a student prepares a solution by combining 100 ml of 0.30 m hno2(aq) and 100 ml of 0.30 m kno2(aq). which of the following equations represents the reaction that best helps to explain why adding a few drops of 1.0 m hcl(aq) does not significantly change the ph of the solution?
HNO2 + HâO NO + HâO k(aq) + Cl(aq) â KCl(s) HNO3(aq) - H*(aq) + NO, (aq) C H(aq) + OH (aq) â H20(1) H(aq) + NO2 (aq) â HNO2(aq)

Answer:

It helps to get a better grip on the money.

Explanation:

Effective nuclear charge increases as you move to the right across a row in the periodic table.

Effective nuclear charge is the nuclear charge that's felt by an electron due to the presence of other electrons in an atom.

Effective nuclear charge (Zeff) varies based on the number of protons in the nucleus and the shielding effect from inner electrons.

Option D is the correct statement that shows the increase in effective nuclear charge as you move to the right across a row in the periodic table.

The effective nuclear charge of an atom is proportional to its nuclear charge (Z) and the average amount of shielding electrons.

However, as we move to the right side of the periodic table, the number of protons in the nucleus increases, causing the electrons in the same energy level to experience a greater attractive force.

In the periodic table, the effective nuclear charge (Zeff) felt by the valence electrons of an atom rises as we go from left to right across a period.

This is caused by an increase in the nuclear charge, which means that the valence electrons are more tightly bound to the nucleus and are thus more difficult to remove.

The periodic table has been arranged in such a way that the elements are arranged in order of their atomic numbers. As a result, the elements are arranged in a pattern that is consistent with their properties.

Effective nuclear charge increases as you move to the right across a row in the periodic table.

As we go from left to right across the periodic table, the effective nuclear charge experienced by the valence electrons of an atom grows because the atomic number of the elements increases. As a result, effective nuclear charge increases as we move from left to right across a period.

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Answer:

if a reaction occurs in a gas phase, then it the pressure would affect the rate of reaction.

Answer:  A)If the reaction occurs in the gas phase

Explanation:

Answer:

It helps us to insure what will the current rate will be to those subject or nartual disaster can conquere

Answer

A) The concentration of nutrients decreases, which improves the water quality in the pond.

Explanation

Dilution is a way to decrease pollution, in this case, freshwater will contain a low amount of nutrients, dissolving those present in the pond and reducing the overall concentration. Fewer nutrients derive in less eutrophication and hence better water quality.

Answer:

250L

Explanation:

Data;

V1 = 200L

P1 = 10atm

T1 = 400K

T2 = 100K

P2 = 2atm

V2 = ?

To solve this question, we'll have to use the combined gas equation which is a combination of Boyle's law, Charles law and pressure law.

From combined gas equation,

(P1 × V1) / T1 = (P2 × V2) / T2

P1 × V1 × T2 = P2 × V2 × T1

Solve for V2,

V2 = (P1 × V1 × T2) / P2 × T1

V2 = (10 × 200 × 100) / (2 × 400)

V2 = 200,000 / 800

V2 = 250L

The final volume of the gas is 250L

To calculate which solution will have the smaller freezing-point depression between the two solutions, one with 100.0 g of methanol in 500.0 g of water and the other with 200.0 g of methanol in 500.0 g of water, we need to consider the concept of freezing point depression.

Freezing point depression is a phenomenon in which the freezing point of a solution is lower than that of the pure solvent. It depends on the concentration of the solute, in this case, methanol.

Solution 1: 100.0 g methanol in 500.0 g water
Solution 2: 200.0 g methanol in 500.0 g water

Comparing the two solutions, Solution 1 has a lower concentration of methanol than Solution 2. Therefore, Solution 1 will have a smaller freezing-point depression compared to Solution 2, since the freezing point depression is directly proportional to the concentration of the solute in the solution.

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Answer:

why do people add sugar to drinks to make them sweeter

Answer:

applied force .....I'm pretty sure

Answer:

A. Applied forces aka Contact forces

Explanation:

Thos force is created when you apply forces to an object as in a push/pull or other physical ways.

I hope it helps! Have a great day!

Anygays-

Explanation:

This is because the hydrogen bonding in water H2O is stronger than that is hydrogen sulfide H2S.

