why is helium heavier than hydrogen​

Explanation:

To find the volume of dry hydrogen gas at STP, we need to use the combined gas law, which relates the pressure, volume, and temperature of a gas.

The combined gas law is given by:

(P1 V1) / (T1) = (P2 V2) / (T2)

where P1, V1, and T1 are the initial pressure, volume, and temperature of the gas, and P2, V2, and T2 are the final pressure, volume, and temperature of the gas.

First, we need to adjust the initial volume of hydrogen to account for the presence of water vapor. The total pressure in the eudiometer is the sum of the pressure of the hydrogen gas and the pressure of the water vapor, which is equal to the partial pressure of water vapor in the air. The partial pressure of water vapor can be found using a vapor pressure table at the given temperature of 21°C, which is 18.7 mmHg.

Thus, the initial pressure of the hydrogen gas is equal to the total pressure minus the partial pressure of water vapor:

P1 = 735 mmHg - 18.7 mmHg = 716.3 mmHg

Now we can plug in the values into the combined gas law and solve for V2, the volume of the dry hydrogen gas at STP:

(P1 V1) / T1 = (P2 V2) / T2

where P2 = 1 atm (at STP) and T2 = 0°C = 273 K

V2 = (P1 V1 T2) / (T1 P2)

V2 = (716.3 mmHg x 35.5 mL x 273 K) / (294 K x 760 mmHg)

V2 = 29.5 mL

Therefore, the volume of dry hydrogen gas at STP is 29.5 mL.

Answer:

15

Explanation:

it would probably be the same number!

Answer:

Explanation:

15

The colour of the phenol red-containing solution would shift toward yellow.

Carbon dioxide is a colourless and acidic gas that is found in trace amounts in the atmosphere. When it reacts with water, carbonic acid is formed.

One of the properties of an acid is that it has the ability to turn blue litmus paper to red.

When Carbondioxide is used as a reactant, the phenol red-containing solution will shift toward yellow because the pH of the solution is less than 7 and turns blue as carbon dioxide is consumed and the pH of the solution rises to 7 or greater.

Note that acidity is pH of 0- 6 and basic solutions are from 8 - 14 in a pH scale.

Therefore, the colour of the phenol red-containing solution would shift toward yellow.

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Answer:

C - raising the temperature of a gas

Explanation:

as you raise temperature, kinetic energy rises, and so does pressure

Answer:

C.

raising the temperature of the gas

Explanation:

Edg. 2020

Other guy is right i got 100%

The ΔG°rxn for the given reaction is -533.4 kJ.

To calculate the ΔG°rxn (standard Gibbs free energy change) for the given reaction, we can use the standard Gibbs free energy of formation (ΔG°f) values for each compound involved. The equation is:

ΔG°rxn = ΣnΔG°f(products) - ΣmΔG°f(reactants)

Where n and m are the stoichiometric coefficients of the products and reactants, respectively.

Given the following ΔG°f values (in kJ/mol):

ΔG°f(H₂S) = -33.4

ΔG°f(O₂) = 0 (since it is an element in its standard state)

ΔG°f(SO₂) = -300.1

ΔG°f(H₂O) = -228.6

Plugging in the values into the equation:

ΔG°rxn = [2ΔG°f(SO₂) + 2ΔG°f(H₂O)] - [2ΔG°f(H₂S) + 3ΔG°f(O₂)]

ΔG°rxn = [2(-300.1) + 2(-228.6)] - [2(-33.4) + 3(0)]

ΔG°rxn = -600.2 - (-66.8)

ΔG°rxn = -533.4 kJ

Therefore, the ΔG°rxn for the given reaction is -533.4 kJ.

The complete question is:

Calculate the ΔG°rxn using the following information.

2 H₂S(g) + 3 O₂(g) → 2 SO₂(g) + 2 H₂O(g) ΔG°rxn = ____ kJ

ΔG°f (kJ/mol) -33.4 -300.1 -228.6

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Formal charge for nitrogen atoms I, II, and III, respectively in the azide provided is 0, +1, and -1

A formal charge, in the covalent chemical bonding, refers to the hypothetical charge assigned to an atom in a molecule, based on the assumption that electrons in all chemical bonds are shared equally between atoms, regardless of relative electronegativity. In other words, formal charge is defined as the difference between the number of valence electrons of an atom in a neutral free state and the number assigned to that atom in a Lewis structure. It is given as

Formal charges = Group variance – nonbonding electrons – ½ bonding electron

For the nitrogen atom I,

Formal charges =5 – 2 – ½ (6) = 0

For the nitrogen atom II,

Formal charges =5 – 0 – ½ (8) = 1

For the nitrogen atom III,

Formal charges =5 – 4 – ½ (4) = -1

Note: The question is incomplete as it is missing the figure which is attached.

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Answer:

Electrical Conductivity of the substance

Explanation:

Ionic substances do not conduct electricity in their solid state however they are good conductor of electricity when dissolved in water or in their molten state.

A test can be carried out to see if the substance matches the property above.

Answer:

1/2 or 50%

Explanation:

The probability would be 1/2 or 50%.

Color blindness is generally an X-linked recessive traits. Since males only have one X chromosome, they are either affected or not affected but females with two X chromosomes can be a carrier in addition to being affected or unaffected.

Also, males usually get their X chromosomes from their mothers while the two X chromosomes in females are contributed by each parents.

Let the allele for colour blindness be b.

Genotype of Steve would be \(X^bY\)

Since, they produced a male child with color blindness, Mary is a carrier with the genotype: \(X^BX^b\)

\(X^bY\)   x   \(X^BX^b\)

progeny: X^BX^b (carrier female), X^bX^b (affected female), X^BY (unaffected male), and X^bY (affected male)

Probability of producing color blind children = 2/4 = 1/2

Hence, the probability of their new born baby being color blind remains 1/2 or 50%

Answer:

Soda and wine is the answer to your question.

Explanation:

yo make salt you need a base and an acid. in this case the base is soda and the wine is acid. hope that helps :)

Answer:

The SI unit of volume is m³

In the reaction 2Fe3+(aq) + 2Hg(l) + 2Cl−(aq) → 2Fe2+(aq) + Hg2Cl2(s), the species that loses electrons is Hg(l).

Here, mercury (Hg) undergoes oxidation, changing from Hg(l) to Hg2Cl2(s), and in the process, it loses electrons to form a bond with Cl− ions.

Hg(0)     →        Hg(+1)    +      1 e-

And Iron undergoes reduction, Fe3+ (aq) accepts one electron to become Fe2+ (aq).

Fe(+3)    +      1 e-      →       Fe(+2)

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Answer:

The atoms in a solid tend to attract each other, more than they are attracted by another substance, which I suppose is one definition of a solid. So strictly speaking, atoms from one solid will not get caught up in the atomic bonding structure of another solid just by placing them together.

Answer:

London dispersion, dipole-dipole interactions, hydrogen bonding

Explanation:

Please mark brainliest

Answer:

lodine monochloride- dipole-dipole interactions

Acetone-London dispersion

A mixture of water (H2O) and hydrogen fluoride-hydrogen bonding

Explanation:

Edg 2020 (Brainliest Lol)

Answer:

Choice D) 1 mL pipet

Explanation:

If you are trying to extract 0.02 mL of HCl, you are going to need a piece of equipment that can measure very small units. Thus, Choice D would be the correct answer.

a. Silver coin - Element (Silver is a pure element and is not chemically combined with any other element in a silver coin)

b. Air - Mixture (Air is a mixture of gases, primarily nitrogen and oxygen, with trace amounts of other gases and particles)

c. Coffee - Mixture (Coffee is a mixture of various compounds such as water, caffeine, and organic compounds that give it its flavour and aroma)

d. Soil - Mixture (Soil is a mixture of various substances such as minerals, organic matter, water, and air)

My everyday experiences influenced my response because I have come across these examples in my daily life and have been taught about them in science classes. For example, I know that air is composed of different gases and particles, and that soil is made up of a mixture of substances, including minerals and organic matter. Similarly, I know that a silver coin is made of pure silver and that coffee is made of various compounds.

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Answer:

D) 1:2

Explanation:

Answer:

Whats the question? I would love to help...

As atomic radius decreases, electronegativity increases. This is mostly because a smaller atomic radius represents a stronger hold on the valence electrons.

Answer:

Outside air

Nose

Lungs

Bloodstream

Cell

Explanation:

We breathe in oxygen from the outside air in through our nose and it travels to our lungs. Inside our lungs, we have Avioli's that diffuse oxygen into our bloodstream and the bloodstream helps the oxygen travel into our cells.

Hope this helps :)

Respiration is the process of exchange of gases between the cell and atmosphere. The path of respiration involves Outside Air⇒  Nose⇒ Lungs⇒ Bloodstream⇒ Cell.

Respiration is the movement of oxygen from the outside environment to the cells and the removal of carbon dioxide from the cells into the outside environment.

Respiration is of two types depending upon the presence of oxygen:

1. Aerobic Respiration: This takes place in the presence of oxygen

2. Anaerobic Respiration: This takes place in the absence of oxygen.

The path of respiration includes inspiration of outside air into the nose, through the nostrils this air is passed on to the lungs. The alveoli is the site of gaseous exchange in the lungs. In the lungs, oxygen is inspired and carbon dioxide is expired.

The oxygen gas which is inspired by the lungs is dissolved in the blood. Oxygen forms a complex with the hemoglobin protein present in the blood. This blood is then circulated to all the cells and tissues of body. Thus, the oxygen is supplied to all the cells and tissues. The path includes Outside Air⇒  Nose⇒ Lungs⇒ Bloodstream⇒ Cell.

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Answer:

The extraction is done by electolysis but first the aluminium oxide must be melted so that electricity can pass through it...The use of molten cryolite as a solvent reduces some of the Energy

costs involved in extracting aluminum by allowing the ions in aluminum oxide to move freely at low temperature ..

If the freezing point depression for a solution is 2.5°c and kf = 4.5°c/m, the molality of the solution is

m= 0.56m

While molecular weight (MW) and molecular weight (MW) may be used to measure concentration, molecular weight (MW) and molecular weight (MW) is used to measure molecular weight and concentration, respectively.

Generally, the equation for  of freezing point of depression with molality is  mathematically given as

\(\Delta T_{f} = k_{f} *m\)

Therefore

m = 2.5/4.5

m= 0.56m

In conclusion,  the molality of the solution  is 0.56m

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Answer: Molecules contain two or more atoms and are held together by covalent bonds, whereas compounds are held together by ionic bonds. Two or more elements bonded together through ionic attraction. Compounds contain two or more atoms and are held together by ionic bonds, whereas molecules are held together by covalent bonds.

Explanation:

The atomic number of rubidium is 37, it means that its electron configuration is as follows:

Rubidium is an alkali metal. Its ion is formed when it loses an electron. It means that the rubidium ion has 36 electrons instead of 37, and its configuration is as follows:

c) The rates of the forward and reverse reactions are equal. When the forward and reverse processes move ahead and backward at the same pace, with no discernible change in the system, this is referred to as dynamic equilibrium for reversible processes.

Dynamic equilibrium occurs when, given a reversible process, the rate of the forward reaction equals the rate of the reverse reaction. Although it appears that nothing is happening because the two rates are equal, the reaction is actually continuing at its steady rate. The equilibrium state is one in which there is no net change in the concentrations of reactants and products. The opposite is true; at equilibrium, both forward and reverse reactions proceed at the same rate, maintaining the net concentrations of reactants and products as is.

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N and 0 atoms have first ionization potentials of 14.6 and 13.6 eV, respectively.

Option A is correct.

Because of its electronic configuration, which is half-full, nitrogen has a greater ionization energy than oxygen. After losing an electron, oxygen adopts a half-full electronic configuration, resulting in a lower ionization energy than nitrogen.  Oxygen has a lower first ionization energy than nitrogen.

The first ionization energy fluctuates uniformly throughout the periodic table. Over time, the ionization energy increases from left to right and decreases from top to bottom in groups. Accordingly, helium has the biggest first ionization energy, while francium has quite possibly of the most minimal.

Incomplete question :

The first ionization potential in electron volts of nitrogen and oxygen atoms respectively are given by

A. 14.6, 13.6

B. 13.6, 14.6

C. 13.6, 13.6

D . 14.6, 14.6

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The energy is required to take a 15.0-g sample of ice at −15.0 °c to liquid water at 45.0 °c is 8.30kj.

The term enthalpy is defined as the sum of the system's internal energy and the product of its pressure and volume.  

Ice warming Cs = 2.09 J/g∙°C

Enthalpy of fusion ∆H = 6.02 kJ/mol

Liquid water warming Cs = 4.18 J/g∙°C

Enthalpy of vaporization ∆H = 40.7 kJ/mol

Steam Warming Cs = 2.01 J/g∙°C

Step 1: Warm ice from −15.0°C to 0°C.

q1 = 470.25 joule

Step 2: Melt ice.

q2 = 5016.66

Step 3: Warm liquid water from 0°C to 45.0°C.

q3 = 2821.5 joule

The total energy is the sum of the energy of each step.

q = q1 + q2 + q3

= 470.25 + 5016.66 + 2821.5

= 8.30kj

Thus, energy is required to take a 15.0-g sample of ice at −15.0 °c to liquid water at 45.0 °c is 8.30kj.

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No, all wavelengths/photons of light are emitted from excited electrons.

Wavelength is the distance between identical points (adjacent crests) in the adjacent cycles of a waveform signal propagated in space or along a wire.

When an atom's electrons move to a lower energy state, the atom releases energy in the form of a photon. Depending on the energy involved in the emission process, this photon may or may not occur in the visible range of the electromagnetic spectrum.

Hence, no, all wavelengths/photons of light are emitted from excited electrons.

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Answer:

it is where the ozone layer is locate which is affected by human activities