Which step is this ?prophase I, Anaphase I, prophase II, Anaphase II

Answer:

decreases

Explanation:

The higher the entropy, the more unpredictable and the more random a value is, this is because entropy describes disorder of a system. If things are less random, that means they are predictable, which means they are more ordered.

Answer:

5.12 L

Explanation:

P1V1/T1 = P2V2/T2

1.71 atm *10.0L /100 K = 9.70 atm *x/290.29 K

x = 1.71 atm *10.0L*290.29K /(100 K * 9.70 atm)= 5.12 L

Answer:

Well, for one thing,I played football for 7 years. Gatorade wouldn't be Gatorade without electrolytes. The electrolytes in that bottle of Gatorade give you energy. Those electrolytes Are what propel you through whatever you are doing at that time. Those are what give you energy.

Explanation:

Answer:

a. Raise the pH slightly

Explanation:

We know that

Pka of HNO2/KNO2 =3.39

Moles of HNO2 in the buffer=0.247 mol/L×1L=0.247 moles

Moles of NO2-=0.329mol/L×1L=0.329 moles

If 0.271 moles of Ca(OH)2 is added it will neutralise 0.136 moles of acid ,HNO2,remaining HNO2=0.247-0.136=0.111 moles

Moles of NO2- will increase as 0.0333 moles Ca(NO)2 will be formed =0.0333+0.036=0.0693 moles

pH=pka+log [base]/[acid]      {henderson -hasselbach equation}

=3.39+log (0.0693/0.0317)=3.39+0.34=3.73

pH=3.73

Answer:

Yes it is. 0.34 kg = 340 g (Kilograms and grams)

Explanation:

When we convert from kg to grams we multiply by 1000 because kilo mean 1000.

0.34*1000= 340

Answer:

The question lacks options, the options are:

A) Energy is transferred to consumers, which convert it to nitrogen and use it to make amino acid

B) Energy from producers is converted into oxygen and transformed to consumers.

C) Energy from the sun is stored by green plants and transferred to consumers.

D) Energy is transferred to consumers, which use it to produce food.

The answer is C

Explanation:

Organisms obtain energy in an ecosystem by feeding on one another in a chain called FOOD CHAIN. Energy is transferred when one organism feeds on another. A food chain always begins with a PRODUCER, which is an autotrophic organism capable of producing its own food via light energy from the sun.

In a terrestrial ecosystem, the energy a plant captures via Its Chlorophyll is used to produce food during photosynthesis. This energy is stored in the plants and transferred when a set of organisms called PRIMARY CONSUMER feeds on the plant. The transfer continues in that order till decomposers.

Answer:

The male cones appear on the trees in the spring time.  The male cones are smaller than the female cones that we typically think of when we think of pine cones.  These cones are softer and are only on the trees in the spring.  After they release their pollen they die away and disappear.

Explanation:

Answer:

2HCI + Na2S ----> H2S + 2NaCl

Explanation:

For a balanced chemical equation, the number of moles of atoms on the reaction side must equal the number of moles of atoms on the product side, in accordance with the law of conservation of mass.

The correct answer is:

2HCI + Na2S ----> H2S + 2NaCl

Since it has equal number of moles of each atom on both sides of the equation: 2 atoms each of hydrogen, chlorine, and sodium on both sides of the equation as well as 1 atom of sulphur on both sides of the equation.

Answer:

D. Ultraviolet light should have a short wavelength, not a long wavelength.

Explanation:

just took the quiz on Ed

The mistake Gino made is, ultraviolet light should have a short wavelength, not a long wavelength.

Electromagnetic spectrum is the arrangement of electromagnetic radiations in the order of increasing frequency or decreasing wavelength.

Examples electromagnetic radiations based on increasing wavelength  include;

Thus, the mistake Gino made is, ultraviolet light should have a short wavelength, not a long wavelength.

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Answer:

Van't Hoff factor of KBr is 1.63

Explanation:

Freezing point depression due the addition of a solute follows the formula:

ΔT = Kf×m×i

Where ΔT is change in freezing point, Kf is freezing point depression constant of the solvent X, m is molality of the solution (mol / kg) and i is Van't Hoff factor.

