What do atoms make up

Answer: Light, Chemical

Explanation: This is the answer because "photosynthesis takes place in two stages: the light-dependent reactions and the Calvin cycle. In the light-dependent reactions, which take place at the thylakoid membrane, chlorophyll absorbs energy from sunlight and then converts it into chemical energy with the use of water." - source https://opentextbc.ca/

In the photosynthesis the energy starts as Light energy and ends up as Chemical Energy. Hence option (D) is correct

The process by that inexperienced plants and a few different organisms use daylight to synthesize nutrients from carbonic acid gas and water. chemical action in plants usually involves the inexperienced pigment and generates element as a by-product.

Photosynthesis may be a method employed by plants and different organisms to convert lightweight energy into energy that, through internal respiration, will later be discharged to fuel the organism's activities.

photosynthesis takes place in 2 stages: the light-dependent reactions and also the Calvin cycle. within the light-dependent reactions, that manifest itself at the thylakoid membrane, pigment absorbs energy from daylight and so converts it into energy with the employment of water.

Therefore, In the photosynthesis the energy starts as Light energy and ends up as Chemical Energy. Hence option (D) is correct

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Answer: A

Explanation:

Answer:

Thicker rings indicate a longer or faster growing season. This means that the temperature was high for a longer time and allowed the tree to grow more. Smaller rings show shorter or slower growing seasons which means either the temperature was low or the tree didn't have enough water to grow very much.

Explanation:

Hoped that helped!

Answer:120

Explanation: I think

Answer:

1321.177 grams.

Explanation:

each mole of carbon is 12.0107 grams.

Answer:

Rate = k[NH₄OH]²

k = 6.17

Explanation:

We have concentrations of NH₄OH along with the given times. To determine the rate law of the reaction we need to determine first the order of reaction. This reaction can be order zero, first or second order. The expressions for each are the following:

Zero order:

k = [A₀] - [A] / t

First order:

k = 1/t * ln([A₀]/[A])

Second order:

k = (1/t) * (1/[A₀] - 1/[A])

And from here, the next part is easier. We just need to determine hat order is, calculating the value of k at two different times. If the value of k is constant, then we can say that the reaction is of that order.

Let's suppose its order zero (t = 1 and t = 2, [A₀] = 0.200 M):

k1 = 0.2 - 0.0895 / 1 = 0.1105

k2 = 0.2 - 0.577 / 2 = -0.1885

From this results we can conclude it's not zero order.

Let's suppose its order 1:

k1 = ln(0.2/0.0895) / 1 = 0.8041

k2 = ln(0.2/0.577) / 2 = 0.1733

It's not first order either, so we can conclude that this reaction is of 2nd order and the rate law would be:

Now that we know it's a second order reaction, we can determine the value of k using its expression:

k = (1/t) (1/[A] - 1/[A₀])

k = ln(1/0.0895 - 1/0.2) (1/1)

k = 6.17

And to confirm this value, let's calculate k for t = 2 s

k = (1/2) (1/0.0577 - 1/0.2)

The value is constant, so this is the true value of k.

Hope this helps

Answer:

c. water is added to coffe until the solution becomes clear

Answer:

c

Explanation:

Water is added to coffee until the solution becomes

clear.

Answer:

Option C

Explanation:

Pure  germanium is  a bad conductors of electricity. It is so because its valence band is full and its outer electrons are attached through covalent bond  is a diamond like framework. In metallic sense, it is neither a conductor nor an insulator but a semiconductor. It has a small band gap of 0.7eV.

Hence, option C is correct

Answer:

I think its J

Explanation:

sorry if im wrong

Answer:

answers is -d

Explanation:

,kggc’hnftfj’trudging.ugu,y

Answer:

24.8g of fuel

Explanation:

while

[tex]C_{water}=4180j/kg*k[/tex]

[tex]m=\frac{2.7*4180*(100-21)}{36*1000}=24.8g[/tex]

Answer:

Plants use carbon dioxide for photosynthesis

Explanation:

They take it in, and chemically combined it with water to form glucose and oxygen

Answer:

the distillate (D) and the bottoms (B) products flow rates are;

B = 72.1875 kmol/hr

D = 37.8125 kmol/hr

Explanation:

Given the data in the question;

as illustrated in the image below;

