How many grams of K2SO4 should be used to prepare 2. 25 L of a 0. 400 M solution

The molarity of KMnO4 in the given solution is approximately 0.00126 M. Molarity is a measure of the concentration of a solute in a solution. It represents the number of moles of the solute present per liter of the solution.

To determine the molarity of KMnO4 in the given solution, we need to first calculate the number of moles of KMnO4 using its mass and molar mass, and then divide it by the volume of the solution.

The molar mass of KMnO4 can be calculated as follows:

(1 × atomic mass of potassium) + (1 × atomic mass of manganese) + (4 × atomic mass of oxygen)

= (1 × 39.10 g/mol) + (1 × 54.94 g/mol) + (4 × 16.00 g/mol)

= 39.10 g/mol + 54.94 g/mol + 64.00 g/mol

= 158.04 g/mol

Now, let's calculate the number of moles of KMnO4:

Number of moles = Mass / Molar mass

Number of moles = 0.0897 g / 158.04 g/mol

Number of moles ≈ 0.000567 mol

Next, we need to calculate the molarity using the number of moles and the volume of the solution:

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

Molarity = 0.000567 mol / 0.450 L

Molarity ≈ 0.00126 M

In this case, the molarity tells us the concentration of KMnO4 in moles per liter.

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The mass number is the atomic mass rounded to a whole number.

The mass number, can be regarded as the atomic mass number or nucleon number, which can be seen as the total number of protons  as well as neutrons in an atomic nucleus however if it is  approximated , it can be considered to be equal to the atomic mass of the atom expressed in atomic mass units.

It should be noted that the mass number is established by rounding the atomic weight to the nearest whole number.

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Answer:

C) H+(aq) + OH-(aq) ---》 H2O(aq)

Answer:

the answer is the 2 nd one ok

Answer:

Did you find the answer for this?

Explanation:

I am doing the test right now

The atom that contains exactly two unpaired electrons is option (A) S.

The atom that contains only one electron in the highest occupied energy sublevel is Ga. option (B).

The electronic configuration of sulfur is 1s2 2s2 2p6 3s2 3p4. The p subshell can accommodate a maximum of 6 electrons but here it holds 4 electrons which means that sulfur has 2 unpaired electrons. both located in the p-subshell. Sulfur will have a pair of electrons in the 1st 3p orbital, 1 electron in the 2nd 3p orbital and 1 electron in the 3rd 3p orbital.

Gallium is a alkali metal. The highest occupied energy sub-level is defined as number of electrons present in the outermost energy level of an atom. for alkali metals general electronic configuration is nS1. This means that in the highest occupied energy sub-level of an alkali metal there will be only one electron. so Ga has only one electron in the highest occupied energy sub level.

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Taking into account the definition of calorimetry and sensible heat, the heat added to the system is 331.2 cal.

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).

So, the equation that allows to calculate heat exchanges is:

Q = c× m× ΔT

where:

In this way, between heat and temperature there is a direct proportional relationship.

In this case, you know:

Replacing in the expression to calculate heat exchanges:

Q= 0.23 \(\frac{cal}{gC}\)× 24 g× 60 C

Solving:

Q= 331.2 cal

In summary, the heat added to the system is 331.2 cal.

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Answer:

organisms in rain water and the number of organisms in pond water because the dependant variable never changes

Explanation:

because the dependant variable never changes

The changes can be 1- Increase the sample size

                                  2-Repeat the experiment multiple times

                                  3-Use more precise measuring instruments

                                  4-Control environmental factors

                                  5-Conduct a calibration check

To improve the results of the experiment, several changes could be made:

1-Increase the sample size: Conducting the experiment with a larger sample size would provide more data points and reduce the impact of random errors. This would improve the accuracy and reliability of the results.

2-Repeat the experiment multiple times: Performing the experiment multiple times and calculating the average value would help minimize any systematic errors and provide a more representative result.

3-Use more precise measuring instruments: Utilizing more accurate and precise measuring instruments, such as calibrated digital balances or volumetric equipment, would reduce measurement errors and improve the precision of the results.

4-Control environmental factors: Ensure consistent environmental conditions throughout the experiment, such as temperature and humidity, to minimize their influence on the results.

5-Conduct a calibration check: Before starting the experiment, verify the accuracy of the instruments used by performing calibration checks. This would ensure that the measurements are reliable and accurate.

By implementing these changes, the experiment would yield more reliable and precise results, reducing the impact of errors and increasing the confidence in the data obtained.

Suppose that you were to carry out this experiment a second time. Considering thia answer to part F, this are the changes could you make to get better results.

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The amount of heat needed to increase the temperature of a metal's unit mass by one degree is known as its specific heat.

Thus, It is a measurement of the thermal energy storage capacity of the metal molecules at the molecular level and specific heat.

The atomic structure of the metal, its atomic weight, temperature, phase, and impurities are only a few of the variables that have an impact on this number and Specific heat.

Every metal has a different specific heat. It is possible for metals with the same elemental structure to have varying values. The atomic structure, mass, temperature, and presence of impurities in the metal, among other things, all have an impact on the specific heat value in specific heat.

Thus, The amount of heat needed to increase the temperature of a metal's unit mass by one degree is known as its specific heat.

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Answer:

\(\huge\boxed{\sf Atom}\)

Explanation:

Atom:

Element:

\(\rule[225]{225}{2}\)

The concentration of Ca(OH)2 in the solution is approximately 1.33 x 10^(-6) M.

To find the concentration of Ca(OH)2 in a solution with a pH of 8.57, we need to use the concept of pOH, which is the negative logarithm of the hydroxide ion concentration ([OH-]). The pOH can be calculated by subtracting the pH from 14, which gives us 14 - 8.57 = 5.43.

Since Ca(OH)2 produces two OH- ions for every molecule of Ca(OH)2 that dissolves, the concentration of OH- ions will be twice the concentration of Ca(OH)2. Thus, we have [OH-] = 2x, where x represents the concentration of Ca(OH)2.

Taking the antilogarithm of the pOH, we find that [OH-] = 10^(-pOH) = 10^(-5.43).

Since [OH-] = 2x, we can write 2x = 10^(-5.43) and solve for x.

x = (10^(-5.43))/2 ≈ 1.33 x 10^(-6) M

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The molality of the solution is approximately 1.55 m. Therefore, the correct answer is A) 1.55 m.

To find the molality (m) of the solution, we need to determine the number of moles of the solute (propyl alcohol) and the mass of the solvent (water).

Given:

Mass of propyl alcohol (solute) = 35.0 g

Mass of water (solvent) = 200 g

Step 1: Convert the mass of propyl alcohol to moles.

First, we need to calculate the molar mass of propyl alcohol (C3H7OH):

C = 12.01 g/mol, H = 1.008 g/mol, O = 16.00 g/mol

Molar mass of propyl alcohol = (3 * 12.01 g/mol) + (8 * 1.008 g/mol) + 16.00 g/mol = 60.12 g/mol

Now, we can calculate the number of moles of propyl alcohol:

Number of moles of propyl alcohol = Mass of propyl alcohol / Molar mass of propyl alcohol

= 35.0 g / 60.12 g/mol

Step 2: Calculate the molality.

Molality (m) is defined as the number of moles of solute per kilogram of solvent.

Mass of water (in kg) = Mass of water (g) / 1000

Now we can calculate the molality:

Molality (m) = Number of moles of propyl alcohol / Mass of water (in kg)

= (35.0 g / 60.12 g/mol) / (200 g / 1000)

Simplifying the expression, we get:

Molality (m) = (35.0 g * 1000) / (60.12 g/mol * 200 g)

= 1.55 m (rounded to two decimal places)

Option A

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Answer:3.381 X 10^(-11)

Explanation:

The formula for buoyant force is F = -Volume*density*gravitational acceleration. Convert volume and density to SI units and then apply them in the formula where gravitational acceleration is 9.8m/s^2. Done

Answer:

The liquid state sometimes is described simply as the state that occurs between the solid and gaseous states. Some examples of liquids are:

- Water

- Milk

- Vinegar

Unlike a liquid, a solid object does not flow to take on the shape of its container, nor does it expand to fill the entire available volume like a gas. Some examples of solids are:

- Rocks

- Brick

- Coin

What distinguishes a gas from liquids and solids is the vast separation of the individual gas particles. This separation usually makes a colorless gas invisible to the human observer. Some examples of gases are:

- Helium

- Oxygen

- Neon

Most organic compounds contain carbon and hydrogen.The term organic means of, relating to, or derived from living matter. Organic compounds are carbon-containing molecules that form the basis of living organisms. These compounds contain covalent bonds and are usually insoluble in water.

Most organic compounds contain carbon and hydrogen, but they can also contain other elements like oxygen, nitrogen, sulfur, and phosphorus. Some organic compounds include carbohydrates, proteins, lipids, and nucleic acids. These compounds are essential to life and make up the cells, tissues, and organs of living organisms.

The importance of organic compounds cannot be overstated, as they are involved in a wide variety of biological processes. For example, carbohydrates are a source of energy for the body, while proteins are involved in cellular repair and maintenance. Lipids form the membranes that surround cells, and nucleic acids contain the genetic information that is passed down from one generation to the next.

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Answer:  yes, Air is a homogeneous mixture of the gaseous substances nitrogen, oxygen, and smaller amounts of other substances. Salt, sugar, and substances dissolve in water to form homogeneous mixtures. A homogeneous mixture in which there is both a solute and solvent present is also a solution

Explanation:

The buffer solution that will have the greatest buffer capacity is the solution that is 1.0 m in both acetic acid and sodium acetate.

Buffer capacity refers to the effectiveness of a buffer in resisting changes in pH when exposed to additional acid or base. The higher the buffer capacity, the more resistant the solution is to changes in pH. The buffer solution that will have the greatest buffer capacity is the solution that is 1.0 m in both acetic acid and sodium acetate. Acetic acid is an organic acid that reacts with a strong base like sodium hydroxide to produce a salt of acetic acid, known as sodium acetate. In this reaction, one hydrogen ion of acetic acid is replaced by a sodium ion.

The chemical equation is as follows:

C2H4O2(aq) + NaOH(aq) → NaC2H3O2(aq) + H2O(l)

This reaction produces a buffer solution of acetic acid and sodium acetate. The solution has a pH of around 4.8 and acts as a buffer because the acetate ions can react with additional hydrogen ions, while acetic acid can react with additional hydroxide ions, thus preventing significant changes in pH. The other options contain the following: a solution that is 0.1 m in both ammonia and ammonium nitrate, a solution that is 1.0 m in HBrO and 0.1 m in NaBrO, a solution that is 0.1 m in both acetic acid and sodium acetate, a solution that is 0.1 m in ammonia and 1.0 m in ammonium nitrate.

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Answer:

thermal and light energy

Answer:

E = hc/λ

Explanation:

To calculate the energy of a photon of radiation, we can use the formula:

E = hf = hc/λ

where:

E = energy of the photon (in Joules)

h = Planck's constant (6.626 x 10^-34 Joule-seconds)

f = frequency of the radiation (in Hertz)

c = speed of light (3.0 x 10^8 meters/second)

λ = wavelength of the radiation (in meters)

For a frequency of 8.24 x 10^14 Hz:

E = hf = (6.626 x 10^-34 J*s)(8.24 x 10^14 Hz) = 5.46 x 10^-19 J

For a wavelength of 6.44 x 10^-9 m:

E = hc/λ = (6.626 x 10^-34 J*s)(3.0 x 10^8 m/s)/(6.44 x 10^-9 m) = 3.07 x 10^-19 J

To calculate the wavelength of light that emits 3.3 x 10^-13 Joules of energy:

E = hc/λ

λ = hc/E = (6.626 x 10^-34 J*s)(3.0 x 10^8 m/s)/(3.3 x 10^-13 J) = 6.01 x 10^-7 m = 601 nm

answer: it is true because a hypothesis is something you think will happen during a experiment

explained: I took the test

The process through which a reactant loses electrons during a chemical reaction is known as oxidation. Reduction refers to the process through which a reactant acquires electrons during a reaction.

