Chemistry High School

How do phospholipids interact with water molecules? how do phospholipids interact with water molecules? phospholipids dissolve in water. phospholipids do not interact with water because water is polar and lipids are nonpolar. the polar heads interact with water; the nonpolar tails do not. the polar heads avoid water; the nonpolar tails attract water (because water is polar and opposites attract)?

Answers

Answer 1

Answer:

the phosphate head mixes with water ;the fatty acid tails do not

Explanation:

Related Questions

How many carbon atoms are in 15.6 kg of acetone? acetone is ch3coch3. the density of acetone is 1.30 g/ml?

Answers

Answer is: 4,859·10²⁶ atoms of carbon.
m(CH₃COCH₃) = 15,6 kg · 1000 g/kg = 15600 g.
n(CH₃COCH₃) = m(CH₃COCH₃) ÷ M(CH₃COCH₃).
n(CH₃COCH₃) = 15600 g ÷ 58 g/mol.
n(CH₃COCH₃) = 268,965 mol.
N(CH₃COCH₃) = n(CH₃COCH₃) · Na.
N(CH₃COCH₃) = 268,965 mol · 6,022·10²³ 1/mol.
N(CH₃COCH₃) = 1,619·10²⁶.
There is three atoms of carbon in one molecule of acetone, so:
n(C) = 3 · 1,619·10²⁶ = 4,859·10²⁶.

15.6 kg is equivalent to 15600 g
The molar mass of acetone is 58 g/mole
Therefore; 15600/58 = 269 moles
1 mole of acetone contains 3 × 6.022 × 10^23 atoms
Therefore, 269 moles of acetone would contain;
269 × 3× 6.022 ×10^23 atoms
= 4.86 ×10^26 atoms of carbon

When will the net enthalpy of formation of a solution (δhsolution) be endothermic?

Answers

Answer is: it can be endothermic when the amount of energy needed to break the intermolecular forces in the solute is larger than the amount of energy given off by formation of intermolecular forces in the mixture, so solution must be heated.
In ideal solution the forces of attraction between the solute-solute and the solvent-solvent and solute-solvent molecules are the same.

I'm a really stuck in this. I kind of suck in chemistry, please help me. I would really appreciate it.

I have to write one to two paragraphs about : What is the relationship between the atomic numbers and ionic radii of the elements in group 1?

And

What is the relationship between atomic numbers and first ionization energies?

These Are The Elements in group 1 of the periodic table:

lithium
sodium
potassium
rubidium
cesium

Answers

Group 1 can be characterized as atoms that have 1 electron in their valence shell. This is valuable when dealing with these questions, because the loss or gain of valence electrons is what defines ionic relationships. When group 1 elements form ionic bonds with other atoms, they are extremely likely to lose their valence electron, since the nucleus has a weaker pull on it than, say, a chlorine atom has on its 7 valence electrons. The weaker pull between the nucleus and the valence electron of group 1 elements means that the radius is high, since the electron is more free to move with less pull on it. This also means that the first ionization energy is low, since it takes relatively little energy for that electron to be pulled away to another atom.

Braddy connected the lose wire to the battery and created an electromagnet. He picked up 45 thumb tacks with his electromagnet, though his goal was to pick up 50 thumb tacks. What could Braddy do to increase the strength of his electromagnet and pick up more thumbtacks?
A) Use fewer coils of wire.
B) Use a screw instead of a nail.
C) Use two batteries instead of one.
D) Replace the nail with a piece of steel.

Answers

In order to increase the strength of his electromagnet and pick up more thumbtacks Braddy should use two batteries instead of one. Using two batteries will increase the amount of current in the coils which will induce a higher electromagnetic field in the nail.
Another option would be to increase the number of coils of wire.

Braddy could use two batteries instead of one. One way he could increase the strength of his magnet is to increase the current and add a second battery. He could also add more coils of wire, not use fewer.

You mix sugar in water and stir until it's completely dissolved. in this system, the water is the ________, the sugar is the ________, and the end result is a ________. solute; solution; solvent solvent; solution; solute solution; solvent; solute solvent; solute; solution solute; solvent; solution

Answers

A solution is a homogenous mixture of two or more substances. A solute is a substance that dissolves. A solvent is a substance in which other substances dissolve in. Using these definitions above the answer will hence be choice number 4. solvent;solute;solution.

