Answer: B
Explanation:
According to Charle's law, at constant pressure the volume of a fixed mass of a ga is directly proportional to its absolute temperature.
At constant pressure, V∝T.
HELP ASAP CHEM!!!! Please
Answer:
The solubility of gases decreases with pressure as that of solids and liquids is not affected.
A sample of the amino acid tyrosine is barely soluble in water. Would a polypeptide containing only Tyr residues, poly(Tyr), be more or less soluble, assuming the total number of Tyr residues is the same in both cases? Explain.
Answer:
Explanation:
The first thing we need to know is that the amino acid of tyrosine has an aromatic ring within its structure.
Also, recall that aromatics hydrocarbons are considered to be unsaturated and non-polar.
So, since like dissolve like. Then, The non-polar character of tyrosine is enhanced by its aromatic ring. As a result, Tyrosine amino acid is much more soluble in less polar solvents like methanol and ethanol than in moderate highly polar water.
From the given information:
Since water is a very polar solvent, and tyrosine amino acid is not particularly polar, it is just barely soluble in it.
In addition to the aforementioned, peptides are strongly polar in nature. However, as the amount of tyrosine amino acids in a peptide increases, the region of the non-polar portion of the peptide increases (owing to the rise of the aromatic ring), and thus the non-polar value of the peptide will also rise. And this non-polar nature of peptide will make them more soluble in non-polar solvent and decrease its solubility in water (because water is polar in nature). And since peptides are non-polar, they would be more soluble in non-polar solvents and have less solubility in water.
What information does a molecular formula give?
O A. The actual number of atoms in a molecule
OB. The percent composition of atoms in a molecule
O C. The lowest ratio of atoms in a molecule
O D. The order in which atoms are bonded in a molecule
Answer:
A. The actual number of atoms in a molecule
Explanation:
Molecular formula is simply defined as a type of chemical formula that describes the type and number of atoms present in a single molecule of a compound.
Looking at the options, the correct answer is option A.
Answer:
a
Explanation:
What story does Ms. McDermid share about maggots helping identify a dead man?
Answer:
The maggots had traces of this man in them and the entomologists found out who he was just by using the DNA in the maggots.
Explanation:
Answer:
She shares how there were maggots found in an empty house and found cocaine on them. By this, they knew that the maggots had been feeding off human remains. They were then able to run more tests and find DNA that were on these maggots and they were able to discover who the victim was.
Somebody please answer
A sample of gas at 500 mm Hg inside a steel tank is cooled from 773 K to 273 K. What is the final pressure of the gas in the steel tank?
Answer:
177 mmHg
Explanation:
Given that:
The sample of a gas is with Pressure (1) [tex]P_1[/tex] = 500 mmHg
The initial temperature [tex]T_1[/tex] = 773 K
The final temperature [tex]T_2[/tex] = 273 K
Using ideal gas equation:
[tex]\dfrac{P_1}{T_1} = \dfrac{P_2}{T_2} \\ \\ \dfrac{500}{773} = \dfrac{P_2}{273} \\ \\ (136500) = 773 \times P_2 \\ \\ P_2 = \dfrac{136500}{773} \\ \\ P_2 = 176.58 \ mmHg \\ \\ \simeq 177 mmHg[/tex]
what is the vowel.????????????
Answer:
a e i o u
Explanation:
a e i o u
A sample of NH3 contains 10.0 grams of nitrogen and 25.00 grams of oxygen. Find its percent composition.
N= 0=
Answer:
[tex]\%N=28.6\%\\\\\%O=71.4\%[/tex]
Explanation:
Hello there!
In this case, according to the given information, it is possible to calculate the percent compositions, by dividing the mass of each element by the sum of the masses of the elements as shown below:
[tex]\%N=\frac{m_N}{m_N+m_O} *100\%\\\\\%O=\frac{m_O}{m_N+m_O}*100\%[/tex]
Thus, we plug in the given masses to obtain:
[tex]\%N=\frac{10.0g}{10.0g+25.00g} *100\%=28.6\%\\\\\%O=\frac{25.00g}{10.0g+25.00g}*100\% =71.4\%[/tex]
Regards!
