Answer:
Graphitic carbon nitride (g-C3N4) is a rising two-dimensional material possessing intrinsic semiconducting property with unique geometric configuration featuring superimposed heterocyclic sp2 carbon and nitrogen network, nonplanar layer chain structure, and alternating buckling. The inherent porous structure of heptazine-based g-C3N4 features electron-rich sp2 nitrogen, which can be exploited as a stable transition metal coordination site. Multiple metal-functionalized g-C3N4 systems have been reported for versatile applications, but local coordination as well as its electronic structure variation upon incoming metal species is not well understood. Here we present detailed bond coordination of divalent iron (Fe2+) through micropore sites of graphitic carbon nitride and provide both experimental and computational evidence supporting the aforementioned proposition.
a teacher divides her class into groups and assigns each group a task of measuring the mass of the same object three times.the teacher already knows that the mass of the object is 25g based on the results each group records,which group makes the most precise measurement of the object
Answer:
This question lacks options, the options are:
A. Group C: 32.1 g, 35.0 g, 25.0 g
B. Group B: 25.5 g, 25.0 g, 24.8 g
C. Group A: 28.5g, 28.4 g, 28.5 g
D. Group D: 20.0 g, 25.0 g, 30.09
The answer is C. GROUP A
Explanation:
Precision in measurements refers to the degree of closeness between the repeated or measured values irrespective of how close they are to the true or accepted value, which is 25g in this case.
The precision of a measurement can be determined by simply finding the range (highest - lowest) of the measurements. The lowest range represents the most precise. The measurements for each group are:
Group C: 32.1 g, 35.0 g, 25.0 g
Range = 35.0 - 25.0 = 10g
Group B: 25.5 g, 25.0 g, 24.8 g
Range = 25.5 - 24.8 = 0.7g
Group A: 28.5g, 28.4 g, 28.5 g
Range: 28.5 - 28.4 = 0.1g
Group D: 20.0 g, 25.0 g, 30.09
Range = 30.09 - 25.0= 5.09g
Based on the ranges of the measurements in each group, one would notice that Group A has the lowest range (0.1g), hence, GROUP A is the most precise.
Answer: group A
Explanation: I got the answer right on my quiz.
In a short paragraph, explain one thing you've learned from the course this year.
Answer:
ive learned about the chart , ive learned about the coolest chemicle reactions and how. the can change colors , ive also learned that chenistrey is all around us since the beginning of life ,and how liquid can turn solid
Explanation:
what mineral is least important to plant growth
a. Nitrogen
b. Phosphorus
c. Potassium
d. Sodium
Answer:
sodium
Explanation:
nitrogem, phosphorous and potassium are very important to plant growth, but sodium isnt necessary.
Answer:
the answer is sodium hope this helps
-
Rocks found in streams can have rough edges and sharp grooves. What is the process that roughened the edges and caused the grooves
Answer:
Metamorphism
Explanation:
Rocks found in streams can have rough edges and sharp grooves. Metamorphism roughened the edges and caused the grooves.
What is rock?Rock is a naturally occurring mineral aggregate that is cohesive and composed of one or even more minerals. These aggregates often take the shape of recognisable and mappable volumes and are the fundamental building block of the solid Earth.
Igneous rocks are the ones that develop from magma, a liquid mixture of minerals that form rocks as well as frequently volatile substances like gases and steam. Igneous rocks are created at high temperatures because the minerals that make up its components are crystallized form molten material. Rocks found in streams can have rough edges and sharp grooves. Metamorphism roughened the edges and caused the grooves.
Therefore, metamorphism roughened the edges and caused the grooves.
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Belinda observes that the reaction 2H₂O + 0₂ #2H₂O₂ appears to have
stopped, because the concentrations of reactants and products are not
changing. Which statement is true at this point in the reaction?
A. Molecules of H₂O₂ are forming only when the reaction vessel is
disturbed.
B. Molecules of H₂O₂ have stopped forming.
C. Molecules of H₂O₂, H₂O, and O₂ are still forming.
D. Molecules of H₂0 and 0₂ have stopped forming.
Molecules of H₂0 and 0₂ have stopped forming is statement is true at this point in the reaction.
Option D is correct
Write about reactants and products using an illustration.Products are the byproducts of a chemical reaction—new substances created. For instance: When two sodium atoms and two chlorine atoms react, they produce sodium chloride, a totally new molecule (two atoms).
In a chemical equation, what are the reactants and products?Chemical reactions are started by reactants, or substances. Products are the chemical species that remain after the reaction has been fully finished.
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What state of matter is steam?
A. Gas
B. Liquid
C. Solid
D.Transitive
Answer:
Steam is an invisible gas
Explanation:
so A. Gas
Answer:
gas
Explanation:
Enter a balanced chemical equation for the combustion of gaseous methanol. Express your answer as a chemical equation. 2CH_3OH (g) + 3O_2 (g) rightarrow 2CO_2 (g) + 4H_2O(g) The table below lists the average bond energies that you would need to determine reaction enthalpies. Bond energy in CO_2 is equal to 799 kJ/mol Use bond energies to calculate the enthalpy of combustion of methanol in kJ/mol. Express your answer as an integer and include the appropriate units.
A balanced chemical equation for the combustion of gaseous methanol is:2CH3OH (g) + 3O2 (g) → 2CO2 (g) + 4H2O(g).
Bond energy in C-H bonds is equal to 413 kJ/mol. Bond energy in O-H bonds is equal to 463 kJ/mol.Let us use Hess’s Law for the calculation of enthalpy of reaction.
The enthalpy of combustion of methanol can be given as follows: H = [2 × BE(C=O)] + [4 × BE(O-H)] - [2 × BE(C-H)] - [3 × BE(O=O)]Here, BE stands for bond energy. H = [2 × 799 kJ/mol] + [4 × 463 kJ/mol] - [2 × 413 kJ/mol] - [3 × 498 kJ/mol]H = -726 kJ/mol Thus, the enthalpy of combustion of methanol is -726 kJ/mol.
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which of the following is a combustion reaction ? ( please answer asap !! ) <3
Answer: 3
Explanation:
A steam engine accepts heat during isothermal expansion at 250 °C and discards heat through isothermal compression at 25 °C. The magnitude of the entropy change during the isothermal compression step is 750 J/K. The efficiency of the steam engine is 65% of the maximum attainable theoretical efficiency. Calculate the total work produced by the engine. [12 marks]
The total work produced by the steam engine needs to be calculated and given that the steam engine accepts heat during isothermal expansion at 250 °C and discards heat through isothermal compression at 25 °C.
The magnitude of the entropy change during the isothermal compression step is 750 J/K. The efficiency of the steam engine is 65% of the maximum attainable theoretical efficiency. Given that the efficiency of the steam engine is 65% of the maximum attainable theoretical efficiency.
Hence, the actual efficiency will be:
η_actual = η_max × 0.65Where,
η_max is the maximum attainable theoretical efficiency.
η_actual = 0.65 × η_maxNow,
the efficiency of a Carnot engine (η_Carnot) can be given as:η_Carnot = 1 - (T_cold / T_hot)Here, T_hot and T_cold are the temperatures of the hot and cold reservoirs respectively.
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Work is a measure of the energy transfer that occurs when an object is moved against a force. Work is defined as the product of the force applied to an object and the displacement of the object in the direction of the force. Hence the total work produced by the engine is 47,175 J.
1. Converting the temperatures from degrees Celsius to Kelvin.
T1 = 250 °C + 273.15 K = 523.15 K
T2 = 25 °C + 273.15 K = 298.15 K
2. The maximum attainable theoretical efficiency.
ηmax = 1 - T2 / T1 = 1 - 298.15 / 523.15 = 42.9%
3. The efficiency of the steam engine.
η = 0.65 * ηmax = 0.65 * 42.9% = 27.7%
4. The entropy change during the isothermal expansion step.
dS = 750 J/K
5. The total work produced by the engine.
W = η * (T1 - T2) * dS = 0.277 * (523.15 - 298.15) * 750 J/K = 47,175 J
Therefore, the total work produced by the engine is 47,175 J.
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If a gas occupies 1.5 liters at a pressure of 3.0 atm, what will be its pressure at a volume of 2.0 liters?
Answer:
P2 = 2.25 atm
Explanation:
Given:
V1 = 1.5 L. V2 = 2.0 L
P1 = 3.0 atm. P2 = ?
Use Boyle's law and solve for P2:
P1V1 = P2V2
or
P2 = (V1/V2)P1
= (1.5 L/2.0L)(3.0 atm)
= 2.25 atm
Using only pencil and paper calculations, Arrhenius concluded that a doubling of the carbon dioxide concentration would raise global temperatures by about _____.
Using only pencil and paper calculations, Arrhenius concluded that a doubling of the carbon dioxide concentration would raise global temperatures by about 5-6 degrees Celsius.
In 1896, Swedish chemist аnd eventuаl Nobel Prize winner Svаnte Аrrhenius cаlculаted thаt if the аmount of cаrbon dioxide gаs in the аtmosphere were to double, globаl temperаtures would rise 5-6°C (9-11°F). Аnd by pаper аnd pencil аnd extrаordinаrily brilliаnt insight, understаnding how cаrbon dioxide аbsorbs pаrt of the rаdiаtion from Eаrth bаck into spаce.
Аrrhenius wаs аble to cаlculаte аstoundingly thаt if the cаrbon dioxide were to increаse significаntly in the аtmosphere аnd Аrrhenius himself used the stаndаrd of cаrbon dioxide doubling compаred to its bаseline level аnd he аlso looked аt whаt would hаppen if cаrbon dioxide hаlved compаred to the bаseline level thаt the temperаture chаnge thаt would result from thаt would be pretty significаnt.
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~Easy Points~.........what does H2o stand for ?
PLEASE HELPPPP I WILL GIVE BRAINLIST
The possible values of the quantum numbers are:
Orbital shape quantum number l: 0, 1, 2, 3, 4, or 5.
Magnetic quantum number m: -l to +l.
Spin quantum number, s: +1/2 or -1/2.
What are the azimuthal, magnetic, and spin quantum numbers of the valence electrons in an atom with principal quantum number, n = 6?For the principal quantum number n = 6, the possible values of the azimuthal (orbital shape) quantum number l are 0, 1, 2, 3, 4, and 5.
The magnetic quantum number m can have values ranging from -l to +l, inclusive.
The spin quantum number, s can be either +1/2 or -1/2.
So, the valence electrons in an atom with principal quantum number n = 6 can have the following quantum numbers:
Azimuthal quantum number, l can be 0, 1, 2, 3, 4, or 5.
Magnetic quantum number, m can range from -l to +l, inclusive.
Spin quantum number, s can be either +1/2 or -1/2.
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What are the most common types of buffer overflow attacks?
The most frequent form of buffer overflow attack, called a stack overflow, involves a buffer overflow in the top of the stack. This kind of attack targets information on the heap, an open memory pool.
Why do cybercriminals employ buffer overflow?When a hacker takes advantage of the code mistake to carry out a malicious action and breach the affected system, it is called a buffer overflow attack. The hacker changes the app's execution path and overwrites some of its memory.
What kind of attacks use buffer overflows?When more data is loaded into a fixed-length memory than the reader can hold, it overflows or overruns. which, by overflowing into neighboring memory space, corrupts or overwrites the data stored in that region, which must go someplace.
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8. Well-aerated soils have the _______________ smell of good soil.
9. Loam soil contains 10 to 20 percent _______________ , 40 percent _______________ and 40 percent _______________ .
Answer:
9 is clay, silt, sand in that order
Explanation:
Loam soil contains 10 to 20 percent clay, 40 percent silt and 40 percent sand. Less than 50% of the soil is made up of minerals; the remainder is made up of organic matter and void space.
What is Loam soil?Clay, sand, plus silt are the three minerals that make up loam soil. Loam is the best soil for growing plants when mixed in the appropriate amounts. Less than 50% of the soil is made up of minerals; the remainder is made up of organic matter and void space.
In loam soil, little will grow without the latter two. The ideal combination of clay, sand, plus silt will provide the void where minerals, organic materials, water, and air may support life. Loam soil contains 10 to 20 percent clay, 40 percent silt and 40 percent sand. Basalt transforms into clay-like soil, whereas granite decomposes into silty sands.
Therefore, loam soil contains 10 to 20 percent clay, 40 percent silt and 40 percent sand.
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Which phrase describes transmutation?(1 point)
the conversion of an atom of one element into a different element through nuclear changes
the conversion of energy to matter through chemical changes
the conversion of protons to neutrons through nuclear changes
the conversion of one substance to another through chemical changes
Help plss quick
thx
The phrase that describes transmutation is ; ( A ) The conversion of an atom of one element into different element through nuclear changes.
Transmutation is simply the change of an element to another element, transmutation occurs at the nucleus of the atom of an element and this process is initiated through nuclear reaction ( radioactive decay ).
Therefore the conversion of an atom of one element into different element through nuclear changes summarizes the term "transmutation".
Hence we can conclude that the phrase that describes transmutation is the conversion of an atom of one element into different element through nuclear changes.
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Answer:
Unit 4 Lesson 2:
Energy Release Quick Check
1. 138
2. The conversion of an atom of one element into a different element through nuclear changes.
3. A nuclear equation is balanced according to mass number. A chemical equation is balanced according to the total mass before and after the change.
4. 82
5. Some of the matter is converted to energy.
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Give the relative rates of reaction of the four carboxylic acid derivatives below with methylamine to give an N-methyl amid Most reactive 2nd most reactive 3rd most reactive Least reactive
The second most reactive of the four carboxylic acid derivatives' relative reaction rates.
What do carboxylic acids do in the body?However, carbonic acid, not carboxylic acid, is present in human blood. It performs its function in the respiratory system, where it is in charge of concluding the hormonal process that enables breathing. The process is as follows: Blood is transported to the tissues and organs after it has been oxygenated.
Is carboxylic acid bad for people?The screening assessment resulted in the conclusion that none of the four chemicals in the carboxylic acid group are hazardous to the environment or to human health at the present exposure levels.
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493 g water react with 316 g aluminum sulfide. Which is the limiting reactant? Al2S3+6H2O→2Al(OH)3+3H2S
In conclusion, aluminum sulfide is the limiting reactant, and we will run out of it before all the water can react. The reaction will produce 2 moles of aluminum hydroxide and 3 moles of hydrogen sulfide, according to the stoichiometry of the balanced equation.
To determine the limiting reactant in this chemical reaction, we need to use stoichiometry. Stoichiometry is a calculation method that helps us find the relationship between the amounts of reactants and products in a chemical reaction. In this case, we have 493 g of water and 316 g of aluminum sulfide.
First, we need to convert the mass of each substance to moles using their respective molar masses. The molar mass of water is 18 g/mol, and the molar mass of aluminum sulfide is 150 g/mol.
- Moles of water = 493 g / 18 g/mol = 27.39 mol
- Moles of aluminum sulfide = 316 g / 150 g/mol = 2.11 mol
Next, we need to use the balanced chemical equation to find out how many moles of each substance are required for the reaction. From the balanced equation, we can see that 6 moles of water react with 1 mole of aluminum sulfide to produce 2 moles of aluminum hydroxide and 3 moles of hydrogen sulfide.
So, for 2.11 mol of aluminum sulfide, we need 6 x 2.11 = 12.66 mol of water. But we only have 27.39 mol of water, which is more than enough to react with the 2.11 mol of aluminum sulfide. Therefore, water is not the limiting reactant in this reaction.
On the other hand, for 27.39 mol of water, we need 1/6 x 27.39 = 4.57 mol of aluminum sulfide. However, we only have 2.11 mol of aluminum sulfide, which is not enough to react with all of the water. Therefore, aluminum sulfide is the limiting reactant in this reaction.
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HELP ASAP PLEASE! PLEASE
FIll in the blank
your answer will be Carbon
I just got help from a friend!
How is a precipitate evidence for a chemical reaction?
Formation of precipitate is usually an evidence of a chemical change. The precipitate is a new substance that gets created due a chemical reaction between two or more different substances. The precipitate can be the formation of a solid within a liquid or the formation of a solid within a solid due to a chemical reaction or change. The solid formation within a liquid is known as precipitate. This kind of chemical reaction can be seen in normal and daily life, as well as in laboratories.
How many atoms are in 0.96 mol S?
Answer:
1???
Explanation:
a policeman was working at night and was paid 1 mole per hour, he was paid in grams according to calcium [40 Ca]. at the end of a 10 hour shift, he collected his pay and was given 0.4kg. is this the correct amount?
No, the amount given to the policeman at the end of his 10-hour shift, which is 0.4 kg, is not the correct amount based on the payment rate of 1 mole per hour.
To determine if the amount is correct, we need to convert the given mass of 0.4 kg to moles using the molar mass of calcium [40 Ca].
The molar mass of calcium is approximately 40.08 g/mol. Since the atomic mass of calcium is close to 40 g/mol, we can assume that the given molar mass refers to calcium-40, denoted as [40 Ca].
To convert the mass to moles, we can use the formula:
moles = mass (in grams) / molar mass
moles = 0.4 kg * 1000 g/kg / 40.08 g/mol
moles ≈ 9.98 mol
Therefore, the amount of calcium [40 Ca] the policeman received after his 10-hour shift is approximately 9.98 moles, not 1 mole per hour as stated in the payment rate.
Thus, the amount given to him is significantly higher than the correct amount. It appears there may have been an error in the payment calculation or a misunderstanding regarding the payment rate.
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A hot day in july in utah typically reaches 39 degrees c. what is this in kelvin?
A hot day in july in utah typically reaches 39 degrees c. Its kelvin will be 312 K.
Scientists adopted the Kelvin temperature scale because they desired a scale where 0 depicts the total lack of thermal energy. The amount of material vibrations needed to produce these thermal excitations decreases as the temperature decreases.
The Celsius scale and the Kelvin scale are comparable. The freezing point of water throughout the Celsius scale is zero degrees. The coldest conceivable temperature, or "absolute zero," has been defined as the zeroth point on the Kelvin scale.
It is given that, T = 39 degree c
and it is known that 1 degree = 273 K
Hence, 39 degrees c = 39 +273 = 312 K.
Therefore, A hot day in july in utah typically reaches 39 degrees c. Its kelvin will be 312 K.
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A lump of zinc is tossed into a beaker of 500L of 14M hydrochloric acid. this reaction produces Hydrogen Gas and zinc (II) chloride. If the hydrogen gas is combusted and produces 645L of water vapor at 400 kelvin and 1.75 atm, what is the mass of the zinc?
If the hydrogen gas is combusted and produces 645L of water vapor at 400 kelvin and 1.75 atm, 2796.96 g mass of the zinc is produced .
Using the ideal gas law equation:
PV = nRT
n = (PV) / (RT)
= (1.75 atm * 645 L) / (0.0821 atm·L/(mol·K) * 400 K)
= 42.71 moles
the balanced equation for the reaction between zinc and hydrochloric acid:
Zn + 2HCl -> \(ZnCl_{2}\) + \(H_{2}\)
1 mole of zinc produces 1 mole of hydrogen gas. Therefore, the moles of zinc are also 42.71.
The molar mass of zinc is 65.38 g/mol.
Mass of zinc = moles of zinc * molar mass of zinc
= 42.71 moles * 65.38 g/mol
= 2796.96 g
Therefore, the mass of the zinc is 2796.96 grams.