F1 stream, ( 90 kmol/hr ) contains 42 mol% p-xylene and Feed 2 ( 20 kmol/hr) contains 9mol% p-xylene, so;

more volatile → p-xylene

less volatile → o-xylene

now, Overall balance;

F1 + F2 = D + B

90 + 20 = D + B

D + B = 110    ------------- let this be equation 1

p-xylene. component balance;

0.42F1 + 0.09F2 = 0.99D +  0.03B

0.42(90) + 0.09(20) = 0.99D +  0.03B

37.8 + 1.8 = 0.99D +  0.03B

0.99D +  0.03B = 39.6 --------------- let this be equation 2

from equation 1 and 2

input (D = 110 - B) into equation 2

0.99(110 - B) +  0.03B = 39.6

108.9 - 0.99B + 0.03B = 39.6

108.9 - 39.6 = 0.99B - 0.03B

69.3 = 0.96B

B = 69.3 / 0.96

B = 72.1875

now, input B = 72.1875 into equation 1

D + B = 110

D + 72.1875 = 110

D = 110 - 72.1875

D = 37.8125

Therefore, the distillate (D) and the bottoms (B) products flow rates are;

B = 72.1875 kmol/hr

D = 37.8125 kmol/hr

Answer: The formula for the precipitate formed is [tex]ZnCO_3[/tex]

Explanation:

A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.  

A double displacement reaction in which one of the product is formed as a solid is called as precipitation reaction.

The balanced chemical equation when aqueous solutions of zinc chloride and sodium carbonate are mixed:

[tex]ZnCl_2(aq)+Na_2CO_3(aq)\rightarrow ZnCO_3(s)+2NaCl(aq)[/tex]

Alchemy is "an early form of chemistry that people used to try to turn metal into gold".

The development of a universal cure for illness, as well as the discovery of a way to indefinitely extend life, were the goals of mediaeval chemical research and speculative philosophy.

Boyle contributed to the evolution of chemistry from alchemy. He used the experimental approach from physics and applied it to chemistry. Boyle contributed to the comparison of these two fields of knowledge by demonstrating that chemistry is just as important to study as physics.

Therefore, the correct statement will be "An early form of chemistry that people used to try to turn metal into gold".

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Answer:

250 grams = 0.25 liter

Explanation:

Answer:

The mass of oxygen the container must have is 150.85 g.

Explanation:

Given;

mass of the oxygen, m₁ = 44.5 g

initial pressure of the gas, P₁ = 2.3 atm

final pressure of the gas, P₂ = 7.8 atm

Atomic mass of oxygen gas, = O₂ = 16 x 2 = 32 g

initial number of moles of oxygen in the container, n₁ = 44.5/32 = 1.39

let the final number of moles of oxygen = n₂

Apply ideal gas equation;

PV = nRT

[tex]\frac{PV}{Rn} = T\\\\since \ temperature\ T \ is \ constant;\\\\\frac{P_1V}{Rn_1} = \frac{P_2V}{Rn_2}\\\\\frac{P_1}{n_1} = \frac{P_2}{n_2} \\\\n_2 = \frac{n_1P_2}{P_1} \\\\n_2 = \frac{1.39 \times 7.8}{2.3} \\\\n_2 = 4.714 \ moles[/tex]

The mass of the oxygen in grams is calculated as;

m₂ = 4.714 x 32g

m₂ = 150.85 g

Therefore, the mass of oxygen the container must have is 150.85 g.

Answer:

Approximately [tex]4.92[/tex].

Explanation:

Initial volume of the solution: [tex]V = 190.0\; \rm mL = 0.1900\; \rm L[/tex].

Initial quantity of [tex]\rm NH_3[/tex]:

[tex]\begin{aligned} n({\rm NH_3}) &= c({\rm NH_3}) \cdot V({\rm NH_3}) \\ &= 0.3733\; \rm mol \cdot L^{-1} \times 0.1900\; \rm L \\ &\approx 0.154375\; \rm mol\end{aligned}[/tex].

Ammonia [tex]\rm NH_3[/tex] reacts with hydrochloric [tex]\rm HCl[/tex] acid at a one-to-one ratio:

[tex]\rm NH_3 + HCl \to NH_4 Cl[/tex].

Hence, approximately [tex]n({\rm HCl}) = 0.154375\; \rm mol[/tex] of [tex]\rm HCl\![/tex] molecules would be required to exactly react with the [tex]\rm NH_3\![/tex] in the original solution and hence reach the equivalence point of this titration.

