Which of the following is used as a refrigerant?
methane
esters
freon
fluorine

Answer:

The most concentrated solution is the one with the highest molarity. Molarity is calculated by taking the moles of solute/ liters of solution. The already gave you the molarity, so you do not need to calculate it. The most concentrated solution is the 0.25 M KCl.

Hope this helps!

Answer:

protons

Explanation:

Moles are produced when there is magnesium Explanation:

Answer:

1.55g of propane, C3H8

Explanation:

Step 1:

The balanced equation for the reaction. This is given below:

C3H8 +5O2 —> 3CO2 + 4H2O

Step 2:

Data obtained from the question. This include the following:

Volume (V) of O2 = 3.29L

Pressure (P) = 1.05 atm

Temperature (T) = –34°C = –34°C +273 = 239K

Number of mole O2 =...?

Gas constant (R) = 0.082atm.L/Kmol

Step 3:

Determination of the number of mole of O2 that reacted.

The number of mole of O2 that reacted can be obtained by using the ideal gas equation as follow:

PV = nRT

Divide both side by RT

n = PV /RT

n = (1.05 x 3.29)/(0.082 x239)

n = 0.176 mole

Therefore, 0.176 mole of O2 was used in the reaction.

Step 4:

Determination of the number of mole of C3H8 needed to react with 0.176 mole of O2.

This can be obtained as follow:

From the balanced equation above,

1 mole of C3H8 reacted with 5 moles of O2.

Therefore, Xmol of C3H8 will react with 0.176 mole of O2 i.e

Xmol of C3H8 = 0.176/5

Xmol of C3H8 = 0.0352 mole

Step 5:

Conversion of 0.0352 mole of C3H8 to grams.

This is illustrated below:

Mole of C3H8 = 0.0352 mole

Molar mass of C3H8 = (3x12) + (8x1) = 44g/mol

Mass of C3H8 =...?

Mass = mole x molar Mass

Mass of C3H8 = 0.0352 x 44

Mass of C3H8 = 1.55g.

Therefore, 1.55g of propane, C3H8 were used in the reaction.

Final answer:

To find out how many grams of propane will react with 3.29 L of O₂ at 1.05 atm and -34° C, we use the Ideal Gas Law to calculate moles of O₂ and then use the stoichiometry of the balanced combustion equation to determine the moles of propane. The final step is to convert the moles of propane to grams, resulting in 1.614 grams of propane required.

Explanation:

The balanced chemical equation for the complete combustion of propane (C₃H₈) is:

C₃H₈(g) + 5O₂(g) → 3CO₂(g) + 4H₂O(l)

Calculating Grams of Propane:

First, we need to use the Ideal Gas Law PV = nRT to determine the moles of O₂. Given that P = 1.05 atm, V = 3.29 L, R = 0.0821 L·atm/mol·K, and T = 239 K (-34 °C + 273 = 239 K), we can solve for n (the number of moles of O₂).

n = PV / RT

n = (1.05 atm * 3.29 L) / (0.0821 L·atm/mol·K * 239 K)

n = 0.183 moles of O₂

From the balanced equation, we see that 1 mole of C₃H₈ reacts with 5 moles of O₂. So, we need to find out how many moles of C₃H₈ will react with 0.183 moles of O₂ by dividing by the stoichiometric coefficient of O₂:

moles of C₃H₈ = 0.183 moles of O₂ / 5 = 0.0366 moles of C₃H₈

Now, we calculate the mass of propane by multiplying the moles of C₃H₈ by its molar mass (C₃H₈ = 44.09 g/mol):

mass of C₃H₈ = 0.0366 moles * 44.09 g/mol = 1.614 grams

Therefore, 1.614 grams of propane will react with 3.29 L of O₂ at 1.05 atm and -34° C.

Answer:

.000000022

Explanation:

H3O+=10^-pH

- Hope that helps! Please let me know if you need further explanation.

Final answer:

The 3.5kg bowling ball rolling at 30m/s has a higher momentum than the 50kg student moving at 1.75m/s.

Explanation:

The momentum of an object is defined as the product of its mass and velocity. Therefore, to determine which object has a higher momentum, we need to calculate the momentum of each object. The momentum of an object can be calculated using the formula: momentum = mass * velocity.

For the 3.5kg bowling ball rolling at 30m/s, the momentum would be: momentum = 3.5kg * 30m/s = 105kg.m/s.

For the 50kg student moving at 1.75m/s, the momentum would be: momentum = 50kg * 1.75m/s = 87.5kg.m/s.

Comparing the two, we can see that the bowling ball has a higher momentum of 105kg.m/s, compared to the student's momentum of 87.5kg.m/s.

Answer:

C would be the answer.

Explanation:

Answer:

The answer is C. the distribution of electrons in different shells

Explanation:

I got it right on the test

The color of a rock is determined by the type of mineral it contains. The presence of certain elements and the way light interacts with these minerals can influence the color. While other factors like texture or grain pattern may affect appearance, they do not fundamentally determine the color.

The color of a rock is primarily determined by its mineral type. Different minerals have different colors due to various factors like the way light reflects off their surfaces, their structure, and the presence of certain elements. For example, quartz can be clear or cloudy white, obsidian is a dark, glossy black, and amethyst, a type of quartz, is purple due to the presence of iron. While the texture, grain shape or pattern may affect the overall appearance of a rock, it's the mineral content that fundamentally determines its color.

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The molarity of the solution is approximately 0.141 M. To find the molarity of the solution, we first need to calculate the number of moles of glucose present in the solution using the given mass of glucose and its molar mass.

The molar mass of glucose (C6H12O6) can be calculated by adding the atomic masses of its constituent atoms:

[tex]\[ \text{Molar mass of glucose} = 6 \times \text{Atomic mass of C} + 12 \times \text{Atomic mass of H} + 6 \times \text{Atomic mass of O} \][/tex]

Using the atomic masses provided by the periodic table:

[tex]\[ \text{Molar mass of glucose} = 6 \times 12.01 \, \text{g/mol} + 12 \times 1.01 \, \text{g/mol} + 6 \times 16.00 \, \text{g/mol} \][/tex]

[tex]\[ = 72.06 \, \text{g/mol} + 12.12 \, \text{g/mol} + 96.00 \, \text{g/mol} \][/tex]

[tex]\[ = 180.18 \, \text{g/mol} \][/tex]

Now, we can calculate the number of moles of glucose using the given mass of glucose:

[tex]\[ \text{Number of moles of glucose} = \frac{\text{Mass of glucose}}{\text{Molar mass of glucose}} \][/tex]

[tex]\[ = \frac{5.10 \, \text{g}}{180.18 \, \text{g/mol}} \][/tex]

[tex]\[ \approx 0.0283 \, \text{mol} \][/tex]

Next, we calculate the volume of the solution in liters:

[tex]\[ \text{Volume of solution} = 200.9 \, \text{mL} \times \frac{1 \, \text{L}}{1000 \, \text{mL}} \][/tex]

[tex]\[ = 0.2009 \, \text{L} \][/tex]

Now, we can find the molarity of the solution using the formula:

[tex]\[ \text{Molarity} = \frac{\text{Number of moles of solute}}{\text{Volume of solution in liters}} \][/tex]

[tex]\[ = \frac{0.0283 \, \text{mol}}{0.2009 \, \text{L}} \][/tex]

[tex]\[ \approx 0.141 \, \text{M} \][/tex]

Therefore, the molarity of the solution is approximately 0.141 M.

Answer:

pollution and habitat destruction

Explanation:

Brainliest plzz. to help a sister out

Answer:

Pretty sure that its benzene

Answer:

1) B     2) A

Explanation:

just did it on edg 2020

Answer:

RADIATION IS THE PROCESS WHERE HEAT IS TRANSFERRED THROUGH ELECTROMAGNETIC WAVES THAT MOVE THROUGH SPACE.

Explanation:

Radiation is the transfer of energy in the form of waves through space or a  material medium. It involves the emission of energy through electromagnetic waves such as radio waves, x-rays, gamma rays. Also, particles such as electrons, protons and neutrons are regarded as radiations when they travel at high velocities. Radiation are categorized into two; ionizing and non-ionizing radiations depending on the energy the matter carries.  In ionizing radiation, matters carry sufficient energy which can be used to ionize atoms or molecules and even break chemical bonds; charged particles or ions are therefore produced in matter and such radiations include gamma rays, x-rays, alpha particles, beta particles.

'B. When heat gets transferred through electromagnetic waves that move through space' explains the process of radiation.

Radiation is a method of heat transfer that does not require any medium. This means that heat energy can travel through the vacuum of space. The Sun warming the Earth is a perfect example of radiation. Here’s how it works step-by-step:

Emission of Electromagnetic Waves: A hot object, such as the Sun, emits electromagnetic waves, which may include infrared radiation, visible light, and others.

Travel Through Space: These electromagnetic waves travel through the vacuum of space; no particles are needed to carry this energy.

Absorption: When these waves reach another object, like Earth, they get absorbed by the object’s surface, warming it up.

Different types of electromagnetic waves include radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays. Each type carries energy and can transfer heat through radiation.

Answer:

B

Explanation:

Answer:

For 1-7

Radio Waves

Microwaves

Infrared Waves

Visible Light Rays

Ultraviolet Waves

X-rays

Gamma Rays

And for 8-10

8. shorter

9.higher

10. longer

Answer:

Explanation:

 1. Radio Waves

 2. Microwaves

  3.   Infrared Waves

  4.Visible Light Rays

   5. Ultraviolet Waves

    6. x-rays

    7. Gamma Rays

       8. shorter

      9.higher

     10. longer

Answer: 7.92%

Explanation:

I just answered the question and got it correct.

There is a golden role of solubility, polar solute dissolve in polar solvent and non polar solute dissolve in non polar solvent. Therefore, the percent volume of pyrimidine in this solution is 79.1%.

Solutions are a homogeneous mixture of two or more substances. A solution is a homogeneous mixture of solvent and solute molecules. Solvent is a substance that is in large amount in solution. solute is the substance which is in small amount in a solution.

percent volume=(Volume of Solute/Volume of Solution)×100

Volume of Solute=38.0L

Volume of Solution= 442.0L + 38.0L=480L

substituting all the given values in the above equation, we get

percent volume=(38.0L/480L)×100

percent volume = 79.1%

Therefore, the percent volume of pyrimidine in this solution is 79.1%.

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Answer:it is a

Explanation:

Answer:

The answer is covalent bonding.

Explanation:

When both non-metals react, they will form Covalent bond .

When metals react with non-metal, they form Ionic bond .

When phosphorus (P) reacts with oxygen (O2), they form covalent bonds to create phosphorus pentoxide (P4O10), a chemical bond formed by the sharing of electron pairs between atoms.

When phosphorus (P) reacts with oxygen (O2), it forms a compound called phosphorus pentoxide (P4O10). The type of bond formed in this reaction is a covalent bond. A covalent bond is a chemical bond formed by the sharing of electron pairs between atoms. In this case, phosphorus and oxygen share electrons to achieve a stable electron configuration. Phosphorus needs 3 more electrons to complete its outer shell, while oxygen needs 2 more. So, they share electrons mutually to meet their requirements, forming covalent bonds.

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The answer would be A) Kyrpton

---

After looking at all of these numbers we can see that the element with the highest number of protons is krypton, at 36 protons.

~Hope I could help! Stay safe!~

The term solubility has to do with the ability of a solute to dissolve in a solvent.

The term solubility has to do with the ability of a solute to dissolve in a solvent. The solubility of a solute can be obtained by reading of the solubility curve.

The answers to the questions are;

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Answer:

A

Explanation:

Answer:

C. 11400 years.

Explanation:

The time constant of the isotope is:

[tex]\tau = \frac{5730\,yr}{\ln 2}[/tex]

[tex]\tau = 8266.643\,yr[/tex]

The decay of the isotope is described by the following model:

[tex]\frac{m(t)}{m_{o}} = e^{-\frac{t}{\tau} }[/tex]

[tex]-\frac{t}{\tau} = \ln \frac{m(t)}{m_{o}}[/tex]

[tex]t = -\tau \cdot \ln \frac{m(t)}{m_{o}}[/tex]

[tex]t = -(8266.643\,yr)\cdot \ln \left(\frac{1}{4} \right)[/tex]

[tex]t \approx 11460.001\,yr[/tex]

The right answer is C.

Answer:

The answer IS NOT 448

it might be 0.448 but im not sure

Explanation:

i trusted the person above and it was incorrect so wanted to let yall know its not c

Answer:

public health

Answer: Clean water is important to (public health). Diseases can spread through cities due to unclean water.

Explanation: I hope this helps!

Answer:

kinetic energy

Explanation:

because of the movement of gravity and space

Biodiversity is vital for ecosystem resilience, economic benefits, and human health, with examples like the Amazon rainforest illustrating its importance. Biodiversity also provides essential genetic resources for breeding and holds undiscovered potential for scientific advancement.

Biodiversity is paramount due to its extensive benefits to ecosystems, the economy, and human health. With over 5 million known species, biodiversity contributes to the resilience of ecosystems, allowing them to recover from disturbances and providing a buffer against catastrophic events. An example of biodiversity is the Amazon rainforest, where a vast number of species coexist, each playing a role in maintaining the ecological balance. Economic benefits stem from biodiversity's direct provision of food, medicine, and raw materials, many of which we are yet to fully discover and understand. Biodiversity also ensures the availability of genetic resources which are crucial for crop and livestock breeding, leading to food security. Our current lack of knowledge about so many species indicates there is much more to learn, including potential breakthroughs in science and medicine that could enrich human life.

Answer:

A

Explanation:

Every thing was first a bunch of gas.