Which gas effuses faster at the same temperature: molecular oxygen or atomic argon?

Answer:

A toad on lily pad

Explanation:

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arts Per Thousand ... Click advance year 10 times. ... Which organism was most hurt by increased storms, and why do you think this is so? ... On the Coral Reef tab I see less fish and on the Data tab I see Staghorn Coral has majorly decreased. ... B. How does this change the populations of the two species that eat algae, ...

Answer:

increase: yellow tail snapper

decrease: grouper, parrotfish, angelfish

Explanation:

Answer:

50mL of the 0.1M acid are needed to neutralize the solution

Explanation:

To solve this question we have to calculate the moles of OH- present in the basic solution. Based on the reaction:

2OH- + H2CO3 → 2H2O + CO3²⁻

we can find the moles of carbonic acid (And its volume) required for the complete neutralization as follows:

Moles OH-:

pH = -log [H+]

10^-pH = [H+]

[H+] = 1x10⁻⁸M

As:

[OH-] = Kw / [H+]

[OH-] = 1x10⁻¹⁴ / 1x10⁻⁸

[OH⁻] = 1x10⁻⁶M

The moles in 10000L are:

10000L * (1x10⁻⁶moles OH- / L) = 0.01 moles OH-

Moles H₂CO₃ required:

0.01 moles OH- * (1mol H₂CO₃ / 2mol OH⁻) = 0.005 moles H₂CO₃

Volume:

0.005 moles H₂CO₃ * (1L / 0.1moles) = 0.05L =

Answer:

32

Explanation:

Answer:

D

Explanation:

Before it can be used in a reactor for electricity generation, however, it must undergo a series of processes to produce a useable fuel. For most of the world's reactors, the next step in making the fuel is to convert the uranium oxide into a gas, uranium hexafluoride (UF6), which enables it to be enriched.

Unstable U-235 must be enriched with 5% U-238 to stabilize it.​ Hence, option D is correct.

Radioactivity is the phenomenon of the spontaneous disintegration of unstable atomic nuclei into atomic nuclei to form more energetically stable atomic nuclei.

Before uranium can be used in a reactor for electricity generation, however, it must undergo a series of processes to produce a useable fuel.

For most of the world's reactors, the next step in making the fuel is to convert the uranium oxide into a gas, uranium hexafluoride (UF6), which enables it to be enriched.

Hence, option D is correct.

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Answer:

The correct approach is "-2.67 kJ/mole". A further solution is described below.

Explanation:

The given values are:

No. of moles,

= 5.60 mol

Substance releases,

ΔH = 14.9 kJ

Now,

The ΔH in terms of kJ/mol will be:

= [tex]\frac{\Delta H}{5.60}[/tex]

On putting the given values of ΔH, we get

= [tex]\frac{-14.9}{5.60}[/tex]

= [tex]-2.67 \ kJ/mole[/tex]

Answer:

[tex]r_{He}=169.7m/s[/tex]

Explanation:

Hello there!

In this case, since this problem can be understood via the Graham's law, which states that states that the rate of diffusion or of effusion of a gas is inversely proportional to the square root of its molecular weight, which can be extrapolated to the rate, we have:

[tex]\frac{r_{O_2}}{r_{He}} =\sqrt{\frac{M_{He}}{M_{O_2}} }[/tex]

Thus, since the molar mass of helium is 4.0 g/mol and that of oxygen is 16.0 g/mol, we solve for the average velocity of helium as shown below:

[tex]r_{He}=r_{O_2}\sqrt{\frac{M_{He}}{M_{O_2}} }\\\\r_{He}=480m/s\sqrt{\frac{4.0g/mol}{32.0g/mol} }\\\\r_{He}=169.7m/s[/tex]

Regards!

Answer:

i hope this helps

...............................

Count the in between joint bunches of curve lines .

Frequency is 3-1=2

Answer: +7

Explanation: Sum of all the oxidation numbers in a polyatomic ion is equal to the charge on the ion. Thus, the total charge on the polyatomic anion is −1. Thus, the oxidation number of Mn in MnO−4 is +7.

