Separate samples of an unknown aqueous solution are mixed with solutions of HBr(aq) H_2SO_2(aq). and NaOH(aq). A solid precipitate forms in all three cases. Which of the following cations could the unknown solution contain?
Previous question

Explanation:

For dissolving dry mortar on floor tiles, you can use concrete and mortar dissolver. You can find this product at your local hardware store or online12.

For removing KMnO stains, you can use vinegar. Mix vinegar with water and spray or pour it on the tile surface. Let the vinegar water set in for a few minutes, then sponge the entire area to get it as clean as possible. Next, use a razor blade or scraper to peel up the mortar. Be careful not to gouge or scratch the tiles3.

KMnO is potassium permanganate. it makes water drinkable if it's polluted

For drying acid anhydrides, you can use calcium chloride. Calcium chloride is a hygroscopic substance that absorbs moisture from the air and can be used as a desiccant.

desiccants keeps things dry so they last longer like food & clothes

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Materials are transferred between individual cells and their internal environment through the cell membrane by diffusion, osmosis, and active transport. During diffusion and osmosis, molecules move from a higher concentration to a lower concentration. Osmosis: Osmosis is the movement of solvent particles across a semipermeable membrane from a dilute solution into a concentrated solution. Diffusion: Diffusion is the movement of particles from an area of higher concentration to lower concentration. This would be the diffusion.

Answer:

Multiply the molar amount by Avogadro's number.

Explanation:

An example of heterogeneous equilibrium is:

Heterogeneous equilibrium refers to an equilibrium state in a chemical reaction where the reactants and products exist in different physical states or phases. It occurs when substances in different phases, such as solids, liquids, and gases, are involved in a chemical reaction.

Considering the given equations:

The equation I: FeO(s) + CO(g) ⇌ Fe(s) + CO₂(g) represents a heterogeneous equilibrium.

This is because the reactants and products involve different phases (solid and gas). FeO is a solid (s), CO is a gas (g), Fe is a solid (s), and CO₂ is a gas (g). The reaction involves the conversion of a solid and a gas to another solid and a gas, and the equilibrium is established between these different phases.

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Answer:

all of the above

Explanation:

Answer:

A. 9.83g

B. 13.06

Explanation:

A) To calculate the mass of BaSO4 formed, you need to first write the balanced equation for the reaction:

Ba(OH)2 + H2SO4 -> BaSO4 + 2H2O

Then, you need to find the limiting reactant, which is the one that runs out first and determines how much product is formed. You can do this by converting the volumes and concentrations of the solutions to moles and comparing them with the stoichiometric coefficients.

50 mL of 1.00 M Ba(OH)2 = 0.050 L x 1.00 mol/L = 0.050 mol Ba(OH)2 88.7 mL of 0.475 M H2SO4 = 0.0887 L x 0.475 mol/L = 0.0421 mol H2SO4

According to the equation, 1 mol of Ba(OH)2 reacts with 1 mol of H2SO4, so Ba(OH)2 is in excess and H2SO4 is the limiting reactant.

Next, you need to use the mole ratio between the limiting reactant and the product to find how many moles of BaSO4 are formed:

0.0421 mol H2SO4 x (1 mol BaSO4 / 1 mol H2SO4) = 0.0421 mol BaSO4

Finally, you need to multiply the moles of BaSO4 by its molar mass to get its mass:

0.0421 mol BaSO4 x 233.39 g/mol = 9.83 g BaSO4

So, the mass of BaSO4 formed is 9.83 g.

B) To calculate the pH of the mixed solution, you need to first find the concentration of OH- ions that remain after the reaction. You can do this by subtracting the moles of OH- that reacted with H+ from the initial moles of OH- and dividing by the total volume of the solution.

The initial moles of OH- are equal to the moles of Ba(OH)2:

0.050 mol Ba(OH)2 x (2 mol OH- / 1 mol Ba(OH)2) = 0.100 mol OH-

The moles of OH- that reacted with H+ are equal to the moles of H2SO4:

0.0421 mol H2SO4 x (2 mol H+ / 1 mol H2SO4) = 0.0842 mol H+

The remaining moles of OH- are:

0.100 mol OH- - 0.0842 mol H+ = 0.0158 mol OH-

The total volume of the solution is:

50 mL + 88.7 mL = 138.7 mL = 0.1387 L

The concentration of OH- is:

0.0158 mol OH- / 0.1387 L = 0.114 M

Next, you need to use the relationship between pH and pOH to find the pH:

pOH = -log[OH-] = -log(0.114) = 0.94 pH + pOH = 14 pH = 14 - pOH = 14 - 0.94 = 13.06

So, the pH of the mixed solution is 13.06.

