Which of the two Lewis/electron dot structure representations, which is
the correct one for oxygen gas? PICTURE BELOW

Answer:

Gymnosperm and Angiosperms both are plant groups but Gymnosperm is just very large leaves that come out of the ground and Angiosperms have flowers. Gymnosperm produce seeds in pine cones for example. Some plants in the Gymnosperm group of plants are pines. They produce naked seeds which means that they aren't protected by a ovary (Fruit like an apple) to help them get planted. Angiosperms have seeds that come out of their flowers and are called covered seeds. When the plant is about to die, it's seeds fall out and either float away and grow later of fall where the plant is. Also, insects carry them places too.

Hope this helps.

Answer: (a) Mole fraction of [tex]H_{2}[/tex] is 0.66.

Mole fraction of [tex]N_{2}[/tex] is 0.33

(b) The partial pressure of [tex]H_{2}[/tex] is 1.98 atm.

The partial pressure of [tex]N_{2}[/tex] is 0.99 atm.

(c) The total pressure is 3.0 atm

Explanation:

Given: Volume = [tex]22.4 dm^{3}[/tex]  (1 [tex]dm^{3}[/tex] = 1 L) = 22.4 L

Moles of [tex]H_{2}[/tex] = 2.0 mol

Moles of [tex]N_{2}[/tex] = 1.0 mol

Total moles = (2.0 + 1.0) mol = 3.0 mol

Temperature = 273.15 K

[tex]PV = nRT\\[/tex]

where,

P = pressure

V = volume

n = number of moles

R = gas constant = 0.0821 L atm/mol K

T = temperature

Substitute the values into above formula as follows.

[tex]PV = nRT\\P \times 22.4 L = 3.0 mol \times 0.0821 L atm/mol K \times 273.15 K\\P = 3.0 atm[/tex]

The mole fraction of [tex]H_{2}[/tex] is calculated as follows.

[tex]Mole fraction = \frac{moles of H_{2}}{moles of H_{2} + moles of N_{2}}\\= \frac{2.0 mol}{(2.0 + 1.0) mol}\\= 0.66[/tex]

The mole fraction of [tex]N_{2}[/tex] is as follows.

[tex]Mole fraction = \frac{moles of N_{2}}{moles of H_{2} + moles of N_{2}}\\= \frac{1.0 mol}{(2.0 + 1.0) mol}\\= 0.33[/tex]

Partial pressure of [tex]H_{2}[/tex] are as follows.

[tex]P_{H_{2}} = P_{total} \times mole fraction of H_{2}\\= 3.0 atm \times 0.66\\= 1.98 atm[/tex]

Partial pressure of [tex]N_{2}[/tex] are as follows.

[tex]P_{N_{2}} = P_{total} \times mola fraction of N_{2}\\= 3.0 atm \times 0.33\\= 0.99 atm[/tex]

Answer:

Age ≅ 7500 years

Explanation:

All radioactive decay is 1st order kinetics and described by the expression

A = A₀e^-kt => t = ln(A/A₀) / -k

k = 0.693 / t(half life) = (0.693 / 5730)yrs⁻¹ = 1.21 x 10⁻⁴ yrs⁻¹

t = Age = [ln(0.103/0.255) / - 1.21 x 10⁻⁴] yrs = 7500 years

Solution :

When non volatile solute is added to solvent, vapor pressure gets lowered.

Relative lowering in vapor pressure is given :

[tex]$\frac{P^0-P}{P^0}$[/tex]   = [tex]$\text{mole fraction}$[/tex] of solute

[tex]$\frac{P^0-P}{P^0}=x_B$[/tex]

[tex]$P^0$[/tex] = vapor pressure of pure solvent

P = vapor pressure of solution

[tex]$x_B$[/tex] = mole fraction of solute

[tex]$x_B=\frac{n_B}{n_A+n_B}$[/tex]

[tex]$n_B $[/tex] = [tex]$\text{number of moles of solute}$[/tex]

[tex]$n_A$[/tex] = [tex]$\text{number of moles of solvent}$[/tex]

Number of moles [tex]$=\frac{\text{weight}}{\text{molecular weight}}$[/tex]

[tex]$\frac{P^0-P}{P^0}=\frac{w_B/M_B}{w_A/M_A+w_B/M_B}$[/tex]

            [tex]$\approx \frac{w_B/M_B}{w_A/M_A}$[/tex]

1. For 10 g of [tex]$CH_3COOK$[/tex]

         [tex]$CH_3COOK \rightarrow CH_3COO^- + K^+$[/tex]

  Ions = 2

It will affect colligative property.

[tex]$\frac{P^0-P}{P^0} = \frac{i \times 10/98}{w_A/M_A}$[/tex]

Relative lowering in vapor pressure will be :

[tex]$=\frac{2 \times 10/98}{w_A/M_A}$[/tex]

[tex]$=\frac{0.20}{w_A/M_A}$[/tex]

2. For 20 g sucrose

Sucrose is non electrolyte, i = 1

[tex]$\frac{P^0-P}{P^0} = \frac{ 20/342}{w_A/M_A}$[/tex]

            [tex]$=\frac{0.050}{w_A/M_A}$[/tex]

3. For 20 g of glucose.

   Glucose is a non electrolyte, i = 1

   [tex]$\frac{P^0-P}{P^0} = \frac{20/180}{w_A/M_A}$[/tex]

               [tex]$=\frac{0.11}{w_A/M_A}$[/tex]

[tex]$w_A/M_A$[/tex] is same in all three solutions.

Hence, lowering in vapor pressure is maximum in [tex]$CH_3COOK$[/tex] and minimum is Sucrose.

Vapor pressure from lowest to highest.

10 g of [tex]$CH_3COOK$[/tex] < 20 g of glucose < 20 g of sucrose

The pressure exerted by vapor to the other gas is called vapor pressure.

The formula used to solve the question is as follows:-

[tex]\frac{P^o -P}{P^o}[/tex]

The water vapor depends on the following:-

After solving the equation, the correct sequence is as follows:-

[tex]CH_3COOK > GLUCOSE > SUCROSE[/tex]

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The partial pressure of Xe in the mixture is 1.850 atm. (partial pressure of Xe = Total pressure - Partial pressure of He - Partial pressure of Ar = 1.850 atm).

To find the partial pressure of Xe, we need to subtract the partial pressures of He and Ar from the total pressure.

Total pressure = partial pressure of He + partial pressure of Ar + partial pressure of Xe

Given:

Total pressure = 2.40 atm

Partial pressure of He = 0.300 atm

Partial pressure of Ar = 0.250 atm

Let's solve for the partial pressure of Xe:

Partial pressure of Xe = Total pressure - Partial pressure of He - Partial pressure of Ar

Partial pressure of Xe = 2.40 atm - 0.300 atm - 0.250 atm

Partial pressure of Xe = 1.850 atm

Therefore, the partial pressure of Xe in the mixture is 1.850 atm.

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Answer:

0.5875L

Explanation:

concentration = mole/ volume

n(LiCl) = 20 / (7 + 35.5) = 0.47 mol

volume = mole / conc.

volume = 0.47 /0.8

= 0.5875 dm³ = 0.5875L

Answer:

yes

Explanation:

cuz is a square and if all angles are equal of a square then it is correct

Explanation:

because there is 2 hydrogen atoms in the reactions side of the equation (you can tell because the H has a 2 in the subscript) you have to have 2 hydrogen atoms in the reactants side to help balance out the equation. and since the copper and oxygen atoms are already balanced there is no coefficient needed.

Answer:  dispersion forces, dipole-dipole and hydrogen bonds

Explanation:

Answer:

10 molecules of NH₃.

Explanation:

N₂ + 3H₂ --> 2NH₃

As the N₂ supply is unlimited, what we need to do to solve this problem is convert molecules of H₂ into molecules of NH₃. To do so we use the stoichiometric coefficients of the balanced reaction:

10 NH₃ molecules could be prepared from 15 molecules of H₂ and unlimited N₂.  

Answer:

1.19 is the answer

Explanation:

Answer:

[tex]{\huge\blue{\fbox{{࿐ᑕᗩᖇᗷOᑎᗩTᗴ IOᑎ࿐}}}}[/tex]

✏The fizz in the club soda, the foaming effect in the washing soda are all due to carbonate ions. Carbonate is a salt of carbonic acid possessing the molecular formula CO32–. The main group of elements used as carbonates are alkali and alkaline earth metals.

✏ [tex]CO3 ^{2 - } [/tex]

ʰᵒᵖᵉ ⁱᵗ ʰᵉˡᵖˢ

Answer: prism

Explanation: A prism is a polyhedron, with two parallel faces called bases. The other faces are always parallelograms. The prism is named by the shape of its base.

Answer:

Venus

Explanation:

Similar in structure and size to Earth, Venus spins slowly in the opposite direction from most planets. Its thick atmosphere traps heat in a runaway greenhouse effect, making it the hottest planet in our solar system with surface temperatures hot enough to melt lead.

Answer:

Venus

Explanation:

Hope helps

FeCl2 + Na2CO3 = FeCO3 + 2NaCl

Answer:

hi

Explanation:

I'm just figuring this out

Answer:

The answer is in the problem

Explanation:

As general rule of number of oxygen is -2:

O → -2

Alkali metals (Li, Na, K) are always +1

Na → +1

Alkali earth methals (Be, Mg, Ca...) are always +2

Ca → +2

The halogen group (F, Cl, Br...) is always -1

F → -1

The oxidation number of Si (+/- 4)

Aluminium is, usually +3

And to complete the octet rule in nitrogen, 3 electrons are required. That means:

N → -3

Explanation:

Nuclear power plants deliver electricity 24 hours a day, 7 days a week, irrespective of weather and seasons. As well as reducing greenhouse gas emissions, nuclear generation helps reduce air pollution

Answer:

D

Explanation:

Just did the test

Answer:

False

Explanation:

Answer:

0.2878 liters

Explanation:

It is possible to make 0.2878 liters of 4 M solution of lithium bromide using 100 grams of the compound.

Answer: yes they come in different colors.

Explanation:

Most shades of soil is mostly black,brown,red,gray,and white the color of soil and other properties including texture, structure, and consistency are used to distinguish and identify soil.

Answer:

λ Represents:-

-TheUnknownScientist

Answer:

a < c < b < d

Explanation:

The weak acid with the lowest pKa will be the most acidic. In the other way, the conjugate base which the acid is weakest will be strongest.  

The weak base with the lowest pKb will be the most basic. And the conjugate base of the weakest base will be a strongest acid.

Using the values:

Ka HCN = 4.9x10⁻¹⁰

Kb HONH2 = 1.1x10⁻⁸

Ka HClA 3.0x10⁻⁸

Kb C2H5NH2 = 6.4x10⁻⁴

The NaNO3 is the conjugate base of a strong acid as HNO3. That means its solutions are almost neutral

The HONH3Br is the conjugate acid of a weak base. Its solutions will be acidics

C2H5NH3Cl is the conjugate acid of a weak base as ethylamine, its solutions will be acidic.

As ethylamine has a lower pkb than hydroxylamine, the conjugate acid of hydroxylamine will be more acidic.

NaF is the conjugate base of a weak acid as HF. Its solutions will be basics

The order in increasing pH is:

HONH3Br < C2H5NH3Cl < NaNO3 < NaF

Answer: I'm not sure what your question is but i'll answer as best as I can.

Explanation:

Since X is equal to 7 H and we know that H is equal to 1.008, we can just do 7x1.008 = 7.056 g. I hope i helped and please clarify more in the future.

The atomic mass of an element is given by the sum of the mass of protons and neutrons. The element X is lithium as it has a mass of 6.941 u.

Atomic mass is the sum of the masses of the isotopes of that element and is given by adding the masses of the number of protons and neutrons of the elemental atom.

The atomic mass of one hydrogen atom is 1.008, so seven hydrogens will be, 7 x 1.008 = 7.056 g. Now, from the periodic table, it can be seen that an atomic mass of 7.056 g is closest to the atomic mass of a lithium atom (6.941 u).

From the mass, it can be said that seven hydrogen atom has an equivalent mass as that of one lithium atom in the periodic table. The lithium atom has atomic number 3 and an atomic mass of 6.941 g/mol.

Therefore, element X is lithium.

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Answer:

6.502 x 10²⁴ atoms.

Explanation:

First we convert 158.4 g of CO₂ into moles, using carbon dioxide's molar mass:

Then we calculate how many CO₂ molecules are there in 3.6 moles, using Avogadro's number:

As there are 3 atoms per CO₂ molecule, we triple the number of CO₂ molecules in order to get the answer:

The closest answer is the third option,  6.502 x 10²⁴ atoms.

Answer:

[tex]28.037\ \text{s}[/tex]

Explanation:

[tex][A]_0[/tex] = Initial concentration = 1.28 M

[tex][A][/tex] = Final concentration = [tex]0.17[A]_0[/tex]

k = Rate constant = 0.0632 s

t = Time taken

For first order reaction we have the relation

[tex]kt=\ln\dfrac{[A]_0}{[A]}\\\Rightarrow t=\dfrac{\ln\dfrac{[A]_0}{[A]}}{k}\\\Rightarrow t=\dfrac{\ln\dfrac{[A]_0}{0.17[A]_0}}{0.0632}\\\Rightarrow t=28.037\ \text{s}[/tex]

Time taken to reach the required concentration would be [tex]28.037\ \text{s}[/tex].

Answer:

D

Explanation:

D is the answer because 2 is needed to know

Answer:

B) 3 and 7

Explanation:

i just took the test