Which of the following is the correct Lewis structure for ammonia (NH3)
respectively
H
H
1
H-N-H
N-H
* -N- H-N-H
H
H
H
А
B
С
D
E
A
figure A
B. figure B
C. figure
D. figure D
E. figure E

Answer:

ganda no beeeeeèeeeeee

Answer:

Water is also produced alongside salt

Besides salt, water is formed as the other product when an acid reacts with an alkali. The acid-alkali reaction is a type of neutralization reaction. When an acid reacts with an alkali, they both react to form salt and water.

Salts are ionic compounds that are composed of cations and anions held together by ionic bonds. Salts have positive and negative ions that are held together by ionic bonds. They have high melting and boiling points and are crystalline solids at room temperature.

Acids are substances that produce hydrogen ions, H+ when dissolved in water. They have a sour taste and turn blue litmus paper to red.

Alkalis are bases that dissolve in water to form hydroxide ions, OH-. They are usually soluble in water and can be identified by their bitter taste and ability to turn red litmus paper blue.

When acids and alkalis react, they undergo a neutralization reaction, which results in the formation of salt and water. In this reaction, hydrogen ions (H+) from the acid and hydroxide ions (OH-) from the alkali react with each other to form water (H₂O). The remaining ions from the acid and alkali combine to form a salt.

The reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH) is an example of an acid-alkali reaction.

HCl + NaOH → NaCl + H₂O

Acid + alkali → salt + water

Hence, water is the other product that is formed when an acid reacts with an alkali, apart from salt.

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Cellulose and Starch substances are composed of the same monomer units, just arranged differently.

Option D is correct.

A monomer is a little particle that responds with a comparative atom to frame a bigger atom. It is the littlest unit in a polymer, which is much of the time a macromolecule with high sub-atomic weight. DNA, RNA, proteins, and carbohydrates are all biological macromolecules made up of monomers.

Some cracks can be successfully repaired with monomer systems. A liquid composed of monomers that will polymerize into a solid is known as a monomer system. The flammability, toxicity, and volatility of suitable monomers vary. They are insoluble in water.

Incomplete question:

Which substances are composed of the same monomer units, just arranged differently?

a. saccharides; glycogen

b. glycogen; chitin

c. cellulose; chitin

d. cellulose; starch

e. starch; sugar

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If the change in Gibbs free energy for a process is positive, the corresponding change in entropy for the universe will be positive.

This is defined as the energy used by a substance involved in a chemical reaction.

The Gibbs free energy and entropy has a direct relationship which is why a positive gibbs free energy will result in a corresponding positive entropy.

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Answer: The correct answer is Negative

Answer:

I think is the last one!!!! punnet square ⬜

Answer:

D. It is supported by adequate data

Explanation:

A theory is a well-substantiated explanation

Hope this helps!

Have a great day. :)

Answer:

[H]

Explanation:

This is nascent hydrogen it's a reactive form of hydrogen...

It reduces elements and compounds.

Answer:

pure science is the study of nature and its environment while applied science is the acquisition of scientific knowledge from pure science to solve practical problems

Answer:

A pressure cooker works based on Bernoulli's Principle.

Explanation:

trust me u will get what I am saying

A pressure cooker is primarily based on the precept that with the growth in stress, the boiling factor of water increases. it really works by means of capturing the steam which will increase the pressure inside the vessel. due to a boom in pressure, the boiling point of water rises up.

Pressure cooking is the method of cooking meals beneath excessive stress steam, using water or a water-primarily based cooking liquid, in a sealed vessel known as a pressure cooker. Excessive pressure limits boiling, and creates higher cooking temperatures which cook meals far greater quickly.

A pressure cooker is based on the principle that boiling point of water will increase with the growth in pressure. It really works through shooting the steam that, as it builds up, will increase the strain within the vessel.

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Answer:

I DONT KNOW SORRY

Explanation:

Answer:

Iodine-131 is more likely to undergo beta decay than positron decay.

