A combustion reaction is represented by __________________.

A. AB + C yields CB + A
B. A + B yields AB
C. Fuel + oxygen yields carbon dioxide + water
D. AB yields A + B
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Answer:

1.72 g/cm ^3

Explanation:

Answer: 3p Orbitals

Explanation:

Electrons present in the 3p orbitals are farthest from the nucleus. Therefore, the electrons present in the 3p orbital will be shielded by the electrons present in the inner orbitals. Hence, 3p orbital in sulfur is most shielded from the nuclear charge".

An electron in 3p orbital of sulfur is most shielded from nuclear charge. It is true that the core electrons effectively protect the surrounding electrons from nuclear charge.

The elementary electric charge of the electron is a negative one, making it a subatomic particle. Due to their lack of known components or substructure, electrons, which are members of the first generation of the lepton particle family, are typically regarded to be elementary particles.

The atom is made up of the subatomic particles electron, proton, and neutron. The atom is made up of a core nucleus that has neutrons and protons in it. The nucleus is surrounded by electrons. Protons are positively charged, neutrons are neutral, and electrons are negatively charged.

The shielding ability of an electron in a s orbital is higher than that of an electron in a p or d orbital of the same shell. Additionally, electrons in s orbitals are less well protected by electrons in other orbitals due to their high penetrating nature.

Thus, An electron in 3p orbital of sulfur is most shielded from nuclear charge.

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Answer:

be careful to not hurt yourself

Answer: make sure the liquid is pointing away from the face

Explanation:

London dispersion forces are the correct answer for how molecules of methane are held in place in frozen methane.

Option D.

These forces are a type of intermolecular force that occurs between nonpolar molecules, like methane. London dispersion forces are the result of temporary fluctuations in electron density within a molecule. This fluctuation creates an instantaneous dipole moment, which induces a dipole moment in a neighboring molecule. The interaction between these dipoles creates a weak attraction between the molecules, which holds them in place in the solid state.
Covalent bonds occur between atoms when they share electrons. Ionic bonds involve the transfer of electrons from one atom to another, creating ions that are attracted to each other. Hydrogen bonds occur between hydrogen atoms that are covalently bonded to a highly electronegative atom, like oxygen or nitrogen. Osmotic pressure is a property of solutions, and is related to the concentration of solute particles in a solution. It is not relevant to the way that molecules of methane are held in place in a solid state.
Option D.

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The equilibrium constant, represented as Kc or Keq, is a value that expresses the extent of a chemical reaction at equilibrium

The characteristics of the equilibrium constant include:

It is a constant value: The equilibrium constant has a fixed value at a given temperature and pressure for a particular chemical reaction. It is independent of the initial concentrations (or partial pressures) of the reactants and products, and it does not change with time once equilibrium has been reached. It is related to the degree of completion of a reaction: The magnitude of the equilibrium constant indicates the degree to which a reaction has proceeded towards completion. It is affected by temperature: The equilibrium constant is dependent on temperature.  It depends on the stoichiometry of the reaction: The equilibrium constant is calculated based on the stoichiometry of the balanced chemical equation for the reaction. It can be used to predict the direction of the reaction: The value of the equilibrium constant can be used to predict the direction in which the reaction will proceed under certain conditions.

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Answer:

The alkaline earth metals are six chemical elements in group 2 of the periodic table. They are beryllium, magnesium, calcium, strontium, barium, and radium.

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(a)The pH of the fruit juice solution is approximately 3.5. (b) The hydrogen ion concentration of the tomato solution is 0.001 mol/L.

(b)The hydrogen ion concentration of the tomato solution is 0.001 mol/L.

(a). The hydrogen ion concentration of the fruit juice is 0.0003 mol/L. We can determine the pH of the solution using the formula pH = -log[H⁺].

pH = -log(0.0003)

pH ≈ -log(3 × 10⁻⁴)

Using a calculator, we can calculate the logarithm:

pH ≈ -(-3.5229) (rounded to the nearest tenth)

pH ≈ 3.5

Therefore, the pH of the fruit juice solution is approximately 3.5.

(b). A tomato has a pH of 3.0. We can determine the hydrogen ion concentration of this solution by rearranging the formula pH = -log[H⁺] to solve for [H⁺].

[H⁺] = 10(-pH)

[H⁺] = 10⁻³

[H⁺] = 0.001 mol/L

Therefore, the hydrogen ion concentration of the tomato solution is 0.001 mol/L.

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From one of the most acidic via least acidic, these compounds' bold-faced hydrogens are II > III > V > IV > I.

Why do you use the word "acidity"?

Acidity explains how much acid is present in a material. An acid is a substance that releases hydrogen ions into water and reacts with certain metals to generate salts.

According to the given question:

The strong acids are those which completely ionizes in the aqueous solution. the strong acid will losses more H⁺ ion when it dissolved in the water. The weak acids are those which are partially ionizes in the aqueous solution.  the strong acid will losses few H⁺ ion when it dissolved in the water.

Therefore from most acidic via least acidic, these compounds' bold-faced hydrogens are II > III > V > IV > I.

The complete question is-

Rank the bold-faced hydrogens for the following compounds from most acidic to least acidic. (Attachment below for options)

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Answer:

Correct Option is Option A

A.)It became prey to certain organisms in the river.

Explanation:

CHECK COMPLETE QUESTION BELOW;

An invasive fish species was accidentally introduced into a river. At first, it experienced a sudden surge in its population. Then it experienced a steady decline. Which statements give plausible reasons for this trend?

A.It became prey to certain organisms in the river.

B.It lacked adaptations suitable for that particular ecosystem.

C.It had no predators in its new environment.

D.It had few organisms to compete with for resources.

Aquatic invasive species are species such as fish or invertebrate that is absorbed by new aquatic environment that are differ from their own natural environment.

When Aquatic invasive species found themselves in a new environment, at first they will experience a rapid increase in the number of their population this is because of the lack of natural predators in the new aquatic environment. As a result of this they bring about the alteration of food web structure, they take in charge of available food for the native species and compete with them. As a result of this competition involved there is a decrease in the population.

Therefore, the statements that gives plausible reasons for this trend is that became prey to certain organisms in the river.

Answer:

It became prey to certain organisms in the river.

It lacked adaptations suitable for that particular ecosystem.

Explanation:

Took the test on Edmentum

12.5 mmol/L is the molar concentration of the sample having 0.5 M solution dissolved in water.

To answer this question, we need to calculate the molar concentration of the sample.
First, we need to find the amount of ammonium in the 500 mL of the 0.5 m solution.

We can calculate this by multiplying the molarity by the volume, which gives us 500 mL x 0.5 mol/L = 250 mmol.
Now, to find the molarity of the 20 mL sample, we need to divide the amount of ammonium by the volume of the sample: 250 mmol / 20 mL = 12.5 mmol/L.

Therefore, the molar concentration of the sample is 12.5 mmol/L.

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Ammonia is converted to nitrite, then to nitrate, and you'd like me to include the terms A) Nitrification, B) Denitrification, C) Assimilation, D) Ammonification, and E) Nitrogen fixation in my answer.

The process where ammonia is converted to nitrite and then to nitrate is known as

A) Nitrification. During nitrification, ammonia-oxidizing bacteria convert ammonia to nitrite (NO2-), and nitrite-oxidizing bacteria further convert nitrite to nitrate (NO3-).

B) Denitrification is the process where nitrate is reduced to nitrogen gas (N2) by denitrifying bacteria, releasing it back into the atmosphere.

C) Assimilation is the process where plants take up nitrogen in the form of nitrate or ammonium ions from the soil and incorporate it into their tissues.

D) Ammonification is the process where organic nitrogen compounds (such as proteins and nucleic acids) in dead organisms and waste products are converted to ammonia (NH3) or ammonium ions (NH4+) by decomposer microorganisms.

E) Nitrogen fixation is the process where nitrogen gas (N2) from the atmosphere is converted into ammonia (NH3) or other biologically available forms of nitrogen, primarily by nitrogen-fixing bacteria and archaea.

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The nuclear equation for the formation of titanium-48 from a radiosotope emitting a positron is: Radiosotope → Titanium-48 + Positron.

To express the formation of titanium-48 from a radiosotope emitting a positron, we can write the nuclear equation as follows:

Reactant Nucleus: Radiosotope

Product Nucleus: Titanium-48

Particle Emitted: Positron

The nuclear equation can be written as:

Radiosotope → Titanium-48 + Positron

This equation represents the decay of the radiosotope, where it emits a positron and forms titanium-48 as the product nucleus.

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The amount of concentrated solution needed is (0.286 M)(65 mL) / C M, and the amount of water needed is 65 mL minus the volume of the concentrated solution.

To calculate the molarity of Kool Aid desired, we need to determine the number of moles of Kool Aid powder and sugar in the package. Since the molecular formula for sugar is C12H22O11, we can calculate its molar mass as follows:

Molar mass of C12H22O11 = (12 * 12.01) + (22 * 1.01) + (11 * 16.00)

= 144.12 + 22.22 + 176.00

= 342.34 g/mol

Given that the package contains 4.25 grams of Kool Aid powder, we can calculate the number of moles of Kool Aid powder using its molar mass:

Number of moles of Kool Aid powder = Mass / Molar mass

= 4.25 g / 342.34 g/mol

≈ 0.0124 mol

Similarly, for the sugar, which has a molar mass of 342.34 g/mol, we can calculate the number of moles of sugar using its mass:

Number of moles of sugar = Mass / Molar mass

= 192.00 g / 342.34 g/mol

≈ 0.5612 mol

Now, to calculate the molarity of the desired Kool Aid solution, we need to determine the volume of water. Given that 1.06 quarts is equal to 1 liter, and we have 2.00 quarts of water, we can convert it to liters as follows:

Volume of water = 2.00 quarts * (1.06 liters / 1 quart)

= 2.12 liters

To find the molarity, we use the formula:

Molarity (M) = Number of moles / Volume (in liters)

Molarity of Kool Aid desired = (0.0124 mol + 0.5612 mol) / 2.12 L

≈ 0.286 M

To prepare 65 mL of the desired molarity, we can use dilution calculations. We need to determine the volume of concentrated solution and the volume of water needed.

Let's assume the concentration of the concentrated Kool Aid solution is C M. Using the dilution formula:

(C1)(V1) = (C2)(V2)where C1 is the initial concentration, V1 is the initial volume, C2 is the final concentration, and V2 is the final volume.

Given that C1 = C M and V1 = V mL, and we want to prepare a final volume of 65 mL (V2 = 65 mL) with a final concentration of 0.286 M (C2 = 0.286 M), we can rearrange the formula to solve for the volume of the concentrated solution:

(C M)(V mL) = (0.286 M)(65 mL)

V mL = (0.286 M)(65 mL) / C M

So, the amount of concentrated solution needed is (0.286 M)(65 mL) / C M, and the amount of water needed is 65 mL minus the volume of the concentrated solution.

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Adding one proton to the nucleus of an atom D) converts it to an atom of a different element.

The addition of a single proton to the nucleus of an atom can have a significant effect, transforming it from one element to another.

This is because protons are positively charged and act as the defining factor in the atomic number of an element.

Every element has a unique number of protons, and when the number is changed, the element changes as well. Therefore, adding a single proton to the nucleus of an atom will convert it to an atom of a different element.

This is because protons are the subatomic particles that determine the identity of an element. When you add a proton to the nucleus, you are changing the element's identity and thus creating a new element.

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Answer:

Two or more!

Explanation:

Okay, let's solve this step-by-step without using quadratics:

1) The equilibrium constant Kc = 0.36 means the equilibrium lies to the left. So there will be more N2O4 than NO2 at equilibrium.

2) The initial concentration of N2O4 is 0.1 mol dm^-3. Let's call this [N2O4]initial.

3) At equilibrium, the concentrations of N2O4 and NO2 will be [N2O4]equil and [NO2]equil respectively.

4) We know the equilibrium constant expression for this reaction is:

Kc = ([NO2]equil)^2 / [N2O4]equil

5) Setting this equal to 0.36 and plugging in 0.1 for [N2O4]initial, we get:

0.36 = ([NO2]equil)^2 / (0.1 - [NO2]equil)

6) Simplifying, we get:

0.036 = [NO2]equil^2

7) Taking the square root of both sides, we get:

[NO2]equil = 0.06 mol dm^-3

So the equilibrium concentration of NO2 is 0.06 mol dm^-3.

Let me know if you have any other questions! I can also provide a more step-by-step explanation if needed.

Answer:

a) In the presence of light silver nitrate decompose to form silver. hence to prevent the decomposition it is kept in dark coloured bottles.

b) Molybdenum is used in the manufacture of ammonium because molybdenum acts as a promoter which increases the efficiency of the catalyst Iron, resulting in better yield of ammonia.

c) When an iron nail immersed in the solution of copper sulphate than iron displaces copper from the solution of copper sulphate because iron is more reactive than copper. Therefore copper sulphate solution colour changes from blue to pale green.

The number of moles are equal to 4.0 × 10²⁵ atoms of tungsten is 0.6624 moles.

Mole is the amount of substance that contain the element chemical units present in 12 g of carbon - 12.

given that :

number of  present in atoms of tungsten =  4.0 × 10²⁵

1 mole contains = 6.022 × 10²³ atoms

therefore, 4.0 × 10²⁵ atom will contains :

number of moles = 4.0 × 10²⁵ / 6.022 × 10²³

number of moles = 0.6642 moles.

Thus, The number of moles are equal to 4.0 × 10²⁵ atoms of tungsten is 0.6624 moles.

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Answer:

Akash

Explanation:

it could be a magnet with the same poles facing eachoher

Answer:

A flame test is an analytic procedure used in chemistry to detect the presence of certain elements, primarily metal ions, based on each element's characteristic emission spectrum. The color of flames in general also depends on temperature; see flame color.

Explanation:

(not my answer, just the best worded)

The minimum resolution to separate these wavelengths is 250nm as they are located near 255n and 0.03nm.

Resolution also known as optical resolution or chiral resolution, or chiral activity refers to the activeness of the compound. It is the process in which two racemic mixtures are separated into its components.

    Wavelength is known as the distance between two repeated waves of light. Wavelength is denoted by the symbol lambda (λ). It gives us the idea of the speed or pace of a particular light.

    In the given condition, two absorption peaks - absorption spectroscopy is the absorption spectrum between which the light releases protons. Therefore, the wavelength to separate these two absorption peaks is 250nm in minimum.

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The ∆H when the 123.6 g octane that will undergoes the combustion to thermochemical equation is -250.40 kJ.

The Balanced chemical reaction:

2C₈H₁₈ (l) + 25O₂ (g) → 16CO₂ (g) + 18H₂O (l)

The mass of the octane, C₈H₁₈ = 123.6 g

The ΔH for the rxn  is as :

ΔHrxn = 16 ΔH°f (CO₂ (g)) + 18 ΔHf (H₂O (l))  -  (2 ΔHf (C₈H₁₈) (l) + 25 ΔHf O₂ (g))

-1.0940 × 10⁴ kJ = 16mol x (-393.5 kJ/mol) + 18mol x  (-285.8 kJ/mol) - 2(ΔHf(C₈H₁₈)(l) -1.094 x10⁴ kJ

= -6296 kJ + ( -5144.40 kJ ) - 2(ΔH°f(C₈H₁₈)(l)

-500.40 kJ/2 = ΔHf(C₈H₁₈)(l)

ΔHf(C₈H₁₈)(l) = -250.40 kJ

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Answer:

It should be the answer D. A type of atom

Explanation:

A model is a "synthetic coordination entity that closely approaches the properties of a metal ion in a protein"

An ion is a charged atom.

Answer:

cellular respiration

Explanation:

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c) The rates of the forward and reverse reactions are equal. When the forward and reverse processes move ahead and backward at the same pace, with no discernible change in the system, this is referred to as dynamic equilibrium for reversible processes.

Dynamic equilibrium occurs when, given a reversible process, the rate of the forward reaction equals the rate of the reverse reaction. Although it appears that nothing is happening because the two rates are equal, the reaction is actually continuing at its steady rate. The equilibrium state is one in which there is no net change in the concentrations of reactants and products. The opposite is true; at equilibrium, both forward and reverse reactions proceed at the same rate, maintaining the net concentrations of reactants and products as is.

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If ethanol was used to measure the density of the irregular objects, it would not have affected the results at all.

The volume of irregular objects is obtained by displacement method. A known volume of a liquid is measured out and added to a measuring cylinder.

The irregular solid is now added to the set up and the change in volume is noted. This change in volume corresponds to the volume of the object.

If the mass of the irregular object has been previously determined, the density of the object is:

Density = mass/volume

The kind of liquid (ethanol or water) used to determine the density does not affect the results.

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(a) K₂S: Each potassium atom donates one electron to sulfur, forming K⁺ and S₂⁻ ions, which then attract each other to form K₂S via electrostatic forces.

(b) Ca₃N₂: Each calcium atom donates two electrons to one nitrogen atom, forming Ca²⁺ and N³⁻ ions. Three nitrogen atoms then bond with two calcium ions each to form Ca³N².

(a) The Lewis structure of K₂S can be shown as follows:

K K

\ /

S²⁻

  K           K

   |            |    

S₂- + 2 K+ → K₂S

The sulfur atom gains two electrons from two potassium atoms to form S²⁻on while each potassium atom loses one electron to form K⁺ ion. The two K+ ions combine with the S²⁻ ion to form K₂S.

(b) \(Ca_3N_2\):

The Lewis structure for \(Ca_3N_2\) can be written as:

 :N≡C:

/      \  

Ca Ca

| |

Ca Ca

The electron transfer occurs as follows:

3 Ca + N₂ → Ca₃N₂

Each nitrogen atom shares its three valence electrons with three calcium atoms. Each calcium atom gives two electrons to the nitrogen atom to form the Ca₃N2 ionic compound.

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