Is anyone good at 10th grade chemistry if so can someone help me please ?

If I have 5 moles of a gas at a pressure of 6.5 atm and a volume of 14 liters, what is the temperature?

PV=nRT

Problem 1:

we need 80 g of the 15% solution and 120 g of the 20% solution.

Let x be the mass of the 15% solution needed and y be the mass of the 20% solution needed.

x + y = 200 (total mass of the two solutions)

0.15x + 0.2y = 0.17(200) (total amount of solute in the two solutions)

Solving these equations,  x = 80 g and y = 120 g.

Therefore, we need 80 g of the 15% solution and 120 g of the 20% solution.

Problem 2:

we need 120 g of the 18% solution and 180 g of the 5% solution.

Let x be the mass of the 18% solution needed and y be the mass of the 5% solution needed.

x + y = 300

0.18x + 0.05y = 0.07(300)

Solving these equations, x = 120 g and y = 180 g.

Therefore, we need 120 g of the 18% solution and 180 g of the 5% solution.

Problem 3:

The mass percentage of the final solution is 135 g/550 g × 100% = 24.55%.

The total mass of the final solution is 200 g + 350 g = 550 g.

The total amount of solute in the final solution is:

0.15(200 g) + 0.20(350 g) = 65 g + 70 g = 135 g.

Therefore, the mass percentage of the final solution is 135 g/550 g × 100% = 24.55%.

Problem 4:

The mass percentage of the final solution is 110 g/335 g × 100% = 32.84%.

The total mass of the final solution is 300 g + 35 g = 335 g.

The total amount of solute in the final solution is:

0.15(300 g) + 35 g = 75 g + 35 g = 110 g.

Therefore, the mass percentage of the final solution is 110 g/335 g × 100% = 32.84%.

Problem 5:

The mass percentage of the final solution is 18.18%.

Calculate the final mass of the solution:

Final mass = 400 g + 150 g = 550 g

Calculate the mass of solute in the 25% solution:

Mass of solute = 0.25 x 400 g = 100 g

Calculate the mass percentage of the final solution:

Mass percentage = (mass of solute ÷ final mass) x 100%

Mass percentage = (100 g ÷ 550 g) x 100%

Mass percentage = 18.18%

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Answer:

Therefore, the concentration of the resulting dilute solution is 0.190 M.

Explanation:

To determine the concentration of the resulting dilute solution, we can use the equation:

M1V1 = M2V2

where M1 and V1 are the initial concentration and volume of the solution, and M2 and V2 are the final concentration and volume of the solution.

In this case, the initial solution is 10.0 mL of 4.00 M NaCl, which can be expressed as:

M1 = 4.00 M

V1 = 10.0 mL = 0.0100 L

The final volume of the solution is the sum of the initial volume and the volume of water added:

V2 = V1 + V_water

V2 = 0.0100 L + 0.200 L

V2 = 0.2100 L

Since the amount of NaCl in the solution does not change upon dilution, we can set up the equation and solve for the final concentration:

M1V1 = M2V2

(4.00 M)(0.0100 L) = M2(0.2100 L)

M2 = (4.00 M)(0.0100 L)/(0.2100 L)

M2 = 0.190 M

Therefore, the concentration of the resulting dilute solution is 0.190 M.

Considering the phase diagram, the state of matter that exists in area B is gas.

The correct option is A.

A phase diagram is a graphical representation that shows the conditions of temperature and pressure at which different phases or states of a substance exist.

The axes of a phase diagram typically represent temperature (usually on the horizontal axis) and pressure (usually on the vertical axis). The diagram is divided into regions that correspond to different phases, and the lines separating these regions represent phase boundaries.

The point where three phase boundaries meet is known as the triple point, which represents the temperature and pressure at which all three phases can coexist in equilibrium.

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Answer:

The three primary colors used when mixing dyes or paints are red, yellow, and blue. Other colors are often a mixture of these three colors. Try running a chromatography test again with non-primary-color markers, like purple, brown, and orange.

Explanation:

The van't Hoff factor for C5H4 is 1.

The van't Hoff factor, denoted as i, represents the number of particles that a solute dissociates into when it dissolves in a solvent. In the case of C5H4, which is a neutral compound, it does not dissociate or ionize when it dissolves in a solvent.

Therefore, the van't Hoff factor for C5H4 is 1, indicating that it remains as a single particle in the solvent.

When a solute dissolves in a solvent, it can sometimes dissociate into multiple particles, such as ions or molecules.

This leads to an increase in the total number of particles in the solution, affecting various properties like colligative properties (e.g., boiling point elevation, freezing point depression).

However, C5H4 does not exhibit this behavior and does not break apart into ions or molecules upon dissolution. Hence, the van't Hoff factor for C5H4 is 1, implying that it does not affect the colligative properties of the solution since it remains as a single particle.

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Answer:

hydroxide ion

Explanation:

acids produce hydrogen ion when dissolved in water

Answer:

3.4027x10^-22

Explanation:

Answer:

P = (Henry's law constant) * (CO2 concentration)

P = (0.034 M/atm) * (0.80 M) = 0.027 atm.

In order to maintain a CO_2 concentration of 0.80 M at 25 degrees Celsius, a pressure of about 23.53 atm would be needed according to Henry's Law.

In the field of Chemistry, Henry's law is used to describe the solubility of gases in liquids. This law states that at a constant temperature, the amount of a given gas that dissolves in a given type and volume of liquid is directly proportional to the partial pressure of that gas in equilibrium with the liquid.

Using the given values from the problem, where the Henry's Law constant (KH) is 0.034 M⋅atm and the desired CO_2 concentration (C) is 0.80 M, we can insert these into the formula for Henry's law: P = C/KH.

By substituting the relevant values, you get P = 0.80 M / 0.034 M⋅atm which equates to approximately 23.53 atm. Therefore, a pressure of about 23.53 atm of carbon dioxide would be needed to maintain a CO_2 concentration of 0.80 M at 25 degrees Celsius.

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A black precipitate is formed by the reaction; Li2S(aq) + Pb(NO3)2(aq) ------> PbS(s) + 2LiNO3(aq) and K2S(aq) + Sn(NO₃)₄(aq)→ SnS(s) + KNO₃(aq)

In a twofold decomposition reaction, the cations swap out their anion companions to form the final product. A precipitate can sometimes be produced by a twofold decomposition reaction.

A precipitate is a solid byproduct of an aqueous species reaction.

Hence, a black precipitate is formed by the reaction; Li2S(aq) + Pb(NO3)2(aq) ------> PbS(s) + 2LiNO3(aq) and K2S(aq) + Sn(NO₃)₄(aq)→ SnS(s) + KNO₃(aq)

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Insoluble sulfide compounds are generally black in color.

Which of the following combinations could yield a black precipitate?

Na2S(aq)+KCl(aq)

Li2S(aq)+Pb(NO3)2(aq)

Pb(ClO3)2(aq)+NaNO3(aq)

AgNO3(aq)+KCl(aq)

K2S(aq)+Sn(NO3)4(aq

The amount of energy needed to heat 500 g of ice at  0⁰C to 60⁰C is 292,400 J. Option C.

In order to calculate the energy required to heat the ice, we need to consider two stages: first, we need to calculate the energy required to melt the ice, and second, we need to calculate the energy required to heat the resulting liquid water to 60°C.

To melt the ice, we need to supply energy equal to the heat of fusion of ice. The heat of fusion of ice is 334 J/g. Therefore, the energy required to melt 500 g of ice is:

Q1 = (334 J/g) x (500 g) = 167,000 J

Once the ice is melted, we need to heat the resulting liquid water to 60°C. The specific heat capacity of water is 4.184 J/(g°C). Therefore, the energy required to heat 500 g of water from 0°C to 60°C is:

Q2 = (4.184 J/(g°C)) x (500 g) x (60°C - 0°C) = 125,520 J

The total energy required to melt the ice and heat the resulting liquid water to 60°C is the sum of Q1 and Q2:

Q = Q1 + Q2 = 167,000 J + 125,520 J = 292,520 J

Thus, the amount of energy needed to heat 500 g of ice at  0⁰C to 60⁰C is 292,400 J.

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ANSWER : Metallic bonding is a type of chemical bonding that occurs between metal atoms. It involves the sharing of valence electrons between metal atoms, resulting in a sea of electrons that surrounds a lattice of positively charged metal ions.

Two common properties of metals are malleability and conductivity. Malleability refers to the ability of a metal to be shaped into thin sheets without breaking, while conductivity refers to the ability of a metal to conduct electricity and heat.

Metallic bonding produces these properties because the sea of delocalized electrons is free to move throughout the lattice of metal ions. When a force is applied to a metal, the ions in the lattice can slide past each other, facilitated by the movement of these electrons. This ability to move and slide past each other is what gives metals their malleability.

Similarly, the delocalized electrons are able to carry an electric current through the metal lattice. As electrons move through the metal lattice, they collide with the metal ions, transferring energy and producing heat. This transfer of energy is what gives metals their high thermal conductivity. In addition, the delocalized electrons are also able to transfer electrical charge through the metal lattice, resulting in the high electrical conductivity observed in metals.

In summary, metallic bonding produces the properties of malleability and conductivity in metals by creating a sea of delocalized electrons that can move freely throughout the lattice of metal ions, allowing for the movement of ions and the transfer of energy and electrical charge.

Explanation :

there you go home this helps :)

Answer:

D

Explanation:

The unit used to measure atomic mass is the atomic mass unit (amu). A single amu is equivalent to 1/12 the mass of an atom from the carbon-12 isotopIsotopes with different numbers of protons and neutrons will have an actual mass slightly different from the atomic mass calculated in atomic mass units.

Answer:

Su fórmula molecular es Na Cl y es el producto de la base hidróxido sódico (NaOH) y ácido clorhídrico, H Cl. En general, las sales son compuestos iónicos que forman cristales. Son generalmente solubles en agua, donde se separan los dos iones. Las sales típicas tienen un punto de fusión alto, baja dureza, y baja compresibilidad.

Explanation:

Answer:

Explanation:

aluminum

Answer: The aluminum ion

Explanation:

Answer:

Black and Textured

Explanation:

Dark colors absorb more energy than light colors, and reflect less energy than light colors.

Rough surfaces absorb more energy than smooth surfaces, and reflect less energy than smooth surfaces.

The kind of material that would best accomplish the aforementioned task of warmth is: A. black and textured.

Radiation can be defined as the transfer of energy in the form of waves particles through a material medium or space. Thus, radiation is typically a type of heat transfer which causes a person residing on planet Earth and sitting under the Sun (solar energy) to feel warm.

In this scenario, the kind of material that would best accomplish the task of warming the house by maximizing the absorption of solar energy is a  black and textured material because it absorb more energy while reflecting less energy than bright and smooth materials.

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Answer:

Explanation:

First particle drawing:

Ba(OH)2 (aq) + H2SO4 (aq)

  o         o

 / \       / \

Ba  Ba     H  S(=O)2-OH

 \ /       \ /

  o         o

Reactants together in the container prior to any reaction taking place. Ba(OH)2 (aq) and H2SO4 (aq) are present in the container. The Ba(OH)2 particles are shown as two Ba atoms connected to each other by a chemical bond and surrounded by hydroxide (OH-) ions, represented by circles. The H2SO4 particles are shown as two H atoms connected to a S atom and two O atoms connected to the S atom, each with a single bond, and an -OH group connected to one of the O atoms, represented by circles.

Second particle drawing:

     o       o

    / \     / \

   Ba  S(=O)2-OH

  / \     / \

 OH OH  OH OH

Species present at the equivalence point. The reaction is complete, and all of the Ba(OH)2 and H2SO4 have reacted to form BaSO4 (barium sulfate) and H2O (water). The particles of BaSO4 are shown as a Ba atom connected to an S atom and four O atoms, each with a single bond, represented by circles, and the particles of H2O are shown as two H atoms connected to an O atom, represented by circles.

Third particle drawing:

     o       o

    / \     / \

   Ba  S(=O)2-OH

  / \     / \

 OH OH  OH OH

       /

      H+

Species present after the equivalence point while sulfuric acid is still added. All the barium hydroxide has been consumed, but some sulfuric acid is still present. The H+ ions from the sulfuric acid combine with the OH- ions in the solution to form water (H2O), represented by circles. The BaSO4 particles are still present in the solution.

Answer:

Phenol is more acidic than alcohol due to resonance stabilization of the phenoxide ion.

Synthetic materials are made from natural resources and can be used for many purposes.

Synthetic materials are made by chemically changing the starting substances to create a material with different characteristics. Some examples of synthetic materials are plastics, medicines, and new fuels.

A synthetic substance may be chemically identical to a naturally-occurring substance or may be different.

Item is made from a synthetic material :

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The larger pieces of ice absorb heat quickly than the more finely crushed ice then the more finely crushed ice absorbed heat fastly

Heat is the transfer of kinetic energy from one medium or object to another from an energy source to a medium or object

Crushed ice melt faster than the ice cube even having the same mass and it is because that when you crushed an ice cubes you are increasing the amount of surface area exposed to the environment and the more area exposed to the faster the heat will flow from high to low temp like the ice cubes that's why more finely crushed ice absorbed heat faster than larger pieces of ice

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Answer:

The digestive role of the liver is to produce bile and export it to the duodenum. The gallbladder primarily stores, concentrates, and releases bile. The pancreas produces pancreatic juice, which contains digestive enzymes and bicarbonate ions, and delivers it to the duodenum.

Explanation:

The chemical process of digestion begins during chewing as food mixes with ... The esophagus is a tubular organ that connects the mouth to the stomach. ... Acid reflux or “heartburn” occurs when the acidic digestive juices escape into the esophagus. ... The secretions of the liver, pancreas, and gallbladder are regulated by ...

-Both our right just choose one,

Answer:

about 6 min

Explanation:

We can compute the number of moles of oxygen created in the process using the supplied equation. We know that two moles of water (2H2O) and one mole of oxygen (O2) are created for every two moles of hydrogen peroxide (2H2O2) consumed.

Given that the number of moles of hydrogen peroxide (2H2O2) is 0.2 mol, the number of moles of oxygen created may be calculated as follows: 0.1 mol O2 = 0.2 mol x (1 mol O2/2 mol 2H2O2).

As a result, the amount of oxygen created in the reaction 2H2O2(aq) 2H2O(l) + O2(g) is 0.1 mol. The correct response to the question is 0.1  Mole in total.

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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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The answer is 1ml. The answer is 1ml because of calibration of this graduated cylinder

Answer:

1 mL

Explanation:

According to your definition, it is the difference between marked spaces divided by the # of spaces between marked values.

Difference between 2 marked values: 5 mL

# Of Spaces between marked values: 5

Calibration: 5 mL / 5 mL = 1 mL

Answer:

Cautiously and avoiding filling in the central area so that it does not overflow when filling, since being very beach makes filling difficult.

Explanation:

The basins are shallow, that is why filling is difficult, the filling must be slow, low intensity and at the edges not placing the water filling in the center of the basin.

When you fill a basin with liquid water, you can see that the water takes the shape of the container in which it is contained. This is because in the liquid state, water has molecules farther apart than in the solid state.

You can notice this property when performing an experiment with liquid and solid water.

When filling a glass, liquid water takes on the shape of a glass, and solid water, such as an ice cube, remains the same shape when placed in a glass.

Therefore, when filling a basin with water we perceive a property of the physical state of water, in liquid form. Water is one of the few substances that can be found naturally in liquid, solid and gaseous states.

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Answer:

The correct answer is - exothermic reaction.

Explanation:

Exothermic reactions are the reaction that releases energy into the surrounding and does not require energy to take place due to the total energy of the reactants the total energy of the products is more than tthe total energy of the products. It releases energy usually as heat or light with the product.

In the given condition of room temperature mixing two substance produces hot products, fits with the explanation given above, therefore, it is an exothermic reaction.

Answer:

Image result for Where do karst regions occur?

Karsts are found in widely scattered sections of the world, including the Causses of France; the Kwangsi area of China; the Yucatán Peninsula; and the Middle West, Kentucky, and Florida in the United States.

Explanation:

Answer:

Middle West Kentucky.

Explanation:

Karst are found in widely scatter sections of the world.

Saponification number = (V × M × F × 56.1) / W

Where:

V = volume of HCl used in the back titration

M = molarity of HCl

F = factor of KOH (which is 1 for pure KOH)

W = weight of the butter sample used in grams

First, we need to calculate the amount of KOH used in the saponification reaction:

0.5131 M KOH = 0.5131 moles KOH / liter

25.00 mL KOH = 0.02500 L KOH

moles KOH used = 0.5131 moles/L × 0.02500 L = 0.0128 moles KOH

Since the saponification reaction is a 1:1 reaction between KOH and the triacylglycerol in the butter sample, the amount of butter used is also 0.0128 moles.

Next, we need to calculate the amount of HCl that reacted with the excess KOH:

0.5000 M HCl = 0.5000 moles HCl / liter

10.26 mL HCl = 0.01026 L HCl

moles HCl used = 0.5000 moles/L × 0.01026 L = 0.00513 moles HCl

Since the reaction between HCl and KOH is also a 1:1 reaction, the moles of KOH that were not used in the saponification reaction is equal to the moles of HCl used in the back titration:

moles KOH not used = moles HCl used = 0.00513 moles HCl

To find the saponification number,

Saponification number = (V × M × F × 56.1) / W

Saponification number = (0.01026 L × 0.5000 moles/L × 1 × 56.1) / 2.085 g

Saponification number = 6.50

Therefore, the saponification number for this sample of butter is 6.50.

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Answer:

point 2 and 4

Explanation:

because at those point temperature is constant