The composition of the mixture is 2.5 moles of HI, 0.75-mole I₂, and 0.75 moles of H₂.
The act of combining elements or elements to shape an entire. the ensuing nation or product. manner of being composed; structure: This portrait has an orderly composition. make-up; constitution: His ethical composition becomes impeccable.
A composition can discuss with any innovative painting, be it a quick story, poem, essay, studies paper or a piece of tune. consequently, the principle difference between essay and composition is that essay is a form of composition whereas composition refers to any innovative paintings.
H₂ + I₂ = 2HI
initial 2mol 2 0mol
final 2.5 mol
limiting reagent is I₂
2 mole of HI is produced by 1 mole of I₂
2.5 mole of I₂ is produced by = 1/2 × 2.5
= 1.25 mole
The final composition of the mixture = 2.5 moles of HI, 0.75-mole I₂, and 0.75 moles of H₂.
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you know that the boiling point of a given liquid is dependent on several different variables. what would happen to the boiling point of a liquid if the volume of the liquid was halved?
Because boiling point is independent of liquid volume, the boiling point would not vary.
What is boiling point ?
A liquid's boiling point changes depending on the pressure being applied; the normal boiling point is the temperature at which the vapor pressure is equal to the average atmospheric pressure at sea level (760 mm [29.92 inches] of mercury). Water boils at sea level at 100° C.
The temperature at which a liquid's vapor pressure equals the pressure around it and the liquid turns into a vapor is known as the boiling point of a substance
A liquid's boiling point varies depending on the atmospheric pressure in the area. The boiling point of a liquid is lower in a partial vacuum than it is at atmospheric pressure. A liquid's boiling point is lower under low pressure than it is under air pressure. As a result, water boils at 99.97 °C (211.95 °F) at sea level but at 93.4 °C (200.1 °F) at 1,905 m (6,250 ft) altitude under standard pressure. Various liquids will boil at different temperatures at a given pressure.
Because boiling point is independent of liquid volume, the boiling point would not vary.
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element x has two naturally occurring isotopes. if 72% of the atoms have a mass of 85 amu and 28% of the atoms have a mass of 87 amu, what is the atomic mass of element x?
The atomic mass of element x is 85.56 amu if 72% of the atoms have a mass of 85 amu and 28% of the atoms have a mass of 87 amu
The atomic mass of an element can be determined by first multiplying the percentage of its isotopes by their atomic mass and then adding the resultants together.
As 72% of the atoms have a mass of 85 amu and 28% have a mass of 87 amu, therefore
atomic mass of element x = (72% × 85) + (28% × 87)
atomic mass of element x = (72/100 × 85) + (28/100 × 87)
atomic mass of element x = (0.72 × 85) + (0.28 × 87)
atomic mass of element x = 61.2 + 24.36
atomic mass of element x = 85.56 amu
Therefore the atomic mass of element x is calculated to be 85.56 amu.
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The hydrochloric acid utilized in this experiment can often discolor gloves if it is spilled on them during use. If this does occur, what should be done in order to remedy this potentially hazardous situation?.
In order to remedy this potentially hazardous situation of Hydrochloric acid option b. put some sodium bicarbonate on the gloves so they can be neutralized.
Hydrochloric acid, additionally known as muriatic acid, is an aqueous answer of hydrogen chloride. it's far a drab answer with a distinctively smelly odor. it's far categorized as a robust acid. It is a part of gastric acid in the digestive structures of maximum animal species, which include human beings.
Hydrochloric acid (HCl) is generally used for the neutralization of alkaline marketers, as a bleaching agent, in the food, textile, metallic, and rubber industries. it's far neutralized if launched into the soil and it rapidly hydrolyzes while exposed to water.
Hydrochloric acid is a clean, toxic liquid. it is a caustic chemical and notably corrosive, which means it right away reasons severe damage to tissues, such as burning, on touch. this text discusses poisoning from swallowing or breathing in hydrochloric acid.
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Disclaimer:- your question is incomplete, please see below for the complete question.
The hydrochloric acid utilized in this experiment can often discolor gloves if it is spilled on them during use. If this does occur, what should be done in order to remedy this potentially hazardous situation?
a. Gloves are not needed in this experiment, this question is invalid.
b. put some sodium bicarbonate on the gloves so they can be neutralized.
c. Remove the glove and wash your hand prior to putting a new pair on.
d. wash the gloves off and continue to use them.
Beryllium, the first element in group 2, has an atomic number of 4. The second element in this group has an atomic number of?.
Answer:
I think 11 yeah.. try that
Explanation:
Electrons from fadh2 are transferred to succinate reductase and then to a small organic molecule called?.
Electrons from fadh2 are transferred to succinate reductase and then to a small organic molecule called Ubiquinone.
Electron Transport chain?
The electron transport chain main job is to produce an electrochemical gradient. It propels the production of ATP during photosynthesis and cellular respiration in mitochondria and chloroplasts, respectively. Cellular respiration uses it.
Ubiquinone transfer electrons to Complex III from Complexes I and II as well as from other mitochondrial dehydrogenases by acting as an electron transporter in the mitochondrial respiratory chain.
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why does bread grow mold more quickly at room temperature than in the refrigerator? why does bread grow mold more quickly at room temperature than in the refrigerator? the formation of mold is an endothermic process, and low temperatures favor endothermic processes. because of the absence of sunlight, the potential energy of the reactants is lower in the refrigerator. more reactants will have the energy necessary to proceed to products at room temperature than at refrigerator temperatures. the formation of mold is an example of a photochemical process, and it cannot occur in a dark place such as a refrigerator.
Bread grows mold more quickly at room temperature than in the refrigerator because more reactants will have the energy necessary to proceed to products at room temperature than at refrigerator temperatures.
Molds are formed on bread due to various reactions that facilitate the living of the molds on the bread and allow them to reproduce on the bread.
However, as molds are living organisms characterized as fungi, they need enzymes for function.
The enzymes and proteins normally function best at room temperature. On the other hand, when the temperatures are low, such as that of a refrigerator the molds will not have enough energy because the proteins and enzymes will be inactivated. Hence, molds grow on bread quickly at room temperature as compared to bread in a refrigerator.
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Consider a 3-atom molecule a-b-a for which b has a total of only two valence electrons. If you assume that b is a group ii metal, what is the bond angle for a-b-a? please answer in degrees to the nearest whole number.
Consider a 3-atom molecule a-b-a for which b has a total of only two valence electrons if you assume that b is a group ii metal, then the bond angle for a-b-a is 180 degree
Valence electron is the s and p electron in the outermost shell and electron present in the inner shell are core electron and according to the valence shell electron pair repulsion theory and we that bond angle that an atom has with its neighbor which also called dihedral angle a group II metal has two valence electron there it can form only single bond then b will not have any lone pair and the ones digit in the group number is the number of valence electron and 180 degree bond angle means the atom are connected in straight line called 180 degree bond
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A scientist placed a sample of lithium into a container of water. The scientist observed the lithium floating and making a buzzing sound as gas bubbles were forming around it. Smoke and steam were released as well. Which conclusion is BEST supported by this observation?
A.
Water was vaporized.
B.
Dissolved gases were released.
C.
A chemical change took place.
D.
The lithium was dissolved by the water.
Answer:
Explanation:Again, this is an example of a physical change. Figure 3.6. 1: Ice melting is a physical change. When liquid water (H2O) freezes into a solid state (ice), it appears changed; however, this change is only physical, as the composition of the constituent molecules is the same: 11.19% hydrogen and 88.81% oxygen by mass.03-Sept-2019
XY + Z→ XZ + Y is an example of a
XY + Z→ XZ + Y is an example of a substitution reaction. A substitution reaction involves the exchange of one atom for another.
Why is a substitution reaction?A substitution reaction involves the exchange of one atom for another. These are extremely useful reactions in the chemical industry because they allow chemists to transform one compound into something more useful, allowing them to construct designer molecules such as drugs.Substitution reactions are classified into two types: nucleophilic reactions and electrophilic reactions. The primary distinction between these two reactions is the type of atom that is attached to the original molecule.The combination of two or more atoms or molecules to form a large molecule is known as an addition reaction. A substitution reaction is one in which an atom or group of atoms is replaced by another atom or group of atoms.To learn more about substitution reaction, refer to:
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79.853 ml of 4.988 m sodium fluoride (aq) is added to 23.760 ml of 1.471 m beryllium sulfate. after the reaction is complete, what is the mass of precipitate that has formed?
Using the balanced reaction equation, we can calculate that the mass of the precipitate will be 1.617 g.
To solve this question, we need to write the balanced reaction equation first:
2 NaF(aq) + BeSO₄(aq) → Na₂SO₄(aq) + BeF₂(s)
We can now see that the precipitate will be beryllium fluoride. We can also see that 1 mol of beryllium sulfate reacts with 2 moles of sodium fluoride. Now we can calculate the number of moles (n) of both reactants using their molarities (c) and volumes (V):
c = n/V ⇒ n = c * V
n(NaF) = c(NaF) * V(NaF)
n(NaF) = 4.988 M * 79.854 mL = 0.3983 mol
n(BeSO₄) = c(BeSO₄) * V(BeSO₄)
n(BeSO₄) = 1.471 M * 23.3760 mL
n(BeSO₄) = 0.03439 mol
We can see that n(NaF) is more than 2 times greater than n(BeSO₄), so NaF is in excess, and BeSO₄ is the limiting reactant. Now we can calculate the number of moles of BeF₂ formed:
1 mol BeSO₄ : 1 mol BeF₂ = 0.03439 mol BeSO₄ : X
X = 0.03439 mol BeF₂
We can now convert the number of moles (n = 0.03439 mol) of BeF₂ into mass (m), using the molar mass of BeF₂ (M = 47.01 g/mol):
n = m/M ⇒ m = n * M
m = 0.03439 mol * 47.01 g/mol
m = 1.617 g
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When a hydrogen atom is covalently bonded to either oxygen, , or fluorine there will be an attraction between that hydrogen and a lone pair of on a nitrogen, oxygen, or fluorine atom on an adjacent molecule. This attraction is called a bond.
When a hydrogen atom is covalently bonded to either oxygen, , or fluorine there will be an attraction between that hydrogen and a lone pair of on a nitrogen, oxygen, or fluorine atom on an adjacent molecule. This attraction is called a bond nitrogen lone bond.
Lone pairs do they produce hydrogen bonds?Strong intermolecular interactions known as hydrogen bonds can develop between adjacent molecules. Between the covalently bound hydrogen atom of one molecule and the electron lone pair of a second molecule, hydrogen bonds are created.
Due to their strong electronegativity, only nitrogen, oxygen, or fluorine atoms may be used in this process. These three atoms have extremely high electronegativity, which makes it simple for them to draw the electron from the hydrogen atom and establish hydrogen bonds.
Atoms within a molecule are held together by intramolecular forces. There are forces between molecules known as intermolecular forces.
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Al + Pb(NO3)2 -------------------------------> ? fasttttttttttttttttt
4Al + 2Pb(No3)2 → 4Al(No3) + Pb2
Hope this helps!
the reaction of tert-butyl bromide, (ch3)3cbr, with ethanol affords the substitution product tert-butyl ethyl ether, (ch3)3coch2ch3, in acidic conditions. what would happen to the rate of the reaction if the concentration of ethanol was doubled?
The rate of the reaction if the concentration of ethanol was doubled will remain the same.
The rate of the reaction tert-butyl ethyl ether, (ch3)3coch2ch3, in acidic conditions, will undergo the SN1 mechanism so the rate of reaction will remain the same.
The rate of reaction is the rate at which a chemical reaction takes region, defined as proportional to the increase inside the concentration of a product in step with unit time and to the lower within the awareness of a reactant in line with unit time. response prices can vary dramatically.
The speed with which a reaction takes area is called the fee of a response. as instance, timber combustion has a high response rate since the manner is fast, and rusting of iron has a low response rate as the technique is slow. Rate is most customarily calculated by the usage of the equation The devices of rate calculated in this manner are s -1.
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Can I find a tutor help me wit this question?
Chemistry =>Introduction to Chemistry => Scientific Method
A scientific method corresponds to a methodology to obtain new knowledge.
We must start from an idea, an assumption of how a compound or a process behaves, this is our hypothesis.
Following this, we must identify what can affect our process, what are the variables, and what will be the response variable, for this we carry out an experiment.
Once the experiments have been carried out, we must analyze the results, draw conclusions as to why the behavior occurs, and if our hypothesis is true or not.
It is useless for us to obtain new knowledge if we do not share it, We have to share the results, in this way other people can start from that knowledge to create another,
Therefore, the answer will be:
1. Make a hypothesis
2. Conduct an experiment
3. Analyze the experiment data
4. Communicate the results
you cool a liquid mixture of acetic acid and water that has a mole fraction of water of 0.9. as you begin to freeze the acetic acid/water mixture, what happens to the mole fraction of water in the liquid phase?
The mole fraction of water decreases because, at this starting mole fraction, solid water forms before solid acetic acid.
What is mole fraction ?
Mole fraction represents the number of molecules of a particular component in a mixture divided by the total number of moles in the given mixture. It’s a way of expressing the concentration of a solution.
The amount fraction is another name for the mole fraction. It is the same as number fraction, which is calculated by dividing the number of molecules in a constituent (Ni) by the sum of all molecules. Instead of using a Roman x, the lowercase Greek letter chi is occasionally used to represent the mole fraction. The IUPAC recommends the letter y for gas mixtures.
Because it does not include the name of the unit mole, the National Institute of Standards and Technology of the United States prefers the phrase amount-of-substance fraction to mole fraction.
Molar concentration is a proportion of moles to volume, whereas mole fraction is a ratio of moles to moles.
The mole fraction of water decreases because, at this starting mole fraction, solid water forms before solid acetic acid.
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Cobalt metal and copper ions
a. The metal known as cobalt forms cobalt III oxide and cobalt II oxide when it react with oxygen.
b. The ionic charge on the metallic copper is +2
How cobalt III oxide is formedWhen cobalt II oxide reacts with oxygen, it results in the formation of cobalt III oxide.
The balanced chemical equation is given below.
4CoO + O₂ → 2Co2O₃
The ion on metallic is plus 2 charge, it is on this premise that the ionic charge on the metallic copper is confirmed as +2.
So therefore, when cobalt is combines with air, it forms a binary compound known as cobalt II oxide and tricobalt tetroxide.
O₂
Complete question:
a. What compounds does cobalt metal forms?
b. What is the charge on copper ion?
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water molecules slide around each other, making and breaking hydrogen bonds. as energy is added, the molecules move so rapidly that they fly off in all directions. this phase-change process is
Water molecules slide around each other, results in making and breaking of hydrogen bonds. As energy is added, molecules move rapidly that they spread in all directions. This phase-change process is called vaporization.
The temperature of liquid water increases as it is heated up until it reaches 100°C. Water that was in liquid state turns into vapors at this point. This transition of a liquid into a gas is referred to as Vaporization. The water molecules absorb heat energy. As a result, the particles move more quickly as they gain extra energy until they possess sufficient energy to break free of the liquid molecules to vapors. There are two types of vaporization. 1. Boiling that occurs below the surface of a liquid. The boiling point of a liquid is the temperature at which it begins to boil. Water has a boiling point of 100 °C. 2. Evaporation that take place at the surface of the liquid. Some of the molecules that move faster are able to overcome the forces of attraction of other molecules and escape from the water's surface.
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Specify the particular process(es) that would be altered, and EXPLAIN how this/these process(es) would be altered. (Hydrologic Cycle)
The hydrologic cycle to be altered because of global warming due to increasing green house effect.
What is global warming?Global warming is the term used to describe the phenomena of a gradual increase in temperature close to the earth's surface. This trend has been noticed during the past century or so. This change has affected the pattern of the earth's climate. Scientists have offered proof that the earth's temperature is gradually rising, even if the concept of global warming is still up for debate.
Global warming has a number of causes that are harmful to people, plants, and animals.
What is Green house effect?A glass-enclosed structure called a greenhouse is used to grow plants. The sun's beams warm the greenhouse's air and plants. The greenhouse must be warmed in order for the plants to flourish because the heat that is trapped inside is unable to escape. The earth's atmosphere is identical.
The greenhouse gases in the earth's atmosphere absorb the heat throughout this process. Because of this, the earth's surface becomes warmer, which enables life to exist on the planet.
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helium condenses to a liquid at 4.224 k under atmo- spheric pressure and remains a liquid down to the abso- lute zero of temperature. (it is used as a coolant to reach very low temperatures.) the vapor pressure of liquid helium at 2.20 k is 0.05256 atm. calculate the volume occupied by 1.000 mol helium vapor under these condi- tions and compare it with the volume of the same amount of helium at standard temperature and pressure.
If we assume that helium acts as an ideal gas, we can calculate that 1.000 mol of it will take up 3.43 L, which is 6.53 times less than its volume at standard conditions.
Assuming that helium behaves like an ideal gas in both cases, we can calculate the volume at 2.20 K using the ideal gas equation:
PV = nRT
P - the pressure exerted by the gas (0.05256 atm)
V - the volume of the gas
n - number of moles of the gas (1.000 mol)
R - universal gas constant (0.08206 L*atm/K*mol)
T - temperature (2.20 K)
If we rearrange the equation, we get:
V = nRT/P
Now we plug in the known values:
V = 1.000 mol * 0.08206 L*atm/K*mol * 2.20 K / 0.05256 atm
V = 3.43 L
At standard conditions (273 K, 1 atm), 1 mol of an ideal gas has a volume of 22.4 L, so the volume at described conditions is 22.4 L / 3.43 L = 6.53 times smaller than at standard conditions.
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Which animal will a photographer take a picture of in North American grassland
O a gazelle
O a lion
O a buffalo
O an ostrich
Answer:
a buffalo
Explanation: if its north America it needs to be native from here none of the other are from north America
Which weather pattern consists of a low-pressure system of rising warm, moist weather that leads to cloudy and rainy weather?
Cyclone movement
Convection currents
The Coriolis effect
Anticyclone winds
pls help soon
Answer:
Cyclone Movement
Explanation:
To form a cyclone, warm, moist air over the ocean rises upward from near the surface. As this air moves up and away from the ocean surface, it leaves is less air near the surface.
So basically as the warm air rises, it causes an area of lower air pressure below.
a sample of 4.50g of methane occupies 12.7dm3 at 310k. (i) calculate the work done when the gas expands isothermally against a constant external pressure of 200torr until its volume has increased by 3.3dm3 . (ii) calculate the work that would be done if the same expansion occurred reversibly
(a) The work done when the gas expands isothermally against a constant external pressure is 87.992 kJ
(b) The work that would be done if the same expansion occurred reversibly is 167.4 J
Given that the mass of methane m is = 4.5 gram = 0.0045 kg
Volume occupies [tex]V_{1}[/tex] = [tex]12.7dm^{3}[/tex]
And volume is increased by [tex]3.3dm^{3}[/tex]
So, the increased volume [tex]V_{2}[/tex] is
12.7 + 3.3 = 16 litres
Given temperature T is 310K
Pressure is given as 210 Torr = 26664.5 Pa
(a) Now, at the given pressure the work done is given by
W = P( [tex]V_{2}[/tex] - [tex]V_{1}[/tex])
W = 26664.5 (16 - 12.7)
W = 87992.85 J
W = 87.992 kJ
(b) At reversible process work done is given by
W = nRT㏑[tex]\frac{V2}{V1}[/tex]
We have the given mass = 4.5 gram
Molar mass of methane = 16
So number of moles is
n = Mass in gram / Molar Mass
n = 4.5 / 16
n = 0.28125
So, work done is
W = 0.28125 × 8.314 × nRT㏑[tex]\frac{16}{12.7}[/tex]
W = 167.4 J
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Please read the following direction I need it ASAP!!!
HIghschool Earth & Physical Science (9th Grade)
The correct answer about Liquids A and B is:
Liquid B has a lower boiling point because more water evaporated, therefore the interactions between the particles in Liquid B are weaker than the interactions in Liquid A; option D
What is the boiling point of a liquid?The boiling point of a liquid is the temperature at which the molecules of the liquid change phase from liquid to gas.
At the boiling point of a liquid, the molecules of the liquid acquire enough energy to break free of the intermolecular forces between the molecules.
The lower the boiling point of a liquid, the lesser the strength of the intermolecular forces between the molecules,
Hence liquids with lower boiling points evaporate faster.
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In which step of the four-stroke engine cycle does the car release CO₂, H₂O, and CO?
O A. Combustion and expansion
O B. Compression and ignition
O C. Exhaust
O D. Air and fuel intake
Answer:
Explanation:
In which step of the four-stroke engine cycle does the car release CO₂, H₂O, and CO?
O C. Exhaust
A volcano has recently irrupt it and wiped out most of the wildlife will leave it on the volcano how are birds in the area going to be impacted
A volcano has recently irrupt it and wiped out most of the wildlife will leave it on the volcano and it will create huge impact on birds in the area going to be impacted as the volcano irrupt heat will generate and it will cause increase in the temperature that will change the life style of the various birds living in that area.
What is volcano?Volcano is defined as a rupture in the part of the crust of the planetary mass of the object generally Earth, which allows the hot lava as well as ash, including the gases that has been escaped from the chamber of the magma.
Therefore, A volcano has recently irrupt it and wiped out most of the wildlife will leave it on the volcano and it will create huge impact on birds in the area going to be impacted as the volcano irrupt heat will generate and it will cause increase in the temperature that will change the life style of the various birds living in that area.
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Name the two molecular compounds you think would have the same mass.
The oxides of 'C' and 'N' are the two molecular compounds having the same mass i.e. CO₂ and N₂O.
To calculate the molecular weight of a molecule, individual atomic masses of various elements are added.
Given: The atomic mass of 'C' = 12u
The atomic mass of 'N' = 14u
The atomic mass of 'O' = 16u
∵Molecular weight of CO₂ = 12+16+16 = 44g/mol
The molecular weight of Carbon Dioxide is 44g/mol.
∵Molecular weight of N₂O = 14+14+16 = 44g/mol
The molecular weight of Nitrous Oxide is 44g/mol.
Molecular compounds having the same mass are known as Isobars. Isobaric properties are:
Same physical behaviorDifferent chemical behaviore.g.: Ar and Ca
suppose you performed a titration of a weak acid and you found that the equivalence point occurred at 14.81 ml of added naoh. at what volume would you use the ph to determine the pka of the acid? enter your answer numerically to three significant figures.
The volume at which the pH can be used to determine the pKa of the acid is 7.40 ml if the equivalence point occurred at 14.81 ml of added sodium hydroxide.
The weak acid and the conjugate base will have an equal number of moles at the half-equivalence point as the number of moles of sodium hydroxide will neutralize half of the number of moles of the weak acid which will then produce more conjugate base.
The chemical reaction can be given as;
HA = (H^+) + A^-
Calculation of pKa:
pH = pKa + log[A^-]/[HA]
At half equivalence point, pH = pKa
As, ka = 10^-pka
Therefore, ka = 10^-pH
Volume is given which is 14.81 ml. Therefore, the volume that is used to determine the pKa of the acid can be calculated as follows;
14.81/2 = 7.40 ml
Therefore the volume used to determine the pKa of the acid is calculated to be 7.40 ml
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Which of the following compounds has the general formula X3Y2?
Mg2N3 compound having general formula X2Y2 it having cation as +3 charge and bonds ionically with group 15 in a 2:3 ratio.
What is compound?When two or more elements combine chemically in a specific mass ratio, the resulting product is called a compound. Compounds can be defined as substances consisting of two or more different types of elements in a fixed ratio of their atoms.
A compound is one where different types of atoms have joined together to form molecules. For example, water is a compound. The chemical name of water is H2O because it contains two hydrogen atoms and one oxygen atom chemically bonded together.
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A large bar of solid gold is melted into liquid. the liquid is then poured into molds to make a number of gold coins. was this chemical or physical? explain.
Answer:
physical change
Explanation:
melting is a physical change, a physical change does not involve a change in chemical bonds.
[cu2 ] concentration in a copper-silver electrochemical cell is 0.1m at 25 oc. if the total cell potential is 0.422v, what is the [ag ] concentration?