Such a thing typically happens if an acid reacts with a metal. Oxidation describes the process through which a reactant loses electrons during a chemical reaction.

Adding oxygen or any electronegative element, or taking away hydrogen or any electropositive one, is what is meant by the term "oxidation" in Classical and earlier concepts. Adding hydrogen or another electropositive element, or getting rid of oxygen or another electronegative one, is what reduction is all about, according to the classical or older idea.

An example of oxidation is C + O₂→ CO₂

An example of reduction is N₂ + 3H₂ → 2NH3

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Answer:

1. What is the difference between a chemical and physical change?

physical change :-

chemical change :-

2. What is the difference between a property and change

change:-

A physical change in a substance doesn't actually change what the substance is. It remains the same. In a chemical change where there is a chemical reaction, a new substance is formed and energy is either given off or absorbed.

property:-

A physical property is an aspect that can be observed or measured without being changed. A chemical property may only be observed by changing the chemical identity or substance.

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The type of charge does a hydrogen atom carry when it is bonded to another atom by a hydrogen bond will be partial positive charge

Partial positive charge, a hydrogen atom carries a partial positive charge  when it is bonded to another atom by a hydrogen bond

A hydrogen patch forms from two hydrogen titles, each with one electron in a 1 s orbital. The two hydrogen titles are attracted to the same brace of electrons in the covalent bond. The bond is either a brace of “ blotches ” or a solid line.

Two hydrogen atoms, each of which has one electron inside a 1 s orbital, combine to create a hydrogen molecule. The covalent bond's identical electron pair attracts the two hydrogen atoms. The bond is shown as a solid line or as an pair of "dots."

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Answer:

1. Water.

2. Oxygen.

Explanation:

Two molecules that would be found in a healthy cell are WATER and OXYGEN.

I hope it helps! Have a great day!

Answer:

Option A:

Zn(s) + Cu^(2+) (aq) → Cu(s) + Zn^(2+)(aq)

Explanation:

The half reactions given are:

Zn(s) → Zn^(2+)(aq) + 2e^(-)

Cu^(2+) (aq) + 2e^(-) → Cu(s)

From the given half reactions, we can see that in the first one, Zn undergoes oxidation to produce Zn^(2+).

While in the second half reaction, Cu^(2+) is reduced to Cu.

Thus, for the overall reaction, we will add both half reactions to get;

Zn(s) + Cu^(2+) (aq) + 2e^(-) → Cu(s) + Zn^(2+)(aq) + 2e^(-)

2e^(-) will cancel out to give us;

Zn(s) + Cu^(2+) (aq) → Cu(s) + Zn^(2+)(aq)

Answer:

\(\boxed {\boxed {\sf B. \ 0.5 \ M}}\)

Explanation:

Molarity is a measure of concentration in moles per liter. The formula for calculating molarity is:

\(molarity= \frac{moles \ of \ solute}{ liters \ of \ solution}\)

There are 2 moles of a compound or the solute. There are 4 liters of water or the solution.

Substitute the values into the formula.

\(molarity = \frac{ 2 \ mol}{ 4 \ L}\)

Divide.

\(molarity= 0.5 \ mol /L\)

1 mole per liter is equal to 1 Molar, so the solution's molarity of 0.5 mol/L is equal to 0.5 M.

\(molarity = 0.5 \ M\)

The molarity of the solution is 0.5 Molar and choice B is correct.

Answer:

A

Explanation:

Hopefully this helps

Answer:

A copy of DNA is made from existing DNA.

Explanation:

Just did the quiz

Answer:

Hydroxide and thio relaxers are not compatible because they work on different mechanisms to straighten hair. Hydroxide relaxers work by breaking the disulfide bonds in the hair, while thio relaxers work by breaking the protein bonds. Mixing these two types of relaxers could cause severe damage to the hair and scalp, leading to breakage, hair loss, and other issues. It is important to choose one type of relaxer and stick with it to achieve the desired results safely.

Explanation:

Answer:

sodiom i think

Explanation: