Please Answer the Question
Answer:
Explanation:
I think it is D
What are 2 reasons molecules cannot pass easily through the cell membrane? What part of the cell membrane helps them get through?
Answer:
The cell membrane's main trait is its selective permeability, which means that it allows some substances to cross it easily, but not others. Small molecules that are nonpolar (have no charge) can cross the membrane easily through diffusion, but ions (charged molecules) and larger molecules typically cannot. A concentration gradient is a just a region of space over which the concentration of a substance changes, and substances will naturally move down their gradients, from an area of higher to an area of lower concentration.
In cells, some molecules can move down their concentration gradients by crossing the lipid portion of the membrane directly, while others must pass through membrane proteins in a process called facilitated diffusion.
Explanation:
there are your two reasons molecules cannot pass easily through the cell membrane and what part of the cell membrane helps them get through is concentration gradient
Stoichiometry is the branch of chemistry that deals with elements in
compounds and with reactants and products in chemical reactions,
focusing on.
a. bonding
b. energy transfers
c. mass relationships
d. physical characteristics
A log has a density of .8 g/cm³. What will happen to this log in freshwater, which has a density of 1.0 g/cm³?
It will sink.
It will float.
It will move deeper.
It will decrease in density.
Answer:
The log will float on the water because its density is lower than the liquid, so it will stay at the top due to Archimedes' principle.
Answer:
B: It will float.
Explanation:
on edge2021! hope this helps!!~ (=^▽^=)
Calculate the second volumes. 980 L at 71 C and 107.2 atm to 13 C and 59.3 atm
The second volume : V₂= 1472.9 L
Further explanation
Given
980 L at 71 C and 107.2 atm
13 C and 59.3 atm
Required
The second volume
Solution
T₁ = 71 + 273 = 344 K
P₁ = 107.2 atm
V₁ = 980 L
P₂ = 59.3 atm
T₂ = 13 + 273 = 286 K
Use combine gas law :
P₁V₁/T₁ = P₂V₂/T₂
Input the value :
107.2 x 980/344 = 59.3 x V₂/286
V₂= 1472.9 L
Which one of the following substances will have hydrogen bonding as one of its intermolecular forces?
a
о
Нc— c— СТ.
Oь
o=
H— С—Н
нан
H— C— N
н н
н
0
1
— С—С
1
н н
Answer:
Explanation:
hc-- c--ct
The correct answer is option A: CH3COCH3
Hydrogen bonding occurs when hydrogen is directly bonded to a highly electronegative atom.
Hydrogen bonding is one of the intermolecular interactions. It occurs only when hydrogen is bonded to a very electronegative atom in a molecule. Hydrogen bonding can occur between two molecules of the same type(intermolecular hydrogen bonding) or within the same molecule (intra molecular hydrogen bonding). In either case, the bonding is polar as hydrogen is attached to the electronegative atom via a non-covalent bonding interaction.
Looking at the structures in the question attached, CH3COCH3 does not have any hydrogen atom directly attached to a highly electronegative atom hence CH3COCH3 does not exhibit hydrogen bonding.
Hydrogen bonding in water is shown in the image attached.
For more about hydrogen bonds, see
https://brainly.com/question/10904296
A storm is moving toward your house at a speed of 20km/h. It is now
60km away from your house. In what time will the storm reach your
house? Remember to put the correct units too. *
Answer:
it will reach the house in 3 hours
Explanation:
20km x 3h = 60km
2. The smaller numbers in the image below
represent
-2H
2
a) I don't know, and don't want to try
b) Coefficients
c) Subscripts
d) none of the answers are correct
Explanation:
The smaller numbers in the image below represents the subscripts.
Peer-reviewed papers are considered trustworthy because they
A.Have more than one author incorrect answer
B.Prove their hypotheses incorrect answer
C.Have been checked by other scientists
D.are published frequently
How does the bond formed determine the physical and chemical characteristics of the compounds and molecules formed?
I'm pretty sure we have the same class (I go to FL), because I have the same problem, and it was assigned the day you posted this, so I can't give a full answer but important things would be conducting electricity, solubility, flexibility, shape, and geometries. Sorry I can't be of more help!
The melting points for the compounds Li2S, Rb2S, and K2S are 900, 500, and 840 degrees C, respectively. Give the three compounds in order of increasing lattice energy
Answer: [tex]Rb_2S[/tex] < [tex]K_2S[/tex] < [tex]Li_2S[/tex]
Explanation:
Lattice energy is the energy required to dissociate 1 mole of the an ionic compound into its constituent ions.
Thus higher is the lattice energy more energy will be required to melt the compounds.
As [tex]Li_2S[/tex] has highest melting point, it will require most energy to melt an hence it will have highest lattice energy. The order of three compounds in order of increasing lattice energy
[tex]Rb_2S[/tex] < [tex]K_2S[/tex] < [tex]Li_2S[/tex]
A compound contains 64.3% carbon, 7.14% Hydrogen, and 28.6% Oxygen. What is the empirical formula for this substance?
Оа
C₂H₂O
Oь
C9H₂O2
Ос
C₂H₂O
Od
CHO
Answer:
Empirical formula is C₃H₄O
Explanation:
Empirical formula:
It is the simplest formula gives the ratio of atoms of different elements in small whole number .
Given data:
Percentage of hydrogen = 7.14%
Percentage of carbon = 64.3%
Percentage of oxygen = 28.6%
Empirical formula = ?
Solution:
Number of gram atoms of H = 7.14 / 1.01 = 7.1
Number of gram atoms of O = 28.6 / 16 = 1.8
Number of gram atoms of C = 64.3 / 12 = 5.4
Atomic ratio:
C : H : O
5.4/1.8 : 7.1/1.8 : 1.8/1.8
3 : 4 : 1
C : H : O = 3 : 4 : 1
Empirical formula is C₃H₄O.
How many moles of bromine gas are produced
when fluorine reacts with 347.5 g of potassium
bromide?
Answer:
1.46 mol
Explanation:
Given data:
Moles of bromine gas produced = ?
Mass of potassium bromide = 347.5 g
Solution:
Chemical equation:
2KBr + F₂ → 2KF + Br₂
Number of moles of KBr:
Number of moles = mass/ molar mass
Number of moles = 347.5 g/ 119.0 g/mol
Number of moles = 2.92 mol
Now we will compare the moles of KBr and bromine.
KBr : Br₂
2 : 1
2.92 : 1/2×2.92 = 1.46 mol
Why is the movement of water between land, oceans and living things
important?
If an element has three isotopes with known natural abundance percentages,
what other information is needed to find the average atomic mass of the
element?
A. The average mass of the isotopes
B. The atomic number of each isotope
C. The mass of each isotope
D. The sum of the masses of the isotopes
What kind of reaction is represented by Fe + CuSO4 → Cu + FeSO4?
A. A double-replacement reaction
B. A decomposition reaction
O C. A single-replacement reaction
OD. A synthesis reaction
SUBMIT
Answer:
The answer is C. A single replacement reaction.
Explanation:
I did quiz.
The reaction is represented by Fe + CuSO4 → Cu + FeSO4 is single-replacement reaction . option C is correct.
What is single replacement reaction?
A single-replacement reaction sometimes is called single displacement reaction into which a single compound as gets attached to the other compound after the completion of the reaction and we get it as a product.
Examples are Zn + 2HCL will give ZnCl + H2 gas but the condition is that the elements which are replacing must be of same in nature otherwise they will not get replace by any of them.
Therefore, reaction is represented by Fe + CuSO4 → Cu + FeSO4 is single-replacement reaction . option C is correct.
Learn more about single replacement reaction, here:
https://brainly.com/question/8625202
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Describe the function of the PNS and
the CNS.
Answer: PNS, CNS is
Periferal nervous system. Central nervous system.
Explanation:
Acidified solutions of sodium dichromate, K 2 Cr 2 O 7 , and copper (I) bromide, CuBr, are mixed.
Answer:
[tex]Cr_2O_7^{2-}(aq)+2Cu^+(aq)\rightarrow Cu_2Cr_2O_7(s)[/tex]
Explanation:
Hello!
In this case, when writing net ionic equations, we first need to identify the complete molecular equation; thus for potassium dichromate reacting with copper (I) bromide, we have:
[tex]K_2Cr_2O_7(aq)+2CuBr(aq)\rightarrow Cu_2Cr_2O_7(s)+2KBr(aq)[/tex]
Thus, since all the species are aqueous except copper (II) dichromate, we can write the complete ionic equation by ionizing the aqueous ones:
[tex]2K^++Cr_2O_7^{2-}+2Cu^++2Br^-\rightarrow Cu_2Cr_2O_7(s)+2K^++2Br^-[/tex]
Finally, for the net ionic equation, we need to cancel out the spectator ions as they are present at both reactants and products sides, thus, we obtain:
[tex]Cr_2O_7^{2-}(aq)+2Cu^+(aq)\rightarrow Cu_2Cr_2O_7(s)[/tex]
Best regards!
In one type of cell division, a single cell forms two new cells. This process is called mitosis. What is a reason that human skin cells frequently undergo mitosis?
Answer:
Explanation:
probably C
Why is it important to know the properties of both solutes and solvents when preparing a solution that is expected to meet a certain need?
Does this involve a chemical change or a physical change? Explain
Answer:
A solution is consist of solute and solvent and they both together determine the properties of complete solution. It is important to know the properties of both solute and solvent because they both depend on each other to meet a certain need, for example: the intermolecular forces between solutes and solvents determine the solubility of solute in solvent and if solutes must be completely dissolved in the solvent for a homogenous mixture.
The combination of solute and solvent to form a solution is a physical process and not a chemical one because it des not change the chemical properties of solute and solvents.
6) How many grams of CCl4 are present in 2.67 moles of CCl4?
Answer:410.6 g
Explanation:
Which of these are highest in fat?
Almonds
Butter
Sesame oil
Answer:
almonds and sesame oil have the same amount of fat.
Explanation:
Almonds: 14 g
Butter: 12 g
Sesame Oil: 14 g
Must all species reproduce in order for the species to survive? *
Answer:
no
Explanation:
Oxidation number for H+
Answer:
+1
The oxidation state of H+ = +1. The Oxidation state of Zn2+ = +2. The oxidation state of H2 = 0. The sum is equal to zero because there are 2 H+ ions.
Explanation:
The speed of a water wave is 6.2 meters/sec. Its wave length is 0.50 meters. What is its frequency, cycles/see?
a. 0.080
b. 12.0
c. 3.10
d. 4.60
e. 0.0806
Answer:
e is right ▶️▶️▶️▶️▶️▶️▶️
Based on the video you just watched, what is contributing to the change in sea level in the Northern Patagonian Ice Field. Why is this area important for climate science research?
Answer:
The area is important for climate science research because they can look at the glaciers and see over the years what is happening with them, are they multiplying or are they decreasing and if so at what rate.
Answer:
Melting glaciers are causing sea levels to rise. It’s important to study natural conditions in the Northern Patagonian Ice Field because the landscape there is dynamic and the effects of climate change can easily be seen. The retreat of the Nef Glacier and the disappearance of icebergs on the lake are evidence of rising temperatures and climate change.
Explanation:
Which ingredient would a company that makes super-sour candy most likely use in large quantities?
nitric acid
zinc hydroxide
citric acid
calcium hydroxide
Answer:
Citric acid
Explanation:
Answer:
On edge it is C or option 3 citric acid
Explanation:
Properties of Gamma rays?
Helpppppppp!!!!!
Some of the properties are:
1. Gamma, γ-rays are not deflected by electric and magnetic fields. It shows that they do not have any charge.
2. Gamma, γ-rays are electromagnetic waves like X-rays. The wavelength of γ-ray photon is smaller than that of X-rays.
3. The rest mass of a Gamma, γ-ray photon is zero. (Photon has mass zero but it has momentum, why?)
4. Gamma, γ-rays travel with the speed of light.
5. Gamma, γ-rays have very large penetrating power. They can pass through several centimeter of iron and lead.
6. Gamma, γ-rays can produce fluorescene in a substance like willimite.
How would you name the number:100 liters?
A. Dekaliter
B. Hectoliter
C. Centiliter
D. Megaliter
E. Other
Answer:
E
Explanation:
Which components of a galaxy move in circular patterns or revolve around a star?
A:Gas
B: Dust
C:Other orbiting objects
D: Sun
Answer:
B
Explanation: hoped this helped!!!
Answer:
it is c no cap
Explanation: C
