the molecular formula fits the formula cnh2n , which indicates one degree of unsaturation, meaning either a double bond or ring is present. step 1: start by drawing all the isomers with double bonds.

Answer:

12

Explanation:

Answer:

The atom with the smallest mass is the hydrogen atom; its mass is about 10-27 kg. The masses of other atoms go up to about 200 times this. The nucleus of an atom is about 10-15 m in size; this means it is about 10-5 (or 1/100,000) of the size of the whole atom.

The release of neurotransmitters into the synapse is initiated by depolarization, which opens Ca2+ channels, allowing Ca2+ to move vesicles to the synaptic membrane.

This is the correct answer.When an action potential (AP) arrives at the axon terminal, it results in the opening of voltage-gated Ca2+ channels. The influx of Ca2+ into the nerve terminal causes the exocytosis of neurotransmitter-containing vesicles into the synaptic cleft. Calcium influx is thought to trigger neurotransmitter release via a mechanism that involves Ca2+ binding to the vesicle-associated protein synaptotagmin 1 (Syt1), which promotes the interaction of vesicles with the presynaptic membrane.The entry of Ca2+ through voltage-gated calcium channels is critical for neurotransmitter release, and its absence leads to severe neurological disorders such as ataxia and epilepsy. Calcium ion (Ca2+) is one of the most crucial signaling molecules in cells and is essential for many physiological functions, including neurotransmitter release. Calcium ions activate synaptic vesicle fusion and neurotransmitter release by binding to specific proteins in the active zone of the nerve terminal.

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The source of gases for the secondary atmosphere of the earth was Volcanic Eruptions.

The scientist think that the atmosphere today is completely different from what it used to be originally and therefore they call it secondary atmosphere.

Internal volcanic activity or the deposit of debris from comet collisions produce a secondary atmosphere. 

The secondary atmosphere is thought to have formed as a result of the numerous volcanic eruptions that occurred from the start of Earth's early periods.

Although each volcano is unique, they all emit gases such as H₂O, CO₂, SO₂, H₂S, HCl, N₂, NO₂, and others.

These gases are formed due to melting of the Earth's crust.

Volcanic activity  renew the atmosphere's molecules.

These molecules are not the Nitrogen and Oxygen that make up the atmosphere today.

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Answer: It would be ribosomes..

Explanation:

Answer:

4 mol H₂

General Formulas and Concepts:

Atomic Structure

Aqueous Solutions

Stoichiometry

Explanation:

Step 1: Define

[RxN - Balanced] 2H₂ (g) + O₂ (g) → 2H₂O (l)

[Given] 4 mol H₂O

[Given] mol H₂

Step 2: Identify Conversions

[RxN] 2 mol H₂ (g) → 2 mol H₂O (l)

Step 3: Stoichiometry

Answer:

qns-4

1-multicellular organism

2-unicellular organism

3-unicellular organism

4-multicellular organism

5-unicellular organism

6-multicellular organism

7-unicellular organism

Answer:

26.78 kJ

Explanation:

To solve the problem, we have to first write the stoichiometric coefficients in the chemical equation:

2P + 3Cl₂ → 2PCl₃

With these coefficients, we have the same number of atoms of each chemical element on both sides: 2 atoms of P, 6 atoms of Cl.

According to the equation, 2 moles of phosphorous (P) react with 3 moles of chlorine (Cl₂), and 574 kJ of energy are released. We have to figure out which is the limiting reactant. For this, we convert the mass into moles by using the molar mass(MM):

MM(P) = 30.9 g/mol

67.04 g P/(30.9 g/mol) = 2.17 mol P

MM(Cl₂) = 35.4 g/mol x 2 = 70.8 g/mol

10.20 g Cl₂/(70.8 g/mol) = 0.14 mol Cl₂

Now, we multiply the actual moles of P (the amount we have for the reaction) by the stoichiometric ratio given by the chemical equation (3 mol Cl₂/2 mol P):

2.17 mol P x (3 mol Cl₂/2 mol P) = 3.25 mol Cl₂

To completely react 67.04 g P, we need 3.25 mol of Cl₂, and we have only 0.14 moles of Cl₂, so the limiting reactant is Cl₂.

Now, we use the limiting reactant to calculate the energy released from the reaction. The energy released per mole of Cl₂ is:

ΔH/(3 mol Cl₂) = -574 kJ/3 mol Cl₂= 191.3 kJ/mol Cl₂

Finally, we multiply the energy released per mole of Cl₂ by the number of moles of Cl₂ we have:

0.14 mol Cl₂ x 191.3 kJ/mol Cl₂ = 26.78 kJ

The energy of a rogue wave with an amplitude of 15 meters is 2,207,250 joules.

To do this, we need to use the following terms: potential energy, kinetic energy, and wave energy. Here's the step-by-step explanation:

1. Determine the amplitude (A) of the rogue wave: In this case, the amplitude is given as 15 meters.

2. Calculate the potential energy (PE):

The potential energy of a wave is given by the formula PE = (1/2)ρgA², where ρ is the density of water (approximately 1000 kg/m³), g is the acceleration due to gravity (9.81 m/s²), and A is the amplitude. Plugging in the values, we get PE = (1/2) * 1000 * 9.81 * (15)² = 1,103,625 J (joules).

3. Calculate the kinetic energy (KE): The kinetic energy of a wave is equal to its potential energy, so KE = 1,103,625 J.

4. Calculate the total wave energy (E): The total energy of a rogue wave is the sum of its potential and kinetic energy, E = PE + KE = 1,103,625 + 1,103,625 = 2,207,250 J.

So, the energy of a rogue wave with an amplitude of 15 meters is 2,207,250 joules.

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O₂

A limiting reactant is the reactant that runs out first in a reaction.

Oxygen

To find the limiting reactant, we can find how many reactions will occur with the given amount of reactant. To do this we can divide moles of the reactant by moles per reaction. If the reaction occurs 1 time, we say that 1 mol of reaction is created. So, the reactant that forms fewer moles of reaction is the limiting reactant.

This means that with 12 moles of oxygen, 1 full reaction will occur (1 mol of reaction).

Naphthalene (C₁₀H₈)

Now, we can do the same equation with Naphthalene. If it creates fewer moles of reaction, then it is the limiting reactant. If not, then oxygen is the limiting reactant.

This means that 1.1 moles of Naphthalene will create 1.1 mol of reaction.

Limiting Reactant

The math above shows that the amount of oxygen given will only create 1 mol of reaction, while the Naphthalene forms 1.1 mols of reaction. Thus, oxygen is the limiting reactant because it creates fewer moles of reaction.

Answer:

.234 M

Explanation:

Molarity, or concentration, of a substance is simply found by dividing the amount of that substance in moles by its volume. Here, we are given the mass (in grams) of Kool-Aid, so we need to convert that to moles. To do this, we simply need the chemical formula of Kool-Aid, which I have found to be C12H22O11. The molar mass of C12H22O11, using the periodic table, is 342.296 g. Next, take this molar mass and divide the given mass of Kool-Aid by it. You then get about .234 mol Kool-Aid.

Lastly, divide this by the volume of 1.0 L. You get .234 M as your final molarity.

Answer:

Chloroplast

Explanation:

The percentage composition of this compound : 40%Ca, 12%C and 48%O

Given

20.0 g of calcium,

6.0 g of carbon,

and 24.0 g of oxygen.

Required

The percentage composition

Solution

Total mass of compound :

=mass calcium + mass carbon + mass oxygen

=20 g + 6 g + 24 g

=50 g

Percentage composition :

\(\tt \dfrac{20}{50}\times 100\%=40\%\)

\(\tt \dfrac{6}{50}\times 100\%=12\%\)

\(\tt \dfrac{24}{50}\times 100\%=48\%\)

Answer:

Although chlorine itself usually does not cause environmental harm, it combines rapidly to form chemicals such as dioxins that pollute water, contaminate fish and transfer to humans and larger animals that eat the fish.

Explanation:

Answer: The final volume of this solution is 0.204 L.

Explanation:

Given: Molarity of solution = 2.2 M

Moles of solute = 0.45 mol

Molarity is the number of moles of solute present divided by volume in liters.

\(Molarity = \frac{no. of moles}{Volume (in L)}\)

Substitute the values into above formula as follows.

\(Molarity = \frac{no. of moles}{Volume (in L)}\\2.2 M = \frac{0.45}{Volume}\\Volume = 0.204 L\)

Thus, we can conclude that the final volume of this solution is 0.204 L.