Moles of 177g of alanine (Molar mass: 89.09g/mol) are:

177g × (1mol / 89.09g) = 1.99 moles. In 0.800kg:

1.99mol / 0.800kg = 2.49m

Replacing in freezing point depression formula:

5.9°C = Kf×2.49m×1

Alinine has a Van't Hoff factor of 1

The Kf of the solvent is:

2.37 °C/m

Molality of the 177.0g of KBr solution (Molar mass: 119g/mol) is:

177.0g × (1mol / 119g) = 1.487 moles / 0.800kg = 1.859m

And the freezing point depression formula is:

7.2°C = 2.37°C/m×1.859m×i

1.63 = i

Van't Hoff factor of KBr is 1.63

Answer:

i need help with this and the answer above is wrong

Explanation:

pls

Answer:

Half-lives of first order reactions

[A]1/2[A]o=12=e−kt1/2.

ln0.5=−kt.

t1/2=ln2k≈0.693k.

Answer:

Q = 21.896kJ

Explanation:

Q = ?

∇U = 21.39kJ

W = ?

W = P∇V

W = P (V2 - V1)

W = 0.276 × (1.876 - 0.04232)

W = 0.276 × 1.83368

W = 0.5060J

Q = ∇U + W

Q = 21.39 + 0.5060

Q = 21.896kJ

The energy change corresponds to the work done by the system

Answer:

[tex]\Delta E=21.34kJ[/tex]

Explanation:

Hello,

In this case, we should apply the first law of thermodynamics to compute the energy change:

[tex]\Delta E=Q-W[/tex]

Thus, with the given volume change we compute the corresponding work in kJ:

[tex]W=P\Delta V=0.276atm*(1.876L-0.0432L)*\frac{101.325kPa}{1atm}*\frac{1m^3}{1000L}=0.0513kJ[/tex]

Then, we compute the energy change:

[tex]\Delta E=21.39kJ-0.0512kJ\\\\\Delta E=21.34kJ[/tex]

Best regards.

Answer:

that is a solid and that there are other ways to make a fire?

Answer:

Intertidal zone

Neritic zone

Open-ocean zone

Note: the correct questions are found below;

In which zone do you find marshes and mangrove forests?

In which zone are plankton plentiful, providing plenty of food for the fish that live there?

In which zone would you find very little plant or animal life compared to other zones?

Explanation:

The intertidal zone, sometimes called the littoral zone, is the area of the marine shoreline that is exposed to air at low tide, and covered with seawater when the tide is high. Intertidal zonation refers to the tendency of plants and animals to form distinct communities between the high and low tide lines. Some microclimates in the littoral zone are moderated by local features and larger plants such as mangroves.

The neritic zone is the region of shallow water (200 meters depth) above the continental shelf where light penetrates to the sea floor.

Due to the abundant supply of sunlight and nutrients such as plankton in this zone, it is the most productive ocean zone supporting the vast majority of marine life.

The open oceans or pelagic ecosystems are the areas away from the coastal boundaries and above the seabed. It encompasses the entire water column and lies beyond the edge of the continental shelf. It extends from the tropics to the polar regions and from the sea surface to the abyssal depths.

Answer:

Intertidal zone

Neritic zone

Open-ocean zone

Explanation:

Explanation:

when NaSO4 added, Ca2+ + SO42- = CaSO4

and Calcium sulphate is a white insoluble precipitate

when NaCO3 added, Fe2+ + CO32- = FeCO3

and it is a green precipitate

Answer:

3Mg(s) +2P(s) -------> Mg3P2(s) + energy

Keq= [Mg3P2]/[Mg]^3 [P]^2

Explanation:

The equation for the formation of magnesium phosphide from its elements is;

3Mg(s) +2P(s) -------> Mg3P2(s) + energy

Hence we can see that three moles of magnesium atoms combines with two moles of phosphorus atoms to yield one mole of magnesium phosphide. The equation written above is the balanced chemical reaction equation for the formation of the magnesium phosphide.

The equilibrium expression for the reaction K(eq) will be given by;

Keq= [Mg3P2]/[Mg]^3 [P]^2

Answer:

Energy per mole of photons = 2.31 × 10^2 KJ/mol

Explanation:

Energy, E = hf;

Where h is Planck's constant = 6.63 ×10^-34, and f is frequency of the photons.

E = 6.63 × 10^-34 × 5.8 × 10^14

E = 3.84 × 10^-22 KiloJoules

I mole of photons contains Avogadro's number of particles, 6.02 × 10^23

Therefore, the energy per mile of photon is 3.84 × 10^-22 KJ × 6.02 × 10^23

Energy per mile of photon = 2.31 × 10^2 KJ/mol

Answer:

The correct answer is the imperial system.

Explanation:

Only three countries in the world, that is, the United States, Myanmar, and Liberia use the imperial system. These include measurements in the form of inches, ounces, Fahrenheit, and feet. In the imperial system, the distances, height, weight, or area measurements are used eventually that traced back to everyday items or parts of the body.  

In comparison to other metric systems, the units used in the imperial system are not further differentiated easily into parts of hundreds or thousands, and are thus, regarded of less use in comparison to other metric systems by some. The real follower of the imperial system at present in the world is the United States.  

Answer:

The mass of PbI2 will be 18.2 grams

Explanation:

Step 1: Data given

Volume solution = 99.8 mL = 0.0998 L

mass % KI = 12.0 %

Density = 1.093 g/mL

Volume of the other solution = 96.7 mL = 0.967 L

mass % of Pb(NO3)2 = 14.0 %

Density = 1.134 g/mL

Step 2: The balanced equation

Pb(NO3)2(aq) + 2 KI(aq) ⇆ PbI2(s) + 2 KNO3(aq)

Step 3: Calculate mass

Mass = density * volume

Mass KI solution = 1.093 g/mL * 99.8 mL

Mass KI solution = 109.08 grams

Mass KI solution = 109.08 grams *0.12 = 13.09 grams

Mass of Pb(NO3)2 solution = 1.134 g/mL * 96.7 mL

Mass of Pb(NO3)2 solution = 109.66 grams

Mass of Pb(NO3)2 solution = 109.66 grams * 0.14 = 15.35 grams

Step 4: Calculate moles

Moles = mass / molar mass

Moles KI = 13.09 grams / 166.0 g/mol

Moles KI = 0.0789 moles

Moles Pb(NO3)2 = 15.35 grams / 331.2 g/mol

Moles Pb(NO3)2 = 0.0463 moles

Step 5: Calculate the limiting reactant

For 1 mol Pb(NO3)2 we need 2 moles KI to produce 1 mol PbI2 and 2 moles KNO3

Ki is the limiting reactant. It will completely be consumed ( 0.0789 moles). Pb(NO3)2 is in excess. There will react 0.0789/2 = 0.03945 moles. There will remain 0.0463 - 0.03945 = 0.00685 moles

Step 6: Calculate moles PbI2

For 1 mol Pb(NO3)2 we need 2 moles KI to produce 1 mol PbI2 and 2 moles KNO3

For 0.0789 moles KI we'll have 0.0789/2 = 0.03945 moles PbI2

Step 7: Calculate mass of PbI2

Mass PbI2 = moles PbI2 * molar mass PbI2

Mass PbI2 = 0.03945 moles * 461.01 g/mol

Mass PbI2 = 18.2 grams

Answer:

see explaination

Explanation:

Please kindly check attachment for the step by step solution of the given problem

Answer:

[tex]V_2=9.97L[/tex]

Explanation:

Hello,

In this case, we can apply the Boyle's law in order to understand the pressure-volume relationship as an inversely proportional relationship:

[tex]P_1V_1=P_2V_2[/tex]

Thus, we can solve for the resulting volume at the second state as follows:

[tex]V_2=\frac{P_1V_1}{P_2}=\frac{5.0L*760torr}{389tor} \\\\V_2=9.97L[/tex]

Best regards.

Answer:

a) Total vapor pressure = 68.948 Kpa

b) Mole fraction of A = 41%, mole fraction of B = 59%

Explanation:

Find the given attachments.

Answer:

Coal; H2SO4(sulfuric acid)

Explanation:

Coal has been very helpful in power generation for decades. It has also become a major contributor to global warming, and has major negative effects on human health and the environment.

Coal is formed when dead plant matter submerged in swamp environments is subjected to the geological forces of heat and pressure over hundreds of millions of years. Over time, the plant matter transforms from moist, low-carbon peat, to coal, an energy- and carbon-dense black or brownish-black sedimentary rock.

There are many types of coal. Each type of coal must contain sulfur, which, when burned, releases toxic air pollution. The extent Sulfur content in a given coal sample is largely decided by the conditions under which the coal is formed. Low-sulfur coal usually develop in freshwater environments; high-sulfur coals are formed in brackish swamps.

The burning of coal releases its sulphur content as oxides of sulphur (SOx). These oxides of sulphur dissolve in rain water to form acid rain. Hence rain falling around the Colstrip power plant will contain H2SO4 resulting from the dissolution of SOx in rain droplets.

Answer:

210 amps

Explanation:

B

Answer:

Sn2–

Explanation:

The formula of the ion when tin achieves a stable electron configuration is Sn⁴⁺. Therefore, option (C) is correct.

Tin is a element with the atomic number 50 and the chemical symbol Sn. Tin is present in group 14 as a post-transition metal. Tin has two common oxidation states, +2 and +4. The oxidation state +4 of tin metal is somewhat more stable.

Sn⁴⁺ ion is chemically comparable to both of its neighbor germanium and lead in group 14. The electronic configuration of the tin metal is [Kr] 4d¹⁰5s²5p². It has four electrons in its valence shell so when it losses four electrons it gets configuration with fully filled subshells.

Sn²⁺ is called the stannous ion, while its compound SnCl₂ is known as stannous chloride.  Sn⁴⁺ is called the stannic ion, while its compound SnCl⁴ is stannic chloride which is a volatile liquid.

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Answer:

In this reaction, [tex]6\; \rm mol[/tex] of [tex]\rm N_2[/tex]  will react with [tex]18\; \rm mol[/tex] of [tex]\rm H_2[/tex].

Explanation:

In the balanced equation for this reaction, the ratio between the coefficient of [tex]\rm H_2[/tex] and [tex]\rm N_2[/tex] is [tex]3 : 1[/tex]. That is: [tex]n(\mathrm{H_2}) : n(\mathrm{N_2}) = 3:1[/tex]. That's the same as saying that for every one mole of [tex]\rm N_2[/tex] consumed, three moles of [tex]\rm H_2[/tex] will be consumed.

Rewrite this ratio as a fraction:

[tex]\displaystyle \frac{n(\mathrm{H_2})}{n(\mathrm{N_2})} = \frac{3}{1}[/tex].

Take the reciprocal of both sides to obtain:

[tex]\displaystyle \frac{n(\mathrm{N_2})}{n(\mathrm{H_2})} = \frac{1}{3}[/tex].

It is given that [tex]18\; \rm mol[/tex] of [tex]\rm H_2[/tex] was consumed; in other words, [tex]n(\mathrm{H_2}) = 18\; \rm mol[/tex]. The question is asking for [tex]n(\mathrm{N_2})[/tex], the number of moles of [tex]\rm N_2[/tex] required. Apply this ratio:

[tex]\begin{aligned}n(\mathrm{N_2}) &= n(\mathrm{H_2}) \cdot \frac{n(\mathrm{N_2})}{n(\mathrm{H_2})}\\ &= 18\; \rm mol \times \frac{1}{3} = 6\; \rm mol\end{aligned}[/tex].

Hence the conclusion: in this reaction, it will take (at least) [tex]6\; \rm mol[/tex] of [tex]\rm N_2[/tex] to react with [tex]18\; \rm mol[/tex] of [tex]\rm H_2[/tex].

The compound whose dissolution is exothermic in the list is NaOH.

An exothermic reaction is one in which heat is gven out in the process. In an exothermic reaction, the reaction vessel feels hot after the reaction is complete.

The table is not shown here. However, we know that the dissolution of NaOH in water is an exothermic process hence the answer is option C.

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