1. What does each unit on the y-axis
represent?
A. the number of individuals in a sea otter population
B. the breeding season
C. total area in which a population lives
D. mortality rates

Answer:

my sources say that there is a lot of empty space between then

Explanation:

their forces to attract each other is not strong

kinetic energy is always high in gasses

The mass of barium in 288 mg of barium arsenate (Ba3(AsO4)2) is approximately 0.462 mg.

The molar mass of Ba3(AsO4)2 can be calculated by summing the atomic masses of each element in the compound. The atomic masses are as follows:

Barium (Ba): 137.33 g/mol

Arsenic (As): 74.92 g/mol

Oxygen (O): 16.00 g/mol

Molar mass of Ba3(AsO4)2:

= (3 * 137.33 g/mol) + (2 * (74.92 g/mol + 4 * 16.00 g/mol))

= 411.99 g/mol + 207.84 g/mol

= 619.83 g/mol

Now, we can calculate the mass of barium in 288 mg of barium arsenate using the molar mass and the given mass.

Mass of barium:

= (mass of barium arsenate / molar mass of barium arsenate) * molar mass of barium

= (288 mg / 619.83 g/mol) * 411.99 g/mol

= 0.462 mg

The mass of barium in 288 mg of barium arsenate (Ba3(AsO4)2) is approximately 0.462 mg.

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The major reaction pathway for the given reaction, which involves bromine (Br), potassium iodide (KI), and acetone as the solvent, is the S_N2 (bimolecular nucleophilic substitution) pathway. In this reaction, iodide ion (I-) from KI acts as a nucleophile and displaces the bromide ion (Br-) from the substrate. Acetone, as a polar aprotic solvent, helps stabilize the transition state and promotes the S_N2 mechanism. The S_N2 pathway is favored over E2, S_N1, and E1 due to the better nucleophilicity of the iodide ion and the solvent choice.

The major reaction pathway for the given reaction is the Sn2 mechanism. This is because the reaction is taking place in acetone, which is a polar aprotic solvent. This type of solvent favors the Sn2 mechanism as it helps to stabilize the transition state by solvating the nucleophile and leaving group. Additionally, the reagents used (Br and KI) are both good leaving groups, which also supports the Sn2 pathway. The E2 mechanism can be ruled out because there is no strong base present, and the Sn1 mechanism is unlikely because it requires a carbocation intermediate, which is not formed under these conditions.
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Answer:

NaOH

Explanation:

Sodium hydroxide is the base in the acid-base reaction as all other acids and sodium chloride is salt and water is neutral.

According to the Arrhenius concept, base is defined as a substance which yields hydroxyl ions on dissociation.These ions react with the hydrogen ions of acids to produce salt in an acid-base reaction.

Bases have a pH higher than seven as they yield hydroxyl ions on dissociation.They are soapy in touch and have a bitter taste.According to the Lowry-Bronsted concept, base is defined as a substance which accepts protons .Base react violently with acids to produce salts .Aqueous solutions of bases can be used to conduct electricity .They can also be used as indicators in acid-base titrations.

They are used in the manufacture of soaps,paper, bleaching powder.Calcium hydroxide ,a base is used to clean sulfur dioxide gas while magnesium hydroxide can be used as an antacid to cure acidity.

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A single water molecule (H-O-H) is held together by covalent bonds.

In a water molecule, one oxygen atom is bonded to two hydrogen atoms. These atoms are held together by covalent bonds, which involve the sharing of electrons between the atoms. Specifically, the oxygen atom shares one electron with each of the hydrogen atoms, and each hydrogen atom shares one electron with the oxygen atom. This sharing of electrons allows each atom to have a stable electron configuration, forming a strong and stable bond.

The resulting molecule has a bent shape, with an angle of approximately 104.5 degrees between the hydrogen-oxygen-hydrogen atoms. This shape contributes to the unique properties of water, such as its polarity and hydrogen bonding capabilities.

Additionally, water molecules have a dipole moment, meaning they have a slight positive and negative charge, allowing them to interact with other polar molecules. Overall, the structure and properties of the water molecule play a crucial role in its importance for life and the environment.

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The concentrations of Pb₂+ and Cu₂+ when the cell potential falls to 0.35 V are 0.0147 M and 1.5 M, respectively.

To solve this problem, we can use the Nernst equation, which relates the standard cell potential to the concentrations of the species involved in the cell reaction. The Nernst equation is given by:

E = E° - (RT/nF) * ln(Q)

where:

E is the cell potential

E° is the standard cell potential

R is the gas constant (8.314 J/mol·K)

T is the temperature in kelvin

n is the number of electrons transferred in the cell reaction

F is Faraday's constant (96,485 C/mol)

For the given voltaic cell, the half-cell reactions and their standard reduction potentials are:

Pb₂+ + 2e- → Pb(s) E° = -0.13 V

Cu₂+ + 2e- → Cu(s) E° = +0.34 V

The overall cell reaction is:

Pb(s) + Cu₂+ → Pb₂+ + Cu(s)

The cell potential can be calculated as:

E = E° - (RT/nF) * ln(Q)

We are given that the initial concentrations of Pb₂+ and Cu₂+ are 0.05 M and 1.5 M, respectively. Therefore, the reaction quotient is:

Q = [Pb₂+]/[Cu₂+] = 0.05/1.5 = 0.0333

At this point, we do not know the cell potential, but we are told that it falls to 0.35 V. We can use this information to solve for the final concentrations of Pb2+ and Cu2+. Rearranging the Nernst equation, we get:

ln(Q) = (E° - E) * (nF/RT)

Substituting the given values, we get:

ln(0.0333) = (-0.13 - 0.34 - 0.035) * (2 * 96,485 / (8.314 * 298))

Solving for E, we get:

E = 0.035 V

Substituting this value back into the Nernst equation, we can solve for the final concentrations of Pb2+ and Cu2+:

E = E° - (RT/nF) * ln(Q)

0.035 = -0.13 - 0.34 - (2 * 96,485 / (8.314 * 298)) * ln([Pb₂+]/[Cu₂+])

Solving for [Pb₂+]/[Cu₂+], we get:

[Pb₂+]/[Cu₂+] = exp(-(0.035 + 0.13 + 0.34) * (8.314 * 298) / (2 * 96,485)) = 0.0098

Multiplying both sides by [Cu₂+], we get:

[Pb₂+] = 0.0098 * [Cu₂+] = 0.0098 * 1.5 = 0.0147 M

Therefore, the concentrations of Pb2+ and Cu2+ when the cell potential falls to 0.35 V are 0.0147 M and 1.5 M, respectively.

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The correct option is option (iii) triple< double< single. The polarity of a bond refers to the separation of charge between the atoms forming the bond. Polarity arises from the difference in electronegativity between two atoms. Carbon and nitrogen both are nonmetals and belong to the same group in the periodic table.

They have almost the same electronegativity. Therefore, the polarity of carbon-nitrogen bonds can be analyzed based on bond length. Shorter the bond length, greater is the polarity of the bond.As the number of bonds between carbon and nitrogen increases, the bond length decreases, which in turn increases the polarity of the bond. The triple bond is the shortest and hence the most polar bond, followed by double and single bonds. Hence, the correct option is (iii) triple< double< single.

The carbon-nitrogen bonds can be of single, double or triple bond. The polarity of a bond depends on the electronegativity difference between the two atoms that form the bond. Carbon and nitrogen belong to the same group in the periodic table and have almost the same electronegativity.

The bond polarity can be determined by the bond length. If the bond length is shorter, then it is more polar. The order of polarity of carbon-nitrogen bonds can be predicted by looking at the number of bonds between the two atoms.The triple bond has the shortest bond length and the highest polarity among the three bonds. The triple bond consists of three sigma bonds and one pi bond. The bond strength of the triple bond is also the strongest among the three bonds. The double bond is the second in polarity, and it has a higher bond strength than the single bond. The double bond consists of one sigma bond and one pi bond. The single bond has the longest bond length and the weakest polarity among the three bonds. The single bond consists of one sigma bond.

The order of increasing polarity of carbon-nitrogen bonds is triple bond < double bond < single bond. The polarity of the bond has a significant impact on the physical and chemical properties of the compound. The triple bond between carbon and nitrogen is the most polar, followed by the double bond, and the single bond has the least polarity.

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Answer:

Think of each polar bond in a molecule as a little arrow pointing from positive to negative. This tells us that the bond dipole is a vector quantity. Like any other vector quantity, the direction is a vital aspect of its description. So, the geometry of the molecule determines the direction that the bond dipole vectors point. The polarity of the molecule results from adding up all these individual bond dipoles.

Explanation:

Hope this helped Mark BRAINLIEST!!!

what grade is this for?

Explanation:

4.01 x 1012 grammes of beryllium contain 4.45 x 1011 moles of beryllium. The chemical element beryllium has the atomic number 4 and the letter Be assigned to it. Alkaline earth metal is brittle, steel-gray, strong, and light.

The formula: can be used to determine how many moles of a material there are.

Molar mass divided by mass equals a mole.

Beryllium has a molar mass of 9.012 g/mol.

Therefore, we can perform the following calculation to determine how many moles of beryllium there are in 4.01 x 1012 grammes of beryllium:

4.01 x 10-12 grammes are equal to 9.012 grammes per mole.

4.45 x 1011 moles are one mole.

Therefore, 4.01 x 1012 grammes of eryllium contain 4.45 x 1011 moles of eryllium.

Note that both numbers must have the same exponent when writing in scientific notation, and that you must use a calculator to perform the calculation if you don't want to receive the wrong answer.

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Answer:

Explanation:

given amount of salt at time t is A(t)

initial amount of salt =300 gm =0.3kg

=>A(0)=0.3

rate of salt inflow =5*0.4= 2 kg/min

rate of salt out flow =5*A/(200)=A/40

rate of change of salt at time t , dA/dt= rate of salt inflow- ratew of salt outflow

\(dA/dt=2-(A/40)\\\\dA=2dt-(A/40)dt\\\\dA+(A/40)dt=2dt\)

integrating factor

\(=e^{\int\limits (1/40) \, dt}\)

integrating factor \(=e^{(1/40)t}\)

multiply on both sides by  \(=e^{(1/40)t}\)

\(dAe^{(1/40)t}+(A/40)e^{(1/40)t} dt =2e^{(1/40)t}t\\\\(Ae^{(1/40)t})=2e^{(1/40)t}t\)

integrate on both sides

\(\int\limits(Ae^{(1/40)t})=\int\limits2e^{(1/40)t}dt\\\\(Ae^{(1/40)t})=2*40e^{(1/40)t}+C\\\\A=80+(C/e^{(1/40)t})\\\\A(0)=0.3\\\\0.3=80+(C/e^{(1/40)t}^*^0)\\\\0.3=80+(C/1)\\\\C=0.3-80\\\\C=-79.7\\\\A(t)=80-(79.7/e^{(1/40)t})\)

b)

after long period of time means t - > ∞

\({t \to \infty}\\\\ \lim_{t \to \infty} A_t \\\\ \lim_{t \to \infty} (80)-(79/{e^{(1/40)t}}\\\\=80-(0)\\\\=80\)

Answer: a-f

b-t

c-t

Explanation:

Answer:

0.202M

Explanation:

you will want to use C₁V₁=C₂V₂ to solve for this.

C₁ is the initial concentration, in this problem it is .458 mol/L or M

V₁ is the initial volume, so it will be the 22.0 mL or 0.0220L

C₂ is the new concentration but here it is unknown.

V₂ is the new volume which is 50.0 mL or 0.0500L.

1. So now we plug this information in to the equation:

\((.458 mol/l)(0.0220L)=(C_{2} )(0.0500L)\)

2. We then do algebra to get C₂ alone:

\(C_{2} =\frac{(.458 mol/L)(0.0220L)}{(0.0500L)} =0.20152 mol/L or M\)

The liters cancel out and take note of the significant figures, there are 3 digits in all numbers in the question, so that means your answer must contain 3 sig figs. The answer 0.0202 rounded.

** instead of converting the mL to L you can also just keep them mL since they will be crossed out anyway. You will still get the correct answer.

Hope this help you! good luck :)

1. 92 g

2. 5.4 g

3. 0.217 moles

The mole is the number of particles(molecules, atoms, ions) contained in a substance  

1 mol = 6.02.10²³ particles

Can be formulated

N=n x No

N = number of particles

n = mol

No = Avogadro's = 6.02.10²³

Moles can also be determined from the amount of substance mass and its molar mass

\(\tt n=\dfrac{m}{MW}\)

1. the mass of 4 moles of Na(MW= 23 g/mol)

\(\tt mass=mol\times MW\\\\mass=4\times 23\\\\mass=92~g\)

2.  the mass of 0.3 moles of water(MW=18 g/mol)

\(\tt mass=mol\times MW\\\\mass=0.3\times 18\\\\mass=5.4~g\)

3. the number of moles found in 10g of ethanol C2H5OH(MW=46 g/mol) :

\(\tt mol=\dfrac{10}{46}\\\\mol=0.217\)

The maximum number of electrons that may occupy the third electron energy level (n=3) is 18.

Electrons are present in the electron shells or energy levels surrounding the atomic nucleus.

The electrons closest to the nucleus, in the first energy level or shell, have the lowest energy.

Electrons further from the nucleus have more energy and are found in higher energy levels or shells.

The electron configuration of each element indicates the number of electrons present in each energy level or shell.

There is a maximum number of electrons that each energy level or shell can hold.

According to the Aufbau principle and the Pauli exclusion principle, the maximum number of electrons that can occupy the third energy level is 18.

This level has three sublevels or orbitals: s, p, and d.

The s sublevel can hold up to 2 electrons, the p sublevel can hold up to 6 electrons, and the d sublevel can hold up to 10 electrons.

So, the total maximum number of electrons that can occupy the third energy level (n=3) is 2 + 6 + 10 = 18.

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The voltage is the potential difference between the two ends of the conductor. The factor that does not affect the voltage produced in a voltaic cell is pressure. The correct option is B.

A voltaic cell uses a chemical reaction to convert electrochemical energy to electrical energy. It consists of cathode and ions which flow through the cathode and anode.

The pressure has nothing to do with the Electrochemical devices.

The factor does not influence the voltage produced in a voltaic cell is pressure. The correct option is B.

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Answer:

B

Explanation:

cool air never rises so not A

C would mean its getting warmer

and heat flows from warm to cool so not D

we are left with B

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Answer:

Elements can be chemically combined into compounds, therefore, a compound consists of two or more elements combined, in definite proportions, by chemical means. Compounds may be formed by combining atoms of their constituent elements by ionic bonds or by covalent bonds.

A redox reaction is when there is simultaneous oxidation and reduction. CuO+H2→Cu+H2O. Example: In this reaction, hydrogen is oxidised to water while copper oxide is reduced to copper.

By assuming that all bindings to the atoms in molecules are ionic, we can use the oxidation numbers assigned to atoms in molecules to detect redox reactions. In a reaction, oxidation is shown by an increase in the number of oxidations, and reduction is indicated by a copper. Consider the sodium-water reaction. In this reaction, sodium removes hydrogen from water while both becoming oxidised by obtaining oxygen and reducing the water to hydrogen by removing oxygen at the same time.

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Answer:3

Explanation:

Answer:3

Explanation:

Answer:

b

Explanation:

Answer:

B) 4,1,2,3

Explanation:

Did it on USA Test prep. :)

Answer:

1 atmospheric pressure = 760.0 mm Hg

Thus 580 mm Hg = (580 mm Hg/(760 mm Hg/atm))

= 0.763 atm

Answer:

300

Explanation:

at least 300 molecules

Answer:

191.11 grams of oxygen gas should be produced.

Explanation:

The balanced reaction is:

2 Al₂O₃ → 4 Al + 3 O₂

By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

Being the molar mass of each compound:

By reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

Then you can apply the following rule of three: if by stoichiometry 108 grams of aluminum are produced along with 96 grams of oxygen, 215 grams of aluminum are produced along with how much mass of oxygen?

\(mass of oxygen=\frac{215 grams of aluminum*96 grams of oxygen}{108grams of aluminum}\)

mass of oxygen= 191.11 grams

191.11 grams of oxygen gas should be produced.

Answer:

1.91×1021/6.023×10^23

Explanation:

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