Answer:

159.69 g/mol

Explanation:

Here's the answer hope it helps

ANSWER

The final concentration of the solution is 0.16M

EXPLANATION

Given that;

The initial concentration of the solution is 7.5 M

The initial volume of the solution is 15.8mL

The final volume of the solution is 743.9mL

Follow the steps below to find the final concentration of the solution

Step 1; Apply the dilution formula

Step 2; Substitute the given data into the above formula

Therefore, the final concentration of the solution is 0.16M

Hence, option A is the correct answer

Answer: We can point out two main reasons: atoms and molecules are too small to bee seen without the help of complex equipments and there are too many particles (atoms or molecules) in a small amount of substance (6.022 x 10^23 particles per mol of substance).

Explanation:

The question requires us to explain why atoms and/or molecules can't be count in dozen.

We can point out two main reasons for why it is not practical to count atoms and molecules the way we do with donuts and eggs, for example:

- The first one is the size of this particles. We need powerful and complex equipments to be able to see atoms and molecules. The size of atoms, for example, is measured in Angstroms, which corresponds to 10^-10 meters. Although molecules are slightly bigger, they are still too small to be seen without complex microscopes.

- Considering that we were able to see atoms and molecules in order to count them, there would be another issue: the amount of atoms and/or molecules contained in small amount of substances is too big. For example: let's consider 18 g of water, which corresponds to approximately 1 mol of this substance; in 18 g of water there are 6.022 x 10^23 molecules of water - which is way more complex than counting a dozen (12) units of donuts, for example.

Answer:

C

Explanation:

Since they all are 2 mols worth, all you have to do is count the number of atoms in each molecule

H2SO4 contains 2 hydrogen 1 sulfur 4 oxygen                = 7 atoms

H2S      contains 2 hydrogen and 1 sulfur                          = 3 atoms

H3PO4 contains 3 hydrogens 1 phosphorus  4 oxygens = 8 atoms

HNO3   contains 1 hydrogen 1 nitrogen and 3 oxygens   = 5 atoms

You have the right answer.

Answer:

Sodium has a strong affinity for water and reacts violently with water to produce hydrogen gas. Since hydrogen is highly combustible, it will immediately catch fire. As a result, the fire will spread instead of getting extinguished.    ok

Explanation:

The volume of hydrogen gas required to produce 25.0 grams of water at STP is 31.2 liters.

The balanced chemical equation for the reaction between hydrogen gas and oxygen gas to produce water is:

2H2(g) + O2(g) → 2H2O(l)

From the equation, we can see that 2 moles of hydrogen gas are required to produce 2 moles of water. The molar mass of water is 18 g/mol, so 2 moles of water has a mass of 36 g.

Therefore, to produce 25.0 grams of water, we need to use:

(25.0 g / 36.0 g/mol) * 2 mol H2/mol H2O = 1.39 mol of H2

At STP (standard temperature and pressure), 1 mole of gas occupies 22.4 L of volume.

So, 1.39 moles of H2 will occupy:

1.39 mol x 22.4 L/mol = 31.2 L

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The equilibrium constant of the system can be obtained as  2.6.

We know that we have to obtain the equilibrium constant by setting up the ICE table of the reaction as we can see in the portion below and this is shown as;

           A    +    B ⇆          C

I       0.238     0.238          0

C    -x                -x               +x

E    0.238 - x   0.238 - x        0.072

At equilibrium, we would have;

[A] =  0.238 - 0.072

= 0.166

[B] = 0.238 - 0.072

= 0.166

Then;

K = [C]/[A] [B]

K = [0.072]/(0.166)^2

K = 2.6

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The dot electron structure of the sodium chloride has been shown in the image attached.

We know that the dot electron structure of a compound has to do with the way that electrons are arranged around the valence shells of the elements that are in the compound. We know that in the dot electron structure, we have to show the symbol of the element and then the electrons that surround the outermost shells of the atom as dots.

Sodium chloride is an ionic compound as such it is composed of sodium ion and the chloride ion and the electrons that are found in each of the ions can be shown in the Lewis dot structure of the compound which is seen in the image that has been attached here. The chloride ion has eight electrons while the sodium ion has no electron.