Answer: water is the solvet, sugar is the solute and the the end result is a solution.

Explanation:

Binary Solution is a homogeneous mixture of two components called as solute and solvent.

Solute is the component which is present in smaller proportion and is solid for solid in liquid solution and solvent is the component which is present in larger proportion and is liquid for solid in liquid solution.

Concentrated solution is one in which there is more amount of solid.

Dilute solution is one in which there is more amount of liquid.

Thus as sugar is lesser in amount , it is the solute. Water is preset in larger amount, thus it is the solvent and the end result is the solution.

What is the approximate total number of atoms in a 1.0 mole of lithium?

Answers

To solve the problem we will use the following equation:

n(Li) = N(Li) / NA

n - the number of moles

N - the number of particles

NA - Avogadro's number that has following value: 6.022×10²³ mol⁻¹

From the upper relation follows:

N(Li) = n(Li) × NA

N(Li) = 1mole × 6.022×10²³ mol⁻¹ = 6.022×10²³ atoms of lithium

Answer:

6.0 × 10^23

Explanation:

Big brain mode

An element has three naturally occurring isotopes. Use the information below to calculate the weighted average atomic mass of the element, showing both the setup and the final answer for the calculation.

Isotope

Atomic Mass

Percent Abundance

X 1.01 u 99.984%

Y 2.01 u 0.014%

Z 3.02 u 0.002%

Answers

Weight average = 1.01 * 0.99984 + 2.01* 0.00014 + 3.02 * 0.00002

answer is 1 .0101802

What was the original element formed moments after the Big Bang? What then created higher order elements?

Answers

Final answer:

Hydrogen was the first element formed right after the Big Bang, followed by helium and a small amount of lithium during a period known as Big Bang nucleosynthesis. The heavier elements were created in the cores of stars or during supernovae much later in the universe's history. The CMB is evidence of the universe's early state when neutral hydrogen atoms first formed.

Explanation:

The original element formed moments after the Big Bang was hydrogen. After that, the processes that occurred in the early universe allowed for the fusion of hydrogen nuclei into helium and a small amount of lithium. This period of nucleosynthesis occurred within a few hundred seconds of the Big Bang. Heavier elements were created much later in the cores of stars and during supernova explosions.

During the first few minutes after the Big Bang, conditions were ripe for nuclear fusion due to the extremely high temperatures. Protons and neutrons combined to form deuterium (a stable isotope of hydrogen), which then fused into helium. Only about 5% of the current universe's ordinary matter was created during this brief period of Big Bang nucleosynthesis.

As the universe cooled and expanded, fusion became less viable and only the fusion within stars continued the process of creating heavier elements. The Cosmic Microwave Background (CMB) radiation that we observe today is a remnant from the time when the universe cooled enough for neutral hydrogen atoms to form, making the universe transparent to radiation again.

10,300 milliliters is the same as: cm3 and L

Answers

Answer : The 10300 milliliter in [tex]cm^3[/tex] and L are, [tex]10300 cm^3[/tex] and 10.3 L respectively.

Explanation :

The conversion used from milliliters to centimeter cube is:

[tex]1ml=1cm^3[/tex]

As we are given the volume 10300 ml. Now we have to determine the volume in centimeter cube.

As, [tex]1ml=1cm^3[/tex]

So, [tex]10300ml=\frac{10300ml}{1ml}\times 1cm^3=10300cm^3[/tex]

The volume in centimeter cube is, [tex]10300cm^3[/tex]

The conversion used from milliliters to liter is:

1 ml = 0.001 L

As we are given the volume 10300 ml. Now we have to determine the volume in liter.

As, 1 ml volume = 0.001 L

So, 10300 ml volume = [tex]\frac{10300ml}{1ml}\times 0.001L=10.3L[/tex]

The volume in liter is, 10.3 L

Answer:

The 10300 milliliter in and L are, and 10.3 L respectively.

Explanation:

Which are examples of dynamic equilibrium? Check all that apply.

A cooking pot left under a dripping faucet eventually fills with water and overflows.

A person's bank account balance remains constant because income and expenses are equal.

When a small amount of sugar is added to pure water, the sugar dissolves completely.

When humidity is high, the rate at which water evaporates from the surface of a puddle is the same as the rate at which water vapor condenses from the air, so the puddle's size does not change.

Sodium moves between many different compounds during chemical reactions on Earth, but the total amount of sodium on Earth is constant.

Answers

B, D, E
A person's bank account balance remains constant because income and expenses are equal.

When humidity is high, the rate at which water evaporates from the surface of a puddle is the same as the rate at which water vapor condenses from the air, so the puddle's size does not change.

Sodium moves between many different compounds during chemical reactions on Earth, but the total amount of sodium on Earth is constant.

B, D. and E are correct

Which of the following can be measured in amps with an ammeter

Answers

I believe it is current. An ammeter is a measuring instrument used to measure the current in a circuit. Electric currents are measured in amperes (A), hence the name. Instruments used to measure smaller currents, milliampere or microampere range, are designated as milliammeters or microammeters.

The equilibrium constant k for the synthesis of ammonia is 6.8x105 at 298 k. what will k be for the reaction at 375 k?

Answers

The value of K for the reaction at 375 k is : 326

Given data :

Initial temperature ( T1 ) = 298 k

rate constant ( k1 ) = 6.8 * 10⁵

Final temperature ( T2 ) = 375 k

Determine the value of K2

applying the relationship below

Log ( K₂ / K₁ ) = ΔH / 2.303 * R * ( T₂-T₁ / T₂T₁ ) ----- ( 1 )

equation ( 1 ) becomes

Log K₂ - log (6.8 * 10⁵ ) = - 7100940 / 213967725

Log K₂ - ( 5 + log 6.8 ) = - 3.318

therefore Log K₂ = 2.5145

K₂ = 10^2.5145

= 326

Hence we can conclude that The value of K for the reaction at 375 k is : 326

Learn more about equilibrium constant : https://brainly.com/question/12270624

Attached below is the complete question

Final answer:

The equilibrium constant K for the synthesis of ammonia changes with temperature, and to determine K at 375 K, the Van't Hoff equation should be used, which requires the standard enthalpy change of the reaction, ΔH°. Without ΔH°, the exact value of K at 375 K cannot be determined.

Explanation:

The equilibrium constant K for the synthesis of ammonia will vary with temperature due to the inherent properties of the reaction and the effect of temperature on reaction dynamics. In thermodynamics, the Van't Hoff equation relates the change in the equilibrium constant with temperature, which is described as:

ln(K2/K1) = -ΔH°/R * (1/T2 - 1/T1)

where:

K1 and K2 are the equilibrium constants at temperatures T1 and T2, respectively,ΔH° is the standard enthalpy change of the reaction,R is the universal gas constant, andT1 and T2 are the initial and final temperatures in Kelvin.

To determine K at 375 K, one would need the value of ΔH° for the reaction. In absence of this information, the question cannot be fully answered. However, generally a rise in temperature for an exothermic reaction, like the synthesis of ammonia, results in a lower equilibrium constant due to Le Chatelier's Principle.

Which of the following is NOT a characteristic of a strong acid and a strong base?

Has a [H+] higher than water

Completely dissociates in water

Has a pH at the extreme end of the scale

Is corrosive to most metals

Answers

The first one is the correct choice. We have that bases have [H+] lower than that of water since the product of H+ and OH- concentration in water is constant; in acids H+ are more than OH-, in bases H+ are less than OH- and in neutral PH (water) H+=OH- ; hence in bases OH->H+ . We have that strong bases and strong acids dissociate completely in water (by definition), their pHs are as much far from the middle of the pH scale (7) as possible (around 0 for acids or 14 for bases) and they corrode metals due to how drastic they are.

What are the properties of the aluminum in the can

Answers

the properties of aluminium include low density and therefore low weight, high strength, superior malleability, easy machining, excellent corrosion resistance and good thermal and electrical conductivity are amongst aluminium's most important properties. Aluminium is also very easy to recycle.
Hope this helps:D
Have a great rest of a brainly day!

An experiment is designed to test what color of light will activate a photoelectric cell the best. The photocell is set in a circuit that "clicks" in response to current. The faster the current, the more clicks per minute. In this experiment, the number of clicks in one minute is recorded for each color of light shining on the photocell. To change the color of light, a different color of cellophane is placed over the same flashlight and the flashlight is then located a specific distance from the photocell.

In the above experiment, which factor is the independent variable?
A)the number of clicks
B)the color of the light
C)the original source of the light
D)the photocell

Answers

The independent variable is the one we control changes in, which is B) the color of the light. The number of clicks (A) is the dependent variable, which we are measuring. The original source of the light (C) is something we control, but we do not change anything in it. Finally, the photocell (D) is just part of the setup, and we also do not change anything about it.

What are charged atoms of elements that have an unequal number of protons and electrons?

Answers

if the number of electron is more than the protons,the atom is negative
if the number of electrons is less than the protons, the atom will be positive

PLEASE HELP!!

1. Which of these is the balanced equation for this reaction?
A. V2O5 + HCl ? VOCl3 + H2O
B. V2O5 + HCl ? 2VOCl3 + 3H2O
C. V2O5 + 3HCl ? 2VOCl3 + H2O
D. V2O5 + 6HCl ? 2VOCl3 + 3H2O

2. __N2 + __O2 + __H2O ? __HNO3
What coefficient values will balance the reaction?
A. 2,5,2,4
B. 2,2,2,2
C. 2,2,1,2
D. 1,3,1,2

3.The chemical formula of a compound can tell you -
A. the proportions of elements in the compound.
B. the three-dimensional structure of the compound.
C. the type and arrangement of bonds in the compound.
D. the properties of the elements in the compound.

4.The reaction equation below shows the formation of aluminum oxide. Which set of coefficients balances the equation? Al + O2 ?Al2O3
A. 1,1,1
B. 2,3,5
C. 2,4,5
D. 4,3,2

5.Which of the following is the balanced equation for this process?
A.2NH4NO3? 2N2 + O2 + 4H2O
B.NH4NO3? N2 + 3O2 + H2O
C.2NH4NO3? N2 + O2 + 3H2O
D.2NH4NO3? N2 + 3O2 + 2H2O

Answers

1) The answer is D. V2O5 + 6HCl = 2VOCl3 + 3H2O.

V2O5 + HCl = VOCl3 + H2O

V=2 V=1
0=5 O=3
H=1 H=2
Cl=1 Cl=3

The equation is not balanced because on the left side there is 2 vanadium (V) atoms, 5 oxygen (O), 1 hydrogen (H) and 1 chlorine (Cl) atoms. In the right side, there is 1 vanadium (V) atom, 3 oxygen (O), 2 hydrogen and 3 chlorine (Cl) atoms.
To balance the chemical equation we need place a coefficient of 6 in front of HCl, a coefficient of 2 in front of VOCl3 and coefficient 3 of in front of H2O.

2) The answer is A. 2,5,2,4

2N2(g) + 5O2(g) + 2H2O = 4HNO3(aq)

This is a redox reaction because there has been a change in the oxidation states of nitrogen and oxygen, and it has to be balanced over half-reaction method:

N⁰ ⇒ N⁺⁵ + 5e⁻ / x2
2e⁻ + O⁰ ⇒ O⁻² / x5

2N⁰ ⇒ 2N⁺⁵ + 10e⁻
10e⁻ + 5O⁰ ⇒ 5O⁻²

Now it only remains to count how many hydrogens miss.

3) The chemical formula of a compound can tell you - A. the proportions of elements in the compound.

Chemical formulas are the symbols of chemical compounds, the form of displaying their molecules; in addition to the qualitative composition, they also show the quantitative ratio of the atoms constituting the molecule of the chemical compound. Formulas are expressed by chemical symbols; for example. molecules of the chemical compound of water are composed of two hydrogen atoms and one oxygen atom, so the molecular formula is H2O water.

4) The answer is D. 4,3,2.

4Al + 3O2 = 2Al2O3

This is a redox reaction because there has been a change in the oxidation states of aluminum and oxygen, and it has to be balanced over half-reaction method:

Al⁰ ⇒ Al⁺³ + 3e⁻ / x4
4e⁻ + O₂⁰ ⇒ 2O⁻² / x3

4Al⁰ ⇒ 4Al⁺³ + 12e⁻
12e⁻ + 3O₂⁰ ⇒ 6O⁻²

5) The answer is A. 2NH4NO3 = 2N2 + O2 + 4H2O

This is a redox reaction because there has been a change in the oxidation states of nitrogen and oxygen, and it has to be balanced over half-reaction method:

N⁺⁵ + 5 e⁻ ⇒ N⁰
N⁻³ ⇒ N⁰ + 3 e⁻
O⁻² ⇒ O⁰ + 2 e⁻

In the reaction, there are 2 species of nitrogen N⁺⁵ and N⁻³, the first is reduced and the second oxidized.

Why are graphs used to understand an objects motion?

Answers

Hello!

Graphs are used to understand an object's motion because they can show the exact location of the object at any given moment.

This is done with the help of a reference system. The most common reference system is the Cartesian coordinate system, which describes the location of an object through a set of 2 or 3 coordinates (depending if the system is in 2D or 3D).

Studying graphs of movement, we can know if the movement is cyclical, or the direction of the movement, determine tendencies and overall getting an unambiguous and precise understanding of the motion.

Have a good day!

Write the equilibrium-constant, kp, expression for the reaction a(g)+4b(l)<--------->3c(g)+d(g)

Answers

when Kp = (the partial pressure of the products raised to exponents equal to their respective coefficients in the equation) / (the partial pressure of the reactants raised to exponents equal to their respective coefficients in the equation).
Kp = [P(C)]^3] * [P(d)] / [P(A)]
we here neglected the B as it is in liquid state.and we here deal with gas states only.
So your final answer is Kp= [P(c)^3]*[P(d)]/[(p(A)]

Answer:

[tex]K_{p} =\frac{(P_{c} )^{3}(P_{d} ) }{(P_{a}) }[/tex]

Explanation:

The equilibrium constant is expressed as the relationship between the molar concentration of reagents and products. The expression of a generic reaction is:

aA + bB <--------> cC + dD

[tex]K_{p}=\frac{[C]^{c} [D]^{d} }{[A]^{a} [B]^{b}}[/tex]

The numerator is the product of the concentrations of the products and the denominator is the product of the reagents. Each term in the equation is raised to a power whose value is that of the stoichiometric coefficient in the balanced equation.

When it comes to gas mixtures, it is sometimes more appropriate to describe the composition in terms of partial pressures. So in this case we will have:

[tex]K_{p} =\frac{(P_{c} )^{3}(P_{d} ) }{(P_{a})(P_{b}) ^{4} }[/tex]

As the concentration and partial pressure of pure liquids and solids can be considered as 1, the final equation will be:

[tex]K_{p} =\frac{(P_{c}) ^{3}(P_{d} ) }{(P_{a}) } [/tex]

Use the periodic table to answer this question.

Sodium reacts with chlorine gas to form sodium chloride. 2Na + Cl2 → 2NaCl

What mass of chlorine gas will react with 92.0 g of sodium?

246 g Cl2

298 g Cl2

142 g Cl2

63 g Cl2

Answers

Answer is: mass of chlorine gas is 142 grams.
Chemical reaction: 2Na + Cl₂ → 2NaCl.
m(Na) = 92,0 g.
n(Na) = m(Na) ÷ M(Na).
n(Na) = 92 g ÷ 23 g/mol.
n(Na) = 4 mol.
From chemical reaction: n(Na) : n(Cl₂) = 2 : 1.
n(Cl₂) = 4 mol ÷ 2.
n(Cl₂) = 2 mol.
m(Cl₂) = 2 mol · 71 g/mol.
m(Cl₂) = 142 g.

Ga2O3(s) + 3SOCl2(l) --> 2GaCl3(s) +3SO2
In a certain reaction, 71.8 g of Ga2O3 is reacted with 110.8 g SOCl2.The GaCl3 produced is collected and its mass founded to be 97.66 g.
What is the theoretical yield of GaCl3?

Answers

The balanced equation is;
Ga2O3 + 3 SOCl2 → 2GaCl3 + 3SO2
the no. of moles of Ga2O3 = Weight / Molecular weight
= 71.8 / 187.44 = 0.383 moles >>> (1)
the no. of moles of SOCl2 = (Wt / M.wt) / 3 = (110.8/119)/3 = 0.310 moles >>> (2)
From (1) and (2),
∴ SOCl2 determines the yield of the reaction (lower no. of moles)
∴ No. of moles of GaCl3 = 0.310 * 2 = 0.620 moles >>> (3)
∴ the theoritical yield (weight in gram) of GaCl3 = no. of moles * M.wt.
= 0.620 * 176= 109.12 g

Which is not a hydrogenous sediment?

manganese nodules

calcium carbonates

evaporites

calcareous ooze

Answers

I believe Calcareous is not a hydrogenous sediment. Hydrogenous sediments are example of marine sediments that are formed directly from chemical processes in sea water. They include, manganese nodules, phophorites, metal sulfides, evaporites and carrbonates. In shallower areas, such as on continental shelves and near islands, rock salt, calcium salts and sulfates may settle on the ocean floor.

my answer is the letter D. calcareous ooze

Because calcareous ooze is a Biogenous sediment not a hydrogenous sediment

87 g of oxygen gas would occupy how many liters of volume at stp

Answers

number of mole : mass/ molar mass

87g/ (2 x 16) = 2.719 mol

volume = number of mole x molar volume
volume = 2.719 x 22.4
volume = 60.906 L

The periodic law describes trends seeing across which of the following?

Periods within the periodic table
Radio activity within the periodic table
Elements with the same number of protons
The top half of periodic table

Answers

A.) Periods within the periodic table. :)

what makes a nucleus stable

Answers

Unstable Nuclei. ... In summary, it is the balance of protons and neutrons in a nucleus which determines whether a nucleus will be stable or unstable. Too many neutrons or protons upset this balance disrupting the binding energy from the strong nuclear forces making the nucleus unstable.
Hope this helps:D
Have a great rest of a brainly day!
"*AB84*"

In summary, basically it is the balance of protons and neutrons in a nucleus which determines whether a nucleus will be stable or unstable.

(3) consider a the titration of 1.0 m sulfurous acid (h2so3, ka1 = 1.5e-2, ka2 = 1.0e-7) with 2.0 m naoh. what is the ph at the equivalence point of the titration?

Answers

Final answer:

The pH at the equivalence point of the titration of 1.0 M sulfurous acid (H2SO3) with 2.0 M NaOH is 7.08. The pH is slightly basic due to the hydrolysis of the resulting sulfite ion in water, which forms OH- ions.

Explanation:

The titration of 1.0 M

sulfurous acid

(H2SO3) with 2.0 M NaOH is a process in which a strong base (NaOH) neutralizes a weak acid (H2SO3). The result at equivalence point is not a neutral solution (pH 7); instead, it is slightly basic because the sulfite ion (SO3^2-) produced from the titration processes hydrolyzes water to produce hydroxide ions (OH-) and render the solution basic.

From the given Ka values (Ka1 = 1.5e-2 and Ka2 = 1.0e-7), we find that the second ionization can be ignored due to its low extent. When 1 mol of H2SO3 is neutralized by 1 mol of NaOH, a solution containing 1 M of SO3^2- is formed. This anion will react with water to generate hydroxide ions. SO3^2- + H2O ↔ HSO3^- + OH-, for which the Kb can be calculated as Kw/Ka1= [1.0e-14]/[1.5e-2] = 6.7x10^-13.

By solving the equilibrium expression Kb = [HSO3^-][OH-]/[SO3^2-], considering the initial concentration of SO3^2- as 1 M and the formation of equal amounts of HSO3^- and OH-, we find [OH-] = √(Kb)= 8.2x10^-7. Finally, using the relationship pOH = -log[OH-] and pH = 14 - pOH, we find that the pH at the equivalence point is 14 + log{8.2x10^-7} = 7.08.

Learn more about Titration here:

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The pH at the equivalence point of the titration of 1.0 M sulfurous acid (H₂SO₃) with 2.0 M sodium hydroxide (NaOH) is 7.00. The second dissociation constant of H₂SO₃ and the concentrations of HSO₃⁻ formed at the equivalence point.

The pH at the equivalence point of a titration involving 1.0 M sulfurous acid (H₂SO₃) with 2.0 M sodium hydroxide (NaOH), we need to follow these steps:

Identify the acid and base reactions: Sulfurous acid (H₂SO₃) has two dissociation constants (Ka1 = 1.5 × 10⁻² and Ka2 = 1.0 × 10⁻⁷), which means it is a diprotic acid undergoing two ionization steps: H₂SO₃ ⇌ H⁺ + HSO₃⁻ and HSO₃⁻ ⇌ H⁺ + SO₃²⁻.Calculate the moles of H₂SO₃ and NaOH: Given 1.0 M H₂SO₃ and 2.0 M NaOH, let's assume we use 1 L of H₂SO₃ and 0.5 L of NaOH to reach the equivalence point, meaning we have 1 mol H₂SO₃ neutralized by 1 mol NaOH.Determine the species present at equivalence point: At the first equivalence point, the solution mainly contains HSO₃⁻ as the product with a concentration of approximately 0.5 M due to the reaction H₂SO₃ + 2NaOH → NA₂SO₃ + 2H₂O.Calculate the pH: To find the pH, use the remaining concentration of HSO₃⁻ and the second dissociation constant (Ka2 = 1.0 × 10⁻⁷). Applying the Henderson-Hasselbalch equation: pH = pKa2 + log([HSO₃⁻]/[H₂SO₄]). Since [HSO₃⁻] ≈ 0.5 M and [H₂SO₄] ≈ 0, the contribution of HSO₃⁻ will dominate, simplifying the pH calculation to: pH = -log(1.0 × 10⁻⁷) = 7.00.

For an atom’s electrons, how many energy sublevels are present in the principal energy level n = 4? 4 9 10 16 32

Answers

I believe the answer is 32.
Hope that helps.

Answer: The number of sub-levels the for the energy level n = 4 are 4.

Explanation:

The number of sub-levels in an energy level is determined from the azimuthal quantum number.

Principle Quantum Number: This quantum number describes the size of the orbital. It is represented by n where n = 1,2,3,4....

Azimuthal Quantum Number: This quantum number describes the shape of the orbital and also determines the sub-levels in an energy level. It is represented by the symbol 'l'. The value of 'l' ranges from 0 to (n-1). For l = 0,1,2,3... the orbitals are s, p, d, f...

For n = 4, the value of l = 0(s), 1(p), 2(d), 3(f) and these are the number of sub-levels.

Hence, the number of sublevels the for the energy level n = 4 are 4.

In an experiment, an unknown gas effuses at one-half the speed of oxygen gas, which has a molar mass of 32 g/mol. which might be the unknown gas?

Answers

If we assume the rate of diffusion of oxygen is 1 , then that of the unknown gas is 1/2.
From the Grahams law of diffusion;
R1/R2= √mm2/√mm1
1/0.5 = √mm2/√32
4 = mm2/32
mm2 = 128
Therefore the molecular mass of the unknown gas i 128 g/mol
I therefore think the gas is Hydrogen iodide
since, H=1, I= 127 , thus HI = 128 g/mol

What mass due to waters of crystallization is present in a 3.38 g sample of FeSO4 •7H2O?

Answers

First, it is necessary to have the molar mass of FeSO4 • 7H2O and molar mass of compound without water FeSO4.

M(FeSO4 • 7H2O) = 54+32+(16x4)+7(2+16) = 276 g/mole

M(FeSO4) = 54+32+(16x4) = 150 g/mole

When the molar mass value of iron(II) sulfate heptahydrate is subtracted from the molar mass value of iron(II) sulfate we get the total molar mass of water in crystal:

M(H20) = M(FeSO4 • 7H2O) - M(FeSO4) = 276 - 150 = 126 g mole

Now we can determine how much water there are in 3.2 g of the crystal:

M(FeSO4 • 7H2O) : M(H20) = m(FeSO4 • 7H2O) : m(H20)

276 : 126 = 3.38 : x

x = 425.88 / 276 = 1.54 g of H2O

The mass due to water of crystallization present in a 3.38 g sample of FeSO4 •7H2O is 1.53 g

What is water of crystallization?

The water of crystallization is the moles of water present in one molecule of a salt which forms part of the crystal lattice.

For the given salt:

molar mass of salt FeSO4 •7H2O = 278 g/mol

mass of water on 1 mole FeSO4 •7H2O = 7 × 18 = 126 g

Mass due to waters of crystallization present in a 3.38 g sample of FeSO4 •7H2O = 3.38 × 126/278

Mass of water of crystallization = 1.53 g

Therefore, the mass due to water of crystallization present in a 3.38 g sample of FeSO4 •7H2O is 1.53 g.

Learn more about water of crystallization at: https://brainly.com/question/26146814

The proton pump _____. see concept 36.2 (page 786) the proton pump _____. see concept 36.2 (page 786) uses the energy stored in atp to produce a hydrogen ion gradient across membranes. uses the energy of a proton gradient to generate atp is a passive process operates by osmosis releases kinetic energy

Answers

Answer: uses the energy stored in atp to produce a hydrogen ion gradient across membranes

The proton pump is a membrane protein that could actively able to moves H+. This action will need energy since the movement is against the gradient of concentration. Like all other pumps, the energy source would be ATP. Proton pump has a role in acid secretion in human.

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