Answer:

Weak electrolyte

Explanation:

weak bases are ammonia (NH3), methylamine (CH3NH2), and ethylamine (C2H5NH2)

The term that describes the electrolyte capacity of methylamine (CH₃NH₂) which partially dissociates in water is Weak electrolyte.

Because it dissolves in water only partially into ions, methylamine (CH₃NH₂)  is a weak electrolyte. A small amount of electrical current can conduct when certain methylamine molecules split apart into ions CH₃NH₃⁺ and OH⁻ in a solution. Weak electrolytes have a moderate level of electrical conductivity compared to strong electrolytes which almost entirely dissociate into ions and non-electrolytes which do not dissociate.

This is because weak electrolytes exhibit intermediate conductivity due to their partial ionization. Understanding this behavior is crucial for understanding how solutions behave and how weak acids and bases like methylamine, affect chemical reactions.

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Explanation: The concentration of a solution helps us to determine the collision speed between particles in a molecule or compound. Knowing the concentrations of components in solutions can help determine the health of the world.

Answer:

Inferred that fossils were once part of living animals.

Explanation:

He realized that seashells that were from rocks were identical to ones on a beach.

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Answer:

1) AgNO3 (aq) + KCl (aq) -> AgCl (s) + KNO3 (aq)

Ag+ (aq) + NO3- (aq) + K+ (aq) + Cl- (aq) -> AgCl (s) + K+

(aq) + Cl- (aq)

Ag+ (aq) + Cl- (aq) -> AgCl (s)

2) 2NaCl (aq) + K2CO3 (aq) -> Na2CO3 (aq) + 2KCl (aq)

3) Fe(NO3)3 (aq) + 3NaOH (aq) -> Fe(OH)3 (s) + 3NaNO3

(aq)

Fe³+ (aq) + 3NO3- (aq) + 3Na+ (aq) + 3OH- (aq) ->

Fe(OH)3 (s) + 3Na+ (aq) + 3NO3- (aq)

Fe³+ (aq) + 3OH- (aq) -> Fe(OH)3 (s)

4) BaBr2 (aq) + Na2SO4 (aq) -> BaSO4 (s) + 2NaBr (aq)

Ba²+ (aq) + 2Br- (aq) + 2Na+ (aq) + SO4²- (aq) ->

BaSO4 (s) + 2Na+ (aq) + 2Br- (aq)

Ba²+ (aq) + SO4²- (aq) -> BaSO4 (s)

Explanation:

Sorry, I couldn't make the charges superscript. Don't know how.

On #2, no reaction occurs; everything stays aqueous.

Answer:

evaporate

Explanation:

after water or any other solvent has mixed with satt stirr the mixture then heat it the water will evaporate leaving the solute (salt) behind

Answer:

Balanced equation:

The balanced chemical equation for the reaction between aqueous barium nitrate and aqueous iron(II) sulfate is:

Ba(NO3)2(aq) + FeSO4(aq) → BaSO4(s) + Fe(NO3)2(aq)

Complete Ionic equation:

The complete ionic equation for the reaction between aqueous barium nitrate and aqueous iron(II) sulfate is:

Ba^2+(aq) + 2NO3^-(aq) + Fe^2+(aq) + SO4^2-(aq) → BaSO4(s) + Fe^2+(aq) + 2NO3^-(aq)

Net Ionic equation:

The net ionic equation is obtained by cancelling out the spectator ions (ions that appear on both sides of the equation and do not participate in the reaction) from the complete ionic equation. The spectator ions in this case are Ba^2+ and 2NO3^-. The net ionic equation for the reaction between aqueous barium nitrate and aqueous iron(II) sulfate is:

Fe^2+(aq) + SO4^2-(aq) → BaSO4(s)

Out of the four given options, the most abundant natural radionuclide is potassium-40. Option a.

Potassium-40 is a naturally occurring radioactive isotope of potassium, and it is present in various materials such as rocks, soils, and minerals. It is estimated that potassium-40 accounts for about 0.012% of the total potassium present on Earth. Although uranium-238 and thorium-232 are also abundant natural radionuclides, their concentrations in the Earth's crust are lower compared to that of potassium-40. Rubidium-87 is relatively rare compared to the other three options and is typically found in very small quantities in minerals such as mica and feldspar. Hence, potassium-40 is the most abundant natural radionuclide out of the given options. Option a.

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The correct answer for the blank/reference/zero absorbance in spectrophotometry depends on the specific analysis being performed.(a)deionized water.

However, deionized water is a commonly used blank/reference solution in many types of spectrophotometric analyses.

A blank solution is used to calibrate the spectrophotometer by measuring its absorbance, which is set to zero, so that any absorbance detected from the subsequent samples can be attributed to the analyte of interest. In the case of deionized water, it is a stable and readily available solution that absorbs very little light in the UV-visible range. This makes it an ideal choice for many spectrophotometric analyses. Other substances, such as acetylsalicylic acid standard solution or iron(III) chloride solution, may be used as a blank/reference solution in specific analyses where deionized water may not be appropriate. For example, in the analysis of the acetylsalicylic acid-iron(III) complex, the solution containing only the iron(III) chloride would serve as the blank/reference solution since it absorbs light in the same wavelength range as the complex. The addition of acetylsalicylic acid to the iron(III) chloride solution forms a violet-colored complex that can be quantified by measuring its absorbance.

In summary, the choice of blank/reference solution in spectrophotometry depends on the specific analysis being performed and the properties of the analyte and blank/reference solution. However, deionized water is a commonly used blank/reference solution in many types of spectrophotometric analyses due to its low absorbance in the UV-visible range.

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Answer:

Chemical energy

Explanation:

The energy stored in the bonds of atoms and molecules, is chemical energy .

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Answer: Chemical energy. :]

Explanation:

Answer:

Pressure decreases with increasing altitude

Explanation:

At higher elevations, there are less air moecules.

Explanation:

The pressure exerted by the air in the atmosphere is greatest at Earth's surface and falls as altitude increases. The reason is that density and depth of the atmosphere are greatest at sea level and decline with increasing altitude.

Answer:

43.76 g = 0.04376 Kg

Explanation:

The equation of the reaction is given as;

H2 + Cl2 --> 2HCl

From the equation;

1 mol of Cl2 produces 2 mol of HCl

Converting to mass;

Mass = Number of mol * Molar mass

Cl2;

Mass = 1 mol * 70.906 g/mol = 70.906 g

HCl;

Mass = 2 mol * 36.458 g/mol = 72.916 g

This means;

70.906 g of Cl2 produces 72.916 g of HCl

x g of Cl2 would produce 45g of HCl

70.906 = 72.916

x = 45

x = 45 * 70.906 / 72.916

x = 43.76g

Answer:

k,39

Explanation:

Is the answer

Answer:

d

Explanation:

It is developing a fast railway that will run between Boston and Atlanta. The journey must be made by the train in six hours. The right answer is D.

A high-speed train is a form of transportation that is utilized to get people or goods from one location to another due to the engineering that went into its creation. It helps to reach the destination as soon as possible.

High-speed trains are intended to enhance the train's speed so that it can arrive at the designated location on time. This is accomplished by improving the trains' efficiency, which results in an increase in energy consumption.

As a result, Choice D is right. It is developing a fast railway that will run between Boston and Atlanta. The excursion must be accomplished by the train in six hours.

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The correct choice is A) −5Δ[Br−]/Δt. The rate expressed as Δ[Br2]/Δt is proportional to -5 times the rate of change of Br−.

In the given reaction 5Br−(aq) + BrO3−(aq) + 6H+(aq) → 3Br2(aq) + 3H2O(aq), the stoichiometric coefficients provide information about the relationship between the reactants and products. To determine the rate expressed as Δ[Br2]/Δt, we need to compare it with the rate of change of the other species.

Based on the balanced equation, for every 5 moles of Br− consumed, 3 moles of Br2 are produced. Therefore, the rate of change of Br−, Δ[Br−]/Δt, is related to the rate of change of Br2, Δ[Br2]/Δt, by a factor of -5/3.

The other choices, B) −0.6Δ[Br−]/Δt, C) 3Δ[BrO3−]/Δt, and D) −Δ[H2O]/Δt, do not correspond to the correct relationship based on the stoichiometric coefficients of the reaction. Therefore, the correct answer is A) −5Δ[Br−]/Δt.

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