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Answer:

The reaction rate increases in direct proportion to the concentration of the reactant in solution - second order reaction

The reaction rate is constant regardless of the amount of reactant in solution - zero order reaction

An increase in the concentration of the reactant in solution causes the reaction rate to increase exponentially - first order reaction

Explanation:

In a second order reaction, the rate of reaction is directly proportional to the concentration of reactants. This implies that, reaction rate varies as the concentration of the reactant in solution varies.

For a zero order reaction, the rate of reaction is independent of the concentration of the reactants in solution. This means that reaction rate is constant regardless of the amount of reactant in solution.

For a first order reaction, the rate of reaction varies exponentially as the concentration of reactants. Hence, an increase or decrease in the concentration of the reactant in solution causes the reaction rate to increase or decrease exponentially.

The final temperature of the calorimeter, given that it has initial temperature of 23.93 °C is 19.19 °C

We'll begin by obtaining the heat of combustion of 0.531 g of diborane. This is shown below:

1 mole of diborane combust at -1941 KJ

Therefore,

0.0192 mole of diborane will combust at = 0.0192 × -1941 = -37.2672 KJ

Finally, we shall determine the final temperature of the calorimeter. Details below:

H = C(T₂ - T₁)

-37.2672 = 7.854 × (T₂ - 23.93)

Clear bracket

-37.2672 = 7.854T₂ - 187.94622

Collect like terms

-37.2672 + 187.94622 = 7.854T₂

150.67902 = 7.854T₂

Divide both sides by 7.854

T₂ = 150.67902 / 7.854

T₂ = 19.19 °C

Thus, the final temperature is 19.19 °C

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Answer:

Copper Copper Copper Copper

During the daytime, photosynthesis will occur while over a period of time carbon dioxide will accumulate as a result of respiration making it difficult for living things to survive.

It is defined as a process by which plants and other photosynthetic organisms convert the light energy in to chemical energy  through the process of cellular respiration.

Some of the energy which is converted  is stored in molecules of carbohydrates like sugar and starches  which are made up of from carbon dioxide and water . Photosynthetic organisms which can perform photosynthesis  are algae and cyanobacteria. Photosynthesis is largely responsible for producing and maintaining the content of oxygen in earth's atmosphere.

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The easiest way to balance equations is to follow the next steps:

First, we write the unbalanced equation.

Then, we must determine how many atoms of that element are on each side of the reaction.

Then you start to balance element by element by placing the necessary coefficients so that the number of atoms of the element is equal on each side of the reaction. The easiest thing is to leave the oxygen and hydrogen atoms at the end, since they are usually the ones that are in the greatest quantity.

For example, if we have the following reaction

We count the number of atoms of each element. I will show you in the following table:

We see that the equation is not balanced. We will leave hydrogen and oxygen for last. Since Ca is balanced we will start with Nitrogen.

We have 1 atom of nitrogen on the reactants side, and 2 nitrogen atoms on the products side, so we will put coefficient 2 in front of HNO3 molecule and we count again. I will update the table.

We balanced nitrogen, and calcium is still balanced. Now we will continue with hydrogen. We have 4 hydrogen atoms on the reactants side, we have to put coefficient 2 in front of H2O to have 4 hydrogen atoms on the product side. I will update the table.

Now, we have the same number of atoms on each side of the reaction. So, we can say that the equation is balanced. We have as result:

To determine the chemical reaction we must take into account the types of reagents we have, for example. If we have an acid and a base as a result we will have a salt and water. As in the previous case.

Answer:

584.2 g

Explanation:

Hello there!

In this case, since we know the 20% of the atoms correspond to sodium, we can compute the total atoms as shown below:

\(\frac{1.204 x10^{24}}{0.2}=6.02x10^{24}atoms\)

Which are also equal to 1 mol and the Avogadro's number of sodium chloride with a molar mass of 58.44 g/mol; thus, the grams of salt turn out to be:

\(6.02x10^{24}atoms*\frac{1mol}{6.022x10^{23}atoms} *\frac{58.44g}{1mol}\\\\=584.2g\)

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Answer:

40 litres

Explanation:

using Boyle's law V1P1=V2P2

V1=20 l

P1= 60atm

P2= 30 atm V2=?

substituting we will have that

20×60=V2×30

V2={20×60}/30

V2=40 l

The final mass concentration of salt in the solution in g/l is 36.06 g/L.

The mass concentration of the mixture of the two salt solutions is calculated as follows:

Concentration of solution 1 = 15 g/l

mass of salt in the 250 mL solution = 15 g/l * 250 mL * 1 L/1000 mL

mass of salt in the 250 mL solution = 3.75 g

Concentration of solution = 6% (m/v)

This means that in 100 mL solution, 6 g of salt in present.

In 1000 mL or 1 L solution, 60 g of salt will be present.

Hence, the concentration of solution = 60 g/L

mass of salt in the 220 mL solution = 60 g/l * 220 mL * 1 L/1000 mL

mass of salt in the 220 mL solution = 13.2 g

Total mass of salt in the mixture = 16.95 g

Total volume of solution = 470 mL

Final mass concentration of solution = 16.95 g / 470 mL * 1000 mL/L

Final mass concentration of solution = 36.06 g/L

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The best way to measure the pH of a natural solution while out in a forest is to use a portable pH meter or pH test strips specifically designed for field use. These instruments provide accurate and reliable pH measurements and are convenient for outdoor applications.

1. Prepare the necessary equipment: Before heading out to the forest, gather the required tools. You will need a portable pH meter or pH test strips, as well as the necessary reagents or calibration solutions if using a pH meter.

2. Collect the sample: Locate the natural solution you want to measure the pH of, such as a stream, pond, or soil. Use a clean container to collect a representative sample of the solution.

3. Calibrate the pH meter (if applicable): If you are using a portable pH meter, it is essential to calibrate it before taking measurements. Follow the manufacturer's instructions to calibrate the meter using the provided calibration solutions.

4. Conduct the measurement: For pH meters, immerse the electrode into the collected sample. Allow some time for the reading to stabilize, and then record the pH value indicated on the meter's display.

5. Using pH test strips: If you are using pH test strips, dip the strip into the collected sample for the recommended amount of time. Remove the strip and compare the color change with the provided color chart. Determine the corresponding pH value from the chart.

6. Repeat for accuracy: To ensure reliability, repeat the measurement process at least once and compare the results. This step helps confirm the accuracy of your measurements.

7. Record and analyze the data: Note down the pH values obtained and any relevant observations. Analyze the data as needed for your research or monitoring purposes.

By following these steps and using the appropriate equipment, you can effectively measure the pH of a natural solution while in a forest setting.

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Moles of Oxygen they took in : C. 2.42

The gas equation can be written  

\(\large{\boxed{\bold{PV=nRT}}}\)

where  

P = pressure, atm  

V = volume, liter  

n = number of moles  

R = gas constant = 0.08205 l.atm / mol K  

T = temperature, Kelvin  

P=1000 kPa

V = 6 L

T = 298 K

moles of Oxygen :

\(\tt n=\dfrac{PV}{RT}\\\\n=\dfrac{1000\times 6}{8.31\times 298}\\\\n=2.42~moles\)

Explanation:

If the pressure of the system increases, the equilibrium will shift towards the side of the reaction with fewer moles of gas.

There are only gases on both sides of the reaction.

-------------

On the left, there are: 2 moles CO + 1 mole O2 => in total = 3 moles

On the right, there are: only 2 moles of CO2

-------------

The equilibrium will shift to the right because of the fewest moles. Therefore, the quantity of CO2 will increase.

Answer: The quantity of CO2 (g) increases.

A waterfall is a river's water falling rapidly to the ground. It is created in a river's upper course where there are high mountains.

Thus, Many waterfalls are transient and only occur during rainstorms because of their location in the landscape, where they are often over bedrock and fed by a small contributing region.

 For general knowledge, we are listing the "Top 10 Highest Waterfalls in India" here. The Kunchikal Falls are the second-highest waterfall in Asia and the highest in all of India.

The waterfall, which is close to Agumbe in Karnataka's Shimoga district, has a height of 1,493 feet. The Varahi River creates the biggest waterfall. The sole permanent rain forest research is located in Agumbe Valley, one of India's most heavily rained-on regions.

Thus, A waterfall is a river's water falling rapidly to the ground. It is created in a river's upper course where there are high mountains.

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Answer:

\(T2=276K\)

Explanation:

Given:

Initial volume of the balloon V1 = 348 mL

Initial temperature of the balloon T1 = 255C

Final volume of the balloon V2 = 322 mL

Final temperature of the balloon T2 =

To calculate T1 in kelvin

T1= 25+273=298K

Based on Charles law, which states that the volume of a given mass of a ideal gas is directly proportional to the temperature provided that the pressure is constant. It can be applied using the below formula

\((V1/T1)=(V2/T2)\)

T2=( V2*T1)/V1

T2=(322*298)/348

\(T2=276K\)

Hence, the temperature of the freezer is 276 K

Answer: 276 kelvins

Explanation: