Physiological adaptations such as increased cardiac output, capillary density, and muscle oxidative capacity cause training-induced changes in VO₂ max.
VO₂ max is the maximum amount of oxygen that an individual can utilize during exercise and is a critical measure of endurance capacity. Training-induced adaptations can increase VO₂ max by improving the delivery and utilization of oxygen in the body. These adaptations include an increase in cardiac output, which is the amount of blood the heart pumps per minute, and an increase in capillary density, which enhances oxygen delivery to the muscles.
Additionally, training can increase muscle oxidative capacity, which enables muscles to use oxygen more efficiently during exercise. This can lead to an increase in VO₂ max within the first two weeks of training due to improved oxygen delivery to the muscles. VO₂ max results may differ between GXT on a treadmill vs. cycle ergometer because the type of exercise and muscle recruitment patterns may affect oxygen utilization.
While VO₂ max is an important measure of endurance performance, other factors such as lactate threshold, economy of movement, and mental toughness also influence performance.
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percent composition by mass of potassium in potassium carbonate
Answer:
56.58 percent
When 500. 0 g of water is decomposed by electrolysis and the yield of hydrogen is only 75. 3%, how much hydrogen chloride can be made if the yield of hydrogen chloride in the second reaction is 69. 8%? oxygen and chlorine are in excess.
If 500.0 g of water is decomposed by electrolysis and the yield of hydrogen is only 75.3%. The amount of hydrogen chloride that can be made if the yield of hydrogen chloride in the second reaction is 69.8% is 1,063g.
First we should calculate the moles of water, hydrogen:
nH₂O=mass H₂O/MassMolar H₂O
nH₂O=500.0g/18.0g/mol
nH₂O=27.76mol
moles of hydrogen gas:
nH₂=nH₂×1
nH₂=27.76mol×1
nH₂=27.76mol
Theoretical yield of hydrogen gas woulld be:
nH₂=mH₂/MMH₂
27.76 mol=m₂/2.016g/mol
m₂=27.76mol×2.016g/mol
m₂=55.96g
then we can calculate the actual yield of hydrogen gas:
Percent yield=Actual yield/Theoretical yield×100%
75.3%=Actual yield55.96g×100%
0.753=Actual yield55.96g
Actual yield=0.753×55.96g
Actual yield=42.1g
Number of moles of actual yield:
nH₂=mH₂/MMH₂
nH₂=42.1g/2.016 g/mol
nH₂=20.9mol
Number of moles of hydrogen chloride:
nHCl=nH₂×2
nHCl=20.9mol×2
nHCl=41.8mol
Theoretical yield of hydrogen chloride:
nHCl=mHCl/MMHCl
41.8mol=mHCl/36.46g/mol
mHCl=41.8mol×36.46g/mol
mHCl=1,524g
Actual yield of hydrogen chloride:
Percent yield=Actual yield/Theoretical yield×100%
69.8%=Actual yield/1,524 g×100%
0.698=Actual yield/1,524g
Actual yield=0.698×1,524g
Actual yield=1,063g
Therefore the hydrogen chloride that can be made is 1,063g.
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What changes must a SOLID undergo to become a LIQUID
Answer:
Melting; increase (more heat) in temperature.
Suppose, in the near future, the problems with creating energy through nuclear fusion reactions are overcome. What
are some of the advantages of using a fusion reactor to produce electricity?
Answer:
Nuclear Fusion reactions power the Sun and other stars. In a fusion reaction, two light nuclei merge to form a single heavier nucleus.
Explanation:
What do you call the variable exerted by gas molecules in a specific area?
The variable exerted by gas molecules in a specific area is called pressure.
THE PRESSUREPressure is a measure of the force exerted by gas molecules on the walls of the container they are in. It is typically measured in units of Pascals (Pa) or pounds per square inch (psi). The pressure of a gas is determined by the number of molecules present in a given volume, as well as the velocity of those molecules.
At higher temperatures, gas molecules move faster and therefore exert a greater force on the walls of the container, resulting in higher pressure. At lower temperatures, gas molecules move more slowly and exert a lesser force, resulting in lower pressure. Additionally, increasing the number of molecules in a given volume will also increase the pressure.
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Explain what happens to dry ice when it is exposed to air. What does it look like? Please write two
to three sentences about how this happens.
Dry ice, also known as solid carbon dioxide, sublimes when exposed to air. As dry ice sublimes, it appears to be "smoking" or "fogging" due to the condensation of the gaseous carbon dioxide in the air.
What is dry ice?Dry ice, also known as solid carbon dioxide, is a type of carbon dioxide that is in a solid state at temperatures below -109.3°F (-78.5°C). Unlike regular ice, which is made of water, dry ice is made of carbon dioxide. Due to its extremely low temperature, it is used primarily as a cooling agent, and often used to preserve food and medical products during transportation. It can also be used as a cleaning agent in industrial settings to remove oil and grease from machinery. Dry ice is also used in the dry ice blasting process which is an alternative to traditional cleaning methods like sand blasting and soda blasting. Dry ice is not stable at ambient temperature and pressure, it sublimes, meaning it goes from a solid to a gas without going through the liquid phase. This process causes it to shrink and disappear over time.To learn more about dry ice refer:
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one bonding pairs Complete and correctly sequence the steps for drawing Lewis structures. Drag the text blocks below into their correct order. surrounding Place the atoms relative to each other. Place the atom with lower group number in the center because it has the higher electronegativity. If atoms add have the same group number, place the atom with the higher period number in the center higher Determine the total number of valence electrons available. For multiple polyatomic ions, add one electron for each negative charge, or subtract one electron for each positive charge. octet Distribute the remaining electrons as pairs so that each atom ends up with eight electrons (or single two for H). First place tone pairs on surrounding more electronegative) atoms to give each an ostet. If any electrons remain, place them on the central atom. Then check that each atom has eight eight electrons four two singles lone valence subtract of the central atom still does not have an octet, make a multiple bond by changing a lone pair from one of the surrounding atoms into a bonding pair to the central atom. six more less central Draw a single bond from each surrounding atom to the central atom, and add two valence electrons for each bond. lower core
1) Place the atoms in relation to one another. Because it has the lowest electronegativity, the atom with the lowest group number should be placed in the centre. If two atoms have the same group number, the atom with the lowest period number should be placed in the middle.
2) Determine the total number of accessible valence electrons. Add one electron for each negative charge or remove one electron for each positive charge in the case of polyatomic ions.
3) Distribute the remaining votes in pairs so that each atom has eight electrons (or two for H). To begin, arrange lone pars on surrounding (more electronegative) atoms to form an octet. Place any remaining electrons on the centre atom. After that, double-check that each atom contains eight electrons.
4) If the centre atom still lacks an octet. Change a lone pair from one of the surrounding atoms into a bonding pair to the centre atom to form a multiple bond.
5) Draw a single link from each surrounding atom to the core atom, and for each bond, add two valence electrons.
Lewis structures are diagrams that illustrate the bonding between atoms in a molecule as well as any lone pairs of electrons that may exist. They are also known as Lewis dot formulae, Lewis dot structures, electron dot structures, or Lewis electron dot structures (LEDS). A Lewis structure can represent any covalently attached molecule as well as coordination compounds. The Lewis structure was named after Gilbert N. Lewis, who proposed it in his 1916 work The Atom and the Molecule. Lewis structures extend the notion of the electron dot diagram by adding lines between atoms to represent shared pairs in a chemical bond.
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Beryllium has 2 valence
electrons. Which element could
pair with it in a 1 Be : 1 atom
ratio?
A. Li (1 valence electron)
B. P (5 valence electrons)
C. Br (7 valence electrons)
D. Se (6 valence electrons)
Beryllium with 2 valence electrons would be able to pair with Se with 6 valence electrons. Option D.
Formation of bondsAtoms form bonds with one another based on the number of valence electrons present in their outermost shell. Electrons are either donated, received, or paired.
In order for bonds to form, the participating atoms try to assume an octet structure, In other words, each atom tries to have a completely filled outermost shell. Thus, atoms with only a few electrons in their outermost shells readily donate them while those with just a few electrons remaining to fill up their outermost shell readily accept them.
Be has 2 outermost electrons, Se has 6. Be will readily donate the 2 outermost electrons while Se will readily accept 2 electrons for completely filled shell.
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In an ionic bond, how do you tell the number of electrons transferred from atom to atom. Would it be two ions formed in the reaction or no?
Example, Lithium + Chlorine
Answer:
Explanation:
In an ionic bond, atoms transfer electrons in order to achieve a stable electron configuration, also known as a full valence shell. The number of electrons transferred from one atom to another can be determined by the difference in their electron configurations.
In the example of lithium and chlorine forming an ionic bond, lithium (Li) has one valence electron and chlorine (Cl) has seven valence electrons. In order for both atoms to achieve a stable electron configuration, Li would transfer its one valence electron to Cl. This results in the formation of two ions: Li+ and Cl-.
It is important to note that for a reaction to be ionic, it must involve the transfer of electrons from one atom to another. In the case of Lithium and Chlorine it is ionic because electrons are transferred from Li to Cl.
aspirin is a weak acid with a pka of 3.5. at equilibrium, wwhat is the ratio of aspirin concentration in blood (ph
The H+ ions separate from the aspirin at pH higher than pKa and then become deprotanated-ve charge.
What is the ratio of aspirin concentration in blood?In the protonated form, aspirin is more easily absorbed as it is neutral at pH 1.5 and can easily pass through the lipid bilayer. The absorption in the stomach is very big.Aspirin, also known as acetylsalicylic acid (ASA), is a nonsteroidal anti-inflammatory drug (NSAID) used to reduce pain, fever, and/or inflammation, and as an antithrombotic. Specific inflammatory conditions which aspirin is used to treat include Kawasaki disease, pericarditis, and rheumatic fever.Aspirin is also used long-term to help prevent further heart attacks, ischaemic strokes, and blood clots in people at high risk.For pain or fever, effects typically begin within 30 minutes. Aspirin works similarly to other NSAIDs but also suppresses the normal functioning of platelets.One common adverse effect is an upset stomach.More significant side effects include stomach ulcers, stomach bleeding, and worsening asthma.Bleeding risk is greater among those who are older, drink alcohol, take other NSAIDs, or are on other blood thinners. Aspirin is not recommended in the last part of pregnancy.[tex]pH=pK\alpha +[/tex]㏒[tex]\frac{A-}{HA}[/tex]
㏒[tex]\frac{A-}{HA} =pH-pK\alpha[/tex]
㏒[tex][\frac{A-}{HA} ][/tex]=1.5-3.5
[tex][\frac{A-}{HA} ]=10^{-2}[/tex]
[tex][\frac{A-}{HA}]=\frac{1}{100}[/tex]
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The acid in aspirin, acetylsalicylic acid, is very weak. Because of this, it must be more in unnionized form in the stomach's acidic pH. It must be more ionized for the intestine's alkaline pH.
Would you anticipate that an aspirin structure with a pKa lower 3.5 would be more easily absorbed in the stomach or small intestine?For the same pH range, the small intestine absorbs more nutrients than the stomach. The intestinal absorption of aspirin is greater than the stomach absorption of the drug at pH 3.5 or 6.5.
What in chemistry is a pKa?The base-10 negative logarithm pKa serves as the acid dissociation constant (Ka) of a solution. One way to gauge an acid's potency is by looking at its pKa value. A stronger acid is indicated by a lower pKa value. A lower value, for instance, signifies that the acid dissociates completely in water.
Ratio of aspirin in blood:[tex]pH = pKa + log\frac{A-}{HA}[/tex]
[tex]log\frac{A-}{HA} = pH - pKa[/tex]
[tex]log\frac{A-}{HA} = 1.5 - 3.5[/tex]
[tex][\frac{A-}{HA}] = 10^{-2}[/tex]
[tex][\frac{A-}{HA}] = \frac{1}{100}[/tex]
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Which numerical setup can be used to calculate the heat energy required to completely melt 100. Grams of h2o(s) at 0oc?.
33.4 kilojoules of heat are necessary to melt 100 grams of ice therefore, option A is the right choice.
The heat that is required to break the intermolecular connections in a substance as it is transformed from one phase to another is referred to as the latent heat of that substance. The temperature does not rise due to the presence of latent heat.
Throughout the process of phase changeover, the temperature of the substance does not change. The amount of heat that must be applied in order to turn 1 g of solid ice into liquid is referred to as the latent heat of the fusion of ice.
Mass of ice = 100g
Latent heat of fusion of ice = 334 Joules/g
H = mL
H = 100g × 334 J/g
H = 33400 J or 33.4 KJ
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Draw the structure of cyclohexane.
Explanation:
Cyclohexane ends with an -ane, which means that we have an alkane. An alkane consists of carbons and hydrogens with only single bonds. Hex means six, so there are six carbons. Cyclo means we have a ring, which is the six carbons each with two hydrogens, all single bonds.
Each carbon atom can form bonds with two hydrogens because carbon can form four bonds, which are from the two carbons and two hydrogens.
Under what conditions in the ideal gas assumption suitable for real gases How do you relate between R and Ru?
The ideal gas assumption is suitable for real gases when the temperature is high and the pressure is low.
The ideal gas law relates the pressure, volume, and temperature of a gas to the number of molecules present in a given volume. The constant R is the ideal gas constant and Ru is the universal gas constant.
These two constants are related by the equation Ru = R/M, where M is the molar mass of the gas. So, R is the gas constant for a particular gas, while Ru is the gas constant for all gases.
The ideal gas law is valid when the temperature is high, the pressure is low, and the volume of the gas is large compared to the volume of the molecules.
In these conditions, the ideal gas model is suitable for real gases because the molecules don’t interact significantly with each other and the volume of the gas is much larger than the volume of the molecules. Hence, the ideal gas law accurately models the behavior of the real gas.
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A helium balloon has a volume of 735 ml at ground level. The balloon is transported to an elevation of 5 km, where the pressure is 0. 8 atm. At this altitude, the gas occupies a volume of 1286 ml. Assuming that the temperature is constant, what was the ground level pressure?.
The ground pressure on that condition will be 1.4 Atm. The condition of that space is isotherms, to solve it we use Boyle's law in isotherms condition.
How to find the ground level pressure?To solve this problem we are using Boyle's law. As Boyle's law state that " a gas's pressure and volume are inversely proportional" which is formulated as P1 x V1 = P2 x V2. As per data given: early volume(V1) = 735 mL; pressure(P2) = 0.8 atm; and volume(V2) = 1286 mL. The calculation will be:
P1 x V1 = P2 x V2
P1 x 735 = 0.8 x 1286
P x 735 = 1028.8
P = 1.4 Atm
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How many cyanide atoms are in gallium cyanide
How many cyanide atoms are in gallium cyanide?
51 CGaN
Draw The Lewis Structure Of COF2. Include Lone Pairs.
The Lewis Structure Of COF2 is C: O=F-F: .The Lewis structure of COF2 consists of one carbon atom, two oxygen atoms, and two fluorine atoms. The carbon atom is the central atom and is bonded to the two oxygen atoms.
In turn, each oxygen atom is bonded to one of the fluorine atoms. The Lewis structure indicates that each of the four atoms involved in the molecule has an octet of electrons. The carbon atom has 4 valence electrons and each oxygen atom has 6 valence electrons. Thus, the carbon atom and each oxygen atom will form two covalent bonds with the fluorine atoms.
The two covalent bonds that the carbon atom forms with the oxygen atoms are single bonds, while the two covalent bonds that the oxygen atoms form with the fluorine atoms are double bonds. The structure also includes two lone pairs on the oxygen atoms. Lone pairs are unshared electrons that are held by atoms in a molecule. In the case of COF2, both oxygen atoms have two lone pairs of electrons. These lone pairs are not involved in any bonding and help to stabilize the molecule.
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How many grams of phosphoric acid are formed from 36.4 grams of calcium phosphate?
Answer: Calcium phosphate (Ca3(PO4)2) and phosphoric acid (H3PO4) are two different compounds.
Explanation: In order to determine how many grams of phosphoric acid are formed from 36.4 grams of calcium phosphate, we would need to know the reaction taking place and the stoichiometry of that reaction. Without that information, it is impossible to determine how many grams of phosphoric acid are formed.
Answer:
calcium phosphate (ca3(po4)2) and phosphoric acid(h3po4)
Use the amounts of each product and reactant
listed below to balance the equations for the
breakdown of sulphuric acid and sodium nitrate.
H₂SO4 + NaNO2 → HNO2 + Na2SO4
H₂SO4 = 588g NaNO₂ = 828g HNO₂ = 564g
Na₂SO4 = 384g
Answer:
H2SO4 + 2NaNO2 → HNO2 + Na2SO4
The balanced equation for the breakdown of sulfuric acid and sodium nitrate is:
H2SO4 + 2NaNO2 -> HNO2 + Na2SO4
This equation shows that for every one molecule of sulfuric acid (H2SO4), two molecules of sodium nitrate (NaNO2) are required to produce one molecule of nitrous acid (HNO2) and one molecule of sodium sulfate (Na2SO4).
In terms of mass, the equation shows that for every 588 grams of sulfuric acid, 828 grams of sodium nitrate are required to produce 564 grams of nitrous acid and 384 grams of sodium sulfate.
Consider the molecule c4H5n, which has the connectivity shown below.
After the Lewis structure for the molecule is completed, how many sigma and how many pi bonds are there in this molecule?
Express your answers as integers separated by a comma.
How many atoms in the molecule exhibit sp hybridization, sp^2 hybridization, and sp^3 hybridization?
Express your answers as integers separated by commas. Express your answers in the given order.
sp hybridization, sp^2 hybridization, and sp^3 hybridization:
The marketed medications with pyrrole ring systems are known to have a wide range of biological properties, including the antipsychotic, beta-adrenergic antagonist, anxiolytic, anticancer (leukemia, lymphoma, and myelofibrosis, among others), antibacterial, antifungal, antiprotozoal, antimalarial, and many more.
The relative abundances of the three identified C4H5 isomers vary depending on the type of precursor (1-butyne, 1,2-butadiene, and 1,3-butadiene). The overproduction of hydroxyhempyrolin is what causes pyrrole disorder (HPL). The HPL binds zinc and B6, preventing the body from utilizing them and causes their excretion in the urine and hair. HPL is a neurotoxic biomarker for oxidative stress. Kryptopyrrole testing in the urine is used to identify pyrrole disorders. The goal is to count the HPL molecules in your body. A high level could be a sign of pyrrole dysfunction.
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Let's shift the nitrogen and carbon atoms from left to right since the answer is 2,2,1. Three hydrogen atoms bonded to one carbon form an SP3 hybrid on carbon.
Carbon hybridised with carbon on both sides in SP. There is a triple bond tying these two carbon atoms together. Bonding between carbon atoms and N's SP hybridization Prior to N, the penultimate C is SP2 hybridised (2 bonds and 1 lone pair). The C and N in question have two bonds.
Answer: 2,2,1 Atoms, which are little bits of matter, are what distinguish one chemical element from the others. A negatively charged core nucleus and one or more orbiting electrons make up an atom. There may be the positively charged, somewhat massive protons and neutrons that make up the nucleus.
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What is the the number of 6p electrons in Po?
The number of 6p electrons in PO i.e. Polonium is four as the outer electronic configuration of Po is 6s^2 6p^4.
Po or Polonium in the periodic table belongs to the period 6 and group 16. As Po belongs to the period six thus we can take n=6. Also as the group of Po is 16 thus the element belongs to the p-block of the modern periodic table. By applying the orbital notation method we can find the formula as ns2np4. Putting the formula into the given element we can find the outer electronic configuration as 6s^2 6p^4 where p=4
We can understand that in the periodic table given by Mendeleev electronic configuration method is applied where it helps in understanding how in any atomic orbital electrons are distributed. The same is applied in the case of Polonium which helps in understanding that it has two 6s electrons and four 6p electrons.
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Please help me with this
8) Percent yield = (0.48 g / 36 g) x 100% = 1.33%
9) Percent yield = (248 g / 176 g) x 100% = 141%
10) Percent yield = (45 g / 120 g) x 100% = 37.5%
What is a chemical reaction's yield in percentage terms?The same units must be used for both the theoretical and actual yields (moles or grams). A chemical reaction produces 0.5 g of product. The calculated yield is 1.6 g at its highest. What is the reaction's yield in terms of percent? Actual yield minus theoretical yield equals 100% in percentage yield. The reaction's percentage yield is 31.25% as a result.
8) Known: 2 H2(g) + O2(g) → 2 H2O(1)
Unknown: percent yield
Steps:
Calculate the theoretical yield of water by using the balanced equation.
Compare the theoretical yield to the actual yield of water obtained from the experiment.
Use the formula: (Actual yield / Theoretical yield) x 100% = percent yield
Solution:
Theoretical yield of water = (2 moles H2 x 18 g/mol H2O) = 36 g
Actual yield of water = 0.48 g
Percent yield = (0.48 g / 36 g) x 100% = 1.33%
9) Known: 2 C2H6(g) + 7 O2(g) → 6 H2O(l) + 4 CO2(g)
Unknown: percent yield
Steps:
Calculate the theoretical yield of CO2 by using the balanced equation.
Compare the theoretical yield to the actual yield of CO2 obtained from the experiment.
Use the formula: (Actual yield / Theoretical yield) x 100% = percent yield
Solution:
Theoretical yield of CO2 = (2 moles C2H6 x (4 moles CO2 / 2 moles C2H6)) = 4 moles CO2
Theoretical yield of CO2 = 4 moles CO2 x (44 g/mol CO2) = 176 g
Actual yield of CO2 = 248 g
Percent yield = (248 g / 176 g) x 100% = 141%
10) Known: 4 NH3(g) + 5 O2(g) → 4 NO(g) + 6 H2O(1)
Unknown: percent yield
Steps:
Calculate the theoretical yield of NO by using the balanced equation.
Compare the theoretical yield to the actual yield of NO obtained from the experiment.
Use the formula: (Actual yield / Theoretical yield) x 100% = percent yield
Solution:
Theoretical yield of NO = (4 moles NH3 x (4 moles NO / 4 moles NH3)) = 4 moles NO
Theoretical yield of NO = 4 moles NO x (30 g/mol NO) = 120 g
Actual yield of NO = 45 g
Percent yield = (45 g / 120 g) x 100% = 37.5%
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Three 75.0g samples of copper, silver, and gold are available. Each of these samples is initially at 24.0°C, and then 2.00kJ of heat is applied to each sample. Which sample will end up at the highest temperature?
The temperature of the copper sample will be the highest.
What uses does copper have?
Due to its ductility and excellent conductivity, copper is mostly used in electrical generators, home and auto wiring, as well as the wires in electronics like radios, TVs, computers, lighting, and motors.
A metal or a nonmetal, is copper?
Just on Periodic Table of Elements, copper is the 29th element. It is regarded as a moderately, nonferrous, malleable metals with countless uses in the fields of electrical and electronics, plumbing, construction projects & architecture, business, transportation, & consumer and health items.
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How did ethanol use affect the shortage of corn available to consumers during and after the drought of 2012?.
Ethanol use was effect the shortage of corn available on those time because of corn is an ingredient to produce the ethanol. Hence, ethanol use was aligned with the rarity of corn availability on those time. the more ethanol was used, the more rare corn availability for consumer.
What is the effect of the drought?The drought is a condition where the area cant provide enough water supply for a long. Agriculture sector is the most affected sector when the drought occur. The drought cause crop failure, and this condition create domino effect on another sector such as food price get more expensive, and because of food get more expensive, buying power getting low cause small business out of business.
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5. A difference in air pressure creates what?
Wind results from a horizontal difference in air pressure and since the sun heats different parts of the Earth differently, causing pressure differences, the Sun is the driving force for most winds. 1.
What is meant by pressure?
The force delivered perpendicularly to an object's surface per unit area across which that force is dispersed is known as pressure (symbol: p or P).The pressure relative to the surrounding air is referred to as gauge pressure (sometimes spelled gauge pressure).Pressure is expressed using a variety of units. Some of these come from dividing a unit of force by a unit of area; the traditional unit of pressure in the imperial and U.S. customary systems is the pound-force per square inch (psi, symbol lbf/in2), whereas the SI unit of pressure, the pascal (Pa), is one newton per square metre (N/m2).To learn more about pressure refer to
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draw the line structure for ch3coh ch2ch3 2
Bond-line structures are presentations of molecules, where lines are drawn to represent the bonds between carbon atoms or between carbon atoms and heteroatoms (atoms other than C or H). Hydrogen atoms are not represented. Heteroatoms are identified by a symbol but carbon atoms are not. Carbon atoms are situated at the intersection of two lines.
A single bond is defined by one parallel line and a double bond by two parallel lines, and a triple bond by three parallel lines.
In the line-bonds formula, the organic structures of the compound are represented in such a way that covalent bonds are represented by a line and frame the structure by zig-zag straight lines which releases all the hydrogen atom.
In the attached picture there is the bond-line structure of the requested organic compound.
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A ga mixture containing oxygen, nitrogen, and He ha a total preure of 189. 9 kPa. If PO2 = 104. 6 kPa and PN2 = 13. 0 kPa, what i PHe ?
The partial pressure of helium (PHe) in this gas mixture is 72.3 kPa.
To find the partial pressure of helium (PHe) in a gas mixture containing oxygen, nitrogen, and helium, you can use the equation:
Total Pressure (PT) = PO2 + PN2 + PHe
Given that the total pressure of the mixture is 189.9 kPa, and the partial pressures of oxygen and nitrogen are given as 104.6 kPa and 13.0 kPa, respectively, you can use these values to solve for PHe.
PT = PO2 + PN2 + PHe
189.9 kPa = 104.6 kPa + 13.0 kPa + PHe
Solving for PHe:
PHe = PT - PO2 - PN2
PHe = 189.9 kPa - 104.6 kPa - 13.0 kPa
PHe = 72.3 kPa
So, the partial pressure of helium (PHe) in this gas mixture is 72.3 kPa.
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Analysis of a 10. 150 g sample of a compound known to contain only phosphorus and oxygen indicates a phosphorus content 0f 4. 433 g. What is the empirical formula of this compound?.
The empirical formula of the 10.150 g sample compound which is known to only contain phosphorus and oxygen shows that the phosphorus content 0f 4.433 g is P₂O₅.
An empirical formula is a compound's chemical formula that only specifies the ratios of the elements it contains and not the precise number or arrangement of atoms.
An unidentified substance weighs 10.15 g.
Phosphorus weighs 4.433 g in total.
Hence, 10.15 - 4.433 = 5.717
The oxygen mass will be 5.717g.
Determine the moles.
Number of moles of oxygen = mass / molar mass
= 5.717 / 16
= 0.357
Number of moles of phosphorus = mass / molar mass
= 4.433 / 31
= 0.143
Divide the moles by the minimum number of mole:
⇒ 0.357 / 0.143
= 2.496
⇒ 0.143 / 0.143
= 1
Divide the moles by two:
⇒ 2.496 x 2 = 5
=1 x 2 = 2
So, the empirical formula is P₂O₅.
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What is the percent composition by mass of aluminum in al2(so4)3 (gram formula mass = 342 grams)?.
The percent composition by mass of aluminum in al2(so4)3 (gram formula mass = 342 grams) is 15.8%.
Why is the formula of Aluminum sulphate Al2 SO4 3?Aluminum sulphate is an ionic compound, a combination of both positive and negative ions. Ions are charged atom, which may either be monatomic ions (single atoms) or polyatomic (multiple atoms combined to form a charged part). Aluminum forms a + 3 ion, Al+3, and sulphate is the -2 polyatomic ion, (SO4)-2
So there are two aluminum atoms, three sulfur atoms, and 12 oxygen atoms in a single unit of the compound Al2(SO4)3. This sums to 17. Therefore, there are 17 atoms in a single unit of the compound Al2(SO4)3. The formula for aluminum sulfate is Al2(SO4)3. Then, in a formula unit of Al2(SO4)3 there are two aluminum ions and three sulfate ions; or two aluminum, three sulfur, and twelve oxygen atoms.
Determination of percent composition of aluminum:Total amu of this compound = 342
Therefore, percent composition of Aluminum = 54/342 x100 = 15.8%
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A student looked up the naturally occurring isotopes of bromine and found the following information:
50.54% of the naturally occurring isotopes of bromine have an atomic mass of 78.92 u, while 49.46% of the naturally occurring isotopes of bromine have an atomic mass of 80.92 u.
Calculate the average atomic mass of bromine, showing all work:
The average atomic mass of bromine is derived from the isotopic masses and percentage abundance. The average atomic mass of bromine is 80.31 amu.
What are isotopes?Isotopes are atoms of same element with different atomic mass numbers. Almost all elements have two or more isotopes but not all of them are stable in nature.
The average atomic mass can be calculated from the isotopic mass and and percentage abundance as follows:
atomic mass = ∑ (isotopic mass × %abundance /100 )
Apply the isotopic mass and abundance of all isotopes given as follows:
atomic mass of bromine = (50.54/100 × 78.92 amu) + (49.96/100 × 80.92 amu) =80.31 amu.
Therefore, the atomic mass of bromine is 80.31 amu.
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What substances are produced when an acid reacts with base?
Answer:
Salt and water is produced.
For example:-
NaOH(base)+HCl(Acid)=>NaCl(salt)+H20(water)
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