2 points
Identify the basic law on the behavior of matter: States that mass is
neither created nor destroyed in a chemical reaction or physical changes.
Law of conservation of mass
Law of definite proportions
Law of multiple proportions
Identify the scientist that contributed to the atomic theory: He conducted 2 points
d the nucleus has a nositive charge.

0.0174 M is the calculated [H₃O+] for 0.0087 M H₂SO₄.  Molarity is an important concept in chemistry.

Molarity, which is defined as the number of moles of solute dissolved per liter of solution, is a measure of a solution's concentration. It is often written with the symbol "M" and is measured in moles per liter (mol/L) units.

The molarity of a solution is determined by dividing the volume of the solution in liters by the number of moles of the solute present in that volume. because it allows us to quantify the amount of substance present in a solution. It is frequently used in stoichiometric calculations to determine the amounts of a chemical reaction's reactant and product that should be known. For instance, if a solution contains 2 moles of solute dissolved in 1 liter of solution, the molarity of the solution is 2 mol/L.

Because it fully dissociates in water, H₂SO₄ is a powerful acid that produces two H+ ions for every molecule that dissociates. As a result, the [H₃O+] in a solution of 0.0087 M H₂SO₄ is twice as molten as the H₂SO₄ solution: [H₃O+] = 2 x [H+] = 2 x 0.0087 M = 0.0174 M.

Accordingly, the [H₃O+] of a H₂SO₄ solution containing 0.0087 M is 0.0174 M.

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Answer:

sp3.

.....................

The pH of a buffer solution prepared from 0.0500 M hydrofluoric acid (HF) and 0.00500 M sodium fluoride (NaF) can be calculated using the Ka value of HF.

To determine the pH of the buffer solution, we need to consider the equilibrium reaction between hydrofluoric acid (HF) and its conjugate base, fluoride ion (F-):

HF + H2O ⇌ H3O+ + F-

The Ka expression for this equilibrium can be written as:

Ka = [H3O+][F-] / [HF]

Given that the Ka value of HF is 6.8 x 10^-4, we can set up an ICE table to determine the concentrations of the species involved:

Initial concentrations:

[HF] = 0.0500 M

[F-] = 0.00500 M

[H3O+] = 0 (since the initial pH is not given)

Change in concentrations:

Let's assume that x mol/L of HF dissociates. Therefore, the change in concentrations is:

[HF] = 0.0500 M - x

[F-] = 0.00500 M + x

[H3O+] = x

At equilibrium, the concentrations become the equilibrium concentrations.

Using the Ka expression, we can substitute the equilibrium concentrations and solve for x:

Ka = [H3O+][F-] / [HF]

6.8 x 10^-4 = x * (0.00500 + x) / (0.0500 - x)

Since the value of x is expected to be small compared to 0.0500 M, we can approximate 0.0500 - x to be approximately 0.0500. Simplifying the equation:

6.8 x 10^-4 = x * (0.00500 + x) / 0.0500

Next, we can solve this equation to find the value of x using algebraic methods, such as factoring or quadratic formula. After solving for x, we can determine the equilibrium concentrations of [HF], [F-], and [H3O+].

Finally, we can calculate the pH using the equation:

pH = -log[H3O+]

Note: The detailed calculations to solve for x and determine the equilibrium concentrations are not included in the response due to space constraints.

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2.758 L Of liquid nitrogen are produced when gas is liquefied.

We are converting gaseous nitrogen to liquid nitrogen. Both of these substances have different densities. Therefore they will occupy different volumes . But they will have the same mass.

Step 1 : Find mass of nitrogen gas

So let us find out the mass of nitrogen gas occupied by 489 L .

The formula for density is, D = Mass / Volume

Density of nitrogen gas 4.566 g/L and the volume occupied by it is 489 L.

Let us plug in these values to find the mass of nitrogen gas.

The equation can be modified as follows.

Mass = Density × Volume

Mass = 4.566 / L × 489

Mass = 2232g

The mass of nitrogen gas is 2232 g.

Step 2 : Find the volume of a liquid nitrogen using the mass

The mass of a liquefied nitrogen is also the same.

Whereas, the density of liquid nitrogen is 809 g/L

Let us plug in this value of mass to find the volume of the liquid.

Volume = 2232 / 809g / L

Volume = 2.758 L

The volume of liquid nitrogen is 2.758 L

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2-7-1

Electrons can move the shell up or down by releasing energy or absorbing energy  

Excited electrons show higher electron transfer to the shell by absorbing energy  

So it can be concluded that there are 2 conditions:  

Ground state is the state of electrons filling shell with the lowest energy levels.  