Answer:

43.7 g

Explanation:

unit mass of NaCl = (23 + 35.5) u = 58.5 u

58.5 is the mass of one unit formula of NaCl (since NaCl is not a molecular compound)

1 u = 1.661×10^-24 g

if 1 unit formula of NaCl has 58.5 u, then 4.5×10²³ units of NaCl will have:

58.5 u × (1.661×10^-24 g/1 u) × 4.5×10²³ = 43.7 g

Answer:

h20 o3vbjbxhnnhbnkknnchemesry

The two main postulates that was given by Antoine Lavoisier are, oxygen play an important role in combustion and the other is mass of the reactant and product is conserved. The total mass will be 200g in the flask after the reaction occurs.

According to Law of conservation of mass, mass can neither be created nor be destroyed. Mass can only be transformed from one form to another. The law of conservation of mass was given by Antoine Lavoisier. Every reaction in nature follow the law given by Antoine Lavoisier that is mass is always conserved.

The total mass of reactant water, phosphorous is 200g, then the total mass of product will remain same after reaction according to law of conservation of mass.

Therefore, the total mass will be 200g in the flask after the reaction occurs.

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Answer:

-943J or 943J released

Explanation:

m=2.4 mol x 207.g/ mol=497.3g

c=.129 J/gC

T= T f-Ti=(22.5-37.2)=-14.7C

Q=?

Q=(49.3g)(.129 J/g C) (-14.7 C)

= -943 J or 943 J released

Answer:

b 2.00

Explanation:

I am pretty sure that is right

Answer:

Una onda es una perturbación que se propaga en el espacio, transportando energía pero no materia.

Explanation:

Q.1-

Given,

mass - 10grams

volume - 24 cm³

density = mass/volume

density = 10/24

density = 0.416 g/cm³

Q.2-

Given,

mass - 700grams

volume - 1100cm³

density = mass/volume

density = 700/1100

density = 0.6363 g/cm³

Answer: 1.00 m

Explanation:

Answer:

Hydrophilic

Explanation:

A hydrophilic substance is any substance that interacts efficiently with water.

Since water is a polar solvent, a hydrophilic substance must also be polar in order to interact with water since like dissolves like in chemistry.

The fact that sugar disappears in hot water indicates that sugar is a polar hydrophilic substance because only a polar solute can dissolve in water

Based on her observation of sugar dissolving in hot water, she can properly

conclude that the sugar is hydrophilic.

A substance is said to be hydrophilic when it is able to react and dissolve in

water due to the attractive force between them. Hydrophobic substances

don't dissolve in water.

In this scenario, we were told the sugar dissolved completely in water which

means that the sugar is hydrophilic.

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Answer:

D

Explanation:

You balance an equation so that all the elements have the same number of atoms on each side of the equation.

Answer:

                                        N2 + 3H2 → 2NH3

Explanation:

Answer:

2.53%

Explanation:

mass percent = (mass of solute/mass of solution)×100%

mass percent = [6.5 g/(6.5 + 250) g]×100% = 2.53%

Answer:

Protein

Explanation:

Which builds muscles

Answer:

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Answer: Covalent bonding occurs when electrons are shared between atoms. The correct option is A.

Explanation:

When atoms form a bond by sharing one or more pairs of electrons the bond is referred to as a COVALENT BOND. This is so because CV there is a natural drive for atoms to attain the electronic configuration of Group 0 which has a completely filled outermost shell of eight electrons. The covalent bond usually occurs among non- metals. Example of covalent bonding is seen in the formation of chlorine and carbondioxide molecules. Chloride atom which contains seven electrons in its outermost shell shares an electron with another chloride atom to attain a filled outermost shell leading to the formation of a chlorine molecule.

The characteristics of a covalent compound includes:

--> they contain only molecules. There are no ions, hence they do not conduct electricity.

--> they dissolve in organic solvents. They are insoluble in water.

--> they have low melting and boiling points.

Answer:

NH3(aq) and HCl(aq) are the reactants, while NH4Cl(aq) is the product.

Explanation:

The hydrogen atom from the HCl molecule joins the other three in NH3 creating a four hydrogen molecule,  NH4Cl.

Answer:

Explanation:

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