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Which accounts for the highest water withdrawals in the United States?(1 point)
Answer:
Agriculture accounts
Answer: Thermoelectric power
Explanation:
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in dinitrogen monoxide (nitrous oxide, laughing gas) one of the nitrogens is the central atom, with the other n and o being terminal atoms. what is the electron-domain geometry about the central atom of n2o?
The electron-domain geometry around the central nitrogen atom in dinitrogen monoxide (N2O) is linear.
This is because there are two electron domains around the central nitrogen atom: one from the two nitrogen-oxygen bonds and one from the lone pair of electrons on the nitrogen atom.
The electron-domain geometry is determined by the arrangement of these electron domains, regardless of whether they are bonding or nonbonding pairs.
In N2O, the lone pair of electrons and the two nitrogen-oxygen bonds are arranged in a straight line, giving the molecule a linear shape. This is in contrast to the molecular geometry of N2O,
which is bent due to the repulsion between the lone pair of electrons and the nitrogen-oxygen bonds. Understanding the electron-domain geometry is important for predicting the shape and properties of molecules, as well as understanding their reactivity and behavior.
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A certain hydrocarbon has a chemical composition of 79.85% of carbon and 20.15% of hydrogen. The molar mass is 60.16 g/mol. What is the molecular formula for this compound
The molecular formula for the compound is \(C_{4} H_{8}\) .
Given:% of C = 79.85%
% of H = 20.15%
Let the mass of the compound be 100g, then
Mass of C = 70.85 g
Mass of H = 20.15 g
Molar mass = 60.15 g/mol
Moles of Carbon = \(\frac{79.85}{12.01 g/mol}\)
= \(6.64 mol\)
Moles of Hydrogen = \(\frac{20.15}{1.00794 g/mol}\)
= \(19.99 mol\)
And we divide both sides by the lower quantity;
\(C_{\frac{6.64 mol}{6.64 mol} } H_{\frac{19.99 mol}{6.64 mol} }\) ≅ CH₂
And \((empirical formula)_{n} = molecular formula\)
60.15 g/mol = n × ( 12.01 + 2 × 1.00794)
n = 4
Therefore, the molecular formula for the compound is \(C_{4} H_{8}\) .
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1. Is the reaction between magnesium and oxygen in the air spontaneous?
Answer:
Once ignited, a ribbon of magnesium metal burns freely in air to form solid magnesium oxide in the form of a white powder. The reaction is plainly spontaneous even though ΔS is negative.
how much energy is required to vaporize 500 grams of water? the molar mass of water is 18.02 g/mol. the heat of vaporization of water is 40.67 kj/mol. group of answer choices 1128 kj 1280 kj 156.7 kj none of them
The amount of energy required to vaporize 500 grams of water is 1128 KJ. when the heat of vaporization of water is 40.67 kj/mol.
The process of turning a liquid at its boiling point into a gas involves the absorption of energy. The temperature of a boiling liquid stays constant, just like with a solid's melting point, and energy must be added to cause the state to change. The heat that one mole of a substance absorbs during the transition from a liquid to a gas is known as the molar heat of vaporisation (Hvap).
The given data is
amount of water = 500 grams
molar mass of water = 18.02 g/mol
heat of vaporization of water \(H_{vap\\}\) = 40.67 kj/mol
The vaporization's molar heat,\(H_{vap\\}\)
The molar enthalpy of vaporisation, measures the amount of energy required to vaporise one mole of a given substance at its boiling point.
In the example of water, a molar heat of vaporisation of 40.67 kJ /mol 1 indicates that 40.67 kJ/mol of heat must be applied in order to bring 1 mole of water to a boil at its typical boiling point of 100 C.
So,
for calculating the mass of water to moles by using its molar mass:-
500*\(\frac{1}{18.02}\) = 27.74
So, the energy requires is :
27.74*\(\frac{40.67}{1}\) = 1128 KJ
Hence, the energy required to vaporize 500 grams of water is 1128 KJ.
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How does width affect capillary rise?
The narrower the tube, the water will rise to a greater height.
Explanation:
Capillary rise is the height to which the water rises within the tube, and decreases as the width of the tube increases.