help me out pls (image attached)​

Considering the Lewis structure for the nitric acid molecule, HNO3, the false statement is option b), which states that the nitrogen atom has a formal charge of +1.

The Lewis structure for nitric acid, HNO3, consists of a central nitrogen atom bonded to three oxygen atoms and a hydrogen atom. Each of the oxygen atoms is single-bonded to the nitrogen atom and has a lone pair of electrons. The hydrogen atom is also bonded to one of the oxygen atoms.
Now, let's consider the given statements. Option a) states that the nitrogen atom is sp2 hybridized, which is true. The nitrogen atom in HNO3 is sp2 hybridized, as it forms three sigma bonds with three oxygen atoms and has one lone pair of electrons.

Option b) states that the nitrogen atom has a formal charge of +1, which is false. The nitrogen atom in HNO3 has a formal charge of 0, as it has five valence electrons and is surrounded by four electrons in the form of three bonds and one lone pair of electrons.

Option c) states that the nitric acid molecule has a net dipole moment, which is true. The molecule is polar due to the electronegativity difference between the nitrogen and oxygen atoms, resulting in a net dipole moment.

Finally, option d) states that the nitrogen atom has a lone pair of electrons, which is true. The nitrogen atom in HNO3 has one lone pair of electrons, which occupies the sp2 hybridized orbital perpendicular to the plane of the molecule.

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Answer:

B: a changing in color of a substance

Explanation:

The answer is B because whatever substance you get it would have a reaction of color

The formalin and methanal are not synonymous with formaldehyde.

So, from this, we can conclude that formalin and methanal are not synonymous with formaldehyde.

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Since the question is incomplete the complete question is as follows:

Formalin and methanal are both synonymous with formaldehyde. True or false?

Formalin as well as methanal are the chemical terms that are used for formaldehyde. Thus, the given statement is true.

Hence, the given statement is true formalin and methanal are called as formaldehyde.

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In modern proteomic analysis, the amino acid sequence of a protein can be determined by methods such as mass spectrometry and Edman degradation.

Proteomics is the large-scale study of proteins, particularly their structures and functions. Determining the amino acid sequence of a protein is a fundamental aspect of proteomics, as it provides important information about the structure and function of the protein. Modern proteomic analysis has several methods for determining the amino acid sequence of a protein.

One such method is mass spectrometry, which involves the ionization and fragmentation of the protein into smaller peptide fragments, and the measurement of the mass-to-charge ratios of these fragments. By analyzing the mass-to-charge ratios of these fragments, the amino acid sequence of the original protein can be reconstructed.

Another method is Edman degradation, which involves the sequential removal of amino acids from the N-terminus of the protein and their identification through chemical reactions. These methods are both widely used in modern proteomic analysis and have greatly advanced our understanding of the structure and function of proteins.

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Answer: You would place the apple on the person's head.

Explanation:

Answer:

The balanced chemical equation for the reaction of Na with H₂O is:

2Na + 2H₂O → 2NaOH + H₂

According to the given data, 4.00 x 10^2 mL of H₂ gas is produced at STP. We can use the ideal gas law to determine the number of moles of H₂ gas produced: 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.

At STP, P = 1 atm and T = 273 K, so:

V = nRT/P = (1 mol)(0.0821 L atm/mol K)(273 K)/(1 atm) = 22.4 L

Therefore, 4.00 x 10^2 mL of H₂ gas is equal to 0.4 L.

We can use the stoichiometry of the balanced chemical equation to relate the moles of H₂ gas produced to the moles of Na required:

2 mol Na : 1 mol H₂

x mol Na : 0.5 mol H₂

x = 0.25 mol Na

The molar mass of Na is 22.99 g/mol, so:

0.25 mol Na x 22.99 g/mol = 5.75 g Na

Therefore, 5.75 grams of Na are needed to liberate 4.00 x 10^2 mL of H₂ gas at STP

An example of a colloid formed from a gas dispersed in a liquid is foam. Foam is created when gas, usually air, is dispersed and trapped within a liquid. It forms a mixture of gas bubbles suspended in the liquid phase. Common examples of foams include whipped cream, soap bubbles, and beer foam.

Foams are characterized by their ability to retain gas bubbles within the liquid, creating a stable and distinct structure. The liquid component of the foam, called the continuous phase, surrounds and stabilizes the gas bubbles, preventing them from coalescing or collapsing. This stability is often due to the presence of surfactants, which lower the surface tension of the liquid and create a barrier between the gas and liquid phases.

