What is a paragraph to fit this

Answer:

iv. -NH₂

Explanation:

The amine group is an activating substituent and provides an ortho-para orientation.

The free electrons in the nitrogen atom provide stabilization by resonance in the sigma complex if the attack by the electrophilic reactant occurs in the positions ortho or para with regards to the nitrogen atom.

Answer:

a: 1 amu

b: +1

c: neutron

d: 1 amu

Explanation:

Answer:

Polar molecule.

Explanation:

Hello,

In this case, hydrogen sulfate has in its structure sulfur-oxygen and oxygen-hydrogen bonds which are both polar since the electronegativity difference is between 0.7 and 1.7 (0.86 and 1.24 respectively), for that reason, such quality makes hydrogen sulfate a polar molecule, for that reason it is largely soluble in water.

Best regards.

Answer:

pH = 0.18

Explanation:

The sulfuric acid (H₂SO₄) has the following reactions in aqueous medium:

H₂SO₄ → HSO₄⁻ + H⁺

HSO₄⁻ ⇄ SO₄²⁻ + H⁺ Ka = 1.1x10⁻²

Where Ka is defined as Ka = [SO₄²⁻] [H⁺] / [HSO₄⁻] = 1.1x10⁻²

Based in the first reaction, [H⁺] = 0.65M and [HSO₄⁻] = 0.65M

In the second reaction, the two species are in equilibrium, thus, concentrations will be:

[H⁺] = 0.65M + X

[HSO₄⁻] = 0.65M - X

[SO₄²⁻] = X

Replacing in Ka formula:

1.1x10⁻² = [X] [0.65 + X] / [0.65M - X]

7.15x10⁻³ - 1.1x10⁻²X = 0.65X + X²

0 = X² + 0.661X - 7.15x10⁻³

Solving for X:

X = -0.67M → False solution. There is no negative concentrations.

X = 0.01065M → Right answer.

Thus [H⁺] = 0.65M + 0.01065M = 0.66065M

As pH = -log [H⁺];

pH = -log 0.66065M = 0.18

Answer:

4.35 mL

Explanation:

The water line falls halfway inbetween the 4.4 and 4.3 mark.

The number halfway between 4.3 and 4.4 is 4.35.

Therefore, the volume of the liquid in the graduated cylinder is 4.35 mL.

Answer:

A small amount of solute dissolved in a larger amount of solvent.

Take this analogy to help you understand, if you were to put a teaspoon of sugar in a liter of water it would dissolve, but if you put a sack of sugar in it it would not dissolve! The solute is what is being dissolved and the solvent is what dissolves the solute, so that eliminates some of the options.

Answer:

3.Medical Scientists

5.Biochemists and Biophysicists

Explanation:

Science and Math jobs are expected to have much faster than average growth. Medical Scientists and Biochemists and Biophysicists is correct.

Scientists with biochemistry training are known as biochemists. They research the chemistry of living things, including chemical reactions and changes. Biochemists research DNA, proteins, and cellular components. A portmanteau of "biological chemist" is the term "biochemist."

The study of biochemistry focuses on the chemistry of living things. It is a lab-based science that combines chemistry and biology.

Biochemists investigate the makeup, chemistry, and chemical processes of the compounds found in living things in order to understand how they work and how to manipulate them.

Thus, option 3 and 5 both are correct.

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Answer:

D

Explanation:

H2O + H20 = H30+ + OH-

Answer:

See explaination

Explanation:

No, the neurons don't use diffusion to transfer messages rather they employ the use of electrical impulses which are very fast for example, if we drop something accidentally on our foot we immediately move back to prevent ourselves from injury this quick reaction is possible because the signals are transferred in the form of electrical impulses.If diffusion was there to transfer the message then it would have taken very long time and our foot would have been bleeding too as diffusion process is relatively much slower.

This is due to collision of CO2 molecule with other molecules of CO2 and vander vals interaction between them which results in slow down of CO2 molecule and the CO2 molecules also collide with walls of leaf as well which also decreases the speed of CO2 molecule resulting it in taking more time.

Answer:

I'm glad you asked!

Explanation:

Gravity is a force which keeps people from floating around.

Density is usually used for mass or volume.

Weight is how heavy something is.

Acceleration is when something increases in height,speed etc.

The answer is Density.

Enthalpy is the heat involved in a reaction.

The enthalpy change is the sum of the internal energy and the product of volume and pressure. Enthalpy is the heat involved in a reaction. The correct option is A.

The enthalpy denotes the measurement of energy in a thermodynamic system. The amount of enthalpy equals to the total heat content of a system, equivalent to the system's internal energy plus the product of volume and pressure.

The enthalpy is described as a state function, which indicates that its value depends only on the state of the system and it is independent of the path by which this state has been reached.

The equation of the enthalpy of system is given as:

H = U + PV

Here the enthalpy is represented by the letter 'H'. It is a very important quantity as it gives how much heat or energy is present in the system.

Thus the correct option is A.

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Answer:

a) 0.210 j /k

b) 0.032 j/k

Explanation:

Find the attachment for solution

Answer:

global warming and destruction of the ozone layer

Explanation:

if Carbon dioxide are high in number , it will cause destruction of the ozone layer which will result to global warming

Answer:

Explanation:

Fe₂O₃(s) + 3H₂(g)  =  2Fe (s) + 3H₂O - 98.8 kJ .

one mole of ferric oxide reacts with 3 mole of hydrogen to give 2 mole of iron and 3 mole of water .   98.8 kJ of heat is absorbed .

Answer:

Option A) Sixty-five percent of Egyptians do not use the internet at all.

Explanation:

Did it on edg

Answer:

A. 65% of Egyptians do not use the internet at all

Explanation:

Brainliest Answer Please!

Answer:

Answer if yourself Kempner student.

Explanation:

xD

Answer: Solar energy

Explanation:

Solar energy because it has more clear and sunny skys

Hello there!

An alternative energy source that is best for Coalville is wind energy.

The first two options, solar power and hydroelectric power aren't very good options since solar power requires lots of sun and they only receive 70 days of sun. While, hydroelectric power isn't a good choice either since it is a small stream meaning very little water and not big enough to build a dam on.

Therefore, wind energy is the best idea since high wind speeds are good to spin the wind turbines. The faster the wind the more energy is produced. Coalville has an average windspeed of 20 mph which is quite fast so that will the best option.

Answer:

d. HNNH has both the strongest nitrogen-nitrogen bond and the shorter nitrogen-nitrogen bond.

Explanation:

The Lewis structure of HNNH comprises of a double bound between the two nitrogen atoms, therefore each nitrogen still carrying a lone pair of electron and  a single bond between each nitrogen to it respective hydrogen.

Also for H_2NNH_2; there exists a single nitrogen to nitrogen bond because hydrogen is sharing two bonds already with the nitrogen; the nitrogen also possess a lone pair of electron and the last bond is a single bond between the nitrogen to nitrogen atom ( therefore obeying the octet rule).

The bond strength and bond angle is stronger and shorter in double bonds than single bonds, thus HNNH has both the strongest nitrogen-nitrogen bond and the shorter nitrogen-nitrogen bond.

Answer:

d. HNNH has both the strongest nitrogen-nitrogen bond and the shorter nitrogen-nitrogen bond.

Explanation:

The Lewis structure of HNNH comprises of a double bound between the two nitrogen atoms, therefore each nitrogen still carrying a lone pair of electron and  a single bond between each nitrogen to it respective hydrogen.

Also for H_2NNH_2; there exists a single nitrogen to nitrogen bond because hydrogen is sharing two bonds already with the nitrogen; the nitrogen also possess a lone pair of electron and the last bond is a single bond between the nitrogen to nitrogen atom ( therefore obeying the octet rule).

The bond strength and bond angle is stronger and shorter in double bonds than single bonds, thus HNNH has both the strongest nitrogen-nitrogen bond and the shorter nitrogen-nitrogen bond.

Answer:

This involves metric conversion and one can easily use dimensional analysis, assuming you know the conversion factors.  

1 ng = 10-9 g, or put another way 109 ng = 1 g

1 kg = 103 g

5.27x10-13 kg x 1 g/1x10-3 kg x 1x109 ng/g = 5.27x10-1 ng = 0.527 ng

Looking at the individual steps and following the units, we have...

5.27x10-13 kg x 1 g/1x10-3 g = 5.27x10-10 g (kg cancel leaving g)

5.27x10-10 g x 1x109 ng/g = 5.27x10-1 ng = 0.527 ng (g cancel leaving ng)

Answer:

Check the explanation

Explanation:

Kindly check the attached image below to see the step by step explanation to the question above.

Answer:

Deoxyribose Nucleic Acid

Answer:

The Full form of DNA is Deoxyribonucleic acid. Deoxy means lack of an oxygen atom, Ribo means ribose sugar, Nucleic is found in the nucleus of cell and Acid contains negatively charged phosphate ion which is acidic.

Answer:

2

Explanation:

Heat of reaction is usually the difference of heat of products and heat of reactions. The difference here is represented by the letter 2.

The potential energy diagram has been representing the heat of reaction at interval 2.

The heat of reaction has been defined as the difference in the heat of product and reactant. The potential energy has been the stored energy of the compounds.

In the given potential energy curve, the heat of reaction has been found to be the increase in potential energy. There has been an increment in the energy at interval 2.

Thus, the potential energy diagram has been representing the heat of reaction at interval 2.

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Answer:

It is an example of double displacement reaction.

4.8 g of NaCl is needed to react.

Explanation:

Balanced reaction: [tex]H_{2}SO_{4}(aq.)+2NaCl(s)\rightarrow 2HCl(g)+Na_{2}SO_{4}(aq.)[/tex]

Here, oxidation states of H, S, O, Na and Cl do not change during reaction. Hence it is not a redox reaction.

In this reaction, cations and anions of the reactants interchange their partners during reaction. Hence, it is an example of double displacement reaction.

As [tex]H_{2}SO_{4}(aq.)[/tex] remain in excess amount therefore NaCl (s) is the limiting reagent. Hence production of HCl entirely depends on amount of NaCl used.

Molar mass of HCl = 36.46 g/mol

So, 3.0 g of HCl = [tex]\frac{3.0}{36.46}[/tex] mol of HCl = 0.082 mol of HCl

According to balanced equation-

2 moles of HCl are produced from 2 moles of NaCl

So, 0.082 moles of HCl are produced from 0.082 moles of NaCl

Molar mass of NaCl = 58.44 g/mol

So, mass of 0.082 moles of NaCl = [tex](0.082\times 58.44)[/tex] g = 4.8 g

Hence 4.8 g of NaCl is needed to react.

Answer:

11

Explanation:

pH=-log(H+)

Answer:

it makes it go faster

Explanation:

Answer:

The solid phase has the lowest entropy.

Explanation:

Entropy (S) is the measure of how  spread out or dispersed the energy of a system is among the different possible ways  that system can contain energy. The greater the dispersal, the greater is the entropy.

In a solid, the atoms or molecules  are confined to fixed positions, thus, the dispersal is minimal and the entropy is at its lowest.

Answer: Both biotic and abiotic limiting factors can limit organisms' ability to live or reproduce.

Explanation:

penn foster

Answer:

172 g

Explanation:

Let's consider the reduction of Au³⁺ to Au.

Au³⁺(aq) + 3 e⁻ → Au(s)

In order to find the mass of gold produced, we will use the following relations.

The mass of gold produced when 15.1 A of current are passed through a gold solution for 31.0 min is:

[tex]31.0min \times \frac{60s}{1min} \times \frac{15.1C}{s} \times \frac{1mole^{-} }{96,468C} \times \frac{3molAu}{1mole^{-} } \times \frac{196.97gAu}{1molAu} = 172 gAu[/tex]

Answer:

15.63.

Explanation:

So, from the question, we are given the following parameters or data or information for solving this particular Question and they are;

(1). "semi-permeable membrane from the extracellular space ([galactose] = 2 mM) to the cytosol ([galactose] = 10 mM) under biochemically standard conditions. (R = 0.08206 L atm/mol K = 8.314 J/mol  K) (15 pts.) "

(2). "If ATP hydrolysis liberates 30.5 kJ/mol at standard conditions".

(3). " (507.2 g/mol) would be required to transport 260 g of galactose from the extracellular space to the cytosol"

Step one: determine the difference to transport of galactose from extracellular space to cytosol.

This can be done by using the formula below:

Ratio = intracellular/ extracellular.

=> 10/2 = 5 mM.

Step two: so, from statement (2) and (3), the if 507.2 g/mol ATP = 30.5 kJ/mol, then 260 g/mol = ???

Therefore, 260 × 30.5 / 507.2 = 15.63 is the energy required.