time elapsed, and T is the half-life.

We are given that the initial activity, A0, is 32.0 mci and the half-life, T, is 75 days. We are asked to find the time, t, it takes for the activity to decrease to 1.0 mci.

Plugging in the values, we get:

1.0 = 32.0 (1/2)ⁿ  (n=t/75)

Simplifying, we can divide both sides by 32.0 to get:

(1/32.0) = (1/2)ⁿ (n=t/75)

Taking the natural logarithm of both sides, we get:

ln(1/32.0) = (t/75) ln(1/2)

Solving for t, we get:

t = (75 ln(1/32.0)) / ln(1/2)

Using a calculator, we get:

t ≈ 300 days

Therefore, it will take approximately 300 days for the activity of the radium sample to decrease to 1.0 mci.

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Answer:

New growth of trees is an exception

Explanation:

when volcanoes erupt, they release hot magma that is destructive to the environment causing personal damage, lack of breathable air and death.

heat produce cannot in any way help in growth of trees

The coefficient for sodium in the balanced equation would be 1.

When balancing a chemical equation, you want to make sure that the number of atoms of each element is the same on both sides of the equation. To do this, you can follow these steps:

          Na + Cl2 -> NaCl

     On the left side, there is 1 Na and 2 Cl.

      On the right side, there is 1 Na and 1 Cl.

        Na + Cl2 -> 2 NaCl

Thus, the coefficient of sodium is 1.

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Answer: They use their feathers

Explanation: They fluff their feathers for warmth I think so at least

Because I'm sure they stay in the forest and don't really hibernate

Answer:

They fluff there feathers for warmth

Explanation:

I did the test and got 100

Answer:

This is and ADDITION REACTION

Explanation:

Because your putting a compound and an element together

Answer:

This is an addition reaction.

The products are more stable than the reactants.

Explanation:

endpointVinegar is also called as acetic acid, and we can write it in the following way CH3COOH. When we talk about titration, it refers to the amount of base needed to neutralize the acid. So there is a chemical reaction involved. The reaction between vinegar and NaOH base is as follows:

We have a 1 to 1 ratio, i.e. to neutralize x moles of vinegar we need the same moles of NaOH. Let's calculate how many moles of acid are believed to be in the solution. We will use the molarity = 0.78M = 0.78 mol/L.

Then we need 0.016 moles of NaOH, the volume required will be:

So, the volume that would be needed of NaOH to see an end point is 17.23 mL

Answer:

Reflection

Explanation:

Answer:

b

Explanation:

The tectonic plates move due to the process of convection currents in the mantle, which is a slow and continuous movement of hot and molten magma. Option A is correct.

The magma rises up and cools at the surface, causing it to become denser and sink back down into the mantle, forming a cycle. As the magma rises and sinks, it drags the tectonic plates along with it, similar to a conveyor belt.

The movement of the plates is also influenced by their density, where the less dense plates tend to float on top of the denser plates, causing them to move in different directions. This movement of the tectonic plates leads to geological activities such as earthquakes, volcanic eruptions, and the formation of mountain ranges. Option A is correct.

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Answer: It can't.

Explanation:

In most cases, the melting point alone will not enable you to identify a compound. Millions of solid organic compounds, and their melting points, are known. Perhaps 10,000 of these will have the same melting point as your unknown compound.

Hope this helps!

To prepare 297.0g of chromium we need 154.21g of aluminum.

The preparation of chromium using aluminum powder is an exothermic process. It is the reaction where heat is released during the formation of product.

  Therefore, the chemical reaction for the formation of chromium is:

Cr2O3(s) + 2Al(s) -> 2CrO(s) + Al2O3(s)

Here, we can see that 2 moles of aluminum produces 2 moles of chromium.

Hence,

Molar mass of aluminum = 27g

as 2 moles of aluminum is required then 2 x 27 = 54g.

Molar mass of chromium = 54g

As, 2 moles of chromium is obtained then 2 x 54 = 104g.

Therefore, by cross multiplying we get the amount of aluminum required,

mass of aluminum produced = 54 x 297.9/ 104

                                                = 16038/104 = 154,21g.

Therefore, the required amount of aluminum is 154.21g

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