The gas bubbles in foams can vary in size and distribution, leading to different properties and applications. Foams are widely used in various industries, including food and beverage, cosmetics, firefighting, and insulation. They can provide texture, stability, and other desirable characteristics in products and processes.

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Answer:

 Locations at a higher altitude have colder temperatures

Explanation:

brainliest please

Answer:

There are 0.24952533574875027 moles for 28.65 grams.

Explanation:

1 gram = 0.0087094358027487 mole

Answer: 86.14%, 100.86%

Explanation:

The relative atomic mass of an element is the average mass of the isotopes of the element, taking into account the abundance of each isotope. To determine the percentage abundance of each isotope, we can use the following formula:

Percentage abundance = (isotope mass / relative atomic mass) x 100

For the isotope with mass number 6, the percentage abundance would be:

(6 / 6.94) x 100 = 86.14%

For the isotope with mass number 7, the percentage abundance would be:

(7 / 6.94) x 100 = 100.86%

So the isotope with mass number 6 has an 86.14% abundance, and the isotope with mass number 7 has a 100.86% abundance. The sum of these two percentages is slightly greater than 100 because the relative atomic mass is an average and does not take into account the abundance of each isotope.

Answer:

0.067 ton/Litre.

Explanation:

645 Newtons per quart to tons per liter.

We'll begin by converting 645 Newton/quart to gram/quart (g/q). This can be obtained as:

1 N/q = 100 g/q

Therefore,

645 N/q = 645 N/q × 100 g/q / 1 N/q

645 N/q = 64500 g/q

Therefore, 645 Newton/quart is equivalent to 64500 grams per quart.

Next, we shall convert 64500 grams per quart to pounds per quart. This can be obtained as follow:

454 g/q = 1 pound/q

Therefore,

64500 g/q = 64500 g/q × 1 p/q / 454 g/p

64500 gram/quart = 142.07 pound/quart

Therefore, 64500 gram/quart is equivalent to 142.07 pound/quart.

Next, we shall convert 142.07 pound/quart to ton/quart. This can be obtained as follow:

2000 p/q = 1 ton/q

Therefore,

142.07 p/q = 142.07 pq × 1 ton/q / 2000 p/q

142.07 pound/quart = 0.071 ton/quart

Therefore, 142.07 pound/quart is equivalent to 0.071 ton/quart.

Finally, we shall convert 0.071 ton/quart to ton/litre. This can be obtained as follow:

1 ton/q = 1/1.06 ton/L

Therefore,

0.071 ton/q = 0.071 ton/q × 1/1.06 ton/L / 1 ton/q

0.071 ton/quart = 0.067 ton/Litre

Therefore, 0.071 ton/quart is 0.067 ton/Litre.

From the above illustration, 645 Newton/quart is equivalent to 0.067 ton/Litre.

Suppose a vessel contains HI at a concentration of 0.32 M. The concentration of HI in the vessel 0.88 seconds later is 0.175 M.

Initial concentration of HI = 0.32 M

Time = 0.88 s

Rate is given as 0.684 s⁻¹

The concentration of HI in the vessel 0.88 seconds later. It can be expressed as :

ln (HI) = ln (HI)₀ - (kt)

Where;

(HI)₀ is the initial concentration

k is the reaction rate constant

t is time

Now, we have;

ln (HI) = In (0.32) - (0.684 × 0.88)

ln (HI) = -1.1394 - 0.6019

ln (HI) = -1.7413

(HI) = e^(-1.7413)

(HI) = 0.175 M

Thus, the concentration of HI is 0.175 M.

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This question is incomplete the complete question is :

Consider this reaction: 2 HI(g) ⇄ H₂(g) + I₂(g)

At a certain temperature, this reaction follows first - order kinetics with a rate constant of 0.684 s^(-1). Suppose a vessel contains HI at a concentration of 0.32 M. Calculate the concentration of HI in the vessel 0.88 seconds later. you may assume no other reaction is important. round your answer to significant digits.

ClO3-: The chlorine atom carries a single negative charge.

ClO4-: The chlorine atom carries a single negative charge.

NO3-:The nitrogen atom does not carry any charge, and the molecule as a whole carries a single negative charge.

Certainly! Here are the drawings of the molecules you requested:

1. ClO3-

   O

    |

Cl - O

    |

   O [-

2. ClO4-

   O

    |

Cl - O

    |

   O

    |

   O [-

3. NO3-

   O

    ||

N - O

    |

   O [-

4. SO3

 O

 ||

S - O

 ||

 O

Please note that for SO3, it does not carry any charge (neutral molecule), as requested.

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I think it's c I'm not sure

form the molar concentration of the Ca(OH)2 which is a base we can deduct the pOH

pOH=-lg[OH-]

[OH-]=8.8 x 10-4 M

pOH=4

pH=14-pOH

pH=10

-lg[H+]=10

[H+]=10^-10

The concentration of Hydrogen ion [H⁺] in 8.8×10¯⁴ M Ca(OH)₂ is 5.68×10¯¹² M

The concentration of Hydrogen ion [H⁺] in a solution talks about the acidicity  the solution. Thus, we can obtain the concentration of Hydrogen ion [H⁺] in 8.8×10¯⁴ M Ca(OH)₂ solution as illustrated below:

Data obtained from the question

Concentration of Ca(OH)₂ = 8.8×10¯⁴ M  

Concentration of Hydrogen ion [H⁺] =..?  

Determination of the concentration of Hydroxide ion [OH¯]

 Concentration of Ca(OH)₂ = 8.8×10¯⁴ M

Concentration of Hydroxide ion [OH¯] =?  

Ca(OH)₂ (aq)⇄Ca²⁺ (aq) + 2OH¯(aq)  

From the balanced equation above,  

1 mole Ca(OH)₂ produced 2 moles of OH¯.

Therefore, 8.8×10¯⁴ M Ca(OH)₂ will produce = 8.8×10¯⁴ × 2 = 1.76×10¯³ M

Thus, the Concentration of Hydroxide ion [OH¯] is 1.76×10¯³ M  

Determination of concentration of Hydrogen ion [H⁺].  Concentration of Hydroxide ion [OH¯] = 1.76×10¯³ M

\(H^{+} * OH^{-} = 1*10^{-14}\\H^{+} * 1.76^{-3} = 1*10^{-14}\)

Divide both side by 1.76×10¯³  

\(H^{+} = \frac{1*10^{-14} }{1.76*10^{-3}}\\\)

[H⁺] = 5.68×10¯¹² M  

Therefore, the concentration of Hydrogen ion [H⁺] in the solution is 5.68×10¯¹² M  

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Answer:

The answer would probably be C. The clock can be seen and heard.

Answer:

100.761°C

Explanation:

ΔTb≡Tb−Tb*=iKbm,

where:

ΔTb is the change in boiling point in ∘C, from that of the pure solvent, Tb*, to that of the solution, Tb.

i is the van't Hoff factor, i.e. the effective number of solute particles in solution.

Kb=0.512∘C/m is the boiling point elevation constant of water.

m is the molality of the solution... mol solute/kg solvent. Is the solute volatile or nonvolatile?

Assuming 100% dissociation...

KCl(aq)→K+(aq)+Cl−(aq)

and 1+1=2≈i, so...

Tb=Tb*+iKbm

=100°C+2×0.512°C/m×0.743 m

=100.761°C

The central atom in the PO2 3- anion is phosphorus, and its hybridization is sp3.

To determine the hybridization of the central atom in a molecule or ion, we need to consider its electron geometry and the number of electron groups around the central atom. In the case of the PO2 3- anion, the central atom is phosphorus (P). First, let's examine the electron geometry around phosphorus. Phosphorus has five valence electrons (group 15 on the periodic table) and forms three sigma bonds with oxygen atoms (O). The molecule also has one lone pair of electrons on the phosphorus atom.

The three sigma bonds and one lone pair of electrons result in a tetrahedral electron geometry around phosphorus. This electron geometry suggests that the hybridization of phosphorus involves the mixing of one s orbital and three p orbitals, leading to four sp3 hybrid orbitals. The four sp3 hybrid orbitals of phosphorus form sigma bonds with the oxygen atoms, resulting in a trigonal pyramidal molecular geometry for the PO2 3- anion.

The central atom phosphorus in the PO2 3- anion exhibits sp3 hybridization. This hybridization allows the formation of four sigma bonds with the surrounding oxygen atoms, resulting in a trigonal pyramidal molecular shape. Understanding the hybridization of the central atom helps in predicting the geometry and properties of molecules or ions and is crucial for understanding their reactivity and behavior.

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Answer:

A. The vinegar and baking soda released a gas. Hope it helps. :)

Answer:                                                                                                                                            

A

Explanation: I tried this experiment a few days ago w/ my sister.

It reacted like a volcano explosion.

Answer:

Newton's law of universal gravitation is usually stated as that every particle attracts every other particle in the universe with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.

Answer:

Option A

Explanation:

The total heat absorbed during the chemical reaction is the total heat released by the surrounding.

Net change of heat is equal to zero

Hence, the energy liberated from the air or the walls of the containers would be equal to the energy absorbed by the chemical reactions is equal to 100 Kj

Thus, option A is correct

Answer:

In neutral atom number of electrons (negativity charged particle) and number of proton ( positively charged particle) are equal.

When one or more electrons are lost so positive charge particle increases and cation is formed.

For example in Na 11 electrons and 11 protons are present when it loses one electrons protons are 11 and 10 electron are remaining so one positive charge is present.

Morever when an element gain electrons one negative charge increases and anion is formed. For example in Cl 17 proton and 17 electrons are present when it gain one electron 18 electrons and 17 protons are now present one negative is more so anion negative ion is formed.

Explanation:

Answer:

d. Maderno’s plan

Explanation:

This is the final plan of the St. Peter’s Basilica, the plan of Carlo Maderno, who continued the plans of Michelangelo's plans by adding a nave and a narthex.

Bramante's plan was basically a square, roughly representing the top half of the image provided in the question.

It was modified by Michelangelo who added a section, then extended once more by Maderno who gave it this aspect.

The basilica was finished in 1626, 120 years after the construction began.

In 0.75 moles of caffeine, there are a total of 6 carbon atoms, 7.5 hydrogen atoms, 3 nitrogen atoms, and 1.5 oxygen atoms.

To determine the total number of atoms in 0.75 moles of caffeine, we need to consider the molecular formula of caffeine, which is C8H10N4O2. The molecular formula provides the ratios of each element present in the compound. By multiplying the number of atoms in each element by the corresponding coefficient in the molecular formula, we can calculate the total number of atoms. In this case, there are 8 carbon (C) atoms, 10 hydrogen (H) atoms, 4 nitrogen (N) atoms, and 2 oxygen (O) atoms in each molecule of caffeine. Multiplying these values by 0.75 moles will give us the total number of atoms in 0.75 moles of caffeine.

The molecular formula of caffeine, C8H10N4O2, provides the number of atoms for each element present in one molecule of caffeine. In this case, there are 8 carbon (C) atoms, 10 hydrogen (H) atoms, 4 nitrogen (N) atoms, and 2 oxygen (O) atoms.

To calculate the total number of atoms in 0.75 moles of caffeine, we need to multiply the number of atoms for each element by the coefficient in the molecular formula, and then multiply that by the number of moles (0.75 moles).

For carbon (C): 8 atoms x 0.75 moles = 6 atoms (since there are 8 carbon atoms in one molecule of caffeine).

For hydrogen (H): 10 atoms x 0.75 moles = 7.5 atoms (since there are 10 hydrogen atoms in one molecule of caffeine).

For nitrogen (N): 4 atoms x 0.75 moles = 3 atoms (since there are 4 nitrogen atoms in one molecule of caffeine).

For oxygen (O): 2 atoms x 0.75 moles = 1.5 atoms (since there are 2 oxygen atoms in one molecule of caffeine).

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The reaction between pottasium metal and chlorine gas is an example of combination reaction and the balanced equation is as follows: 2K + Cl₂ → 2KCl

A chemical equation is a symbolic representation of a chemical reaction where reactants are represented on the left, and products on the right.

A chemical equation is said to be balanced when the number of atoms of each element on both sides of the equation are the same.

According to this question, potassium metal reacts with chlorine gas to form solid potassium chloride. The balanced equation is as follows:

2K + Cl₂ → 2KCl

Based on the above equation, pottasium combines with chlorine chemically to form pottasium chloride compound, hence, it is an example of combination reaction.

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Answer:

a list of characteristics that can be used to identify a substance include color, odor, taste, density, melting point, boiling point, conductivity, and hardness.

Answer:

physical or chemical

Explanation:

A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance while a chemical property describes the ability of a substance to undergo a specific chemical change.

The ratio of the mass of compounds:

a. 2Na + Cl\(_{2}\) → 2NaCl = 46 + 70 → 46 : 70

b. H\(_{2}\)O + NaO → 2NaOH = 1 : 8 + 23 : 16 → 23 : 16 : 1

c. HCl + NaOH → NaCl + H\(_{2}\)O = 1 : 35 + 23 : 35 → 23 : 35 + 1: 8

What is a  molecular mass?

Molecular mass refers to the total sum of the masses of the atoms or components that make up the molecule.

Calculation:

a. 2Na + Cl\(_{2}\) → 2NaCl

(Na x 2) + (Cl x 2) → (Na x 2) : (Cl x 2)

(23 x 2) + (35 x 2) → (23 x 2) : (35 x 2)

46 + 70 → 46 : 70

b. H\(_{2}\)O + NaO → 2NaOH

(H x 2) : (O x 1) + (Na x 1) : (O x 1) → (Na x 2) : (O x 2) : (H x 2)

(1 x 2) : (16 x 1) + (23 x 1) : (16 x 1) → (23 x 2) : (16 x 2) : (1 x 2)

2 : 16 + 23 : 16 → 46 : 32 : 2

1 : 8 + 23 : 16 → 23 : 16 : 1

c. HCl + NaOH → NaCl + H\(_{2}\)O

(H x 1) : (Cl x 1) + (Na x 1) : (Cl x 1) → (Na x 1) : (Cl x 1): (H x 2) : (O x 1)

(1 x 1) : (35 x 1) + (23 x 1) : (35 x 1) → (23 x 1) : (35 x 1) : (1 x 2) : (16 x 1)

1 : 35 + 23 : 35 → 23: 35 + 2: 16

1 : 35 + 23 : 35 → 23 : 35 + 1: 8

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In the case of sulfacetamide sodium, the sodium chloride equivalent is 0.25, so the amount of sodium chloride required for isotonicity is 2 mg/mL. In the case of timolol maleate, the sodium chloride equivalent is 0.14, so the amount of sodium chloride required for isotonicity is 1.12 mg/mL.

Sulfacetamide Sodium

E value of sulfacetamide sodium = 0.25

Concentration of sulfacetamide sodium = 8% w/v

Volume of solution = 11 mL

The sodium chloride equivalent of sulfacetamide sodium is 0.25 x 8 = 2 mg/mL.

The total amount of sodium chloride required for isotonicity is 2 x 11 = 22 mg.

Timolol Maleate

E value of timolol maleate = 0.14

Concentration of timolol maleate = 8% w/v

Volume of solution = 11 mL

The sodium chloride equivalent of timolol maleate is 0.14 x 8 = 1.12 mg/mL.

The total amount of sodium chloride required for isotonicity is 1.12 x 11 = 12.32 mg.

However, the calculated amount of sodium chloride for timolol maleate is negative, which means that the solution containing the drug alone is already hypertonic. Therefore, the amount of sodium chloride that would need to be removed to make the solution isotonic is -12.32 mg.

Here is an explanation of the calculations:

The sodium chloride equivalent is a measure of the osmotic pressure of a solute. The higher the sodium chloride equivalent, the higher the osmotic pressure of the solute.

In order for a solution to be isotonic, the osmotic pressures of the solutes in the solution must be equal. Therefore, the amount of sodium chloride required for isotonicity is the amount of sodium chloride that needs to be added to the solution to make the osmotic pressure of the solutes equal to the osmotic pressure of tears.

However, since the calculated amount of sodium chloride for timolol maleate is negative, this means that the solution containing the drug alone is already hypertonic and the amount of sodium chloride that would need to be removed to make the solution isotonic is -12.32 mg.

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The half-life of the reaction is 101.9 min

When a reaction's pace and reactant concentration are inversely correlated, the process is known as a first-order reaction. To put it another way, the reaction rate doubles when the concentration does. One or two reactants can be present in a first-order reaction, as in the case of the decomposition process.

The amount of time it takes for the initial concentration of the reactant(s) to decrease by half is known as the half-life of a chemical reaction (abbreviated as "t1/2").

a→b

25% reacted means 75% remains

t=42 min

Rate constant

k=(2.303/t)(log a/a-x)

k=(2.303/42)(log 100/100-25 )

k=(0.054) (log 100/75)

k=(0.054)(0.1249)

k=0.0068 per min

half life

t1/2=(0.693/k)

     =(0.693/0.0068)

     =101.9 min

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