when a natural gas valve is opened, allowing methane to escape into the air at 250c, no reaction occurs. when a spark is used, the methane combusts and a flame persists as heat is continuously released. why is a spark required for the reaction to occur?

The final pressure of the gas in the container will be approximately 28.4 atm.

To determine the final pressure when the temperature of a gas is increased, we can use the ideal gas law equation, which states:

PV = nRT

Where:

P = pressure of the gas

V = volume of the gas

n = number of moles of gas

R = ideal gas constant

T = temperature of the gas (in Kelvin)

To solve this problem, we need to convert the temperatures from Celsius to Kelvin since the ideal gas law requires temperature in Kelvin. The Kelvin temperature scale is obtained by adding 273.15 to the Celsius temperature.

Given:

Initial pressure (P1) = 26.6 atm

Initial temperature (T1) = 16.9 oC

Final temperature (T2) = 37.0 oC

Converting temperatures to Kelvin:

T1 = 16.9 + 273.15 = 290.05 K

T2 = 37.0 + 273.15 = 310.15 K

Using the ideal gas law equation, we can set up the following relationship between the initial and final states:

P1V1 / T1 = P2V2 / T2

Since the volume (V) and the number of moles (n) are constant, we can cancel them out in the equation.

P1 / T1 = P2 / T2

Now we can plug in the values:

26.6 atm / 290.05 K = P2 / 310.15 K

To solve for P2, we can cross-multiply and then divide:

P2 = (26.6 atm * 310.15 K) / 290.05 K

Calculating this expression, we find the final pressure (P2) to be approximately 28.4 atm when rounded to one decimal place.

Therefore, when the temperature is increased from 16.9 oC to 37.0 oC, the final pressure of the gas in the container will be approximately 28.4 atm.

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Answer:

The molarity (M) of a solution is the number of moles of solute dissolved in one liter of solution. To calculate the molarity of a solution, you divide the moles of solute by the volume of the solution expressed in liters.

The density of the unknown substance is 10,200 kg/m³.

Density is a fundamental property of matter that quantifies how much mass is packed into a given volume. It is typically expressed in grams per cubic centimeter (g/cm³) or kilograms per cubic meter (kg/m³). In this case, the unknown substance has a density of 10.2 g/cm³. To convert this value to kg/m³, we use the conversion factor 1 g/cm³ = 1000 kg/m³.

By multiplying the given density by the conversion factor, we find that the substance's density is 10,200 kg/m³. This means that for every cubic meter of the unknown substance, it has a mass of 10,200 kilograms. A higher density implies a more compact arrangement of particles within the material.

Understanding density is crucial in various applications, such as determining the buoyancy of objects in fluids, identifying substances, and designing structures with specific weight requirements.

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The percent by mass of acetic acid in the vinegar is 2.33%.

Below are the steps to solve the given problem using the data table given below:

Step 1: Calculate the mass of the vinegar. Given,Mass of flask and vinegar solution- 25.17gMass of flask- 15.12gMass of vinegar solution = Mass of flask and vinegar solution - Mass of flask= 25.17 g - 15.12 g= 10.05 g

Step 2: Calculate the moles of NaOH used in the titration.Molarity of NaOH solution is 0.1 M.Moles of NaOH = Molarity × Volume of NaOH usedMoles of NaOH = 0.1 M × 39.00 mL (since the initial volume of NaOH is 0.00 mL)Moles of NaOH = 0.0039 moles

Step 3: Determine the moles of acetic acid used in the reaction.The balanced chemical equation for the reaction between NaOH and acetic acid (the main component of vinegar) is given below:CH3COOH + NaOH → CH3COONa + H2OMoles of NaOH = Moles of CH3COOH (since they react in a 1:1 ratio)Moles of CH3COOH = 0.0039 moles

Step 4: Calculate the mass of acetic acid used in the reaction.Molar mass of acetic acid is 60.05 g/mol.Mass of CH3COOH = Moles of CH3COOH × Molar mass of CH3COOH= 0.0039 moles × 60.05 g/mol= 0.234 gStep 5: Calculate the percent by mass of acetic acid in the vinegar.Percent by mass of acetic acid = (Mass of CH3COOH / Mass of vinegar solution) × 100%= (0.234 g / 10.05 g) × 100%= 2.33%.

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The number 0.005802 expressed in proper scientific notation is 5.802 x 10^-3

Answer:

B

Explanation:

When it freezes, it will be a solid. The molecules will barely move, not as much as in the other answer choices.  

Answer: The answer is 0.0054314469917931, I'm pretty sure.

The empirical formula of the compound is called the formula unit in chemistry. In 1.5 moles of magnesium bromide, \(9.03\times 10^{23}\) formula units are present.

Moles are the measuring units of the molecules, atoms, and other particles of the chemistry. Formula units of any substance can be estimated as the product of the moles and the Avogadros number.

The number of the moles present of the magnesium bromide is 1.5 mol and the value Avogadro number is \(6.02 \times 10^{23}.\)

If 1 mole of the substance contains \(6.02 \times 10^{23}\) formula units, then, formula units in 1.5 moles are:

\(\begin{aligned} & = 1.5 \times 6.02 \times 10 ^{23}\\\\& = 9.03 \times 10^{23} \end{aligned}\)

Therefore, \(9.03 \times 10^{23}\) formula units are present in 1.5 moles of magnesium bromide.

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Answer:

Explanation:

There are many avenues of "current" research, so to spark.

Finding less expensive, and non-toxic materials is important.  Less-enpense, and safer, alternatives to rare earth metals is sought.

Answer:

D. decreased biodiversity

Explanation:

Habitat loss due to the increasing human

population has caused decreased biodiversity

If the conversion of glucose to \(CO_2\) and \(H_2O\) in the body is 90% complete, then the volume of  \(O_2\) consumed would be 0.745 L x 0.9 = 0.671 L (rounded to three significant figures).

The balanced equation for the reaction of glucose (C6H12O6) with oxygen ( \(O_2\)) in the body is:

\(C_6H_{12}O_6 + 6O_2\) → 6 \(CO_2\)  + \(6H_2O\) + energy

According to the equation, 1 mole of glucose reacts with 6 moles of  \(O_2\) to produce 6 moles of  \(CO_2\)  and 6 moles of  \(O_2\) Therefore, to determine the volume of  \(O_2\) consumed, we need to calculate the moles of glucose and the moles of  \(O_2\) consumed.

Calculate the moles of glucose:

moles of glucose = mass of glucose / molar mass of glucose

moles of glucose = 1 g / 180.16 g/mol

moles of glucose = 0.00555 mol

Calculate the moles of  \(O_2\) consumed:

moles of  \(O_2\) = 6 x moles of glucose

moles of  \(O_2\) = 6 x 0.00555 mol

moles of  \(O_2\) = 0.0333 mol

Calculate the volume of  \(O_2\) consumed at STP (standard temperature and pressure, which is 0°C and 1 atm):

volume of  \(O_2\) = moles of  \(O_2\) x molar volume at STP

molar volume at STP = 22.4 L/mol

volume of  \(O_2\) = 0.0333 mol x 22.4 L/mol

volume of \(O_2\) = 0.745 L

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Approximately 2.22 x \(10^2^5\) molecules of nitrogen and 6.29 x \(10^2^4\)molecules of oxygen are present in the International Space Station (ISS). If the oxygen and CO2 scrubber system fails, four astronauts on the ISS have approximately 73 hours before the air becomes unbreathable and they risk losing consciousness.

First, we convert the volume of the ISS to liters: 932 \(m^3\) = 932,000 liters.

Next, we calculate the number of moles of each gas using the ideal gas law equation. The pressure is given as 1 atm, and the temperature is 293 K.

For nitrogen:

PV = nRT

(1 atm)(932,000 L) = n(0.0821 L·atm/(mol·K))(293 K)

n ≈ 2.93 x \(10^4\) moles

For oxygen:

PV = nRT

(1 atm)(932,000 L) = n(0.0821 L·atm/(mol·K))(293 K)

n ≈ 8.29 x \(10^3\) moles

Finally, we convert the number of moles to the number of molecules by multiplying by Avogadro's number (6.022 x \(10^2^3\) molecules/mol).

For nitrogen:

2.93 x \(10^4\) moles × 6.022 x \(10^2^3\) molecules/mol ≈ 2.22 x \(10^2^5\) molecules

For oxygen:

8.29 x \(10^3\) moles × 6.022 x \(10^2^3\) molecules/mol ≈ 6.29 x \(10^2^4\) molecules

Therefore, approximately 2.22 x \(10^2^5\) molecules of nitrogen and 6.29 x \(10^2^4\) molecules of oxygen are present in the ISS.

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Answer:

Solids, liquids and gases are called the three states of matter. I think the answer is density. In general, solids are denser than liquids, which are denser than gases. Also solids have a fixed shape and a fixed volume. Liquids have a fixed volume, but no fixed shape. Gases have neither a fixed volume nor a fixed shape.

Explanation:

Hope this helps

The total ion concentration is the sum of the individual ion concentrations. Thus for the 1 M NaCl, the total ion concentration is 2 M; for the 1 M CaCl 2, the total ion concentration is 3 M.

Define millimolarity?

.

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Molarity H°rxn = Qrxn/(number of moles of AgNO3) = (1170.4 J)/(0.03 mol) ≈ 39013.33 J/mol = 39.013 kilojoules.

The term "Molarity" is derived from the unit of measurement called a mole, which is used to describe chemical substances. Calculating how amount of substance present in a certain chemical solution is done using a concept known as molarity, commonly known as the molar concentration of a solution.

Using the equation Q = m.c.T, Q =??? J, where Q is the quantity of heat produced by the solution, we can figure out the amount of warmth (Q) released from the solution.

The specific heat capacity (c = 4.18 J/g°C) of the solution determines its mass, or m, which is equal towards its density times volume, and (1.0 g/mL) divided only by volume, or 200 g.

(23.20 vs. 1.4) degrees Celsius is the difference in temperature (T) between the initial and final temperatures.

∴ Q = m.c. T = 200 g (at 4.18 J/g°C and 1.4 °C, respectively) = 1170.4 J. H°rxn = Qrxn/(number of moles of AgNO3)

The number of moles of immediately following in a solution that has a volume of 1.0 liters is known as molarity (M).

M is equal to (number of moles of AgNO3)/(volume of a solution (L)).

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Excerpt 1:
"In the study, participants who were exposed to a series of logical reasoning exercises showed a significant improvement in their problem-solving abilities compared to the control group, which did not engage in these activities."
This excerpt demonstrates logical thinking and reasoning as it presents the results of a study that examines the impact of logical reasoning exercises on problem-solving abilities. The study design, comparing a group that participated in the exercises to a control group, allows for the isolation of the effect of the exercises and supports the conclusion that logical reasoning activities lead to improvements in problem-solving skills.

Excerpt 2:
"Further analysis of the data revealed a strong correlation between the number of logical reasoning exercises completed and the improvement in participants' problem-solving skills, suggesting that regular engagement in these activities can contribute to enhanced cognitive abilities."
In this excerpt, the relationship between the frequency of engagement in logical reasoning exercises and the improvement in problem-solving skills is explored. The strong correlation mentioned indicates that the more participants engage in these activities, the more their cognitive abilities improve. This analysis supports the idea that practicing logical reasoning can lead to cognitive enhancements, showcasing logical thinking and reasoning in the evaluation of the data.

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Yes, in qualitative anion analysis, there is a specific order that is commonly followed to systematically identify and separate different anions present in a given sample.

Yes, in qualitative anion analysis, there is a specific order that is commonly followed to systematically identify and separate different anions present in a given sample. This order is known as the systematic scheme or the systematic qualitative analysis.

The systematic scheme generally begins with the preliminary tests to determine the presence of certain groups of anions based on their characteristic reactions. These preliminary tests help in narrowing down the possibilities and guide the subsequent steps.

Following the preliminary tests, the anions are typically separated into groups based on their behavior in specific reagents or precipitating agents. Each group of anions is then subjected to specific confirmatory tests to identify the presence of particular anions within that group. The separation and identification process continues with subsequent groups until all relevant anions have been identified or excluded.

The specific order of the systematic scheme may vary slightly depending on the analytical method or the specific laboratory protocols being followed, but the overall goal remains the same: to systematically identify and separate anions in a logical and efficient manner.

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Answer:

374°F

463.15K

Explanation:

This particular Question wants to test knowledge on the conversion of the units of temperature from celsius degree to degree Fahrenheit. Also, the conversion of degree celsius to kelvin.

The value given which is 190 degree celsius can be converted into degree Fahrenheit using the formula below;

(x°C × 9/5 ) + 32.

Therefore, x = 190°C =( 190°°C × 9/5) + 32 = 374°F.

The conversion of degree celsius to kelvin is given below as;

x°C + 273.15 .

Therefore, x = 190°C = 190°C + 273.15 = 463.15K.

Therefore, the temperature needed to bake at Fahrenheit and kelvin are 374°F and 463.15K respectively.

226.56 moles of carbon dioxide are produced when 28.32 moles of butane react with oxygen.

The equation of the combustion of butane is given as,

C₄H₁₀ + 13O₂ → 8CO₂ + 10H₂O

To determine the number of moles of carbon dioxide produced when 28.32 moles of butane react with oxygen, we need to use the mole ratio between butane and carbon dioxide, 1 mole of butane : 8 moles of carbon dioxide

We can set up a proportion to solve for the unknown number of moles of carbon dioxide (x),

1 mole of butane / 8 moles of carbon dioxide = 28.32 moles of butane / x

Cross-multiplying, we get,

x = (8 moles of carbon dioxide x 28.32 moles of butane) / 1 mole of butane

x = 226.56 moles of carbon dioxide

Therefore, the number of moles of carbon dioxide produced is 226.56 moles.

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Complete question - Determine the number of moles of carbon dioxide produced if 28.32 moles of butane reacted with oxygen.

Answer:

0.086

Explanation:

got it on acellus

The mass of the dry solute recovered from the given data is 0.086 g.  Option C

To determine the mass of the dry solute recovered, we need to subtract the mass of the boat from the mass of the boat with the dry solute.

Given the data provided:

Boat Mass: 0.730 g

Boat + Solution: 0.929 g

Boat + Dry: 0.816 g

To find the mass of the dry solute, we subtract the boat mass from the boat + dry mass:

Mass of Dry Solute = (Boat + Dry) - (Boat Mass)

Mass of Dry Solute = 0.816 g - 0.730 g

Mass of Dry Solute = 0.086 g

Therefore, the correct answer is c) 0.086 g.

The mass of the dry solute recovered from the given data is 0.086 g. It is important to note that the mass of the dry solute is obtained by subtracting the mass of the boat from the mass of the boat with the dry solute, as the boat mass represents the weight of the empty boat or container used in the experiment.

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The balanced net ionic equation for the reaction that occurs in the given case is:

Zn(s) + Pb(NO3)2(aq) → Zn(NO3)2(aq) + Pb(s)
In the given reaction, Zinc metal (Zn) is immersed in a solution containing Zinc Chloride (ZnCl2) and Lead Nitrate (Pb(NO3)2), creating a galvanic cell. As a result, Zinc atoms are oxidized and lose electrons to form Zn2+ ions, and Lead ions (Pb2+) in the solution are reduced by gaining these electrons and forming Lead metal (Pb) on the electrode.

The balanced net ionic equation represents the chemical reaction that occurs only at the electrode surface and excludes spectator ions (ions that do not participate in the reaction). In this case, the balanced net ionic equation is obtained by canceling out the common ions that appear on both sides of the overall ionic equation.



The balanced net ionic equation for the given case represents the transfer of electrons between Zinc and Lead ions. It shows that Zinc metal is oxidized to form Zinc ions (Zn2+), and Lead ions (Pb2+) are reduced to form Lead metal (Pb) on the electrode. The net ionic equation is obtained by canceling out spectator ions (Cl-, NO3-) that do not participate in the reaction. This equation is essential for understanding the chemical reaction that occurs in galvanic cells and electrochemical systems.

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The number of moles present in a 500mL flask that is filled with krypton (Kr) at STP is 0.022 moles.

The number of moles in a substance can be calculated using the following ideal gas law equation as follows:

PV = nRT

Where;

According to this question, a 500mL flask is filled with krypton (Kr) at STP. The values of T, P and R at STP are as follows:

1 × 0.5 = n × 0.0821 × 273

0.5 = 22.41n

n = 0.022 moles

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Answer:

The answer is Inference.

Answer:

i think that the children will inherit the brown eyes, it is the best answer since the other things cant be inherited and he dyed his hair blonde

Explanation:

Answer:

\(2~CH_3OH+3~O_2\rightarrow2~CO_2+4~H_2O\\\)

The coefficients would be 2, 3, 2, and 4.

Explanation:

If we want to check this we would multiply the coefficient by each element. What we want is to have the same number of atoms on each side.

Reactant side:

Product side:

And that's it!

Answer:

The answer is B. they deliver oxygen to the blood.

Explanation:

Well air gets inside you to your lungs by your nose and mouth and once its inside your lungs travels that oxygen to your blood and takes "old" oxygen and releases it back out, all of this happens very quickly.

The lungs, nose, and trachea are organs of the respiratory system, in the body they deliver oxygen to the blood, hence option B is correct.

The network of organs and tissues that aids in breathing is known as the respiratory system. It consists of your blood vessels, lungs, and airways.

Alveolar walls include blood arteries called capillaries. Through the pulmonary artery and pulmonary vein, blood enters and exits the body through capillaries.

Blood absorbs oxygen from the air in the alveoli while it is in the capillaries and releases carbon dioxide via the capillary wall into the capillaries.

Therefore, the function of the respiratory system is to deliver oxygen to the blood.

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Answer:

There are 20 neutrons in this atom.  

Explanation:

Answer:

Friction that is the answer pls brainlist me