Excited state is the state of electrons which occupies a higher energy level  

The state of excited electrons can be seen from the presence of electrons which do not fill the skin completely but fill the skin afterward  

2-7-1

From its 8 electron configuration, filling 3 shells, 2 electrons in the firs shell, 7 electrons in the second shell and 1 electron in the third shell

the electrons in the third shell should fill the electrons in the second shell first according to Aufbau rule (lower energy shells)

\(\tt 1s^22s^22p^4\rightarrow ground~state\\\\1s^22s^22p^33s^1\rightarrow excited~state\)

Answer:

Explanation:

pls mark brainliest

Answer:

4.56 liters

Explanation:

that's the quizziz answer

The gas laws are used to calculate the volume of the gas that can be given by the pressure and the temperature. At 8.25 atm the volume of the gas is 4.56 L.

The ideal equation includes the pressure, volume, temperature, and moles of the gas in a hypothetical system.

Given,

P₁ =2.97 atm

V₁ = 9.55 L

T₁ = 300.15 K

P₂ = 8.25 atm

T₂ = 398.15 k

The final volume is calculated as:

P₁V₁ ÷ T₁ = P₂V₂ ÷ T₂

(2.97 × 9.55) ÷ 300.15 = (8.25 × V) ÷ 398.15

V = (28.36 × 398.15) ÷ (300.15 × 8.25)

V = 11292.92 ÷ 2476.23

= 4.56 L

Therefore, 4.56 L is the final volume.

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The quantity that would be most helpful to know in order to determine the temperature rise of a particular piece of material when a known amount of heat is added to it is the specific heat (option b).

The specific heat of a substance is a measure of its ability to absorb heat energy without a significant change in temperature. It represents the amount of heat required to raise the temperature of a unit mass of the material by one degree. By knowing the specific heat of the material, along with the mass of the material and the amount of heat added, you can calculate the resulting temperature change using the equation:

Q = mcΔT

where Q is the amount of heat added, m is the mass of the material, c is the specific heat, and ΔT is the change in temperature.

Knowing the initial temperature (option a), coefficient of linear expansion (option c), or thermal conductivity (option d) may provide additional information about the material's behavior, but they are not directly related to determining the temperature rise when heat is added.

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Answer:0

Explanation: zero because it is the most stable form of oxygen in its standard state

The correct option is D, The best way to ensure complete precipitation of SnS from a saturated H2S solution is to add a strong acid. This is because the addition of a strong acid will neutralize any unreacted H2S, which would otherwise maintain the solution in a saturated state.

Precipitation refers to the process of a solid substance forming within a liquid mixture, resulting in the formation of a solid compound or particle that settles out of the liquid phase. This occurs when the concentration of a solute in a solution exceeds its solubility limit at a given temperature and pressure. The excess solute molecules aggregate together to form insoluble particles, which then fall out of solution and settle at the bottom of the container.

This process can be initiated by the addition of a precipitating agent that causes the formation of an insoluble product, or by a change in temperature, pressure, or pH that alters the solubility of the compound. Precipitation is commonly used in analytical chemistry to isolate and identify specific compounds, as well as in industrial processes such as wastewater treatment and mineral recovery.

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The mass percent of hydrogen in CH₄O is 12.5%.

Mass percent is the mass of the element divided by the mass of the compound or solute.

mCH₄O = 1 mC + 4 mH + 1 mO = 1 (12.01 amu) + 4 (1.00 amu) + 1 (16.00 amu) = 32.01 amu

mH in mCH₄O = 4 mH = 4 (1.00 amu) = 4.00 amu

%H = (mH in mCH₄O / mCH₄O) × 100%

%H = 4.00 amu / 32.01 amu × 100% = 12.5%

The mass percent of hydrogen in CH₄O is 12.5%.

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Answer: 355

Explanation: Given the molecular weights:

M

r

N

a

O

H

=

40

g

m

o

l

M

r

N

a

2

S

O

4

=

142

g

m

o

l

The analogy of the moles will be held constant:

n

N

a

O

H

n

N

a

2

S

O

4

=

2

1

n

N

a

O

H

n

N

a

2

S

O

4

=

2

For each one, substitute:

n

=

m

M

r

Therefore:

n

N

a

O

H

n

N

a

2

S

O

4

=

2

m

N

a

O

H

M

r

N

a

O

H

m

N

a

2

S

O

4

M

r

N

a

2

S

O

4

=

2

200

40

x

142

=

2

200

⋅

142

40

x

=

2

200

⋅

142

=

2

⋅

40

x

x

=

200

⋅

142

2

⋅

40

=

100

⋅

142

40

=

10

⋅

142

4

=

1420

4

=

=

710

2

Given the molecular weights:

