Answer:
Si
Explanation:
Dispersion force or London force is the force of attraction between two atoms or molecules in a substance in solid , liquid and gas . In gas , this force is minimum and in solid this force is maximum . In solid this force is maximum in metals in which this force forms metallic bond .
Among the given substances , Si , Sn , MgO , C₂₀H₄₂ are solid , so dispersion force will be high in them .
Among all as mentioned above , Si will have highest dispersion force . It is due to four covalent bond that bind two atoms of Si in solid silicon . Its three dimensional crystal structure consist of silicon atoms , all bound by four covalent bonds .
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
Nitrogen and hydrogen make ammonia. If you begin with 36.2g of nitrogen and excess hydrogen, how many grams of ammonia can you make?
Answer:
Mass = 44.2 g
Explanation:
Given data:
Mass of nitrogen reacted = 36.2 g
Mass of ammonia formed =?
Solution:
Chemical equation:
N₂ + 3H₂ → 2NH₃
Number of moles of nitrogen:
Number of moles = mass/molar mass
Number of moles = 36.2 g / 28 g/mol
Number of moles = 1.3 mol
Now we will compare the moles of nitrogen and ammonia from balanced chemical equation to determine how many moles of ammonia re formed.
N₂ : NH₃
1 : 2
1.3 : 2/1×1.3 = 2.6 mol
Mass of ammonia:
Mass = number of moles × molar mass
Mass = 2.6 mol × 17 g/mol
Mass = 44.2 g
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
How are atoms an example of diversity?
A. Atoms can gain and lose protons.
B. Atoms can change their properties.
C. Atoms behave unpredictably.
D. Atoms form millions of molecules.
D. Atoms form millions of molecules. :)
Answer:
As I guess ans to yr question is D. Atoms from millions of molecules.
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
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:
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
Balance the following equation on scrap paper:
AIF3+Li2O → Al2O3 + LiF
Answer:
2AlF₃ + 3Li₂O —> Al₂O₃ + 6LiF
Explanation:
AlF₃ + Li₂O —> Al₂O₃ + LiF
The above equation can be balanced as follow:
AlF₃ + Li₂O —> Al₂O₃ + LiF
There are 2 atoms of Al on the right side and 1 atom on the left side. It can be balance by writing 2 before AlF₃ as shown below:
2AlF₃ + Li₂O —> Al₂O₃ + LiF
There are 6 atoms of F on the left side and 1 atom on the right side. It can be balance by writing 6 before LiF as shown below:
2AlF₃ + Li₂O —> Al₂O₃ + 6LiF
There are 2 atoms of Li on the left side and 6 atoms on the right side. It can be balance by writing 3 before Li₂O as shown below:
2AlF₃ + 3Li₂O —> Al₂O₃ + 6LiF
Thus, the equation is balanced..!
A student placed one hundred dominoes upright in a row. He knocked over the first domino and the rest all fell over; one after another. What made the domino at the end of the row move?
a.chemical energy
b.heat energy
c.mechanical energy
d.electric energy
Answer:
b. heat energy
Explanation:
The domino at the end of the row move should be heat energy.
What is heat energy?Heat energy refers to the energy where it leads to the small particles movement. It can be treated as the atoms, molecules, etc. Also, the one object to other object should be shifted in this. Since the student placed one hundred dominoes upright in a row so here the heat energy should be used.
Learn more about energy here; https://brainly.com/question/17172186
Why is the movement of water between land, oceans and living things
important?
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.
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.
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.
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:
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
what are the two ways light moves through space? for astronomy the solar system
Answer:
The Solar System moves through the galaxy with about a 60° angle between the galactic plane and the planetary orbital plane. The Sun appears to move up-and-down and in-and-out with respect to the rest of the galaxy as it revolves around the Milky Way
Explanation:
Hope you like it
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]
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
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 ▶️▶️▶️▶️▶️▶️▶️
Please Answer the Question
Answer:
Explanation:
I think it is D
The heating of 7.820 g of hydrated magnesium sulfate (MgSO4 • xH2O) crystals results in a mass of 3.547 g of anhydrous magnesium sulfate. Determine the formula of this hydrate. Name this formula.
MgSO₄•8H₂O
Magnesium sulfate octahydrate
Further explanationGiven
7.820 g of Magnesium sulfate (MgSO₄ • xH₂O)
3.547 g of anhydrous magnesium sulfate
Required
The formula
Solution
Mass of H₂O :
= 7.820 g - 3.547 g
= 4.273 g
MW MgSO₄=120 g/mol
MW H₂O = 18 g/mol
Mol ratio MgSO₄ : H₂O
= 3.547/120 g/mol : 4.273/18
= 0.0295 : 0.2374
= 1 : 8
The formula :
MgSO₄•8H₂O
Magnesium sulfate octahydrate
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.
What types of solutes are electrolytes when they dissolve in water to form solutions?
Since water does not have charged particles, water is a non-conductor. When some solutes dissolve in water they allow an electric current to flow through the water and the solution conducts electricity. These solutes are called electrolytes. ... Non-electrolytes like sugar dissolve to form molecules in solution.
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
The term that refers to how much of a solute can be dissolved is
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!
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!
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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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!!~ (=^▽^=)