Answer:42 atoms at least

42

Explanation:

1234567912345678912345678912345678

The percent yield of H₂O, if 87.0 g of H₂O is produced by combining 95.0 g of O₂ and 11.0 g of H₂ is 87.87%.

Mass of any substance will be calculated by using their moles as:

n = W/M, where

W = given or required mass

M = molar mass

Moles of 95g of Oxygen (O₂) = 95g / 32g/mol = 2.96 moles

Moles of 11g of hydrogen (H₂) = 11g / 2g/mol = 5.5 moles

Given chemical reaction is:
2H₂ + O₂ → 2H₂O

From the stoichiometry of the reaction, it is clear that:

1 moles of O₂ = reacts with 2 moles of H₂

2.96 moles of O₂ = reacts with 2×2.96=5.92 moles of H₂

Here hydrogen is the limiting reagent as it has lower moles and formation of water depends on this only.

2 moles of H₂ = produces 2 moles of water

5.5 moles of H₂ = produces 5.5 moles of water

Mass of 5.5 moles of water will be calculated as:

W = (5.5mol)(18g/mol) = 99g

Given theoretical yield of water = 87g

% yield of water will be calculated as:
% yield = (87 / 99)×100 = 87.87%

Hence required value is 87.87%.

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Answer:

D

Explanation:

Answer:

3

Explanation:

Balancing the equation:

Original equation: Al + H2SO4 → AL2(SO4)3 + H2

We see that in aluminum in AL2(SO4)3 there is a subscript 2.

We put a 2 in the front of the reactant Al.

We also see a subscript 3 behind (SO4).

We add a 3 in front of H2SO4.

Now we have to balance the H2 on both sides. We add a 3 in front of the H2 on the right as there is 3 H2 molecules on the left.

2Al + 3H2SO4 → AL2(SO4)3 + 3H2

I hope it helps :)

The coefficient of hydrogen is 3

The numbers placed in front of formulas to balance equations are called coefficients, and they multiply all the atoms in a formula.

Balancing the equation:

Given, the equation: Al + H2SO4 → AL2(SO4)3 + H2

We see that in aluminum in AL2(SO4)3 there is a subscript 2.

We put a 2 in the front of the reactant Al.

We also see a subscript 3 behind (SO4).

We add a 3 in front of H2SO4.

Now we have to balance the H2 on both sides. We add a 3 in front of the H2 on the right as there are 3 H2 molecules on the left.

2Al + 3H2SO4 → AL2(SO4)3 + 3H2

A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products.

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Use the formal charge for each atom in each of the lewis structures given, to the one more likely shows the correct connectivity for NOF is

O = N - F.

formal charge for N = O - F

formal charge = valence electrons - non bonding electrons - (1/2) bonding

                                                                                                          electrons

formal charge for N = 5 - 4 - (1/2) 4

                                 = -1

formal charge for O = 6 - 2 - (1/2)6

                                 = +1

formal charge for F = 7- 6 - (1/2)2

                                = 0

formal charge for O = N - F

formal charge for N = 5 - 2 - (1/2)6

                                 = 0

formal charge for O = 6 - 4 - (1/2) 4

                                 = 0

formal charge for F = 7 -  6 - (1/2)2

                                 = 0

Thus, Use the formal charge for each atom in each of the lewis structures given, to the one more likely shows the correct connectivity for NOF is  O = N - F because in  this structure all atoms have zero formal charge.

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Answer:

Electrochemistry,

Explanation:

Electrochemistry is a branch of chemistry concerned with the relation between electricity and chemical change. Many spontaneously occurring chemical reactions liberate electrical energy, and some of these reactions are used in batteries and fuel cells to produce electric power.

I Hope This Helps!!!!!

Answer:

Electrochemistry, branch of chemistry concerned with the relation between electricity and chemical change. Many spontaneously occurring chemical reactions liberate electrical energy, and some of these reactions are used in batteries and fuel cells to produce electric power.

Claim: The separation of Mesosaurus fossils can be explained by the continental drift hypothesis. Evidence: Fossil Distribution, Geological Similarities, Matching Climate and Habitat. The distribution of Mesosaurus fossils across South America and Africa, the geological similarities between these regions, and the matching climate and habitat conditions all support the claim that the separation of Mesosaurus populations can be explained by the process of continental drift.

Claim: The separation of Mesosaurus fossils can be explained by the continental drift hypothesis.

Evidence:

Fossil Distribution: Mesosaurus fossils are found in both South America and Africa. This distribution aligns with the hypothesis of continental drift, which suggests that these continents were once connected and later separated. The similarity in fossil remains on different continents supports the claim that Mesosaurus populations were separated when the continents drifted apart.

Geological Similarities: The geological formations and sedimentary layers in which Mesosaurus fossils are found in South America and Africa display remarkable similarities. This similarity implies that these regions were once part of the same landmass and were subsequently separated. The matching geological features provide further evidence for the separation of Mesosaurus populations due to continental drift.

Matching Climate and Habitat: Mesosaurus fossils indicate that the species was adapted to a freshwater environment. The presence of similar freshwater environments in both South America and Africa further supports the claim that Mesosaurus populations were separated when the continents drifted apart. The matching climate and habitat conditions provide evidence that supports the idea of geographic isolation and subsequent speciation.

In conclusion, the distribution of Mesosaurus fossils across South America and Africa, the geological similarities between these regions, and the matching climate and habitat conditions all support the claim that the separation of Mesosaurus populations can be explained by the process of continental drift.

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River water stored behind a dam is best described as a form of Potential Energy.

What is Potential energy?

Potential energy is refered to as energy that is stored – or conserved - in an object or substance. This stored energy is based on the position, arrangement or state of the object or substance. There are two types of potential energy namely:

The water or river behind a dam stores gravitational potential energy since it is at a higher level than the water on the other side of the dam.

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Answer:

metals are located to the left of the black "staircase". nonmetals are located in the upper right, above the black staircase

Explanation:

Answer:

na

Explanation:

gggggggggggggggggggggggggg

Cl (chlorine) ion is negatively charged.

The half-life of the radioisotope, calculated based on the given information that after ten years only 75 grams remain from an initial 100 grams, is approximately 28.97 years.

To find the half-life of the radioisotope, we can use the formula for exponential decay:

N(t) = N₀ × (1/2)^(t / T₁/₂)

T₁/₂ is the half-life of the substance.

In this case, we know that the initial amount N₀ is 100 grams, and after ten years (t = 10), 75 grams remain (N(t) = 75 grams).

We can plug these values into the equation and solve for T₁/₂:

75 = 100 × (1/2)^(10 / T₁/₂)

Dividing both sides of the equation by 100:

0.75 = (1/2)^(10 / T₁/₂)

Taking the logarithm (base 2) of both sides to isolate the exponent:

log₂(0.75) = (10 / T₁/₂) × log₂(1/2)

Using the property log₂(a^b) = b × log₂(a):

log₂(0.75) = -10 / T₁/₂

Rearranging the equation:

T₁/₂ = -10 / log₂(0.75)

Using a calculator to evaluate the logarithm and perform the division:

T₁/₂ ≈ 29.13 years

Therefore, the half-life of the radioisotope is approximately 28.97 years.

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The mole ratio of acid to base when neutralizing hydrochloric acid with sodium hydroxide is 1:1. A mole of NaOH would completely neutralize one mole of HCl.

An acid and a base can be combined to neutralise a solution. Neutralization happens when the moles of the acid and the base are equal. Calculating the molar ratio of acid to base can be done using the balanced chemical reaction. The reaction coefficient is a representation of the molar ratio. The base's moles can then be determined using its molar mass and molecular weight.

However, the mole ratio would be 2:1 if chlorine dioxide and barium hydroxide were added. Use the atomic masses to translate each element's mass into moles. By dividing the total number of moles by the smallest number of moles, you may determine the ratio or the number of moles of each element.

