The part of the flower responsible for producing pollen (sperm) is the _______.



filament


anther


stigma


style

There are three atoms of Sn (Stannous or Tin) in 356.13 g of Sn.

One atom of Sn has the atomic mass (mₐ) of 118,71u which means:

356.13/118.71=3 atoms of Sn

The mass number (symbol A) also called atomic mass number or nucleon number is the total number of protons and neutrons in an atomic nucleus. It determines the atomic mass of atoms and it is in the periodic table.

The root mean square velocity of gaseous argon atoms at 26 °C is 364.42 m/s.

The root mean square velocity of gaseous argon atoms can be calculated using the equation Vrms= √(3kT/m), where k is the Boltzmann constant, T is the temperature, and m is the mass of the particle.

To calculate the velocity, we need to convert the temperature to Kelvin by adding 273.15 to the value in degrees Celsius. In this case, the temperature is 26 °C, so T = 26 + 273.15 = 299.15 K.

Substituting the given values and the molar mass of argon into the equation, we get Vrms= √(3 (1.38x10-23 J/K) (299.15 K) / (39.948 g/mol)) = 364.42 m/s.

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The root mean square speed of gaseous argon atoms at 26 degrees Celsius is calculated using the root mean square equation and the constants for the Boltzmann constant and the molar mass of argon. The temperature is also converted to Kelvin.

In order to calculate the root mean square velocity of gaseous argon atoms at 26 degrees Celsius, we have to use the root mean square speed equation, which is also known as the urms equation. The urms is a measure of the average speed for a group of particles. This equation is calculated as the square root of the average squared speed.

Firstly, we need to convert the temperature to Kelvin by adding 273.15 to the Celsius temperature. Hence, the temperature (T) becomes 299.15K.

The formula for root mean square velocity is Vrms = sqrt(3kT/m) where k is the Boltzmann constant (1.38×10−23 J/K) and m is the molar mass of argon which is 39.95g/mol. Please note, that the molar mass should be converted to kg/mol which becomes 39.95x10^-3 kg/mol.

So, urms=sqrt[(3)(1.38×10−23 J/K)(299.15K)/(39.95x10^-3 kg/mol)]. This will give you the root mean square speed of gaseous argon atoms at 26 degrees Celsius.

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The reaction rate is the rate at which reactants convert to the product. The rate of appearance of hydrogen is [tex]\bold{ 0.070 ms^-^1}[/tex]

The given reaction,

[tex]\bold { 2HBr(g) \rightarrow H_2 (g)+Br_2(g)}[/tex]

2 moles of HBr degrade to form 1 mole of Hydrogen and 1 mole of bromine.

The rate of disappearance of HBr = 0.140 m [tex]\bold {s^-^1}[/tex]

Since the molar ratio between HBr and Hydrogen is  2:1.

So,

[tex]\bold{Ra(H_2) = \dfrac {Rd(HBr)} {2}}[/tex]

Where,

[tex]\bold{Ra(H_2)}[/tex] - Rate of appearance of Hydrogen

[tex]\bold{ Rd(HBr)}[/tex]- Rate of disappearance of HBr

Put the value,

[tex]\bold{Ra(H_2) = \dfrac {Rd(HBr)} {2}}\\\\\bold {Ra(H_2) = \dfrac {0.140 m/s} {2}}\\\\\bold { Ra(H_2) = 0.070 ms^-^1}[/tex]

Therefore, the rate of appearance of hydrogen is [tex]\bold{ 0.070 ms^-^1}[/tex].

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Steam distillation is a separation process for temperature sensitive materials and it is used for purification of organic compounds.

The water vapor carries small amounts of the vaporized compounds (water and organic molecules) to the condensation flask. This is preferred technique because allows easy separation of the components by decantation or other suitable methods, because  product od distilation is a two phase system of water and the organic distillate.

Steam distillation is a technique used to purify high boiling liquids that are water-insoluble. It involves introducing steam to vaporize the compound at a temperature lower than its normal boiling point, making the process efficient and preventing decomposition.

What is Steam Distillation?

Steam distillation is a variation of simple distillation technique that involves the use of steam or water in addition to the material to be distilled. The main purpose of utilizing steam is to facilitate the distillation of compounds that are water-insoluble and have high boiling points. When steam is introduced into the distilling flask, it helps in vaporizing the organic compound at a temperature lower than its normal boiling point. This process is ideal for purifying such substances because it reduces the risk of decomposition, which is often linked with the high temperatures required for distilling high boiling point liquids.

The distillation apparatus setup for this method is similar to that of simple distillation, with slight modifications to introduce steam into the system. There are two primary ways to add the steam: indirectly by connecting to a building's steam line, or directly by boiling water within the distillation flask itself.

Steam distillation is especially beneficial in separating and purifying volatile compounds from non-volatile impurities or substances with very high boiling points without decomposition. This method is not only used in laboratory settings but also has wide applications in industrial processes, such as the extraction of essential oils and the refinement of certain petrochemicals.

To determine the percentage of Ca2+ that remains unprecipitated, calculate the moles of Ca2+ and SO4^2- and use the limiting reagent to find the remaining Ca2+. Finally, use this value to calculate the percentage.

To determine the percentage of Ca2+ that remains unprecipitated, we first need to calculate the moles of Ca2+ and SO42- in the solution.

The moles of Ca2+ can be calculated using the formula Molarity (M) = Moles (mol) / Volume (L). Once the moles of Ca2+ and SO42- are known, we can determine which ion is the limiting reagent and calculate how much of the other ion remains unprecipitated.

The formula for the percentage of the Ca2+ that remains unprecipitated is: (Moles of Ca2+ that remains unprecipitated / Initial moles of Ca2+) x 100%.

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In an ecosystem, collection area is a part of a watershed which  is at the lowest elevation.

An ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the ecosystem through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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The net ionic equation for the reaction occurs when aqueous solutions of hypochlorous acid and sodium hydroxide are combined is:

[tex]\mathbf{HClO_{(aq)} + OH^-_{(aq)} \to ClO^-_{(aq)} + H_2O_{(l)}}[/tex]

An Oxidation-reduction reaction is a reaction in which the oxidation states of an atom is being transformed from one state to the other.

In an oxidation-reduction or redox reaction, reacting electrons are shifted and transferred from one reacting species to another.

The net ionic equation for the reaction occurs when aqueous solutions of hypochlorous acid and sodium hydroxide are combined is determined as follow:

The complete Ionic equation is:

[tex]\mathbf{HClO_{(aq)} + NaOH_{(aq)} \to NaClO_{(aq)} + H_2O_{(l)}}[/tex]

∴

[tex]\mathbf{HClO_{(aq)} + Na^+_{(aq)} + OH^-_{(aq)} \to Na^+{(aq)} + ClO^-_{(aq)} + H_2O_{(l)}}[/tex]

The net Ionic Equation is:

[tex]\mathbf{HClO_{(aq)} + OH^-_{(aq)} \to ClO^-_{(aq)} + H_2O_{(l)}}[/tex]

We can therefore conclude that the net Ionic Equation is [tex]\mathbf{HClO_{(aq)} + OH^-_{(aq)} \to ClO^-_{(aq)} + H_2O_{(l)}}[/tex]

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Final answer:

The net ionic equation for the reaction between hypochlorous acid (HOCl) and sodium hydroxide (NaOH) is HOCl (aq) + OH- (aq) -> OCl- (aq) + H2O (l). This neutralization reaction forms sodium hypochlorite and water, with sodium ions being spectator ions.

Explanation:

The net ionic equation for the reaction that occurs when aqueous solutions of hypochlorous acid (HOCl) and sodium hydroxide (NaOH) are combined can be written following the principles of a double displacement reaction, which is a type of neutralization reaction. Despite the information provided referring to the reaction of hydrochloric acid (HCl) with NaOH, the question asks about hypochlorous acid specifically. Thus, the reaction between HOCl and NaOH will result in the formation of sodium hypochlorite (NaOCl) and water (H2O), not HCl and NaOH.

Here is the net ionic equation for the HOCl and NaOH reaction:
HOCl (aq) + OH- (aq) → OCl- (aq) + H2O (l)

In this reaction, the OCl- is the conjugate base of hypochlorous acid, and the hydroxide ion (OH-) comes from the sodium hydroxide. The H+ from the acid and the OH- from the base combine to form water, leaving the OCl- and Na+ ions in solution. As Na+ is a spectator ion, it does not appear in the net ionic equation.

Answer : 'Sb' is the element which has the greatest atomic radius.

Explanation :

The general trend of the atomic radium of the element is that,

As we are going from left to right in a periodic table the atomic radius of the elements decreases and as we are going from top to bottom in a periodic table the atomic radius of the elements increases.

The given elements are the group 15 elements in which the 'Sb' is the element which has the greatest atomic radius as compared to N, P and As because as we are going from top to bottom in group 15 the the atomic radius of the elements increases that means the number of energy shells increases.

Hence, 'Sb' is the element which has the greatest atomic radius.

A neutrally charged atom has the same number of electrons and protons. Therefore, a sodium atom has 11 electrons and 11 protons, while a chlorine atom has 17 electrons and 17 protons.

A given atom's electron count can be identified by looking at its atomic number because a neutrally charged atom has an equal amount of protons and electrons. Sodium has an atomic number of 11, which means it has 11 electrons if it is neutrally charged. Similarly, chlorine, with an atomic number of 17, has 17 electrons.

As stated, a neutrally charged atom has an equal number of protons and electrons. Thus, the proton count is also dictated by the atomic number. Sodium, therefore, has 11 protons, and chlorine will have 17 protons.

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Standardizing a NaOH solution means determining its accurate concentration or molarity. It's necessary because factors like air exposure and the hygroscopic nature of NaOH can distort the accurate measurement of NaOH's weight, leading to inaccurate calculation of molarity. By titration using a known concentration solution, NaOH's accurate molarity can be determined.

Standardizing a solution, in this case a NaOH solution, means to accurate determine the concentration (Molarity) of the solution. It is important because the concentration of NaOH cannot be determined accurately just by dissolving it in water. This is due to factors like air exposure and the hygroscopic nature of NaOH,

Hygroscopic substances absorb moisture from the air, and so the actual weight and hence, the accordant molar concentration of the NaOH in the solution can be distorted. But, by a process known as titration, using a solution of accurately known concentration to react with the NaOH solution, the molarity can be determined accurately.

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Final answer:

Standardizing a NaOH solution is necessary to accurately determine its concentration due to the presence of impurities and water absorption. The process involves titrating the NaOH against a primary standard like KHP. Without standardization, the molarity of NaOH solution cannot be precisely known.

Explanation:

Standardizing a NaOH Solution:

To standardize the NaOH solution means to accurately determine its concentration because NaOH solid often contains impurities and absorbs water from the atmosphere, which affects its molarity. The process typically involves titrating NaOH against a primary standard such as potassium hydrogen phthalate (KHP). A carefully weighed amount of dry KHP is dissolved in water and titrated with the NaOH solution. The point at which the reaction between KHP and the NaOH is complete (the endpoint) allows for the calculation of the NaOH's molarity.

One reason the molarity of an NaOH solution cannot be determined accurately without standardization is because commercially available NaOH contains impurities such as sodium chloride (NaCl), sodium carbonate (Na₂CO₃), and sodium sulfate (Na₂SO₄), and it readily absorbs water (H₂O). As a secondary standard, its exact concentration is not known unless standardized against a primary standard.

If we want to prepare 2 liters of a 0.100 M NaOH solution, we would use the equation: Mass NaOH = Molarity (M) x Molar Mass NaOH x Volume NaOH (L). For NaOH with a molar mass of 40.0 g/mol, the calculation is 0.100 mol/L x 40.0 g/mol x 2.00 L, resulting in 8.00 g of NaOH required.

Answer : - 136.0 KJ/mol

Explanation : The complete question is attached below; assuming that the bond energies are given as per the question to find out the heat of formation of [tex] H_{2}O_{2}_{(g)} [/tex] we need to draw its lewis dot structure for this reaction;

[tex] H_{2}_{(g)} + O_{2}_{(g)} ----> H_{2}O_{2}_{(g)} [/tex]

[tex] H_{2} [/tex] will have H-H bond and [tex] O_{2} [/tex] will have O=O with 2 pairs of lone electrons on each of O atom.....These are the bonds which are broken

In [tex] H_{2}O_{2}_{(g)} [/tex] has H-O-O-H bonds; Here, O atom again has 2 pairs of lone pairs on each O atom; ....These are bonds which are made

ΔH°f = ∑ {ΔH(bonds broken) - ΔH (bonds made)}

ΔH°f = ∑ { (432 + 494) - [(459 X 2) +142] }

On solving, We get,

ΔH°f = -136.0 KJ/mol

Hence, the heat of formation for [tex] H_{2}O_{2}_{(g)} [/tex] will be -136.0 KJ/mol

An atom would have the greatest velocity if each atom had the same kinetic energy is hydrogen. Therefore, option A is correct.

The energy an item has as a result of motion is known as kinetic energy. A force must be applied to an item in order to accelerate it. We must put forth effort in order to apply a force. Once the job is finished, energy is transferred to the item, which then moves at a new, constant speed.

The reason molecules in gases have the largest kinetic energy is because they have greater space between one another, experience less intermolecular force, and travel at a faster rate, which results in higher energy.

The most kinetic energy is found in gases, whereas solids have the lowest. So, of the examples above, hydrogen has the largest kinetic energy.

Thus, option A is correct.

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Your question is incomplete, most probably your question was

Which of the following atoms would have the greatest velocity if each atom had the same kinetic energy?

A. Hydrogen

B. Oxygen

C. Carbon

D. Sulfur

Answer:

176 L liters of water vapor can be produced.

Explanation:

Using the Ideal gas law,

PV = nRT, where P, T, n, R and T stand for pressure, volume, moles, universal gas constant and temperature respectively.

n = m/M, where n, m and M stand for moles, mass and molar mass respectively.

PV = [tex]\frac{mRT}{M}[/tex]

Given ,

T = 312 K

P = 0.98 atm

m = 108 g

M (CH4) = 16.04 g /mol

R = 0.0821 Latm/molK

V = [tex]\frac{mRT}{PM}[/tex]

Plugging the numbers in the  Ideal gas law we get,

V = [tex]\frac{(108 g)(0.0821 Latm/molK)(312K)}{(16.04g/mol)(0.98atm)}[/tex]

V = 175.99 L

Final answer:

To determine the freezing point of a 1.50 m NaCl solution, we need to calculate the freezing point depression using the formula: ΔT = Kf × m × i, where ΔT is the freezing point depression, Kf is the freezing point depression constant for water, m is the molality of the solution, and i is the van 't Hoff factor. In this case, the van 't Hoff factor for NaCl is given as 1.9. The freezing point of the solution can be found by subtracting the calculated freezing point depression from the freezing point of pure water.

Explanation:

To determine the freezing point of a 1.50 m NaCl solution, we need to calculate the freezing point depression using the formula:

ΔT = Kf × m × i,

where ΔT is the freezing point depression, Kf is the freezing point depression constant for water, m is the molality of the solution, and i is the van 't Hoff factor. In this case, the van 't Hoff factor for NaCl is given as 1.9.

Let's substitute the given values into the formula:

ΔT = 1.86 °C/m × 1.50 m × 1.9,

ΔT = 5.31 °C.

To find the freezing point of the solution, we subtract the calculated freezing point depression from the freezing point of pure water, which is 0 °C:

Freezing point = 0 °C - 5.31 °C = -5.31 °C.

Therefore, the 1.50 m NaCl solution would freeze at a temperature of -5.31 °C.

They may drown when the glaciers melt is the cause of extinction of polar bears.

The climate change is the main factor for extinction of polar bear. This climate change is responsible for melting and fragmention of sea ice across the Arctic, forcing more pregnant females to migrate to land. This fragmentation also causes the drowning of polar bears.

So we can conclude that They may drown when the glaciers melt is the cause of extinction of polar bears.

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Answer:

Explanation:

A) Their thick fur is not suited for a warming climate.

Answer: Coli contamination/ E.coli contamination

Explanation:

When there are harmful substance in, whether microorganisms or chemicals in food which can cause adverse effects on animals, the term for it is called food contamination. Food contamination can be caused contamination by pathogenic bacteria, viruses, and protozoa.

One of the microorganisms that can be found in food and poses threat to animals life is the Escherichia coli. Escherichia is a bacteria. Naturallyy, the Escherichia coli can be found in animals(including humans) intestines. So, some kinds might be harmless.

While some are poisonous and cause food poisoning. Some of the symptoms include: pneumonia, diarrhea, respiratory illness and so on.

The elements which has the greatest tendency to attract electrons are more electronegative. Elements like halogens, oxygen, nitrogen etc. are the most electronegative elements which easily attracts electrons.

The ability of an atomic nucleus to attracts its electrons and the bonded pair of electrons is called electronegativity. From left to right in periodic table electronegativity increases from metals to non-metals.

As the electronegativity increases, ionization energy of elements increases. Elements which are deficient of electrons needs to gain electrons to attain stability. According to octet law, as the valence shell fills 8 electrons the atom becomes stable.

Thus, the elements  bonds with other elements to attain electrons for filling their octet. The more electronegative atoms attracts the bonded pair of electrons towards it and acquire a partial negative charge.

Halogens are more electronegative since they have seven valence electrons and thus need only one electron to attain octet. Thereby, there will be more tends to attract one electron. Similarly, oxygen, sulphur, nitrogen etc. are electronegative elements.

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Answer:

C. The carbon atoms in graphite are arranged in widely spaced layers.

Explanation:

Allotropes are different structural forms of the same element that exist is the same physical state. In other words, they differ in their bonding arrangement.

Carbon has two allotropes: diamond and graphite.

In diamond each C atom is sp3 hybridised and is bonded to 4 other C atoms forming a tetrahedral unit which extends into a crystalline network. In contrast, each C atom in graphite is sp2 hybridised and bonded to 3 other carbon atoms in a crystalline hexagonal layer like structure.

Thus, the carbon atoms in graphite are arranged in widely spaced layers.

Final answer:

To calculate the mass of nitrogen dissolved in an 80.0 L aquarium, apply Henry's Law using the mole fraction and total pressure alongside the molar mass of N2, resulting in approximately 1.066 grams of dissolved nitrogen.

Explanation:

To calculate the mass of nitrogen dissolved in an 80.0 L home aquarium at room temperature, we consider the given total pressure of 1.0 atm and the mole fraction for nitrogen of 0.78. With the Henry's law constant (Kh) for nitrogen in water being 6.1 x 10-4 M/atm, we can determine the concentration of dissolved nitrogen first.

First, calculate the partial pressure of nitrogen (PN2) using the mole fraction and total pressure:

PN2 = mole fraction of N2 * total pressure = 0.78 * 1.0 atm = 0.78 atm

Next, apply Henry's Law to find the concentration of N2 in moles per liter (M):

Concentration of N2 = Kh * PN2 = 6.1 x 10-4 M/atm * 0.78 atm = 4.758 x 10-4 M

To find the total moles of N2 dissolved, multiply this concentration by the volume of the aquarium in liters:

Total moles of N2 = 4.758 x 10-4 M * 80.0 L = 0.038064 mol

Finally, to calculate the mass, we multiply the total moles by the molar mass of N2 (28.01 g/mol):

Mass of N2 = 0.038064 mol * 28.01 g/mol = 1.066 g

Answer:

The most acidic or strongest acid is with pH equal to 0.5

Explanation:

The pH of the solution is defined as negative logarithm of [tex]H^+[/tex] concentration.

Mathematically can written as:

[tex]pH=-\log[H^+][/tex]

[tex]pH\propto \frac{1}{[H^+]}[/tex]

From the above expression we can see that pH of the solution is inversely related to the concentration of the [tex]H^+[/tex] ions.

This means that higher the concentration of [tex]H^+[/tex] ions in the solution higher will be pH and more acidic will be the solution.

So, from the given option the most acidic or strongest acid is with pH equal to 0.5 because the concentration [tex]H^+[/tex] ions is highest in this solution with respect to other solutions.

Answer:

The answer is 83

Explanation:

I took a quiz and 63 was wrong and it was 83

Answer : The name of the given hydrocarbon is, 2-methylpropane.

Explanation :

The basic rules for naming of organic compounds are :

In the given hydrocarbon, the longest possible carbon chain number is 3 that means we add prefix 'prop' and suffix '-ane' and a substituent present at 2nd position of the longest carbon chain. So, the name of given hydrocarbon will be, 2-methylpropane.

Hence, the name of the given hydrocarbon is, 2-methylpropane.

The time taken for a first-order reaction's reactant to decrease from 0.13M to 0.088M can be calculated using the formula ln([A]start / [A]finish) = kt. By substituting the provided values into the formula and solving for t, we can get the precise duration.

A first-order reaction relies on the concentration of only one reactant. The rate at which this reaction proceeds is directly proportional to this reactant's concentration. The reaction mentioned in this question has its rate constant (k) as 0.33 min-1.

One key formula used to quantify the reaction rate is ln([A]start / [A]finish) = kt. In this formula, [A]start and [A]finish represent the concentration of the reactant at the beginning and end of the period, and t represents the time taken for the reaction.

Substituting the given values into the formula gives us ln(0.13 / 0.088) = 0.33t. Solving this equation for t the time taken  to decrease from 0.13M to 0.088M.

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Answer:

Yes.

Explanation:

Hello,

As long as it shows important relationships between the size and color of stars, age wouldn't affect observation and measurement but will just provide more accurate results but the method is still valid.

Best regards.

Answer:

Yes.

Explanation: