Answer:
it it B
Explanation:
He has to be sure to bring enough material (bricks, concrete, steel etc.) so that when the building is finished, it turns out LONG enough to reach all the way from the roof down to the ground.
If there is any gap left, it would be very difficult for the people who work in the offices to get up into the building. Then it could be a complete waste,
The relationship which best describes weathering and erosion is that
Weathering breaks down rock while erosion carries it to a new location.
Weathering involves the breaking down of rock particles into smaller units
which later forms the soil components.
Erosion involves washing away or movement of the uppermost layer of the
soil to a new location/place and an example is the movement of soil
particles when water from rainfall or wind is present.
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The student puts a teaspoon (10 g) of C12H22O11 sugar in a cup of tea. How many sugar molecules does a student drink along with this tea?
Answer:
1.76 x 10²²molecucles
Explanation:
Given parameters:
Mass of the sugar C₁₂H₂₂O₁₁ = 10g
Unknown:
Number of molecules = ?
Solution:
The number of molecules can be determined if we find the number of moles first.
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of C₁₂H₂₂O₁₁ = 12(12) + 22(1) + 11(16) = 342g/mol
Number of moles = [tex]\frac{10}{342}[/tex] = 0.029mole
1 mole of C₁₂H₂₂O₁₁ will contain 6.02 x 10²³
0.029 mole of C₁₂H₂₂O₁₁ will be made up of 0.029 x 6.02 x 10²³
= 1.76 x 10²²molecucles
determine the vapor pressure in atm of water in an aqueous solution of 12% BY MASS EHTYLEENE GLYCOL (ANITFREEZE) IF THE VAPOR PRESSURE OF
The given question is incomplete, the complete question is:
Determine the vapor pressure (in atm) of water in an aqueous solution of 12% by mass ethylene glycol (antifreeze) if the vapor pressure of pure water at that temperature is 0.095 atmospheres.
Answer:
The correct answer is 0.091 atm.
Explanation:
Based on the given information, the mass of ethylene glycol is 12% by mass, which means 12 grams of ethylene glycol dissolved in 88 grams of water.
The moles of a substance can be determined by using the formula,
Moles = Weight/molecular mass
Number of moles of water = mass/molecular mass
= 88g/18g/mol
= 4.88 moles
Number of moles of ethylene glycol = Mass/molecular mass
= 12 grams/62g/mol
= 0.193 moles
Mole fraction of water will be,
Mole fraction = number of moles of water/Number of moles of water+Number of moles of ethylene glycol
Mole fraction = 4.88/4.88+0.193
= 0.961
Vapor pressure of water can be determined by using the formula,
Vapor pressure = Vapor pressure of pure water * Mole fraction of water
= 0.095 * 0.961
= 0.091 atm.
HELP HELP
There is only one type of receptor to sense stimuli
true or false?
they deserve a brainliest :)
Propane tanks that are used on BBQ grills contains large amount of propane gas. Which explanation supports why gas can be easily compressed.
a. Gas has a definite volume
b. Gas particles are far apart so they are easy to compress together.
c. Gas particles takes the shape of the container so it can easily compress together.
Answer:
b. Gas particles are far apart so they are easy to compress together.
Explanation:
Please help I'm so confused
Methylphenidate is used to treat ADHD (attention deficit hyperactivity disorder). A patient is prescribed two 10.1 mg Methylphenidate tablets each day. Methylphenidate patches release Methylphenidate into the body by absorption through the skin. The patches come with different amounts of Methylphenidate. The maximum amount of Methylphenidate in one brand of patch supplies a patient with 20. mg of Methylphenidate per day.
Determine the amount of Methylphenidate a patient may take using 2 tablets (in mg) Be sure your answer has the correct number of significant figures.
Answer:
They work by increasing activity in the brain, particularly in areas that help control attention and behaviour. Methylphenidate is used to treat children with attention deficit hyperactivity disorder (ADHD). It helps with hyperactivity and impulsive behaviour, and allows them to concentrate better.
Explanation:
The __________ is the part of the solution that is in the greater quantity, and the __________ is the smaller portion of the solution.
A. solvent/solute
B. solute/solvent
C. mixture/compound
D. compound/mixture
Answer:
the answer should be A ! hope this helps :)
Explanation:
classify the following as a heterogeneous, homogeneous, or a pure substance:
Lemonade with no pulp
Answer:
pretty sure it's heterogeneous
Explanation:
Also, I saw you added me as a friend and I'm kinda curious as to why :)
Answer:
Heterogeneous mixture
Explanation:
See Picture for Question. I have other questions as well.
Answer: here lol
Explanation:
hope it helps just read very carefully
What organic product would you expect from the reaction of ethylmagnesium bromide (CH3CH2MgBr) with H2O.
Answer:
It would produce ethane (CH₃CH₃)
Explanation:
Ethylmagnesium bromide (CH₃CH₂MgBr) is a Grignard's reagent.
It is a highly reactive substance, and as any alkylmagnesium bromide
(R-CH₂MgBr) it reacts with water to produce an alkane (R-CH₃). R stands for any carbon structure bonded to that functional group.
The part of memory which temporarily holds information for later use is refered to as
A. clipboard. B. Clipart. C. Desktop. D. Flash disk
Answer:
D - Flash Disk
Explanation:
Using the activity series, the reaction 2Al+6HBr-2 AlBr3+3 H2 will only occur if.....Al is above Be on the periodic table or heat is added to the reaction or a precipitate forms or Al is above H on the activity series
Answer:
Al is above H on the activity series
Explanation:
The given chemical reaction is expressed as:
2Al + 6HBr → 2AlBr₃ + 3H₂
The reaction above is a single displacement or replacement reaction and will only occur if Al is above H on the activity series.
The driving mechanism of such reaction is the position of the species on the activity series. The higher an atom is the more reactive and easier it will displace the lower ones.Determine the mole ratio between oxygen and water for the following equation:
2 H2 + O2 - 2 H2O
A. 1:2
B. 1:1
C. 2:2
D. 2:1
Answer:2.2
Explanation:
Which of the following is an effect we can already observe on Earth that results for global warming?
stronger hurricanes
more severe wildfires
less sea ice in the Arctic in summertime
all of the above
Answer:
All of the above
Explanation:
When glucose is reduced the product is
Select one:
a. maltose
b. glucitol
O c. galactose
O d. gluconic acid
e. sucrose
Answer:
b) Glucitol
Explanation:
The glucose loses the carbonyl group and its transformed to CH2OH
why is chemistry chemistry?
The concentration in ppm = 125,000 ppm
Further explanationThe concentration of a substance can be expressed in several quantities such as moles, percent (%) weight / volume,), molarity, molality, parts per million (ppm) or mole fraction. The concentration shows the amount of solute in a unit of the amount of solvent.
ppm or parts per million (ppm) :
For water solvent = 1 ppm ⇒ 1 mg/L(1 kg=1 L,ρ water=1 kg/L)
In percent mass = 1 ppm ⇒ 1 mg/ 1 kg
Solution contains 0.25 kg of lead in 2 kg of water :
Solvent = water = 2 kg = 2 L
Solute= lead=0.25 kg=250000 mg
So the concentration in ppm :
[tex]\tt ppm=\dfrac{250,000~mg}{2~L}=\boxed{\bold{125,000~ppm}}[/tex]
Answer:
The concentration in ppm = 125,000 ppm
Explanation:
that is why chemistry is chemistry.
How many moles of helium gas are contained in a presurized gas cylinder with an internal volume of 10.0 L at a pressure of 8.91 atm and a temperature of 287.4 K?
Answer:
n = 3.77 mol
Explanation:
Given data:
Number of moles = ?
Volume of gas = 10.0 L
Pressure = 8.91 atm
Temperature = 287.4 K
Solution:
Formula:
PV = nRT
R = general gas constant = 0.0821 atm.L/ mol.K
by putting values,
8.91 atm × 10.0 L = n × 0.0821 atm.L/ mol.K ×287.4 K
89.1 atm.L = n × 23.60 atm.L/ mol
n =89.1 atm.L / 23.60 atm.L/ mol
n = 3.77 mol
Which ions have ten electrons in the outermost subshell?
Explanation:
There are ten d electrons in the outermost d subshell for Zn2+.
Compare the relative strength of the two forces B and C. Explain how you determined this comparison by identifying the forces.
The intermolecular forces or the strength of C is more than that of B.
What are intermolecular forces?
Intermolecular forces are the forces that hold the molecules of any object in a particular state of matter.It exists between molecules.These forces are weak when compared with intramolecular forces.Hydrogen bonding, dipole-dipole, Vander Walls, and ion-dipole are the types of intermolecular forces.At a short distance, these forces are repulsive but at large distances they are attractive.Here, we can see that C has dipole-dipole interaction while B has none.
Therefore, it states that the intermolecular forces present in C are much more than that in B.
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Which is the product of these numbers, to the appropriate number of significant digits?
91.40 x 2.00 =
Answer:
180
Explanation:
just multiply and round to whole number
What would you expect the balance to read when the reaction has finished? Circle the correct answer.
179 g , 180 g , 181 g
Answer all of the questions pllllzzz
Answer:
180 g
Explanation:
At the end of the reaction, the mass is still expected to be 180g this is because in every chemical reaction, mass must be conserved.
According to the law of conservation of mass "in a chemical reaction, matter is neither created nor destroyed".
Bonds are broken and elements rearranged. The mass is thereby constantThe sum of the mass of the reactant is then even equal to the mass of the product derived.Lithium chloride crystallizes in a face-centered cubic unit cell with chloride ions occupying the lattice points and lithium ions occupying octahedral holes. How many chloride ions surround each lithium ion in LiCl?
Answer:
6
Explanation:
The coordination number of a particular crystal structure arrangement is defined as the number of nearest neighbor atoms or ions surrounding an atom or ion.
We must note that in salts of the type MX, the coordination number of each ion must be equal. The structure of LiCl is built by placing each unit cell next to another such that ions residing in the corner, edge or face sites are shared between adjacent unit cells. The LiCl is in FCC arrangement.
Hence in LiCl, each Li+ ion is surrounded by 6 chloride ions.
What type of reaction mechanism accounts for the reaction of an alkene with aqueous acid to give an alcohol
Answer: Electrophilic addition reaction
Explanation:
Alkenes are compounds which have at least one double bond between the carbon atoms in the molecule. This is an indication of a shortage of hydrogen atoms. The compound is said to be unsaturated. As an unsaturated compound alkene undergoes the following reaction:
-- Combustion reaction
-- Hydrogenation reaction
-- Addition reaction.
The addition reaction of alkenes occur due to the presence of pi electrons in which an electrophile attacks the carbon-carbon double bond to form the addition products. An electrophile is a molecule that has the affinity to react with other molecules containing a donatable pair of electrons.
A typical example of reaction between alkene and acid is in the decolourisation of acidified potassium tetraoxomanganate(VII) with ethene. The oxygen supplied to the reaction breaks the double bond to yield ethane 1,2 diol ( an alcohol).
The reaction of an alkene with the acid has been performed with the carbocation intermediate formation, followed by the nucleophilic substitution reaction.
The alkenes have been the hydrocarbons with the presence of one double bond in the structure. The double bond has been consisted of the pi electrons.
The alkene has been bonded with the pi-electron, thus in the chemical reaction the pi bond-breaking results in the partial negative and positive charge to the carbon atoms. The negative OH group has been the nucleophile that is attracted by the negatively charged carbon atom, and the bond formation results in the alcohol.
The reaction for an alkene with acid has been given in the image attached.
Thus, the reaction of an alkene with the acid has been performed with the carbocation intermediate formation, followed by the nucleophilic substitution reaction.
For more information about the reaction mechanism, refer to the link:
https://brainly.com/question/24924720
Which statement describes an interaction between the biosphere and the hydrosphere
The answer is 1) Plant roots take in water through their roots.
Explanation:The biosphere is made up of all the lifeforms present on the Earth. The hydrosphere is constituted of all the water bodies and sources of water.
When a certain lifeforms from the biosphere reaches out to another sphere, preferably to fetch what if requires to survive, it is said that there is an interaction between two spheres of the larger environment.
These spheres are all interdependent on each other. (i did this before)
Answer:
Plant roots take in water through their roots.
Explanation:
EDGE 2021
I don't understand
Answer:
A 9 moles of reactants changes into 11 moles of product
Explanation:
Which of these elements has the highest first ionization energy?
a) As
b) Ga
c) Bi
d) Cs
e) K
Answer:
Cesium (Cs)
Explanation:
This eliment has an ionization energy of 3,8939
enantiomeric pair and its application
Explanation:
Enantiomers are pairs of non-identical molecules that are non-superimposable mirror images of each other and that have at least one chiral carbon or chiral center, making them chiral compounds. They have similar chemical properties, except for when they interact with other chiral compounds.
What is the significance of temperature t
Answer:
send a pic or more info
Explanation:
Treatment of 2-amino-2-methylcyclohexanone with methyl 2,4-dibromobutanoate in the presence of a nonnucleophilic base, , involves two successive SN2 reactions and gives compound A. Propose a structural formula for compound A.
Answer:
Explanation:
The proposed structural formula for compound A can be seen in the diagram below with its reaction mechanism. In the first SN2 reaction, we could see how anime reacts with the primary alkyl bromide since it is more reactive. However, the product derived undergoes a subsequent SN2 reaction in the second stage to produce a cyclic product.
Please help me out with these chemistry questions before 11:59pm
Answer:
The bond in a homonuclear diatomic molecule is non-polar due to the electronegativity difference of zero
Explanation:
Which of the following pairs of elements will not form an ionic bond with
each other.
Sodium and Argon
Calcium and Oxygen
Magnesium and Chlorine
Aluminum and Nitrogen
Answer:
Sodium and Argon
Explanation: