in a 0.050 m solution of a weak acid h3o =1.8x10-3 what is ka

Answer:

B has highest stability

Explanation:

as its octet is complete

plz mark brainliest if it helps

Answer:Atoms seek to be stable; so, to get to a more stable state, the atom expels energy from the nucleus in the form of a particle or ray. This process is known as radioactivity, the unstable atom is said to be a radioactive atom, and the energy that's released is radiation

Explanation: so B

The standard reaction enthalpy for the given reaction is +235.8 kJ/mol.

The standard reaction enthalpy (ΔH°) for the given reaction is determined as follows:

Equation of reaction: 3 Fe₂O₃ (s) → 2 Fe₃O₄ (s) + ½ O₂ (g)

The standard enthalpy of formation values for Fe₂O₃ (s), Fe₃O₄(s), and O₂(g) is used to calculate the standard reaction enthalpy.

ΔH° = [2 × ΔH°f(Fe₂O₃)] + [½ × ΔH°f(O₂)] - [3 × ΔH°f(Fe₃O₄)]

where;

ΔH°f(Fe₂O₃) = -824.2 kJ/mol

ΔH°f(Fe₃O₄) = -1118.4 kJ/mol

ΔH°f(O₂) = 0 kJ/mol

ΔH° = [2 × (-1118.4 kJ/mol)] + [½ × 0 kJ/mol] - [3 × (-824.2 kJ/mol)]

ΔH° = -2236.8 kJ/mol + 0 kJ/mol + 2472.6 kJ/mol

ΔH° = 235.8 kJ/mol

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Among the given elements, S and Sr forms ionic compound. Sr metal donate electron to sulfur forming ionic compound.

Ionic compounds are formed between metals and non metals. The metals are electropositive elements. They easily loss electrons in chemical bonding.

Strontium is an alkaline earth metal with two valence electrons. Strontium forms ionic compounds with non-metals by donating its two valence electrons.

Sulfur needs two more electrons to achieve octet. Hence, it easily gain two electrons from strontium metal forming the ionic compound SrS.

Hence, option c is correct.

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The electron geometry (eg) and molecular geometry (mg) of CH\(_{3} ^{+1}\) is eg=tetrahedral, mg=tetrahedral. The correct answer is A)

To determine the electron geometry (eg) and molecular geometry (mg) of CH\(_{3} ^{+1}\), we need to first draw the Lewis structure of the molecule.

The Lewis structure of CH\(_{3} ^{+1}\) has one carbon atom at the center with three hydrogen atoms attached to it and a positive charge on the molecule.

Carbon has four valence electrons and each hydrogen has one valence electron. Therefore, the total number of valence electrons in CH\(_{3} ^{+1}\) is 2 (from the positive charge) + 4 (from carbon) + 3 (from each hydrogen) = 10.

To form the Lewis structure, we first place the carbon atom in the center and attach the three hydrogen atoms to it. Each hydrogen atom will share one electron with the carbon atom to form a single bond.

Carbon will have four electron pairs around it, which gives us the electron geometry of tetrahedral.

Next, we need to determine the molecular geometry of CH\(_{3} ^{+1}\). The molecular geometry takes into account the lone pairs and bond pairs of electrons around the central atom. In CH\(_{3} ^{+1}\), there are no lone pairs of electrons, only bond pairs.

Since the four bond pairs of electrons are spread out equally in a tetrahedral arrangement, the molecular geometry of CH\(_{3} ^{+1}\) is also tetrahedral. Therefore, the correct answer is A) eg=tetrahedral, mg=tetrahedral.

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Answer:

option B . because acording to Newton 1st law until or unless you donot  apply force the object will not move or stops.

Explanation:

Answer:

Mercury is an liquid metal

Explanation:

Mercury is a chemical element with the symbol Hg and atomic number 80. It is commonly known as quicksilver and was formerly named hydrargyrum.

Symbol: Hg

The magnitude of Δ for this complex is 2.40 x 10^4 kJ/mol.

We can use the relation between energy (E) and frequency (v) of light:

E = h*v

where h is the Planck's constant.

The frequency of light can be related to its wavelength (λ) and speed of light (c) as:

v = c/λ

where c is the speed of light.

We know that the absorption maximum for the d-d transition in \([Ti(H_2O)_6]^{3+}\)occurs at a wavelength of 500 nm. Therefore, the frequency of the absorbed light is:

v = c/λ = (3.00 x 10^8 m/s) / (500 x 10^-9 m) = 6.00 x 10^14 Hz

The energy of the absorbed light can be calculated using the first equation:

E = hv = (6.626 x 10^-34 Js) * (6.00 x 10^14 Hz) = 3.98 x 10^-19 J

We can convert this energy to kilojoules per mole using the Avogadro's number:

3.98 x 10^-19 J * (6.02 x 10^23 mol^-1) / 1000 J kJ^-1 = 2.40 x 10^4 kJ mol^-1

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The magnitude of DELTA for the d-d transition in [Ti(H2O)6]3+(aq) is 26.4 kJ/mol. To calculate DELTA, we first need to calculate the frequency of the absorbed light

To calculate DELTA, we first need to calculate the frequency of the absorbed light using the formula E = hν, where E is the energy of the absorbed light, h is Planck's constant, and ν is the frequency of the light.

We can then use the formula c = λν, where c is the speed of light and λ is the wavelength of the absorbed light, to calculate the frequency. The wavelength of the absorbed light is given as 500 nm. Using these equations, we can calculate the frequency of the absorbed light to be 6.0 x 10^14 s^-1.

Next, we use the equation DELTA = hc/λ, where h is Planck's constant, c is the speed of light, and λ is the wavelength of the absorbed light, to calculate DELTA.

Substituting the values into the equation, we get DELTA = (6.626 x 10^-34 J s)(3.00 x 10^8 m/s)/(500 x 10^-9 m) = 39.8 x 10^-20 J. Converting the result to kJ/mol using Avogadro's number, we get 26.4 kJ/mol.

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Answer:

Listed below

Explanation:

COMPOUND

1. It is a pure substance.

2. It can not be separated by a physical method.

3. Element loses their properties in a compound.

4. Its composition is fixed throughout its mass.

5. It has a fixed melting point.

6.In nature they are homogeneous.

MIXTURE

1. It is an impure substance.

2. It can be separated by a physical method.

3. Substances forming mixture retain their properties.

4. It has no fixed composition.

5. It has no sharp melting point.

6. They can be homogeneous as well as heterogeneous in nature.

We observe the same pattern as Ionic compounds are formed by electrically neutral cation-anion pairs. Ionic bonds hold together ionic compounds. They are named with the cation name first, then the anion name, with the word "ion" omitted.

The charge on cations is positive. They are made of metals on the periodic table's left side. The primary group of metals (Groups 1–8) form cations with a single, fixed charge. The charge corresponds to the periodic table's Group (column) number. After the element name, add the word "ion" to form the cation name.

Anions are charged negatively. They are composed of nonmetals, which are found on the periodic table's right side. Using the Octet Rule, the negative charge is found to be eight (8) minus the Group number. Anions have a single, fixed charge at all times. By changing the element name suffix to "-ide" and adding the word "ion" after the element name, the anion name is formed.

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Answer: The bus traveling 200km in 6 hours is traveling the fastest.

Explanation:

Bus 1

150km/5hrs

Simplify -> 30km/hr

Bus 2

200km/6hrs

Simplify -> About 33.333km/hr

Answer:

sonic boom

To calculate the percentage of silica in the sandstone rock, we need to first calculate the mass of silica in the sample. We can use the Law of Conservation of Mass to do this. The equation for this law is mass of reactants = mass of products.

In this case, the reactants are 19.5 mg of the sandstone rock and 3.95 mg of carbon dioxide. So the mass of silica in the sample is 19.5 - 3.95 = 15.55 mg.

To calculate the percentage of silica in the rock, we need to divide the mass of silica (15.55 mg) by the total mass of the sample (19.5 mg) and then multiply that by 100. So the percentage of silica in the rock is 15.55/19.5 * 100 = 79.87%.

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Answer:

162.7miles/hr

Explanation:

Given parameters:

Distance covered by the train  = 813.5miles

Time taken  = 5hours

Unknown:

Speed of the train  = ?

Solution:

Speed is a physical quantity.

It is mathematically expressed as;

      Speed  = \(\frac{distance}{time}\)

So, input parameters and solve;

   Speed  = \(\frac{813.5}{5}\)  = 162.7miles/hr

Dependent variables are those that need a stimulus to present themselves. The independent variables are those that do not need a stimulus to present themselves and the control variables are the elements that remain unchanged throughout the experiment.

To increase the understanding of these variables, we can use as an example an experiment that seeks to evaluate the influence of root growth of transgenic corn with water stress. In this experiment, five plants of transgenic corn will suffer different levels of water stress, while one plant of the same corn will not suffer this stress and will be watered normally.

According to this, root growth is a variable that needs a stimulus to present itself, so this is the dependent variable. Water stress does not need any stimulus, being the independent variable. Finally, the corn plant that will not suffer any type of stress will remain unchanged throughout the experiment, being the control variable.

You didn't show the experiments your question refers to, which prevents me from providing an exact answer, but I hope the information above can help you.

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Answer:

Dependent variables are those that need a stimulus to present themselves. The independent variables are those that do not need a stimulus to present themselves and the control variables are the elements that remain unchanged throughout the experiment.

Importance of variables

They present the relationship between the elements of the experiment.

Allow hypotheses to be tested.

Allows comparisons between experimental treatments.

They encourage the evaluation of experimental data.

To increase the understanding of these variables, we can use as an example an experiment that seeks to evaluate the influence of root growth of transgenic corn with water stress. In this experiment, five plants of transgenic corn will suffer different levels of water stress, while one plant of the same corn will not suffer this stress and will be watered normally.

According to this, root growth is a variable that needs a stimulus to present itself, so this is the dependent variable. Water stress does not need any stimulus, being the independent variable. Finally, the corn plant that will not suffer any type of stress will remain unchanged throughout the experiment, being the control variable.

You didn't show the experiments your question refers to, which prevents me from providing an exact answer, but I hope the information above can help you.

Explanation:

The evidence that indicated that the map made near Lake Tapps in Washington was a massive lahar from Mt. Rainier and not an old glacier: Whole logs mixed in with the rocks, Clay-sized particles and An abundance of snow and ice

The following evidence indicated that the map made near Lake Tapps in Washington was a massive lahar from Mt. Rainier and not an old glacier:

Whole logs mixed in with the rocks: The presence of whole logs mixed in with the rocks suggests a rapid and powerful flow, characteristic of a lahar, rather than the slow movement associated with glaciers.

Clay-sized particles: The presence of clay-sized particles is often associated with lahars, as they can be easily transported by the flowing volcanic material.

An abundance of snow and ice: The presence of snow and ice is indicative of a recent event, as glaciers tend to accumulate and retain snow and ice over time. In the case of a lahar, the presence of snow and ice suggests a more recent deposition.

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The speed of sound is 343 m/s. If you heard the thunder 2 s after seeing the lightning:

To determine how far away the lightning was when you saw the flash and heard the thunderclap 2 seconds later, we'll use the speed of sound and the time it took for the sound to reach you.

The speed of sound is given as 343 m/s, and the time taken is 2 seconds.
Step 1: Multiply the speed of sound by the time taken.
Distance = Speed × Time
Distance = 343 m/s × 2 s

Step 2: Calculate the distance.
Distance = 686 meters

So, the lightning was 686 meters away from you when you saw the flash and heard the thunderclap 2 seconds later.

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You see a distant flash of lightning, and then you hear a thunderclap 2 s later. the sound of the thunder moves at 343 m/s. The lightning was 686 meters away from you.

When you see a distant flash of lightning, the light reaches your eyes almost instantaneously because light travels at a very high speed. However, sound travels much slower than light, and it takes some time for the sound waves to reach your ears. By measuring the time delay between seeing the lightning and hearing the thunder, you can estimate the distance between you and the lightning strike.

To calculate the distance to the lightning, we can use the fact that sound travels at a constant speed of 343 m/s. The time it takes for the sound of the thunder to reach you is 2 seconds. So:
Distance = Speed x Time
Distance = 343 m/s x 2 s
Distance = 686 meters
Therefore, the lightning was approximately 686 meters away from you.

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Agarose gel electrophoresis differs from SDS-PAGE in all of the following ways except  loading buffer which generally gives the sample a uniform negative charge. As a result, choice A is the best one.

By determining their size and charge, small molecules (DNA, RNA, protein, etc.) or their fragments can be separated and analysed using the gel electrophoresis technique. Biochemistry as well as molecular biology use it to distinguish between a mixture of fragments of DNA and RNA by length, to determine the size of DNA as well as RNA fragments, or to separate amino acids by charge. Clinical chemistry uses it to separate amino acids by charge and size (IEF agarose, basically size independent). Its loading buffer typically imparts a homogeneous negative charge to the sample.

Therefore, the correct option is option A.

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A molecule having four total electron groups around the central atom has three bonding electron groups and one nonbonding electron group. Its molecular structure is trigonal pyramidal.

One or more atoms are joined by covalent (chemical) bonds to form molecules. Atoms can be represented as circles with a nucleus at their center (consisting of protons and neutrons) and one or more concentric circles around them, which represent the "shells" or "levels" in which the electrons surrounding the atom's nucleus are located, along with markings indicating the electron at each level. The lowest unit into which a substance can be divided while still being the same substance is a molecule. It is composed of two or more atoms that are chemically bonded to one another.

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The pH of a 2.45 x 10^-3 M sulfuric acid solution is 2.61.

The pH of a solution can be calculated using the formula:

pH = -log[H+]

where [H+] represents the concentration of hydrogen ions in the solution.

For a strong acid like sulfuric acid (H2SO4), it is completely dissociated in water, meaning all of its molecules will release their hydrogen ions (H+) into the solution. Therefore, the concentration of hydrogen ions in the solution will be equal to the concentration of sulfuric acid.

In this case, the concentration of sulfuric acid is 2.45 x 10^-3 M. Therefore, the concentration of hydrogen ions is also 2.45 x 10^-3 M.

Now we can calculate the pH using the above formula:

pH = -log[H+]

= -log(2.45 x 10^-3)

= 2.61

Therefore, the pH of a 2.45 x 10^-3 M sulfuric acid solution is 2.61.

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The concentration of Ni(H2O)62+ ions at equilibrium in the solution formed is 0.00153 M.

The expression for the dissociation constant to determine the concentration of Ni(H2O)62+ ions at equilibrium in the solution formed in Part 1 is: Kd = [Ni(H2O)62+] / ([Ni(H2O)62+] + [Ni(NH3)62+])

In this equation, [Ni(H2O)62+] represents the concentration of hydrated nickel(II) ions, and [Ni(NH3)62+] represents the concentration of complexed nickel(II) ions with ammonia ligands.

To calculate the concentration of Ni(H2O)62+ ions at equilibrium in the solution, we need to consider the stoichiometry of the reaction and the values given.

From the stoichiometry of the equation, we know that 1 mole of Ni(NO3)2 yields 1 mole of Ni(H2O)62+ ions. Given that there are 0.00153 mol of Ni(NO3)2, the concentration of Ni(H2O)62+ ions is also 0.00153 M.

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First what type of bond the element forms?

How much?

So

Answer is Ge

Based on the information Claim 2 is correct. Two samples have same properties. Therefore, they are the same substance. However, one sample has a different set of properties. Therefore, this sample is different Substance.

Substances represented by these models:

Acetone, acetic acid, formaldehyde

Yes. The evidence from the sim support the claim.

Following evidence support the claim:

(1) Structural similarities

(2) Arrangement of carbon and oxygen atoms.

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The sequence list of the smallest group of organisms to the largest group include molecule, cell, tissue, organ, organ system, organism, population, community, ecosystem, biosphere.

The levels of organization of organisms includes the general make of an organism from the smallest functional unit which is the cell to the largest.

The organisation of an organism from the smallest to the largest include the following:

molecule (the smallest part of a cell that bears it's characteristics) -->

cell (the cell is the structural and functional unit of a living organism)

--> tissue (this is made up of similar cells that carry out specific functions)

--> organ ( this is made up of similar tissues that carry out specific functions)

--> organ system( this is made up of similar organs that carry out specific functions)

--> organism--> population --> community --> ecosystem --> biosphere.

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the answer is:

40 g/mole

The ∆s°rxn for the given reaction is -112.3 J/mol⋅K.

To calculate ∆s°rxn for the given reaction, we need to use the following formula:
∆s°rxn = Σs°(products) - Σs°(reactants)
Here, the reactants are C2H2(g) and H2(g), and the product is C2H4(g). The values of s° for each species are given as follows:
s°(C2H2) = 200.9 J/mol⋅K
s°(H2) = 130.7 J/mol⋅K
s°(C2H4) = 219.3 J/mol⋅K
Now, we can substitute these values into the formula and get:
∆s°rxn = [s°(C2H4)] - [s°(C2H2) + s°(H2)]
∆s°rxn = [219.3] - [200.9 + 130.7]
∆s°rxn = [219.3] - [331.6]
∆s°rxn = -112.3 J/mol⋅K

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A factor that might affect the speed of reaction of the water in Blood Falls is the concentration of iron in the water.

Blood Falls is located in the McMurdo Dry Valleys of Antarctica, where a subglacial lake with a high concentration of iron mixes with oxygenated seawater to create the characteristic reddish color of Blood Falls.

The speed of this reaction may be influenced by the amount of iron present in the water, as well as the availability of oxygen to react with the iron. If the concentration of iron is high, the reaction may proceed more quickly than if the concentration is lower.

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