Each gas dissolved in the blood diffuses between the blood and its surroundings based on differences in the partial pressure and diffusion occurs until equilibrium is reached.
What is the gas exchange in bloodstream?The gas exchange refers to the process by which oxygen is absorbed by red blood cells and carbon dioxide is removed through the respiratory system.
The process of gas exchange is carried out due to the differential diffusion rates of gases in the bloodstream (O2 and CO2), which facilitates the transference of these gases.
In conclusion, each gas dissolved in the blood diffuses between the blood and its surroundings based on differences in the partial pressure and diffusion occurs until equilibrium is reached.
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Adding heat to a substance group of answer choices sometimes does not result in a temperature change. always results in a temperature increase. sometimes results in results in a temperature decrease.
Sometimes adding heating of substance set of answer options does not cause a change in temperature. resulting in an increase in temperature every time. results occasionally in a drop in temperature.
A substance's atoms and molecules move more quickly when it is heated. Whether the substance is a solid, liquid, or gas, this occurs. However, the temperature does not always rise when more heating of substance is added. For instance, adding heat to boiling water will not raise its temperature. This occurs when the heating of the substance reaches its boiling point, which is for all vaporizable substances. The average kinetic energy of the molecules will fluctuate when a system gains or loses heat. So long as a phase shift is not taking place, heat transfer causes a change in the system's temperature.
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When 20. 0 g nh3 and 50. 0 g o2 are allowed to react, which is the limiting reagent?
When 20. 0 g NH₃ and 50. 0 g O₂ are allowed to react, NH₃ is the limiting reagent.
What is limiting reagent ?Limiting reagent is defined as that reactant in a chemical reaction which is completely consumed in reaction.
Given,
Mass of NH₃ = 20 g
Mass of O₂ = 50 g
Molecular mass of NH₃ = 14 + 7 = 17 g
Molecular mass of O₂ = 2 × 16 = 32 g
Mole = given mass/ molecular mass
Mole of ammonia = 20/17
= 1.17 mole
Moles of O2 = 50/32
= 1.56 mole
Chemical equation:
4NH₃(g) + 3O₂(g) ⟶ 2N₂(g) +6H₂O
From above reaction it is clear that 4 moles of NH₃ react with 3 moles of oxygen.
So, 1 mole of ammonia react with = 3/4 moles of O₂
= 0.75 moles of O₂
Also, 1.18 moles of ammonia react with
= 1.18 × 0.75
= 0.885 moles of O₂
Thus, from above we concluded that ammonia is completely consumed in reaction. Therefore ammonia is limiting reagent.
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Based on your experience, which reactions are likely to be self-sustaining? check all that apply. an engine with pistons rising and falling. burning gasoline in a car engine a pan full of eggs floating in water. hard-boiling an egg a space ship launch. thrusting a rocket into space
The reactions which are likely to be self-sustaining from my experience among the choices above is burning gasoline in a car engine a pan full of eggs floating in water
What is self sustaining?Self sustaining simply means a condition in which one is able to continue in a healthy state without an external support outside assistance.
So therefore, the reaction which are likely to be self-sustaining from my experience among the choices above is burning gasoline in a car engine a pan full of eggs floating in water
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Consider a 100-gram sample of radioactive cobalt-60.
How much time will it take before half the sample has decayed?
It will take 5.2 years to decay.
The half life of cobalt-60 is 5.2 years. The half life is the time taken for the mass of the substance to decrease by a half.
here, the amount of remaining substance is 50%,
so, [tex](\frac{1}{2} )^{n} = 0.5[/tex]
n. log (0.5) = log (0.5)
n = 1
So it would take 1 half lives to decay this much, which is 1 x 5.2 which is 5.2 years.
what do you mean by radioactive decay ?
The process through which an unstable atomic nucleus loses energy via radiation is known as radioactive decay, also known as nuclear decay, radioactivity, radioactive disintegration, or nuclear disintegration. A material that has unstable nuclei is considered as radioactive.
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500. ml of a solution containing 1. 5 m nh3(aq) is mixed with 500. ml of a solution containing 0. 50m of hcl(aq). what is the ph of the final solution? (kb(nh3) = 1. 8 x 10-5)
The pH of the solution is determined by the hydrogen ion concentration. The pH of the solution with 1.5 M ammonia and 0.50 M hydrochloric acid is 8.77.
What is pH?The potential of the hydrogen ion in the solution is called pH which determines the basicity and acidity of the solution.
Given,
The molar concentration of 500 mL ammonia = 1.5 M
The molar concentration of 500 mL hydrochloric acid = 0.50 M
Kb (NH₃) = 1. 8 x 10⁻⁵
First, pOH is calculated as,
pOH = pKb + log [NH₃][HCl]
= - log 1. 8 x 10⁻⁵ + log [1.5][0.50]
= - log 1. 8 x 10⁻⁵ + log [3]
= 4.744 + 0.477
= 5.221
Now, pH is calculated from pOH as,
pH = 14 - pOH
= 14 - 5.221
= 8.77
Therefore, 8.77 is the pH.
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Now, using your periodic table as a reference, type the symbols for the known elements into their appropriate groups and periods in the modified table below. Note that we’re using the international group numbers (1-18), followed by the American scheme for the A-group elements in parentheses.
The symbols for some known elements using the periodic table are given below
Groups/Period
H
He
Li
Be
B
C
N
O
F
Ne
Na
Mg
Al
SI
P
S
Cl
Ar
K
CA
What is an element?An element is a substance which cannot be split into simpler units by any ordinary chemical process
So therefore, the elements in the periodic table are classified based on their increasing atomic numbers.
The group is vertical representation of the elements
The periods is horizontal arrangements of elements in the periodic table
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Answer:
see attachment
Explanation:
plato users!!
An electron initially in a 4p state decays to a lower energy state. which energy state is forbidden?
The state of energy that is forbidden is 2p orbital. The correct option is b).
What is the energy state of electrons?The energy state of an electron depends upon the presence of the electron on the orbitals. Lower the energy they will be in the lower orbital. When they get higher energy they move to the higher orbital.
By using the Selection Rules for Electron Transitions
1.) ?l = +/- 1 and
2.) ?m = 0, +/- 1
The conservation of angular momentum is required by these laws. A photon's inherent angular momentum is 1. As 4p is higher than 2p and the electron is lowering its energy. So, it will go down to 2p orbital.
Thus, the correct option is b). 2p orbital.
The question is incomplete. Your full question is given below:
a) 3d
b) 2p
c) 1s
d) 2s
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Which type of nuclear decay is the radioactive isotope fe2659 likely to undergo?
Beta minus decay will be obtain in the radio-active isotope of Fe-26 power 59.
Whenever there are too many protons or even neutrons in a nucleus, one of the protons and neutrons will turn into the other, which is known as beta decay. During beta minus decay, a neutron transforms into a proton, electron, as well as antineutrino.
[tex]Fe_{26} ^{59}[/tex] → [tex]Co_{27} ^{59} +\beta_{1} ^{0}[/tex]
It can be seen that after the beta minus decay Fe changes into Co.
In beta decay , decrease in atomic number by one unit Fe atom get converted into Co atom.
Neutron-rich nuclei often decay by producing both an electron and an antineutrino.
Therefore, Beta minus decay will be obtain in the radio-active isotope of Fe-26 power 59.
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If the decomposition of a sample of k c l o 3 kclox3 produces 3. 29 g of o 2 ox2 , what was the mass (g) of the original sample?
The mass (g) of the original sample after decomposition is 8.3983 g.
A decomposition reaction can be described as a chemical reaction wherein one reactant breaks down into or extra merchandise.
explanation:
Reaction 2KClO₃ ⇒ 2KCl + 3O₂
moles 2 2 3
molar mass 122.55 74.55 32
Given, Mass of O₂ = 3.29g ⇒ moles of O₂
= (3.29/32) = 0.1028
3 moles of O₂ produced by 2 moles of KClO₃
Therefore, 0.1028 moles of O₂ produced by (2*0.1028/3) = 0.06853 moles of Kclo₃
Mass of KClo₃ in original sample is = moles * molar mass
= 0.06853 * 122.55
= 8.3983 g
A decomposition response occurs whilst one reactant breaks down into or extra merchandise. this may be represented through the general equation: XY → X+ Y. Examples of decomposition reactions consist of the breakdown of hydrogen peroxide to water and oxygen, and the breakdown of water to hydrogen and oxygen.
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Which salt gives the most basic 0. 1 m solution in water?
a. nacl
b. nano2
c. nh4cl
d. nh4no2
The salt gives the most basic 0. 1 m solution in water is NaNo₂.
What is the base?Basic solutions are those solutions in which the concentration of OH- ion will always be greater as compared to the concentration of H+ ion in the solution.
If the solution is basic so after the dissociation, the formation of a strong base and a weak acid is a must in the solution.
NaNo₂ gets dissociated in water in the form of NaOH and HNO₂ and NaOH is a strong base whereas HNO₂ is a weak acid due to which the solution becomes acidic.
Therefore, salt gives the most basic 0. 1 m solution in water NaNo₂.
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Select true or false: in the reaction ag (aq) cl–(aq) → agcl(s), ag acts as a lewis acid
In the given reaction, Ag is acting as Lewis acid. the given statement is true.
What is Lewis acid?A Lewis acid is a chemical substance with an empty orbital that can accept an electron pair from the a Lewis base to establish a Lewis adduct.
Because the silver atom has an open valence shell, AgCl is a Lewis acid. Lewis acid is an atom, ion, or molecule with an incomplete electron octet.
Even though Ag+ can accept an electron pair, it acts as a Lewis acid. It will then combine with chlorine and form AgCl.
Thus, the given statement is true.
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Which reactant is limiting if you begin with 9. 50 grams of al and 9. 50 grams of o2?
The reactant [tex]O_{2}[/tex] is limiting if we begin with 9. 50 grams of al and 9. 50 grams of [tex]O_{2}[/tex] .
The reactant whose number of moles is present in less quantity is called limiting reactant .
Calculation,
Given mass of Aluminium and oxygen
Mass of Aluminium = 9. 50 grams
and Mass of oxygen = 9. 50 grams
Number of moles of aluminium = given mass / molar mass of aluminium
Number of moles of aluminium = 9. 50 grams/ 26.99 = 0.351 mole
Number of moles of oxygen = given mass / molar mass of oxygen
Number of moles of oxygen = 9. 50 grams/ 31.999 = 0.296 mole
The reactant [tex]O_{2}[/tex] is limiting because oxygen present in less quantity or in limiting quantity and consume rapidly.
Therefor , the reactant [tex]O_{2}[/tex] is limiting if we begin with 9. 50 grams of al and 9. 50 grams of [tex]O_{2}[/tex] .
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As water freezes, ________. its hydrogen bonds break apartit loses its polarityit cools the surrounding environmentits molecules move farther apart.
The molecules of water move farther apart upon freezing.
Molecules are the compounds formed by the combination of one or more atoms by certain chemical bonds. Each molecule has distinctive physical and chemical properties.
Water is also a molecule consisting of two H atoms and one O atom. Its physical state in nature is liquid. The atoms present inside water are joined together by the hydrogen bonding. Upon freezing, water molecules start forming more hydrogen bonds with the molecules present in their neighborhood. This makes them to move farther and spread apart. This also marks the reason for ice being denser than water.
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Consider the reaction in the lead-acid cell pb(s) pbo2(s) 2 h2so4(aq) 2 pbso4(aq) 2 h2o(l) for which e°cell = 2. 04 v at 298 k. δg° for this reaction is:________
δg° for the reaction having e° cell = 2.04v. is 393.658kJ.
The lead (Pb) in the lead storage battery act as an anode
What is Voltaic Cell?A voltaic cell or galvanic cell is an electrochemical cell that uses chemical reactions to produce electrical energy.
Parts of voltaic cellAnode where oxidation occurs Cathode where reduction occurs.
Therefore, Pb acts as anode and PbO2 act as a cathode.
Given,
E° cell = 2.04v
Faraday constant= 96485 C/mol
Moles of electron transferred n= 2
∆G = -nFE°
= -2 × 96485 × 2.04
= 393.658kJ
Thus we concluded that the δg° for the reaction having e° cell = 2.04v. is 393.658kJ.
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How many electrons are present in the nonbonding π molecular orbital of the allyl anion? a. 2 b. 1 c. 3 d. 0
The number of electrons, which are present in the nonbonding π molecular orbital of the allyl anion is "0".
Anions, cations, but also allylic radicals have always been frequently mentioned as reaction intermediates. Each one has three adjacent [tex]sp^{2}[/tex]-hybridized carbon centers, and they all rely on resonance for stability. Two resonance structures would be used to present each species, with the charge as well as unpaired electron scattered across both the 1,3 and 0 positions.
The Aufbau principle states that these orbitals would fill up based on the order of stability, therefore a typical pi bond, will have 2 electrons in the Pi orbital as well as zero in the Pi* orbital.
Therefore, the correct answer will be option (d)
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Determine the name for aqueous H2CO3. carbonous acid dihydrogen carbonate carbonic acid hydrocarbonic acid hydrocarbide acid
The name for aqueous [tex]H_{2} CO_{3}[/tex] is carbonic acid.
So, option C is correct one.
Binary hydrogen compounds with non metals may form H+ (proton) and an anion dissolved in water. The acidic solutions are named as if they were molecular acids , using the usual name for the compound itself , replacing hydrogen with hydro- and suffix -ide with ic. The word acid is then use.
The inorganic acid is an acid drive from one or more inorganic compounds. All inorganic acids form hydrogen ions and the conjugate base ions when dissolved in water.
Example: carbonic acid ( [tex]H_{2} CO_{3}[/tex] )
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The O2 molecule breaks apart at lower wavelengths than the O3 molecule. What is the main reason for this?
The main reason for this is Average bond of O₂ is shorter and strong from O₃.
What is ozone?Ozone is a blue gas composed of three oxygen atoms bonded together.
It occurs naturally high up in the Earth's atmosphere, where it protects the surface from harmful ultraviolet (UV) rays,
UV radiation will dissociate ozone into an oxygen atom and an oxygen molecule.
Ozone molecules are tetrahedral so the bond angle is 109 degree the electrons in the double bond occupy more space that the non-bonding electron pair.
Oxygen has a small size that leads to smaller O-O bond length.
A lone pair of electrons on both the oxygen repel each other leading to weakening of O-O bond.
O3 has longer and weaker bonds than O2, whereas SO2 has shorter and stronger bonds than SO.
Molecular oxygen, O2, is photolyzed by light of 241 nm and has a bond energy of 498 kJ/mol.
The main reason for this is Average bond of O₂ is shorter and strong from O₃.
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If the percent yield for the following reaction is 65.0%, how many grams of KClO3 are needed to produce 8.00 g of O2?
Taking into account definition of percent yield, 31.42 grams of KClO₃ are needed to produce 8.00 g of O₂.
Reaction stoichiometryIn first place, the balanced reaction is:
2 KClO₃ → 2 KCl + 3 O₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
KClO₃: 2 moles KCl: 2 molesO₂: 3 molesThe molar mass of the compounds is:
KClO₃: 122.55 g/moleKCl: 74.55 g/moleO₂: 32 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
KClO₃: 2 moles× 122.55 g/mole= 245.1 gramsKCl: 2 moles× 74.55 g/mole= 149.1 gramsO₂: 3 moles× 32 g/mole= 96 gramsPercent yieldThe percent yield is the ratio of the actual return to the theoretical return expressed as a percentage.
The percent yield is calculated as the experimental yield divided by the theoretical yield multiplied by 100%:
percent yield= (actual yield÷ theorical yield)×100
where the theoretical yield is the amount of product acquired through the complete conversion of all reagents in the final product, that is, it is the maximum amount of product that could be formed from the given amounts of reagents.
Percent yield for the reaction in this caseIn this case, you know:
actual yield= 8 gramstheorical yield= ?percent yield= 65%Replacing in the definition of percent yields:
65= (8 grams÷ theorical yield)×100
Solving:
theorical yield= (8 grams÷ 65)×100
theorical yield= 12.31 grams
Then, this means that you need to find the mass of KClO₃ would theoretically produce 12.31 g of O₂.
Mass of KClO₃ requiredThe following rule of three can be applied: If by reaction stoichiometry 96 grams of O₂ are produced by 245.1 grams of KClO₃, 12.31 grams of O₂ are produced by how much mass of KClO₃?
[tex]mass of KClO_{3} =\frac{12.31 grams of O_{2}x245.1 gramsof KClO_{3} }{96 grams of O_{2}}[/tex]
mass of KClO₃= 31.43 grams
Finally, 31.42 grams of KClO₃ are needed to produce 8.00 g of O₂.
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Which is an aspect of the kinetic-molecular theory and can be used to explain the compressibility of plasma
The answer choice which represents an aspect of the kinetic-molecular theory and can be used to explain compressibility of plasma is; Particles move independently of one another and are widely spaced.
What is the kinetic-molecular theory?The kinetic-molecular theory in discuss postulates about the states of matter.
Also, it is built upon the idea that matter is composed of tiny particles that are constantly in motion.
Hence, the theory is explanatory of the observable properties and behaviours of solids, liquids and gases and hence, explains the compressibility of plasma.
Remarks;
Particles move independently of one another and are widely spaced. Particle kinetic energy increases with increasing temperature. Particles exert no attractive or repulsive force on one another. Particles always move even when they have fixed positions.Read more on kinetic molecular theory;
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How does the enthalpy of photosynthesis compare to the
enthalpy of cellular respiration?
The results of photosynthesis are used by cellular respiration, and photosynthesis first uses the results of cellular respiration.
Enthalpy of photosynthesis and cellular respiration:In the mitochondria, cellular respiration combines oxygen and glucose to produce ATP, along with water and carbon dioxide. Sunlight energy is used during photosynthesis to create glucose and separate oxygen from carbon dioxide and water. Globally, the exchange of carbon dioxide and oxygen during photosynthesis or cellular respiration serves to maintain stable levels of oxygen and carbon dioxide in the atmosphere.
Cellular Respiration: [tex]C_6H_1_2O_6+ 6O_2[/tex] → [tex]6CO_2 + 6H_2O[/tex]
Because CO₂ and H₂O are less energetic than the reactants, most notably glucose, the reaction is exothermic and has a negative enthalpy (ΔH < 0). This also makes sense because breathing causes glucose to be converted to energy.
Photosynthesis: [tex]6CO_2 + 6H_2O[/tex]→ [tex]C_6H_1_2O_6+ 6O_2[/tex]
The enthalpy change for the photosynthesis reaction is +2814 kJ/mol.
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Draw the alkane formed when 4,5,5‑trimethyl‑1‑hexyne or 4,5,5‑trimethylhex‑1‑yne is treated with two equivalents of hbr.
Answer:
2,2 - dibromo - 4,5,5 - trimethylhexane
Explanation:
When 2 equivalents of HBr are added to 4,5,5‑trimethyl‑1‑hexyne, the alkane (at the top right of the image) is formed. The bromine branches are added to the second carbon because the intermediate carbocations are the most stable on the secondary carbon. Below I have drawn the mechanism.
Write the empirical formula for at least four ionic compounds that could be formed from the following ions:
Answer:
Fe(CN)₂, FeCO₃, Pb(CN)₄, Pb(CO₃)₂
Explanation:
Cations (positively charged ions) can only form ionic bonds with anions (negatively charged ions). However, you can't just simply put one cation and one anion together to form a compound. Each compound needs to been neutral, or have an overall charge of 0. When cations and anions do not have charges that perfectly cancel, you need to modify the amount of each ion in the compound.
1.) Fe(CN)₂
-----> Fe²⁺ and CN⁻
-----> +2 + (-1) + (-1) = 0
2.) FeCO₃
-----> Fe²⁺ and CO₃²⁻
-----> +2 + (-2) = 0
3.) Pb(CN)₄
-----> Pb⁴⁺ and CN⁻
-----> +4 + (-1) + (-1) + (-1) + (-1) = 0
4.) Pb(CO₃)₂
-----> Pb⁴⁺ and CO₃²⁻
-----> +4 +(-2) + (-2) = 0
A gas mixture contains ar and h2. what is the total pressure of the mixture, if the mole fraction of h2 is 0. 350 atm and the pressure of h2 is 0. 480 atm?
Considering the Dalton's partial pressure, the total pressure in the mixture of gases is 1.371 atm.
The pressure exerted by a particular gas in a mixture is known as its partial pressure.
So, Dalton's law states that the total pressure of a gas mixture is equal to the sum of the pressures that each gas would exert if it were alone:
[tex]P_{T}[/tex] = [tex]P_{1}+P_{2}+......+P_{n}[/tex]
where n is the amount of gases in the mixture.
Dalton's partial pressure law can also be expressed in terms of the mole fraction of the gas in the mixture. So in a mixture of two or more gases, the partial pressure of gas A can be expressed as:
[tex]P_{A}[/tex] = [tex]X_{a}P_{T}[/tex]
In this case, the partial pressure of gas H₂ can be expressed as:
[tex]P_{H2}[/tex] = [tex]X_{H2} P_{T}[/tex]
You know:
[tex]P_{H2}[/tex] = 0.48 atm
[tex]X_{H2}[/tex] = 0.35
Replacing in the definition of partial pressure of gas H₂:
[tex]0.48atm = 0.35P_{T}[/tex]
Solving:
[tex]P_{T}[/tex] = [tex]\frac{0.48atm}{0.35}[/tex]
[tex]P_{T}[/tex]= 1.371 atm
In summary, the total pressure in the mixture of gases is 1.371 atm.
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Which type of molecule are lipids mostly made of non-polar polar protein or water?
The lipids are mostly made up of non-polar molecule type .
So , first option is correct one.
Lipids contains same elements as the carbohydrates like carbon , hydrogen , and oxygen ( C , H and O) . However lipids are mainly made up of hydrocarbon chain ( or rings ) and contain few polar hydroxyl groups ( -OH ) . This makes the most lipids non - polar hydrobhobic molecules and hey are not dissolve well in water. The lipids are mainly made up of glycerol and fatty acids .
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The normal boiling point of fingernail polish remover is 56℃. what is the vapor pressure of fingernail polish remover at the salon, which is kept at a temperature of 22℃ for the comfort of customers?
The normal boiling point of fingernail polish remover is 56℃ the vapor pressure of fingernail polish remover at the salon 0.027 atmospheric pressure
What is atmospheric pressure?The pressure exerted by the vapors due to the atmosphere as it is surrounded by it only is known as vapor pressure and its unit is atm.
As air have small molecules which forms multiple layers and create pressure.
vapor pressure = {1/T1 - 1/T2}
T1 = 56 c
T2 = 22 c
substituting the values,
vapor pressure = [ 1/ 56 - 1 / 22 ]
= 0.027 atm.
Therefore, the vapor pressure of nail paint remover is 0.027 atm
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What is the process that involves the breaking of intermolecular forces that hold an enzyme into the ordered three dimensional shape?
The process that involves the breaking of intermolecular forces that hold an enzyme is known as denaturation.
What are enzymes?
A substance produced by a living organism which acts as a catalyst to bring about a specific biochemical reaction.Almost all enzymes are proteins. There are some nucleic acids that behave like enzymes. These are called ribozymes. An enzyme like any protein has a primary structure, i.e., amino acid sequence of the protein. An enzyme like any protein has the secondary and the tertiary structure. A tertiary structure that contains the backbone of the protein chain folds upon itself, the chain criss-crosses itself and hence, many crevices or pockets are made. One such pocket is the ‘active site’. An active site of an enzyme is a crevice or pocket into which the substrate fits. Thus enzymes, through their active site, catalyse reactions at a high rate.To learn more about enzymes: https://brainly.com/question/1996362
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How many half-lives have passed in a sample that originally contained 5000 parent isotopes but now has only 625?
Answer:
3 half lives
Explanation:
5000 * (1/2)^n = 625 where n = number of half lives
log ( 625/5000) / log(1/2) = n = 3
5000 2500 1250 625
This cement should string up and break approximately 1 inch from the slab. Group of answer choices Zinc Phosphate Zinc Oxide Intermediate restorative material Glass Ionomer
The given description details the methods that are used in Mixing Zinc Phosphate for Permanent Cementation,
The complete description contains the following details:
Personal protective equipment (PPE) is required for the healthcare team, and the student is required to identify and prepare the instrument setup.
Equipment and Supplies
• Glass slab (cool)• Spatula (flexible stainless steel)• Zinc phosphate powder and dispenser• Zinc phosphate liquid and dropper• 2 × 2-inch gauze padsWhat is Cementation?This refers to the use of cement to create a building structure that is used to keep things in place.
Hence, we can see that the Procedural Steps include:
Preparing the Mix
1. Dispense the powder toward one end of the slab and the liquid toward the opposite end.
2. Recap the containers.PURPOSE These materials can be affected by prolonged exposure to the humidity.
3. Divide the powder into small increments as directed by the manufacturer.
4. Incorporate each powder increment into the liquid.NOTE When increment sizes vary, smaller increments are used first. Mixing time per increment also varies; the time is approximately 15 to 20 seconds.
5. Spatulate the mix thoroughly, using broad strokes or a figure-8 movement over a large area of the slab.PURPOSE This aids in dissipating the heat generated during mixing.
6. Test material for appropriate cementation consistency. The cement should string up and break about 1 inch from the slab. Total mixing time is approximately 1 to 2 minutes
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A solution has a poh of 7. 1 at 10∘c. what is the ph of the solution given that kw=2. 93×10−15 at this temperature? remember to report your answer with the correct number of significant figures
A solution has a pOH of 7. 1 at 10∘c. Then the pH of the solution given that kw=2. 93×10−15 at this temperature is 7.4 .
It is given that,
pOH of solution = 7.1
Kw =2.93×10^(-15)
Firstly, we will calculate the value of pKw
The expression which we used to calculate the pKw is,
pKw=-log [Kw]
Now by putting the value of Kw in this expression,
pKw =−log{2.93×10^(-15)}
pKw =15log(2.93)
pKw=14.5
Now we have to calculate the pH of the solution.
As we know that,
pH+pOH=pKw
Now put all the given values in this formula,
pH+7.1=14.5
pH=7.4
Therefore, we find the value of pH of the solution is, 7.4.
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1. There are 42 grams of sugar (C12H22O11) in a can of pop (342mL). Use this information (where necessary) to answer the following questions:
a) How many moles of sugar are there in the pop (3 marks)?
b) If a mole of sugar costs 90 cents, what is the value of the sugar in a can of pop (3 marks)?
c) How many particles of sugar are there in the pop (3 marks)?
d) What is the concentration (mol/L) of the sugar in the pop (3 marks)?
1. The mole of sugar in the pop is 0.123 mole
2. The value of the sugar in the pop is 11.07 cents
3. The number of particles of the sugar in the pop is 0.74×10²³ particles
4. The concentration of the sugar in the pop is 0.36 mol/L
1. How to determine the mole of the sugarMass of sugar (C₁₂H₂₂O₁₁) = 42 gMolar mass of sugar (C₁₂H₂₂O₁₁) = 342 g/molMole of sugar (C₁₂H₂₂O₁₁) =?Mole = mass / molar mass
Mole of sugar (C₁₂H₂₂O₁₁) = 42 / 342
Mole of sugar (C₁₂H₂₂O₁₁) = 0.123 mole
2. How to determine the value of the sugarCost per mole = 90 centsCost of 0.123 mole of sugar =?1 mole of sugar = 90 cents
Therefore,
0.123 mole of sugar = 0.123 × 90
0.123 mole of sugar = 11.07 cents
3. How to determine the number of particles of the sugarFrom Avogadro's hypothesis,
1 mole of sugar = 6.02×10²³ particles
Therefore,
0.123 mole of sugar = 0.123 × 6.02×10²³
0.123 mole of sugar = 0.74×10²³ particles
4. How to determine the concentration of the sugarMole of sugar (C₁₂H₂₂O₁₁) = 0.123 moleVolume = 342 mL = 342 / 1000 = 0.342 L Concentration of sugar =?Concentration = mole / Volume
Concentration of sugar = 0.123 / 0.342
Concentration of sugar = 0.36 mol/L
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