Calculate the volume of that [tex]0.3733\; \rm mol \cdot L^{-1}[/tex] [tex]\rm HCl[/tex] solution required for reaching the equivalence point of this titration:

[tex]\begin{aligned}V({\rm HCl}) &= \frac{n({\rm HCl})}{c({\rm HCl})} \\ &\approx \frac{0.154375\; \rm mol}{0.3733\; \rm mol \cdot L^{-1}} \approx 0.413541\; \rm L\end{aligned}[/tex].

Hence, by the assumption stated in the question, the volume of the solution at the equivalence point would be approximately [tex]0.413541\; \rm L + 0.1900\; \rm L \approx 0.6035\; \rm L[/tex].

If no hydrolysis took place, [tex]0.154375\; \rm mol[/tex] of [tex]\rm NH_4 Cl[/tex] would be produced. Because [tex]\rm NH_4 Cl\![/tex] is a soluble salt, the solution would contain [tex]0.154375\; \rm mol\![/tex] of [tex]\rm {NH_4}^{+}[/tex] ions. The concentration of [tex]\rm {NH_4}^{+}\![/tex] would be approximately:

[tex]\begin{aligned}c({\rm {NH_4}^{+}}) &= \frac{n({\rm {NH_4}^{+}})}{V({\rm {NH_4}^{+}})}\\ &\approx \frac{0.154375\; \rm mol}{0.6035\; \rm L} \approx 0.255782\; \rm mol \cdot L^{-1}\end{aligned}[/tex].

However, because [tex]\rm NH_3 \cdot H_2O[/tex] is a weak base, its conjugate [tex]\rm {NH_4}^{+}[/tex] would be a weak base.

[tex]\begin{aligned}pK_{\rm a}({{\rm NH_4}}^{+}) &= pK_{\rm w} - pK_{\rm b}({\rm NH_3})\\ &\approx 13.99 - 4.75 = 9.25\end{aligned}[/tex].

Hence, the following reversible reaction would be take place in the solution at the equivalence point:

[tex]\rm {NH_4}^{+} \rightleftharpoons NH_3 + H^{+}[/tex].

Let [tex]x\; \rm mol \cdot L^{-1}[/tex] be the increase in the concentration of [tex]\rm H^{+}[/tex] in this solution because of this reversible reaction. (Notice that [tex]x \ge 0[/tex].) Construct the following [tex]\text{RICE}[/tex] table:

[tex]\begin{array}{c|ccccc} \textbf{R}& \rm {\rm NH_4}^{+} & \rightleftharpoons & {\rm NH_3}& + & {\rm H}^{+}\\ \textbf{I} & 0.255782 \; \rm M \\ \textbf{C} & -x \;\rm M & & + x\;\rm M & & + x\; \rm M \\ \textbf{E} & (0.255782 - x)\; \rm M & & x\; \rm M & & x\; \rm M\end{array}[/tex].

Thus, at equilibrium:

[tex]\displaystyle \frac{[{\rm NH_3}] \cdot [{\rm H^{+}}]}{[{ \rm {NH_4}^{+}}]} = 10^{pK_\text{a}({\rm {NH_4}^{+}})}[/tex].

[tex]\displaystyle \frac{x^2}{0.255782 - x} \approx 10^{-9.25}[/tex]

Solve for [tex]x[/tex]. (Notice that the value of [tex]x\![/tex] is likely to be much smaller than [tex]0.255782[/tex]. Hence, the denominator on the left-hand side [tex](0.255782 - x) \approx 0.255782[/tex].)

[tex]x \approx 1.19929 \times 10^{-5}[/tex].

Hence, the concentration of [tex]\rm H^{+}[/tex] at the equivalence point of this titration would be approximately [tex]1.19929 \times 10^{-5}\; \rm M[/tex].

Hence, the [tex]pH[/tex] at the equivalence point of this titration would be:

[tex]\begin{aligned}pH &= -\log_{10}[{\rm {H}^{+}}] \\ &\approx -\log_{10} \left(1.19929 \times 10^{-5}\right) \approx 4.92\end{aligned}[/tex].

Answer:

mH₂O = 6.4116 g

Explanation:

Let's write the given reaction:

2H₂ + O₂ -------> 2H₂O

The problem states that 5.7 g of oxygen reacts with excess hydrogen, hence, the limiting reagent is the oxygen. With this mass of oxygen, we can determine the moles, and then, the moles of water with the mole ratio:

moles = mass / atomic weight        AW of O₂ = 16 g/mol

Replacing we have:

moles O₂ = 5.70 / (16 * 2)

moles O₂ = 0.1781 moles

According to the balanced reaction, 1 mole of Oxygen produces 2 moles of water, so we have a mole ratio 1:2, therefore the moles of water would be twice the moles of oxygen:

moles H₂O = 0.1781 * 2 = 0.3562 moles

Finally the mass of water can be calculated solving for the mass from the expression of moles, and using molecular mass of water:

m = moles * MM          MM H₂O = 18 g/mol

m = 0.3562 * 18

Hope this helps

Answer:

65.0cp

Explanation:

Answer: D pancreas

Explanation: testes are for male ovary are for female one human can have both

Answer:

Lead iodide (II) is an inorganic compound, lead salt and hydrogen acid, with the PbI2 formula.

Answer and Explanation:

In order for the spotting phase to be efficient and for the sample to register the repeated applications of the sample, it is necessary that in addition to the solubility and low toxicity, the solvent has a low boiling point, but that allows an efficient and rapid evaporation, whenever necessary, so that it is possible to release the sample on the TLC plate.

The solvent must be able to dissolve the compounds completely with minimal heating.

Even though the question is incomplete but I will try to help you as much as possible. Solvents are considered based .on their specific applications. Generally, a solvent should be non toxic and cheap.

Also, the solvent must be able to dissolve the compounds completely with minimal heating. This is important in deciding weather the solvent is suitable or not.

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Answer:

I think it's B, good luck

Answer:

the total setup time of this process is 100 minutes

Explanation:

Given the data in the question;

Vat holds up to 1000 gallons;

Rate of chemical agents being added to the vat = 4.5 gpm

Reaction time = 85 minute

cleaning ( waiting time ) 15 minute

the setup time of this process = ?

To calculate the setup time for this process, we simply say;

the setup time = Reaction time + cleaning ( waiting time )

so we substitute in our values

the setup time = 85 mins + 15 mins

the setup time = 100 minutes

Therefore, the total setup time of this process is 100 minutes

Answer:

B.a fire hydrant

hope it helps!

Answer:

a veterinarian

Explanation:

i think

Answer:

ıt is the projesi where the polen of one flower reaches the sığmaz of another flower.

Answer:

B

Explanation:

Have a nice day☺gsjsjamsvwksk

Answer:

p= 1

e= 1

n= 0

predicted charge= +1

name of ion= Hydride

Answer:

PpN₂ = 0.326 atm

Explanation:

In this case, let's write the equilibrium reaction taking place here:

2NH₃(g) <------> 3H₂(g) + N₂(g)

Now, we know that when the reaction reach the equilibrium the partial pressure of H₂ is 0.978 atm, so, let's write an ICE chart and see what's happening here:

                 2NH₃(g) <------> 3H₂(g) + N₂(g)

i)                     y                      0           0

c)                 -2x                   +3x          x

e)                y-2x                    3x          x

At the beggining we just have the sample of NH₃, we don't know how much but we don't need that data to get the partial pressure. In equilibrium, its produced hydrogen and nitrogen, and we know how much of hydrogen was produced, so, with that we can solve for the value of the partial pressure of NO by a simple math operation:

PpH₂ = 0.978 atm = 3x

PpN₂ = x

PpN₂ = PpH₂ / 3

PpN₂ = 0.978 / 3

Hope this helps

Answer:

Explanation:

The main aim of this experiment is to correctly identify the sequential steps needed for making recombinant DNA molecules.

The first step is given as:

DNA is treated with restriction enzyme

The remaining steps in order are:

[tex]\text{-all the fragments have identical sticky ends: 5'-TGCA-3'}[/tex]

[tex]\text{-DNA ligase joins the sticky ends of the DNA sample and the plasmid}[/tex]

[tex]\text{-cells containing the recombinant plasmid are grown in a medium with}[/tex]

[tex]\text{ampicillin and x-gal(a galactose derivative)}[/tex]

[tex]\text{-white colonies that survive on the culture medium are identified as}[/tex]

[tex]\text{having the recombinant plasmid}[/tex]

[tex]\text{-colonies containing the recombinant plasmid can be removed from the}[/tex]

[tex]\text{culture medium and grown}[/tex]