2) If a solid line represents a covalent bond and a dotted line represents intermolecular attraction, which of the choices shows a hydrogen bond?
H−H
H3N⋅⋅⋅⋅⋅⋅H−O−H
H
3
N
⋅
⋅
⋅
⋅
⋅
⋅
H
−
O
−
H
H4C⋅⋅⋅⋅⋅⋅H−F
H
4
C
⋅
⋅
⋅
⋅
⋅
⋅
H
−
F
H2O⋅⋅⋅⋅⋅⋅H−CH3

Answer:

I hope this helps

Explanation:

The mass of iron which is needed to react with 16.0 grams of sulphur is 28 grams

How to balanced the given equation?

The balanced chemical equation for the reaction between iron and sulfur  to form iron sulfide is:

8 Fe + S₈ → 8 FeS

From the balanced chemical equation, we can see that 8 moles of Fe react with 1 mole of S₈ to form 8 moles of FeS.

To determine the mass of iron required to react with 16 grams of sulfur, we first need to calculate the number of moles of sulfur present in 16 grams of S.

The molar mass of S is 32.06 g/mol (the atomic mass of S is 32.06). Therefore, the number of moles of S in 16 grams is:

n(S) = m(S) / M(S) = 16 g / 32.06 g/mol = 0.499 mol

The molar mass of 8 moles of iron will be 448 grams

∴56 × 8 = 448 grams

Similarly the molar mass of S₈ will be 256 grams

∴32 × 8 = 256 grams

Therefore,

256gram of Sulphur needs 448 gram of Iron

So 16 gram of sulphur will  ?

cross multiply

The mass of Iron needed =( 16 × 448) ÷256

= 7168 ÷ 256

Hence by solving the above equation we can find the mass of iron which is 28 grams

To know more about chemical reaction visit:- https://brainly.com/question/11231920

#SPJ1

To calculate the standard Gibbs free energy change (ΔG°rxn) for the given reaction, we can use the equation:ΔG°rxn = ΔH°rxn - TΔS°rxn, Given: ΔH°f (kJ/mol) values:HNO3(aq): -207.0 kJ/mol, NO(g): 91.3 kJ/mol, NO2(g): 33.2 kJ/mol and H2O(l): -285.8 kJ/mol.

S° (J/mol∙K) values:

HNO3(aq): 146.0 J/mol∙K

NO(g): 210.8 J/mol∙K

NO2(g): 240.1 J/mol∙K

H2O(l): 70.0 J/mol∙K

Let's calculate the ΔH°rxn:

ΔH°rxn = [3 × ΔH°f(NO2(g))] + [ΔH°f(H2O(l))] - [2 × ΔH°f(HNO3(aq))] - [ΔH°f(NO(g))]

ΔH°rxn = [3 × 33.2 kJ/mol] + [-285.8 kJ/mol] - [2 × (-207.0 kJ/mol)] - [91.3 kJ/mol]

ΔH°rxn = 99.6 kJ/mol - 285.8 kJ/mol + 414.0 kJ/mol - 91.3 kJ/mol

ΔH°rxn = 136.5 kJ/mol

Calculate the ΔS°rxn:

ΔS°rxn = [3 × S°(NO2(g))] + [S°(H2O(l))] - [2 × S°(HNO3(aq))] - [S°(NO(g))]

ΔS°rxn = [3 × 240.1 J/mol∙K] + [70.0 J/mol∙K] - [2 × 146.0 J/mol∙K] - [210.8 J/mol∙K]

ΔS°rxn = 720.3 J/mol∙K + 70.0 J/mol∙K - 292.0 J/mol∙K - 210.8 J/mol∙K

ΔS°rxn = 287.5 J/mol∙K

Now, we can calculate ΔG°rxn using the equation:

ΔG°rxn = ΔH°rxn - TΔS°rxn

If we assume a standard temperature of 298 K, we can substitute the values: ΔG°rxn = 136.5 kJ/mol - (298 K * 0.2875 kJ/mol∙K)

ΔG°rxn = 136.5 kJ/mol - 85.57 kJ/mol

ΔG°rxn ≈ 50.93 kJ/mol

The calculated ΔG°rxn is positive (+50.93 kJ/mol). Therefore, based on the given options, the closest answer is: +50.8 kJ

Learn more about standard Gibbs free energy here ;

https://brainly.com/question/30654218

#SPJ11

Answer:

the second one

Explanation:

it makes the most sense

Answer: 2.22 moles

Explanation:

Molar mass

The molar mass of water, or H2O, can be found by adding the molar mass of two hydrogen atoms and the molar mass of one oxygen atom, which comes out to be 18.0 g/mol.

To find the moles in 40.0 grams of water, we will set up a proportion.

\(\frac{18.0 g}{1 mol} =\frac{40.0g}{xmol} \\\)

Then, we just solve for x.

\(18=\frac{40}{x} \\x=\frac{40}{18} \\x=2.22 mol\)

40.0 g of water is 2.22 moles.

Answer:

Sonoluminescence can occur when a sound wave of sufficient intensity induces a gaseous cavity within a liquid to collapse quickly. [...] The bubbles are very small when they emit the light—about 1 micrometer in diameter—depending on the ambient fluid (e.g., water) and the gas content of the bubble (e.g., atmospheric air).

Explanation:

Source is Google

There is a golden role of solubility, polar solute dissolve in polar solvent and non polar solute dissolve in non polar solvent. Therefore, it was unable to diffuse through the 20 MWCO membrane.

Solutions are a homogeneous mixture of two or more substances. A solution is a homogeneous mixture of solvent and solute molecules. Solvent is a substance that is in large amount in solution. solute is the substance which is in small amount in a solution. There are two types of mixture that is homogeneous and heterogeneous. Solution is a homogeneous solution.

Lee molecular weight of urea is 60.07 . It was unable to diffuse through the 20 MWCO membrane due to urea being unable to fit through the pores of the membrane.

Therefore, it was unable to diffuse through the 20 MWCO membrane.

To know more about solution, here:

https://brainly.com/question/13812915

#SPJ1

Answer:

Sodium

Formula : Na

Equivalent mass:23.0

Mark me as Branliest

Gas pressure can be described as the force exerted per unit area by gas molecules as they collide with the surface of a container. It is a measure of the average kinetic energy of the gas molecules.

For such more questions on Gas pressure

https://brainly.com/question/30235826

#SPJ8

Answer:

Mass = 80.6 g

Explanation:

Given data:

Mass of N₂ consumed = ?

Mass of CaCN₂ formed = 265 g

Solution:

Chemical equation:

CaC₂ + N₂      →       CaCN₂ + C

Number of moles of CaCN₂:

Number of moles = mass/molar mass

Number of moles = 265 g/ 92.11 g/mol

Number of moles = 2.88 mol

Now we will compare the moles of CaCN₂ and N₂.

                               CaCN₂            :            N₂

                                   1                   :              1

                                  2.88              :            2.88

Mass of N₂:

Mass = number of moles × molar mass

Mass = 2.88 mol × 28 g/mol

Mass = 80.6 g

The units of the rate constant (the rate = k[A]²[B]²) when the concentrations are measured in mol/L and the time in seconds are M³s⁻¹(option B)

The units of the rate constant can be determined by rearranging the rate law equation to solve for k:

k = rate / ([A]²[B]²)

Since the units of rate are mol/L·s and the units of concentration are mol/L, the units of k can be found by dividing the units of rate by the units of concentration squared:

k = (mol/L·s) / (mol/L)²k

= (mol/L·s) / (mol²/L²)k

= (mol/L·s) * (L²/mol²)k

= L²·s⁻¹·mol⁻²k

= M³s⁻¹

Therefore, the units of the rate constant when the concentrations are measured in mol/L and the time in seconds are M³s⁻¹ (option B)

Learn more about rate constant here: https://brainly.com/question/30645373

#SPJ11

Answer:

NaCl + Ag(NO₃) --> Na(NO₃) + AgCl

Explanation:

Chemical equation:

NaCl + Ag(NO₃) --> Na(NO₃) + AgCl

The given reaction represent the double displacement reaction. Anion and cation of both reactant exchange with each others.

The anion of sodium chloride(Cl⁻) combine with cation of silver nitrate Ag⁺ and  NO₃⁻ combine with Na⁺.

The third equation is correct while others are in correct.

Double replacement:

It is the reaction in which two compound exchange their ions and form new compounds.

AB + CD → AC +BD

SORRY CAUSE IDK IF THAT HELPED :(

Answer: 4P + 3O2 → P4O6

Explanation: plz give brainliest

Answer:

0J

Explanation:

The potential energy of the sitting puppy is 0J.

Since we have been given the mass of the puppy to be 3kg, to find the potential energy, we use the expression below:

 Potential energy  = mgh

m is the mass

g is the acceleration due to gravity

h is the height

 So the puppy is sitting on the grass, the height is 0m

Therefore, Potential energy is 0J

Answer:

D

Explanation:

it seems the most logical

Answer:

B

Explanation:

6.00 ml

PLEASE MARK AS BRAINLIEST

Hazardous materials are grouped into classes identifying their similarities in composition and structure.

The hazardous materials are grouped into classes in order to tell us about the severity of hazard and it is done on the basis of similarity in composition.

So we can conclude that hazardous materials are grouped into classes identifying their similarities in composition and structure.

Learn more about hazardous here: https://brainly.com/question/7310653

The symbol of the on obtained by removing two electrons from 63Cu is Cu^2+.

The atom is the smallest particle of  a substance that can take place in a chemical reaction. Now we know that the atom is composed of the protons, the electrons and the neutrons. The protons and the neutrons are found in the nucleus while the electrons are found in the orbits.

Now, for 63Cu,

The symbol of the on obtained by removing two electrons from 63Cu is Cu^2+. The isotope that contains 36 neutrons is 65Cu.

Learn more about isotope:https://brainly.com/question/11680817

#SPJ1

Answer:

Explanation:

In a nutshell, atoms decay because they're unstable and radioactive. Ununoctium (or Oganesson) has an atomic number of 118. That means that there are 118 protons in the nucleus of one atom of Oganesson, and that isn't including the number of neutrons in the nucleus.

Answer:

Atoms radioactively decay when a lower-energy nuclear configuration exists to which they can transition.

Explanation:

The actual decay event of an individual atom happens randomly and is not the result of the atom getting old or changing through time.

Answer:

being multiplied by x

Explanation:

I think,...

hope this helps :)

In a successful separation scheme, it is essential to separate solutions from solids before adding the next reagent, this is because each reagent serves a specific purpose in the process, targeting particular components within the mixture.

By separating the solution from the solid first, you ensure that the desired reaction occurs only with the components in the solution, allowing for an accurate and efficient separation process. Additionally, the presence of a solid in the solution can interfere with the intended reaction, potentially causing unwanted side reactions or hindering the efficiency of the process. In some cases, the solid may even react with the reagent, which could lead to false results or the formation of unwanted by-products

Moreover, keeping the solution clear of solids also simplifies the analysis and identification of separated components, this allows for a more precise determination of the separated components and a more effective overall separation process. In summary, separating solutions from solids before adding the next reagent is crucial for maintaining the accuracy, efficiency, and reliability of a separation scheme. This practice ensures that the desired reactions occur without interference, minimizes the potential for unwanted side reactions, and facilitates the analysis of the separated components.

Learn more about solution at:

https://brainly.com/question/29195815

#SPJ11

Answer:

An atom is a complex arrangement of negatively charged electrons arranged in defined shells about a positively charged nucleus. This nucleus contains most of the atom's mass and is composed of protons and neutrons (except for common hydrogen which has only one proton).

Answer:

Atoms consist of an extremely small, positively charged nucleus in which the protons and neutrons can be found, and is surrounded by a cloud of negatively charged electrons.

Answer:

Explanation:

Hope it helps

plz mark as brainliest!!!!!!

Of the following, which are not polyprotic acids? (select all that apply)
- HNO3
- НСІ


A polyprotic acid is an acid that has more than one acidic proton, which can be donated in a stepwise manner. Each proton is donated with a different acid dissociation constant (Ka) value.
Out of the given options, HNO3 and НСІ are not polyprotic acids. They both have only one acidic proton and can donate it in a single step.
H2SO4, on the other hand, is a polyprotic acid as it has two acidic protons, which are donated in two steps. The first dissociation of H2SO4 results in the formation of HSO4- ion, which is also an acid and can donate its proton to form SO42- ion.
НІ is also a polyprotic acid as it can donate its proton twice, resulting in the formation of I- and H2I+ ions.
In summary, the not polyprotic acids from the given options are HNO3 and НСІ.

These are monoprotic acids, meaning they can only donate one proton (H+) per molecule. On the other hand, H2SO4 (Sulfuric acid) is a polyprotic acid, as it can donate two protons (H+) per molecule.

To know more about polyprotic visit :-

https://brainly.com/question/29993754

#SPJ11

Answer:

21.504 liters

Explanation:

Given: 0.960 mol

Volume: ?

Molar Volume at STP = 22.4 liters

0.960 mol × 22.4 L/ 1 mol =

0.960 × 22.4 L = 21.504 L

Vinegar or acetic acid(CH3COOH) has intermolecular forces  of hydrogen bonding, dipole-dipole interactions and dispersion force.

Intermolecular forces can be defined as the attractive and repulsive forces that arise between the molecules of a substance.

Intermolecular forces includes the electromagnetic forces of attraction or repulsion which act between atoms and other types of its close particles such as atoms or ions.

Vinegar or acetic acid(CH3COOH) has intermolecular forces  of hydrogen bonding, dipole-dipole interactions and dispersion force.

Vinegar or acetic acid(CH3COOH)  has an especially strong type of hydrogen bonding. In solid state, the molecules in the acetic acid form cyclic pairs connected by hydrogen bonds. Thus, making it to have a low volatility.

Learn more about intermolecular forces at:

https://brainly.com/question/2193457

#SPJ1

The half life can be used to calculate the amount of the radioactive element remaining. From the calculations carried out, the age of the mineral is 2 * 10^7 years.

The half life of a radioactive element refers to the time taken for only about half of the number of radioactive atoms to remain.

Let us recall that there was no loss of atoms hence;

Number of Ut-189 atoms initially present =  150 + 50 = 200 atoms

Number of Ut-189 remaining after time t = 50 atoms

Half life of the mineral = 10 million years

Using;

N/No = (1/2)^t/t1/2

50/200 = (1/2)^t/1 * 10^7

1/4 =  (1/2)^t/1 * 10^7

(1/2)^2 =  (1/2)^t/1 * 10^7

2 = t/1 * 10^7

t = 2 * 1 * 10^7

t = 2 * 10^7 years

The age of the mineral is 2 * 10^7 years.

Learn more about half life: https://brainly.com/question/24710827

the circumference of the cake board is approximately 109.96 cm, which we can round off to 35 cm. To find the circumference of the cake board, follow these steps:

The diameter of the cake is 30 cm, and the cake board's diameter is 5 cm longer than that of the cake. So, the diameter of the cake board is 30 cm + 5 cm = 35 cm. To find the circumference of the cake board, use the formula C = πd, where C is the circumference and d is the diameter. In this case, the diameter (d) is 35 cm.

Substitute the value of the diameter into the formula: C = π(35 cm). Calculate the circumference: C ≈ 3.14 × 35 cm = 110 cm.

To know more about round off visit:

https://brainly.com/question/31900586

#SPJ11

correct form of question is

Explain the difference between Carbon-12 and Carbon-14. Which version Carbon do you believe is the most stable? Why? What information could help you confirm your prediction?

Answer:

Carbon has three isotopes those are carbon- 12 , carbon - 13 , carbon-14 among these only C-12 and C-13 are stable while C-14 is radioactive.

C-12 has 6 protons and 6 neutrons , C-14 has 6 protons and 8 neutrons. Atoms with equal number of protons and electrons are generally stable however C-12 and C-14 have 6 electrons but due to excess neutrons present in C-14 makes it undergo radioactivity therefore it is unstable.

The question requires us to calculate the amount of solution that could be prepared from 1.85 g of silver nitrate (AgNO3), considering a 5.0% solution.

Considering that 5.0% solution corresponds to a solution where there are 5g of AgNO3 in 100 g of solution (% m/m), we can write:

5.0 g of AgNO3 ---------- 100 g of solution

1.85 g of AgNO3 --------- x

Solving for x, we have that 37g of a 5.0% solution could be prepared from 1.85g of AgNO3.