Calculate the ph of a buffer solution that contains 0.25 M benzoic acid (c6h5co2h) and 0.15M sodium benzoate (c6h5coona) . Ka=6.5×10-5
Answer:
4.0
Explanation:
we have a buffer system formed by a weak acid (benzoic acid C₆H₅O₂H) and its conjugate base (benzoate ion C₆H₅O₂⁻, coming from sodium benzoate C₆H₅O₂Na). Given the acid dissociation constant (Ka) for benzoic acid is 6.5 × 10⁻⁵, we can calculate the pH of the buffer solution using the Henderson-Hasselbach equation.
pH =pKa + log [base]/[acid]
pH =-log Ka + log [C₆H₅O₂⁻]/[C₆H₅O₂H]
pH =-log 6.5 × 10⁻⁵ + log (0.15 M/0.25 M) = 4.0
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answer this
whoever answer this correct i will mark the brainliest
Answer:
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90 POINTS
Question
What is the best description of how an electric motor works?
Question 4 options:
Metal electrodes in a solution generate positive and negative ions to turn chemical energy into electrical energy.
One magnet is pushed towards another magnet, causing it to move.
A current runs through a loop of wire in a magnet field; the force from the magnet causes the wire to rotate.
A magnet moves through a stationary coil of wire, causing an electric current to flow through it.
Answer:
A current runs through a loop of wire in a magnet field; the force from the magnet causes the wire to rotate
Explanation:
https://www.jameco.com/Jameco/workshop/ProductNews/motor-buyers-guide.html#:~:text=Electric%20motors%20work%20by%20converting,or%20direct%20(DC)%20current.&text=Electric%20Motors%20have%20an%20array%20of%20applications.
its hard to explain simply because i dont have a mastery over the subject yet myself, but this article should help explain it
if you have any questions, leave them in the comments and i will try to answer them, if this helped, pls give brainliest
Which element has the largest nuclear charge?
Cs
Li
Mg
S
Answer:
Mg
Explanation:
I think Mg is correct not too sure tho
Determine the electron-group arrangement, molecular shape, and ideal bond angle(s) for each of the following:
(a) SO3
(b) N2O (N is central)
(c) CH2C12
Solution :
a). [tex]$SO_3$[/tex]
This compound is known as sulfur trioxide.
The molecular shape of sulfur trioxide is trigonal planer.
And the bond angle is 120°.
b). [tex]$N_2O$[/tex]
This compound is known as Nitrous oxide. Here, nitrogen is in the center. There is no lone pair around the nitrogen atom and it forms two sigma bonds with the other two atoms.
It is linear in shape.
The bond angle between them is 180°.
c). [tex]$CH_2Cl_{2}$[/tex]
This compound is known as the Dichloromethane.
The molecular shape of the compound is tetrahedral.
The bond angles is 120°
QUESTION 57 Select the diamagnetic ion.
A. Ni2+ B. Cu2+ C. Sr2+ D. Cr3+
Answer:
c
Explanation:
how to find molecular weight
Answer:
Using the periodic table of the elements to find atomic weights, we find that hydrogen has an atomic weight of 1, and oxygen's is 16. In order to calculate the molecular weight of one water molecule, we add the contributions from each atom; that is, 2(1) + 1(16) = 18 grams/mole.
Explanation:
hope this helped
How many grams of sodium chloride are in 100 mL of 1.25 M sodium chloride?
Answer:
7.3125grams
Explanation:
Molarity is the measure of the molar concentration of a solution. It can be calculated using the formula as follows:
Molarity = number of moles (n) ÷ volume (V)
Based on the information given,
Molarity = 1.25 M
Volume = 100 mL = 100/1000 = 0.1 L
Molarity = n/V
1.25 = n/0.1
n = 1.25 × 0.1
n = 0.125mol
Using the below formula to calculate the mass of NaCl;
mole = mass/molar mass
Molar mass of NaCl = 23 + 35.5 = 58.5g/mol
0.125 = mass/58.5
mass = 0.125 × 58.5
mass = 7.3125 grams
Which element has the most energy levels?
Cs
Li
Mg
S
Answer:
I think Cs
Explanation:
because it has 6 energy levels
Please help! Will give brainiest for best answer! Please Explain how you got there as well. Thanks.
1. a) Write the word equation for the reaction of barium nitride with potassium.
2. b) Write the balanced formula equation for this reaction.
3. c) If 21.0 g of potassium reacts with 62.5 g of barium nitride, what mass of potassium nitride will
be produced?
4. d) Identify which reactant is the limiting reactant and which is the excess reactant.
5. e) How many grams of the excess reactant reacts and how many grams are left over?
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it's in order and the answer is also there, just read it thanks ☜(^o^☜()
Which of the following correctly describes the location of subatomic particles within an atom?
ОА.
Electrons are located outside of the atom's nucleus.
B. Protons are located inside neutrons.
OC. Neutrons are located inside of electrons.
OD. The nucleus of the atom surrounds the electrons.
Answer:
electrons are located outside of the atoms nucleus
What sort of fossils have been found in Antarctica from about the time of Pangaea (250 MYA)?
Answer:
Lystrosaurus
Explanation:
Lystrosaurus, a vegetarian dinosaur whose name apparently means "trowel dinosaur," inhabited the area in the earliest Triassic period, 220 million years. It is believed to be have been herbivorous which developed to be around one meter long, with an average build similar to a pig. Lystrosaurus skeletons have only been discovered in Antarctic peninsula, India, and Africa.
Find the percent composition for SF6
S =? %
F =? %
Answer:
S = 21.92 %
F = 78.08 %
Explanation:
To find the percent composition of each element in SF6, we must find the molar mass of SF6 first.
Molar mass of SF6 = 32 + 19(6)
= 32 + 114
= 146g/mol
mass of Sulphur (S) in SF6 = 32g
mass of Fluorine (F) in SF6 = 114g
Percent composition = mass of element/molar mass of compound × 100
- % composition of S = 32/146 × 100 = 21.92%.
- % composition of F = 114/146 × 100 = 78.08%.
What is the specific heat of the Orange Juice? How do I find it out?
Use the equation qliquid = m × c × ΔT to calculate the heat gained by the cold liquid. Use the specific heat for the liquid (Orange Juice) you selected.
Answer:
3.89
Explanation:
the specific heat is usually quoted at constant pressure but in some applications where pressure changes it is quoted at quoted at constant volume
A gas container has a volume of 446.9 with a temp of 14c. When the volume is decreased to 238.7l the new temp is what
Answer:
[tex] \frac{V _{1}}{T _{1}} = \frac{V _{2}}{T _{2} } \\ \frac{446.9}{(14 + 273)} = \frac{238.7}{T _{2} } \\ {T _{2}} = \frac{238.7 \times 287}{446.9} \\ {T _{2}} = 153.3 \: kelvin \\ = 119.7 \degree \: c[/tex]
Bella observes that the gas-filled tire of her bicycle becomes a little deflated when
she keeps the bicycle outside in cold weather. Which of the following laws is used to
understand the behavior of the gas and why? (5 points)
The low temperature outside lowers the volume of the gas according to
1)
Charles's law because this law describes how a gas will behave at constant
pressure.
2)
The low temperature outside increases the volume of the gas according to
Charles's law because this law describes how a gas will behave at constant
pressure.
3)
The low temperature outside lowers the volume of the gas according to
Boyle's law because this law describes how a gas will behave when the
number of moles remains constant.
The low temperature outside increases the volume of the gas according to
4)
Boyle's law because this law describes how a gas will behave when the
number of moles remains constant.
Answer:
Answer is A - The low temperature outside lowers the volume of the gas according to Charles's law because this law describes how a gas will behave at constant pressure.
Explanation:
The low temperature outside lowers the volume of the gas according to Charles's law because this law describes how a gas will behave at constant pressure.
What is Charles law?Charles states that, the volume of aa given mass of gas is directly proportional to its temperature at constant pressure.
Hence, to understand this behavior of the gas, we must understand that the low temperature outside lowers the volume of the gas according to Charles's law because this law describes how a gas will behave at constant pressure.
Learn more about Charles's law:https://brainly.com/question/16927784
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A(n) __________ occurs when the moon enters the umbral shadow of the earth without being entirely immersed in it.
partial lunar eclipse
total lunar eclipse
annular eclipse
Answer:
Partial lunar eclipse.
Explanation:
A lunar eclipse is a cosmological event by which, in the presence of the Earth between the Sun and the Moon, the latter does not receive the light of the Sun in the totality of its visible face, with which a part (or the totality ) of her is in the dark.
Thus, if the lunar eclipse implies an absence of sunlight in the entire lunar surface, the eclipse will be total, while if the eclipse implies an absence of light only in part, the eclipse will be partial (which is the most common event).
Determine the resulting pH when 75 mL of 0.05M HBr is reacted with 74 mL of 0.075 M KOH
Answer:
pH = 12.08
Explanation:
H⁺ + OH⁻ → H₂OFirst we calculate how many moles of each substance were added, using the given volume and concentration:
HBr ⇒ 0.05 M * 75 mL = 3.75 mmol HBrKOH ⇒ 0.075 M * 74 mL = 5.55 mmol KOHAs HBr is a strong acid, it dissociates completely into H⁺ and Br⁻ species. Conversely, KOH dissociates completely into OH⁻ and K⁺ species.
As there are more OH⁻ moles than H⁺ moles (5.55 vs 3.75), we calculate how many OH⁻ moles remain after the reaction:
5.55 - 3.75 = 1.8 mmoles OH⁻With that number of moles and the volume of the mixture, we calculate [OH⁻]:
[OH⁻] = 1.8 mmol / (75 mL + 74 mL) = 0.0121 MWith [OH⁻], we calculate the pOH:
pOH = -log[OH⁻] = 1.92With the pOH, we calculate the pH:
pH = 14 - pOHpH = 12.08Potassium chloride (KCl), sodium sulfate (Na2SO4), glucose (C6H12O6), and sodium phosphate (Na3PO4) are soluble in water. Rank the solution from the lowest impact on phase change temperatures to highest based on colligartve properties if they all have the same molarity concentration.
a. KCl
b. Na2SO4
c. C6H12O6
d. CO2
e. (NH4)3PO4
Answer:
(NH4)3PO4 > Na2SO4 > KCl > C6H12O6 > CO2
Explanation:
Colligative properties are those properties that depend on the amount of solute present in the system.
Usually, the more the number of particles in the system, the greater the impact of colligative properties on phase change temperatures if all the solutions have the same molarity concentration.
Hence, the order of impact on phase change temperatures is as follows; (NH4)3PO4 > Na2SO4 > KCl > C6H12O6 > CO2
Most of the elements in group 1 are classified as
Answer:
alkali metals
Explanation:
:)
1. What is the composition
of Ca(No2)2
Answer:
1 Calcium, 2 Nitrogen, and 4 oxygen
Explanation:
there is no number before of after Ca(calcium), so there is only 1. No(nitrogen) has no number next to it so there would be only 1 of it,but there is a 2 after the parenthesis so there is 2 nitrogen (2*1=2). O(oxygen) has a two next to it so there would be only 2 oxygen, but there is a two after the parenthesis so instead there are 4 oxygen because 2*2=4. Hope this helped you <3
8.5 g of rubidium are reacted completely with water.
The reaction makes a solution of rubidium hydroxide.
The volume of this solution is 2.5 dm'.
Calculate the concentration of the rubidium hydroxide solution in g dm
(relative atomic mass: Rb = 85; relative formula mass: RbOH = 102)
please how do i work this out
Answer:
3.4g/dm³
Explanation:
Mass concentration = mass of solute/volume of solution
According to this question;
Mass of rubidium = 8.5g
Volume of rubidium hydroxide solution = 2.5dm³
Mass conc. = 8.5/2.5
Mass conc. 3.4g/dm³.
what is the photo above showing