a sample of br2(g) takes 14.0 min to effuse through a membrane. how long would it take the same number of moles of ar(g) to effuse through the same membrane?

Answer:

14.53

Explanation:

V1= 218ML

V2= ?

P2= 15P1

USING BOYLE'S LAW

P1V1= P2V2

V2= P1V1/P2

V2 = P1(218ML)/15P1 = 14.53ML

If 1.5 moles of C₃H₈ react according to the balanced equation, 4.5 moles of CO₂ will be produced.

In the balanced equation, the coefficients in front of the molecules indicate the molar ratio. The coefficient for CO₂ is 3, which means that for every 1 mole of C₃H₈, 3 moles of CO₂ are produced.

The balanced equation shows that 1 mole of C₃H₈ reacts to produce 3 moles of CO₂. So, if 1.5 moles of C₃H₈ react, we can calculate the number of moles of CO₂ produced using a simple ratio.

1 mole of C₃H₈ reacts to produce 3 moles of CO₂.

Therefore, 1.5 moles of C₃H₈ will produce (1.5 moles of C₃H₈) x (3 moles of CO₂/1 mole of C₃H₈)

= 4.5 moles of CO₂.

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Answer:

I believe the answer you're looking for is DNA, not sure though

When chemical reactions occur the arrangement of bonds changes, but the identity of atoms is retained. The correct option is B.

Arrangement of bonds changes, but the identity of atoms is retained. Chemical reactions occur when there are chemical changes that result in the formation of new products from the reactants involved. When chemical reactions occur, the arrangement of bonds changes, but the identity of atoms is retained. It is essential to understand that chemical reactions involve breaking of chemical bonds in the reactants to create new bonds in the products. However, the elements or atoms present in the reactants will remain present in the product.

This means that the identity of atoms is retained during the chemical reaction. Furthermore, the bonds that connect the atoms in the molecules of reactants get broken, and the rearrangement occurs, leading to the formation of new bonds in the products. This results in the change of arrangement of bonds during chemical reactions. Hence, the correct option is B.

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The concentration of hydroxide ions for an aqueous solution of acetic acid

[OH-] =4 × 10-11M

What is concentration of a solution ?

The concentration of a solution is a measure of the amount of solute that has been dissolved in a given amount of solvent or solution. A concentrated solution is one that has a relatively large amount of dissolved solute.

At 25°C

Kw = [H3O+][OH-] = 1.0 × 10-14

Given:

[H3O+] = 2.5 × 10-4 M

Substituting

2.5 × 10-4[OH-] = 1.0 × 10-14

[OH-] =4 × 10-11M

The concentration of hydroxide ions for an aqueous solution of acetic acid

[OH-] =4 × 10-11M

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The molar mass of the gas, given that 0.250 g of the gas is collected at 150.0 °C and 720 mmHg is 108.7 g/mol

First, we shall obtain the mole of the gas collected. This is shown below:

PV = nRT

0.947 × 0.085 = n × 0.0821 × 423

Divide both sides by (0.0821 × 423)

n = (0.947 × 0.085) / (0.0821 × 423)

n = 0.0023 mole

Finally, we shall obtain the molar mass of the gas. This is shown below:

Molar mass = mass / mole

Molar mass of gas = 0.250 / 0.0023

Molar mass of gas = 108.7 g/mol

Thus, the molar mass of the gas collected is 108.7 g/mol

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To determine the number of millimoles of HCl in 130 mL of a 10% solution, we need to calculate the amount of HCl in grams and then convert it to millimoles using the molecular weight.

First, let's find the amount of HCl in grams. The 10% solution means that 10 g of HCl is present in 100 mL of the solution. Therefore, in 130 mL, we can calculate the amount of HCl as (10 g/100 mL) * 130 mL = 13 g. Next, we convert the mass of HCl to millimoles using the molecular weight. The molecular weight of HCl is 36.5 g/mol. To convert grams to millimoles, we divide the mass by the molecular weight. So, (13 g) / (36.5 g/mol) = 0.356 millimoles. Therefore, there are approximately 0.356 millimoles of HCl in 130 mL of a 10% solution.

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Answer: To efficiently communicate with others

Explanation:

this was the right on answer for me might be different for others

The main need or want the wave technology shown meets to see objects surrounding more clearly.

It is a floating device that operates in the same direction as the waves. With the use of the technology, energy may be captured even from relatively small waves. The device that is moved by waves activates a hydraulic system that can power a generator. The tube segment contains all the generation equipment and systems.

Early mechanization (1770s to 1830s), steam power and railroads (1830s to 1880s), electrical and heavy engineering (1880s to 1930s), Fordist mass production (1930s to 1970s), and information and communication are the five waves that have so far slammed into our society (1970s to 2010s).

Wave energy, also known as wave power, is the energy that ocean surface waves carry and absorb. The energy is then put to use in a variety of productive ways.

Thus, The main need or want the wave technology shown meets to see objects surrounding more clearly.

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Answer:

1) F. harmful gases and solid particles that enter the atmosphere

2) C. pollutant gases react with water vapor

3) B. mixture of smoke, gas, and fog

4) E. sunlight interacts with pollutant gases

5) A. gradual increase in the overall temperature of the earth

6) D. gases are trapped by heat and raise the temperature of the atmosphere

hope this helps

Answer:

8/ 13

Explanation:

.................................

The set of nodal tissue known as the sinoatrial (SA) node would have the slowest inherent rate.

The sinoatrial (SA) node, located in the right atrium of the heart, is often referred to as the "natural pacemaker" of the heart. It initiates the electrical signals that regulate the heartbeat.

The SA node has the slowest inherent rate among the nodal tissues, typically generating electrical impulses at a rate of around 60-100 beats per minute in a healthy individual at rest.

This slower rate allows for coordinated contraction and relaxation of the heart chambers, ensuring efficient blood flow throughout the body. The slower inherent rate of the SA node is important for maintaining the proper rhythm and function of the heart.

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Answer:

Water is the answer

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Secondary consumers are organisms that primarily feed on herbivores or other primary consumers.

They occupy the next trophic level above the primary consumers in a food web. They obtain energy by consuming the primary consumers and play an important role in regulating the population of herbivores.

Examples of commonly observed secondary consumers include:

Carnivorous mammals: Animals such as wolves, lions, and tigers that feed on herbivores like deer, zebras, or gazelles.

Birds of prey: Species like eagles, hawks, and owls that consume small mammals, reptiles, or other birds.

Carnivorous fish: Fish like pike, barracuda, or bass that prey on smaller fish or aquatic invertebrates.

Predatory insects: Insects such as spiders, mantises, or dragonflies that feed on other insects, including herbivorous insects.

In a specific food web, the identification of secondary consumers would depend on the specific organisms present and their feeding interactions. It would be necessary to analyze the trophic relationships among the organisms in the food web to determine the secondary consumers accurately.

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The reaction A + B + 210 → C can be categorized as a combination reaction.

In a combination reaction, two or more reactants (A and B in this case) combine to form a single product (C). The number 210 could be a typo or an irrelevant part of the equation, as it does not fit the standard chemical notation.

Based on the information you provided, the reaction can still be categorized as a combination reaction. In a combination reaction, two or more reactants combine to form a single product.

In this case, reactants A and B react together to produce product C. However, without further information or a corrected equation, it is not possible to provide specific details about the reaction or the substances involved.

If you have any additional information or a revised equation, please provide it, and I would be happy to assist you further.

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Answer:

36 eggs

Explanation:

12 eggs in each carton

12 + 12 + 12 = 36 eggs

or 3 * 12 = 36 eggs

Hope this helps, have a nice day/night! :D

To determine the amount of reactant used in grams and moles, as well as the product obtained in grams and moles, the reaction equation and stoichiometry of the reaction are essential.

The theoretical yield of the product can be calculated based on the balanced equation and the stoichiometry, while the percent yield is calculated by dividing the actual yield by the theoretical yield and multiplying by 100%.

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It is a true statement that; "helical segments of protein molecules arise through hydrogen bonding between C = O and N-H groups."

We know that the hydrogen bond has to do with the kind of bond that exists any time that hydrogen has been bonded to yet another atom that is highly electronegative. This would cause the electron pair of the bond between the hydrogen atom and that atom to move nearer to the nucleus of that atom then the nucleus of hydrogen. The electronegative atom is then partially negatively charged while the hydrogen atom is partially positively charged.4

We know that proteins are composed of the amino acids and these amino acids do have the carbonyl and the amino groups. This could lead to the existence of the hydrogen bond. It is this hydrogen bond that accounts for the helical segments of protein molecules.

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Answer:Heat Q flows into a monatomic ideal gas, and the volume increases while the pressure is kept constant. What fraction of the heat energy is used to do the expansion work of the gas. The answer given by the book is 25.

Explanation:

Chemical chemical X. The silicon is available. This information is not given here. Therefore, we shall use the atomic number as the amount of protons. So, the solution is 17.

A proton, a quasiparticle, is found in the nucleus of every atom.. The particle has an electrical charge that is positive and opposite to the electron's. A single proton would weigh just 1.673? 10-27 kilos if it were isolated, which is only a little bit less than a neutron.

A subatomic particle with a negative charge is an electron. A proton is an unit of matter with the a positive charge. Protons are bound together in an atom's nucleus by the potent nuclear energy. The neutron is a type of subatomic particle sans charge (they are neutral).

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Emerging scientific ideas are new theories or ideas that are gaining attention in the scientific community, but have not yet been fully accepted or confirmed.

Emerging ideas refer to the new and innovative ideas or theories that have yet to gain full scientific acceptance. While a scientific consensus is a view or theory that has been universally accepted and confirmed by multiple experiments or research, an emerging scientific idea is a new and unproven theory or idea that is gaining attention in the scientific community. These emerging ideas may also be referred to as scientific hypotheses. In contrast to scientific consensus, emerging scientific ideas have not yet been subjected to rigorous testing and confirmation.

They are generally proposed to explain new observations or experimental results, which have not yet been fully understood or explained by established scientific theories. Emerging scientific ideas can have the potential to challenge the current scientific consensus. If an emerging scientific idea is found to be valid, it can ultimately lead to the establishment of a new scientific consensus. For example, the emerging scientific idea of the Higgs boson particle led to the discovery of a new field in particle physics, which is now an established scientific consensus.

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A)If 0.863 mole of \(NH_3\) are produced, 0.4315 moles of \(N_2\) must have reacted and B) If 0.863 mol \(NH_3\) are produced, 1.2945 mole of \(H_2\) must have reacted.

A) To determine the moles of \(N_2\) that reacted, we can use the stoichiometric coefficients from the balanced chemical equation: \(N_2 (g) + 3 H_2 (g) --> 2 NH_3 (g)\)
According to the balanced equation, 1 mol of \(N_2\) reacts to produce 2 mol of  \(NH_3\). To find the moles of \(N_2\) that reacted to produce 0.863 mol \(NH_3\), we can set up a proportion:
(1 mol \(N_2\) / 2 mol  \(NH_3\)) = (x mol \(N_2\) / 0.863 mol \(NH_3\))
Solving for x:
x mol \(N_2\) = (1 mol \(N_2\) / 2 mol  \(NH_3\)) * 0.863 mol  \(NH_3\)
x mol \(N_2\) = 0.4315 mol \(N_2\)
So, 0.4315 mol \(N_2\) must have reacted.
B) Now, to determine the moles of \(H_2\) that reacted, we can use the stoichiometric coefficients again:
According to the balanced equation, 3 mol of \(H_2\) reacts to produce 2 mol of  \(NH_3\). To find the moles of \(H_2\) that reacted to produce 0.863 mol  \(NH_3\), we can set up another proportion:
(3 mol \(H_2\) / 2 mol  \(NH_3\)) = (y mol \(H_2\) / 0.863 mol  \(NH_3\))
Solving for y:
y mol \(H_2\) = (3 mol \(H_2\) / 2 mol  \(NH_3\)) * 0.863 mol  \(NH_3\)
y mol \(H_2\) = 1.2945 mol \(H_2\)
So, 1.2945 mol \(H_2\) must have reacted.

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Answer:  " 13.5 g Al " ;

                    →  that is:  "13.5 grams of aluminum."

____________________________

Explanation:

____________________________

Note: What is missing from the question is the "balanced chemical equation" for the "chemical reaction" that contains:

 The reactants:  "aluminum (Al) " ;  and "chlorine (Cl) " ;  and:

 The product:    "aluminum choloride (AlCl₃) " .

____________________________

The "balanced chemical equation" is:

____________________________

        2 Al   +   3 Cl₂   →   2 AlCl₃   ;

_____________________________

Note: The molecular weight of "aluminum (Al)" is:   " 26.98 g /mol " .

____________________________

So:  We call solve using a technique known as:  "dimensional analysis" :

____________________________

  0.500 mol AlCl₃ * \((\frac{2mol Al}{2mol AlCl_{3} }) * (\frac{26.98g Al}{1 mol Al}) = ?\)

____________________________

Note:  The units of "mol AlCl₃" cancel out to "1' ; and:

          The  units of "mol Al" cancel out to "1" ; and we are left with:

____________________________

 " \(\frac{(0.500 * 2 * 26.98)}{2}\)   g Al ["grams of aluminum"] ;

____________________________

Note: We can "cancel out the "2's" ; since "2/2 = 1 " ; and we have:

 →  (0.500 * 26.98) g Al ;

    = 13.49 g Al ;

         →  Round to 3 (Three) significant figures;

         →  Since:  "0.500" has 3 (Three) significant figures:

____________________________

   =  13.5 g Al ; that is:  "13.5 grams of aluminum."

____________________________

 Hope this is helpful!  

      Best wishes to you in your academic pursuits—and within the "Brainly" community!

____________________________

Answer:

Photoelectric, Threshold

Explanation:

Your welcome

Answer:

a. 21.7824 g

b. 0.2362 g

c. 31.5273 g

Please see the answers in the picture attached below.

Explanation:

Please see the step-by-step solution in the picture attached below.

Hope this answer can help you. Have a nice day!

The mass of solute required in each case can be obtained form the stoichiometry of the reaction.

We know that the mass of each solution can be obtained from the relation;

mass/molar mass = concentration × volume

mass = concentration × volume × molar mass

a)

mass =  0.125 M  ×  1.00 L ×  174 g/mol = 21.75 g

b) mass = 0.015 M  × 375 /1000 × 42 g/mol = 0.24 g

c) mass = 0.350 M × 500/1000 × 180 g/mol =31.5 g

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The pH of milk is approximately 6.6.

The formula for calculating pH is:

pH = -log[H+]

Given that [H+] of milk is about 2.51 × 10–7, we can substitute this value into the formula to calculate the pH:

pH = -log(2.51 × 10–7)

pH = -(-6.6)

pH = 6.6

Therefore, the pH of milk is approximately 6.6.

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Pure elements has Gibbs free energy equal to 0.

The Gibbs free energy is a concept in chemistry specially of thermodynamics. The maximum amount of work that can be accomplished at a constant temperature and pressure by a closed system can be calculated using the Gibbs free energy (also known as Gibbs energy; symbol: denoted as delta G). Additionally, it offers a prerequisite for any processes like chemical reactions that might take place in such circumstances.

When a system achieves equilibrium without being pushed by an input electrolytic voltage, the Gibbs energy is the thermodynamic potential that is reduced. At the equilibrium point, its derivative w.r.t. the system's reaction coordinate vanishes.

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