A galvanic anode that would NOT be used to provide CP to steel is:.D) Chromium is not commonly used as a galvanic anode for the cathodic protection (CP) of steel. Magnesium, aluminum, and zinc are commonly used galvanic anodes for the CP of steel.

A galvanic anode is a type of sacrificial anode that is used to protect metal structures from corrosion. It is made from a more active metal than the metal being protected, such as zinc, aluminum, or magnesium. When the anode is electrically connected to the metal being protected and immersed in an electrolyte, such as seawater, a galvanic cell is created. This results in the anode corroding instead of the protected metal. As the anode corrodes, it releases electrons that flow through the electrolyte to the metal being protected, preventing it from corroding. Galvanic anodes are commonly used in pipelines, ships, and offshore structures to prevent corrosion.

Galvanic anodes are commonly used as a form of cathodic protection (CP) to protect metallic structures from corrosion. The anode material is more reactive than the metal being protected, and when connected to the structure through a conductive medium, it corrodes preferentially to the protected metal, thereby providing CP.

Magnesium, aluminum, and zinc are all commonly used as galvanic anodes for CP because they are more reactive than steel and corrode preferentially to it. However, chromium is not typically used as a galvanic anode for CP because it is less reactive than steel and would not provide sufficient protection. Instead, chromium is often used as a passive protective coating on steel, as it forms a thin, stable oxide layer that helps to prevent corrosion.

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5.715 mL of 2.0 M HCl do you need to neutralize to reclaim your compound of isoleucine.

Isoleucine is therefore a monobasic compound.

The neutral species A is soluble in an organic layer, but the negatively charged species B is soluble in an aqueous layer.

Isoleucine has a molecular weight of 131.17 g/mol.

We consumed 1.5 gram of isoleucine.

hence, the number of moles of isoleucine consumed is 1.5/131.17, or 0.01143.

Hence, the same number of moles of NaOH, or 0.01143, are required to deprotonate isoleucine.

The molarity of the NaOH solution is now 2.5 M.

the required amount of NaOH is therefore

(0.01143 x \(\frac{1000}{ 2.5}\) mL)= 4.57 mL

Corresponding to that, 0.01143 moles of HCl are required to neutralise species B.

Now, we are aware that the HCl solution has a molarity of 2.0 M.

Hence, the amount of NaOH required is= (0.01143 x \(\frac{1000}{ 2.0}\) mL)= 5.715 mL

As it is a salt, (sodium bromide) cannot remove a proton from isoleucine.

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Answer:

Explanation: l m n o p q r s t u v w x y z

Answer: There are five signs of chemical change

When these signs start to form you know chemical change is at work.

Hope this helps :)

Answer:

I'm assuming you need to label above the lines. So, above the line where the  Cretaceous period ends is mass extinction and where the bracket lies is adaptive radiation.

Explanation:

Mass extinctions are periods of time where the organisms are essentially wiped out in an extremely brief period of time. You can see how the species just drops off. Adaptive radiation occurs when there is a diversification of a group of organisms as evident by the rise in the number of marine animal groups shown by the bracketed area.

Answer: Na

Explanation:

on the left it says Na, and on the right it says Na2

Answer:

exothermic i think beacuse thre is not photo

You have a graduated cylinder with 20 ml. of water in it. You add 25 g of lead weights, and the volume rises to 42 ml.  the density of lead is 1.13 g/mL.

given data :

mass = 25 g

initial volume , V1 = 20 mL

final volume , V2 = 42 mL

volume = V2 - V1 = 42 mL - 20 mL

volume = 22 mL

density is given as :

Density = mass / volume

density = 25 g / 22 mL

density = 1.13 g/mL

Thus, You have a graduated cylinder with 20 ml. of water in it. You add 25 g of lead weights, and the volume rises to 42 ml.  the density of lead is 1.13 g/mL.

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The molar concentration of a 12% sodium chloride solution is approximately 2.05 M.

To determine the molar concentration of a 12% sodium chloride solution, we need to convert the given percentage concentration into molarity.

First, we need to understand that the percentage concentration refers to the mass of the solute (sodium chloride) relative to the total mass of the solution.

In this case, a 12% sodium chloride solution means that there are 12 grams of sodium chloride in 100 grams of the solution.

To convert this into molar concentration, we need to consider the molar mass of sodium chloride, which is 58.5 g/mol.

We can start by calculating the number of moles of sodium chloride in 12 grams:

Moles of sodium chloride = mass of sodium chloride / molar mass of sodium chloride

Moles of sodium chloride = 12 g / 58.5 g/mol = 0.205 moles

Next, we calculate the volume of the solution in liters using the density of the solution. Since the density is not provided, we assume a density of 1 g/mL for simplicity:

Volume of solution = mass of solution / density

Volume of solution = 100 g / 1 g/mL = 100 mL = 0.1 L

Finally, we calculate the molar concentration (Molarity) by dividing the number of moles by the volume in liters:

Molar concentration = moles of solute / volume of solution

Molar concentration = 0.205 moles / 0.1 L = 2.05 M

Therefore, the molar concentration of a 12% sodium chloride solution is approximately 2.05 M.


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Out of the given options, increasing the volume at constant temperature will not cause an increase in the rate of the bimolecular gas-phase reaction.

This is because the rate of the reaction depends on the concentration of reactant molecules. When the volume is increased at constant temperature, the concentration of reactant molecules decreases as they are more spread out over a larger volume. As a result, the rate of the reaction decreases.

On the other hand, adding a catalyst or increasing the temperature at constant volume will increase the rate of the reaction. A catalyst provides an alternative pathway for the reaction with a lower activation energy, making it easier for the reactant molecules to react.

This leads to an increase in the rate of the reaction. Similarly, increasing the temperature increases the kinetic energy of the reactant molecules, leading to more collisions and therefore, an increased rate of reaction.

Overall, it is important to consider the effect of changing conditions on the concentration of reactant molecules when predicting the rate of a reaction.

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The probable question may be:

consider a bimolecular reaction in the gas phase. which one of the following changes in condition will not cause an increase in the rate of the reaction?

add a catalyst increase the temperature at constant volume Increase the volume at constant temperature All of the above will increase the rate of reaction

Answer:

Kinetic energy is transferred from the leg to the ball

Explanation:

Before kicking the ball, you'll need to run to where the position of the ball is which implies that your leg is not at rest, immediately you kick the ball, you will be transferring the kinetic energy of your leg to the ball.

Kinetic energy is transferred from the leg to the soccer ball.

Kinetic energy is the strength of the movement, observable as the movement of an item, particle, or set of debris. Any item in movement is the usage of kinetic energy: someone taking walks, a thrown baseball, a crumb falling from a table, and a charged particle in an electric-powered field are all examples of kinetic electricity at work.

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The conformation of a polypeptide's backbone is described by the angles of rotation about the peptide bonds.

The most common type of conformation is an alpha helix, in which the peptide bond rotates at an angle of approximately 100 to 120 degrees in a clockwise direction. This arrangement of the peptide bond contributes to an increase in the stability of the polypeptide, as the bonds form hydrogen bonds between the amino acids. This arrangement also allows for more efficient folding of the polypeptide, allowing for better functionality of the proteins involved. To calculate the angle of rotation for a given polypeptide, the bond length, bond angle, and torsional angle must all be known. First, the bond length must be determined from the x-ray data.

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Answer:

A)Trial 1 because the average rate of reaction is lower.

Explanation:

I accidentally gave myself low rating my bad

The statement that best explain which trial has a lower concentration of the reactants is Trial 1, because this reaction lasted for a longer duration than Trial 2.

Chemical reaction refers to reaction that take place between reacting substances in which the chemical substances are transformed to products.

When the concentration of the reactants increases, more molecules tend to interact with each other in order to form new compounds, and the rate of reaction increases. When the concentration of the reactants reduces, there are little of that molecule present, and the rate of reaction decreases

Therefore, The statement that best explain which trial has a lower concentration of the reactants is Trial 1, because this reaction lasted for a longer duration than Trial 2.

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Answer:

i think right artrium but not full aure

Answer:

It's b

Explanation:

I had the same exact question

For this question, we are going to use two formulas to find the energy, the first one is already described in the question itself, which is:

E = h*f

Where:

E = energy

h = planck's constant, 6.63*10^-34

f = frequency, which we have to find

And the next formula will be:

f = c/λ

Where:

f = frequency

c = speed of light, 3.00*10^8 m/s

λ = wavelenght, 510 nm

Now let's solve the frequency formula first:

f = 3.00*10^8/510*10^-9

f = 5.88*10^14

Now we use this value of frequency to find the energy

E = 6.63*10^-34 * 5.88*10^14

E = 3.9*10^-19 J