M

r

N

a

O

H

=

40

g

m

o

l

M

r

N

a

2

S

O

4

=

142

g

m

o

l

The analogy of the moles will be held constant:

n

N

a

O

H

n

N

a

2

S

O

4

=

2

1

n

N

a

O

H

n

N

a

2

S

O

4

=

2

For each one, substitute:

n

=

m

M

r

Therefore:

n

N

a

O

H

n

N

a

2

S

O

4

=

2

m

N

a

O

H

M

r

N

a

O

H

m

N

a

2

S

O

4

M

r

N

a

2

S

O

4

=

2

200

40

x

142

=

2

200

⋅

142

40

x

=

2

200

⋅

142

=

2

⋅

40

x

x

=

200

⋅

142

2

⋅

40

=

100

⋅

142

40

=

10

⋅

142

4

=

1420

4

=

=

710

2

= 355 GMS

The dot structure that can be shown to be incorrect is the dot structure that has been shown by option A

The Lewis structure is based on the concept that atoms tend to gain, lose, or share electrons in order to achieve a stable electron configuration similar to that of a noble gas. In the Lewis structure, the valence electrons of the atoms are represented as dots around the symbol of the atom.

We can see that in the dot structure that is in option A the both atoms are coming from the hydrogen atoms and shoud not be differently marked.

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Adenosine triphosphate (ATP) serves as the monophosphate transfer agent in the phosphorylation of the insulin receptor substrate (IRS) by the tyrosine kinase. Through this process, ATP donates a phosphate group to specific tyrosine residues on IRS, initiating downstream signaling pathways involved in glucose uptake and cellular metabolism. The correct option is a.

The monophosphate transfer agent used in the phosphorylation of the insulin receptor substrate (IRS) by the tyrosine kinase is adenosine triphosphate (ATP).

ATP is a nucleotide that serves as the primary energy currency of cells. It is involved in various cellular processes, including signal transduction and phosphorylation reactions.

In the case of IRS phosphorylation, the insulin receptor activates its tyrosine kinase activity upon binding with insulin.

The activated tyrosine kinase then catalyzes the transfer of a phosphate group from ATP to specific tyrosine residues on the IRS protein.

Phosphorylation is a crucial mechanism for cellular signaling. The addition of phosphate groups to proteins like IRS can modulate their function and initiate downstream signaling cascades.

Once phosphorylated, IRS acts as a docking protein for other signaling molecules, leading to the activation of various intracellular pathways that regulate processes such as glucose uptake, cell growth, and metabolism.

ATP provides the necessary phosphate group for the tyrosine kinase to transfer onto IRS during this phosphorylation event.

By harnessing the energy stored in ATP, the tyrosine kinase enzyme can carry out the phosphorylation reaction, thereby initiating the insulin signaling pathway.

Hence, the correct option is a) ATP.

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Complete question:

a) ATP

b) GTP

c) AMP

d) UTP

The biggest amount of CO₂ produced when 2 moles of C₂H₂ reacted with 1 mole of O₂ is 0.8 mole.

A mole is 6.02214076 x 1023 of the any chemical unit, comprising atoms, molecules, ions, and others. Because of the large number of atoms, molecule, or other components that make up any substance, the mole is a useful measure to utilize

We'll start by writing the balanced reaction equation.This is given below:

2C₂H₂ + 5O₂ —> 4CO₂ + 2H₂O

      2    :   5

      2    :    1

We can see from the above balanced equation that O2 is the limiting reagent because there is a limited supply of it.

Finally, using the limiting reagent shown below, we will calculate the highest amount of CO2 that was produced:

5 moles of O2 interacted to create 4 moles of CO2 using the equation above.

So,

when 1 mole of O2 reacts, it will result in = 4/5 = 0.8 moles of CO2.

Therefore, 0.8 moles of CO2 are the most that the reaction can create.

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Density is defined as the mass of a substance per unit volume. In this case, the density of urine is given as 1.02 g/ml. This means that for every 1 ml of urine, there is 1.02 g of mass.

To find the mass of urine eliminated by the patient in one day, we need to multiply the volume of urine by its density. The volume of urine is given as 1250 ml.

Mass of urine = Volume of urine x Density of urine

Mass of urine = 1250 ml x 1.02 g/ml

Mass of urine = 1275 g

Therefore, the mass of urine eliminated by the patient in one day is 1275 g.

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Matter and energy move in and out of the atmosphere through several processes.

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Answer:

The flow of thermal energy in a system, at constant atmospheric pressure AND at thermodynamic standard temperature and pressure.

The most stable contributor's structure is the genuine structure of the resonance hybrid. The delocalization of electrons is what stabilizes the resonance hybrid. The potential resonance forms are quickly interconverted by a resonance hybrid.

Equivalent resonance types equally contribute to the hybrid's overall structure. Consider the resonance hybrid structure of a carboxylate group as an example. Different resonance contributors do not always contribute equally to the hybrid structure until they are equivalent to one another in terms of stability, as is the case for the carboxylate group, which has equivalent contributions from A and B as shown in the given figure. One resonance structure will more closely resemble the “actual” (hybrid) structure than another if it is more stable (lower in energy) than the other.

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Answer:

Its a

Explanation:

i took the quiz

The sentence that is inappropriate in an informational piece of writing with a formal tone is "People find Shakespeare's Pericles, Prince of Tyre boring and annoying because it's possible that he didn't even write the entire play." The correct option is A.

In academic or professional settings, a formal writing tone is common. This tone emphasizes thoroughness and directness while remaining respectful.

It emphasizes facts and grammatical correctness and uses full words rather than contractions.

The use of standard English, more complex sentence structures, the infrequent use of personal pronouns, and the absence of colloquial or slang terms characterize formal language.

In informal language, nonstandard English forms, colloquial vocabulary, and typically shorter sentence structures are permitted.

"People find Shakespeare's Pericles, Prince of Tyre boring and annoying because it's possible that he didn't even write the entire play," is an inappropriate sentence in a formal informational piece of writing.

Thus, the correct option is A.

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Answer:

37.84 Liters

Explanation:

(see picture)

The balanced equation for the given reaction is Na\(_2\)S\(_2\)O\(_3\) (aq) + 2HCL (aq) → H\(_2\)O (l) + SO\(_2\) (g)+ 2 NaCl (aq) + S (s).

A chemical equation is said to be balanced if the quantity of each type of atom in the reaction corresponds to one another on both the reactant and product sides. In an equilibrium chemical equation, the mass and the change are both equal. A chemical equation must balance according to the rule of conservation of mass. The balanced equation for the given reaction is Na\(_2\)S\(_2\)O\(_3\) (aq) + 2HCL (aq) → H\(_2\)O (l) + SO\(_2\) (g)+ 2 NaCl (aq) + S (s).

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The the mass of the heavier isotope of chlorine (in amu) is 73.932 amu.

The term isotopes refers atoms that have the same atomic number but different mass number. We must know that all these atoms belong to the same element an differ only in the number of neutrons present in the atom of the element. Hence isotopes are different atoms of the same element hence they have the same chemical properties or reactivity. The mass spectrum is able to show the masses of each of the isotopes according to their order of relative abundance in nature.

Looking at the peaks, we know that the heaviest isotope is the one whose mass will have the highest peak as shown in the mass spectrum of the element as shown. Thus, the the mass of the heavier isotope of chlorine (in amu) is 73.932 amu. The mass spectrum of element also shows this fact.

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Answer/Explanation:

Animals are multicellular heterotrophic organisms, meaning they cannot generate their own food, they rely on external sources of nutrition.

Protists are any eukaryotic organism that cannot be classified as an animal, plant, or fungus. The grouping is more used for convenience than anything else.

Like animals, animal-like protists can move freely and are heterotrophic. However, unlike animals, they are usually unicellular, and much simpler than animals

The molality of the CaCl₂ solution given that 166.5 g of CaCl₂ dissolves in 3.5 Kg of water is 0.429 M

This is the defines as the mole of solute per unit mass (in Kilogram) of water.

Molality = mole / mass of water (in Kg)

The mole of 166.5 g of CaCl₂ can be obtained as illustrated below:

Mole = mass / molar mass

Mole of CaCl₂ = 166.5 / 111

Mole of CaCl₂ = 1.5 moles

The molality of the CaCl₂ solution can be obtained as illustrated below:

Molality = mole / mass of water (in Kg)

Molality of CaCl₂ = 1.5 / 3.5

Molality of CaCl₂ = 0.429 M

Thus, the molality of the solution is 0.429 M

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G) Since the boiling point of Fluorine is -188°C, at room temperature Fluorine will be a gas

H) Ionization energy and electronegativy are related to the ability to form ions, they can be measured in values, for Ionization energy, fluorine has a value of 17.42, which is a high value, and for electronegativity is 3.98, one of the highests

I) Fluorine is in the group 7A, also known as halogens, and in the second period

J) Some popular compound that will have Fluorine in its composition will be: CaF2 (Calcium fluoride), HF (Hydrogen fluoride) and NaF (Sodium fluoride)

K) Fluorine can protect us from dental decay, this is why is widely used in toothpastes

L) Fluorine will be mostly found in minerals, rocks, coal and clay

M) Fluorine is the most reactive and most electronegative element of the whole periodic table

Answer:

chemical energy is your correct answer mark me brainly

Answer:

The answer is D

Explanation: