What's the answer to this question?

A- 18.3 degrees
B- 124 degrees
C- 23.5 degrees
D- 50.2 degrees

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:

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.

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:

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!

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!~

Answer:

A

Explanation:

Every thing was first a bunch of gas.

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:

Freon

Explanation:

Answer:

Freon

Explanation:

Freon is used as a refrigerant.

Answer: The [tex][OH-][/tex] concentration of the aluminum hydroxide solution is [tex]1.41\times 10^{-10}[/tex]

Explanation:

pH or pOH is the measure of acidity or alkalinity of a solution.

pOH is calculated by taking negative logarithm of hydroxide ion concentration.

[tex]pOH=-\log [OH^-][/tex]

Putting in the values:

[tex]9.85=-\log[OH^-][/tex]

[tex][OH^-]=10^{-9.85}=1.41\times 10^{-10}[/tex]

Thus the [tex][OH-][/tex] concentration of the aluminum hydroxide solution is [tex]1.41\times 10^{-10}[/tex]

Answer: [tex][OH^{-}][/tex] of the aluminium hydroxide solution is [tex]1.41 \times 10^{-6}[/tex].

Explanation:

It is given that pH is 9.85 and the relation between pH and concentration of ions is as follows.

                 pH = [tex]-log [H^{+}][/tex]

                9.85 = [tex]-log [H^{+}][/tex]

          antilog (9.85) = [tex][H^{+}][/tex]

           [tex][H^{+}] = 7.1 \times10^{-9}[/tex]

We also know that,

               [tex][H^{+}][OH^{-}] = 10^{-14}[/tex]

        [tex][OH^{-}] = \frac{10^{-14}}{7.1 \times 10^{-9}}[/tex]

                      = [tex]1.41 \times 10^{-6}[/tex]

Therefore, we can conclude that [tex][OH^{-}][/tex] of the aluminium hydroxide solution is [tex]1.41 \times 10^{-6}[/tex].

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:

pollution and habitat destruction

Explanation:

Brainliest plzz. to help a sister out

Answer:

B

Explanation:

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!

88.98 %

The Balance Chemical Equation is as follow,

                                  2 HCl + Pb(NO₃)₂     →    2 HNO₃ + PbCl₂

According to equation,

          331.2 g (1 mole) Pb(NO₃)₂ produces  =  278.1 g (1 mole) PbCl₂

So,

                 870 g of Pb(NO₃)₂ will produce  =  X g of PbCl₂

Solving for X,

                     X  =  (870 g × 278.1 g) ÷ 331.2 g

                     X  =  730.5 g of PbCl₂

Therefore,

               Theoretical Yield =  730.5 g

Also as given,

                Actual Yield =  650 g

So using following formula for percentage yield,

                        %age Yield  =  (Actual Yield / Theoretical Yield) × 100

Putting values,

                        %age Yield  =  (650 g / 730.5 g) × 100

                        %age Yield  =  88.98 %

Brianliest please and thank you.

Final answer:

To find the percent yield of lead(II) chloride, calculate the theoretical yield based on the balanced chemical equation and the given amount of lead(II) nitrate. Then, divide the actual yield by the theoretical yield and multiply by 100% to find the percent yield.

Explanation:

To find the percent yield of lead(II) chloride, we need to compare the actual yield to the theoretical yield. The theoretical yield is the amount of lead(II) chloride that would be formed if the reaction went to completion. The actual yield is the amount of lead(II) chloride that was actually obtained in the experiment. To calculate the theoretical yield, we can use the stoichiometry of the balanced chemical equation.

From the equation, we can see that 1 mole of lead(II) nitrate reacts with 2 moles of hydrochloric acid to produce 1 mole of lead(II) chloride. Therefore, the amount of lead(II) chloride that would be formed from 870 grams of lead(II) nitrate can be calculated as follows:

Calculate the number of moles of lead(II) nitrate:

Use the mole ratio from the balanced equation to calculate the number of moles of lead(II) chloride that would be formed:

Convert moles of lead(II) chloride to grams:

The actual yield of lead(II) chloride is given as 650 grams. To calculate the percent yield, we use the formula:

Percent Yield = (Actual Yield / Theoretical Yield) x 100%

Substituting in the values we found:

Percent Yield = (650 / 748) x 100% = 86.77%

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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Answer:

protons

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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Answer:

If the temperature was increased to 404 K, its volume would be 3.68 L.

Explanation:

Charles' Law gives a relationship between the volume and the temperature of the gas at constant temperature. This law states that the volume of a given amount of gas held at constant pressure is directly proportional to the temperature.

[tex]V\propto T[/tex]

[tex]\dfrac{V_1}{V_2}=\dfrac{T_1}{T_2}[/tex]

Let

[tex]V_1=2.76\ L\\\\T_1=303\ K\\\\T_2=404\ K[/tex]

Let [tex]V_2[/tex] is new volume. Using above formula we get :

[tex]V_2=\dfrac{V_1T_2}{T_1}\\\\V_2=\dfrac{2.76\times 404}{303}\\\\V_2=3.68\ L[/tex]

If the temperature was increased to 404 K, its volume would be 3.68 L.

Answer:

the first is 5

the second is  3

The third is 5

the last one is  4:)

Explanation:

Aluminum (Al) loses three electrons to form an Al³+ cation while sulfur (S) gains two electrons to form an S²- anion. These cations and anions combine in a 2:3 ratio to form the compound Al2S3.

The electron-dot notation, also known as Lewis symbols, can be used to demonstrate the formation of an ionic compound involving the elements aluminum (Al) and sulfur (S). The aluminum atom loses three electrons to achieve a stable electron configuration, resulting in an aluminum cation with a charge of +3 (Al³+). On the other hand, sulfur gains two electrons to complete its octet, forming a sulfide anion with a charge of -2 (S²-). However, to balance the charges, we need two sulfide ions for every aluminum ion, leading to the formation of the compound Al2S3.

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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.

Final answer:

Potassium hydroxide is a strong base because it fully dissociates in water, A. easily releasing hydroxide ions. Potassium hydroxide (KOH) is a strong base because it easily releases hydroxide ions (OH-). When dissolved in water, KOH dissociates completely into K+ and OH- ions, increasing the concentration of hydroxide ions in the solution.

Explanation:

Potassium hydroxide (KOH) is considered a strong base because when it dissolves in water, it completely dissociates into potassium ions (K+) and hydroxide ions (OH-). This complete ionization in solution is characteristic of a strong base. Wrapping up, the correct answer to why KOH is a strong base is that it easily releases hydroxide ions into the solution.

Final answer:

Potassium hydroxide (KOH) is a strong base because it completely dissociates into potassium ions (K+) and hydroxide ions (OH-) in water, easily releasing hydroxide ions. This complete ionization defines its strength as a base and sets it apart from weak bases, which do not fully ionize.

Explanation:

Potassium hydroxide (KOH) is characterized as a strong base because it easily releases hydroxide ions when dissolved in water. The dissolution of KOH in water is a highly exothermic process where it dissociates completely into potassium (K+) and hydroxide (OH-) ions. This characteristic of complete ionization in solution is what defines a strong base, in contrast to weak bases that only partially ionize.

Unlike substances that do not dissolve well or do not conduct electricity, KOH is very soluble in water and is a good electrical conductor due to the movement of ions. Strong bases like KOH are important in various industrial processes due to their reactivity toward acids and their corrosive nature.

Understanding the behavior of strong bases can be crucial in areas such as acid-base chemistry, titrations, and pH calculations. Potassium hydroxide's complete dissociation into ions is typical of soluble metal hydroxides and is an indicator of its strength as a base.

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:

A

Explanation:

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:

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:

1) B     2) A

Explanation:

just did it on edg 2020