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Answer:

-1300. kJ  

Explanation:

We have two equations:

1. P₄(s)       +3O₂(g) ⟶ P₄O₆(s);                 ΔH₁  = -1640.1 kJ

2. P₄O₁₀(s)               ⟶ P₄(s)      + 5O₂(g); ΔH₂ =  2940.1 kJ

From these, we must devise the target equation:

3. P₄O₆(s)  + 2O₂(g) ⟶ P₄O₁₀(s);               ΔH = ?

The target equation has P₄O₆(s) on the left, so you reverse Equation 1.

When you reverse an equation, you reverse the sign of its ΔH.

4. P₄O₆(s)                 ⟶ P₄(s)       +3O₂(g); ΔH₁  =  1640.1 kJ

Equation 4 has P₄ on the right. That is not in the target equation.

You need an equation with P₄ on the left, so you reverse Equation 2.  

5. P₄(s)      + 5O₂(g)  ⟶ P₄O₁₀(s);               ΔH₂ = -2940.1 kJ

Now, you add equations 4 and 5, cancelling species that appear on opposite sides of the reaction arrows.

When you add equations, you add their ΔH values.

You get the target equation 3:

4. P₄O₆(s)                      ⟶ P₄(s)        + 3O₂(g);      ΔH₁ =   1640.1 kJ

5. P₄(s)       + 2(5)O₂(g) ⟶ P₄O₁₀(s);                       ΔH₂ = -2940.1 kJ

3. P₄O₆(s)   + 2O₂(g)     ⟶ P₄O₁₀(s);                       ΔH   = -1300.  kJ

ΔH for the reaction is -1300. kJ

Answer:

Atoms are electrically neutral because they contain equal quantities of positively charged protons and negatively charged electrons. Electrons and protons have equal but opposite charges, so the result is no net charge. Ions are atoms that have gained or lost electrons.

We have the following formula for concentration:

M = n/V

where M is molarity (concentration), n is number of moles of the solute, or it can be the amount of the solute and V is the volume of the solution.

If you kept constant V and increases n, M will increase as well.

So the concentration will increase.

Answer: D.) it increases (becomes more concentrated)

The pH of the 0.2 M solution of the amine with a pKa of 9.5 is approximately 8.8.

To calculate the pH of a 0.2 M solution of an amine with a pKa of 9.5, we can use the Henderson-Hasselbalch equation:

pH = pKa + log ([A-]/[HA])

Given:

pKa = 9.5

[A-]/[HA] = 0.2 M

Substituting the values into the equation:

pH = 9.5 + log (0.2/1)

Since log (0.2/1) is equal to log (0.2), we can calculate the pH as follows:

pH = 9.5 + log (0.2)

Using logarithm properties, we can convert log (0.2) to its decimal equivalent:

log (0.2) ≈ -0.69897

Now we can calculate the pH:

pH ≈ 9.5 - 0.69897

pH ≈ 8.80103

Therefore, the pH of the 0.2 M solution of the amine with a pKa of 9.5 is approximately 8.8.

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Answer:

NaCI (salt) in water

Explanation:

After the salt compounds are pulled away apart the sodium chloride atoms are surrounded by water molecules. Once this happens we know that the salt is dissolved resulting in a homogeneous solution!

HOPE THIS HELPED!

Answer:

NaCI (salt) in water

Explanation:

took the quiz

When two amino acid monomers are positioned so that the carboxyl group of one is adjacent to the amino group of the other, they can be joined through a reaction.

It is True.

Amino acid molecules make up proteins. Proteins and amino acids are essential to life. After proteins have been digested or broken down, amino acids are still present. To maintain the body, the human body makes proteins from amino acids: Prepare food.

Taking a supplement containing essential amino acids is wonderful because you can do so anytime you choose. While some athletes prefer to take it with meals or a protein shake, others prefer to take it on an empty stomach in between meals.

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