Which of the following sets of quantum numbers contains an error?Group of answer choices:n = 4, l = 3, ml = -2, ms = -1/2n = 2, l = 0, ml = +2, ms = -1/2n = 3, l = 2, ml = 0, ms = -1/2n = 3, l = 1, ml = +1, ms = +1/2n = 2, l = 1, ml = 0, ms = -1/2

The law the scientist used to predict that the product of the reaction would be 15.9 grams of copper sulfide is law of conservation of matter

The law of conservation of matter states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.

The above law suggest that the total mass of reactants must equal to the total mass of the product obtained in a chemical reaction.

With the above information, we can obtain the mass of Cu₂S as follow:

2Cu + S → Cu₂S

Mass of Cu + mass of S = Mass of Cu₂S

12.7 + 3.2 = Mass of Cu₂S

Mass of Cu₂S = 15.9 grams

Thus, from the above illustrations, we can conclude that the law the scientist used was the law of conservation of matter

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The SiCl4 molecules' bonds will be more polar.

In a molecule, the difference in electronegativity between the atoms engaged in a bond determines its polarity. Iodine is not as electronegative as chlorine. As a result, the electrons in the Si-Cl bond will be localized more close to the Cl, giving the bond its polarity. Iodine is less electronegative than chlorine, hence it won't produce a Si-I bond that is highly polarized.

Tetrachlorosilane, often known as silicon tetrachloride, is an inorganic chemical having the formula SiCl4. It is an air-fuming, colorless volatile liquid. High purity silicon and silica are made using it for industrial applications.

The chemical compound with the formula SiI4 is called silicon tetraiodide. It is a tetrahedral molecule with 2.432 Si-I bonds. The silicon amides with the formula Si(NR2)4 are precursors to SiI4. Additionally, it has attracted attention in the production and etching of silicon for microelectronics.

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Molarity is a way of expressing the concentration of a solute in a solution, it is expressed with the term M and can be described by the following equation:

Moles of solute = 0.450 mol

Lsolution= Liters of water+Liters of NaCl

We will assume in this case that the volume of NaCl is negligible compared to the volume of water. Therefore, the volume of the solution will be 145.0 mL or 0.1450L

We replace the known data:

Answer: The molarity of the NaCl solution is 3.1M

STEP-BY-STEP EXPLANATION:

Given information

From the given reaction, you will see that energy is added to the reactant side. This implies that the reaction is an endothermic reaction.

An endothermic reaction is a type of reaction in which heat is absorbed from the surroundings.

Recall, Le Chatelier's principle states that when external constraints such as (temperature, pressure, and concentration) are imposed in a chemical equilibrium system, the equilibrium shift so as to annul or neutralize the effect of the constraints

When temperature is

Answer

Mass of carbon = 4.069 g

Explanation

Given:

Number of atoms = 2.04x10^23 atoms

Required: Mass of carbon

Solution

Step 1: Find the number of moles of carbon

1 mole = 6.022x10^23 atoms

x moles = 2.04x10^23 atoms

Solve for x

x = (2.04x10^23 atoms x 1 mole)/6.022x10^23 atoms

x = 0.339 mol

Step 2: From the moles, calculate the mass of carbon

m = n x M where m is the mass, n is the moles and M is the molar mass of carbon

m = 0.339 mol x 12,011 g/mol

m = 4.069 g

The mass of lithium nitrate that needs to de dissolved in 30.0g of water in order to make 18% solution is 6.58 grams.

The Percentage Concentration of a solution is the calculation of concentration of an element in a solution using the masses of solute/solvent and solution. It can be defined by the formula:

=> Percentage = (Mass of solute/Mass of solution)*100

The density of water is 1 gm/cm³, so the mass of 30.0g of water is 30ml. 18% concentration is given. The formula for percentage of concentration is given as

Percentage = (Mass of solute/Mass of solution) × 100

Here, Mass of solute is m, Mass of solution is m+30, and percentage is 18, So we get

=> 18 = (mass of solute/Mass of solution) × 100

=> 18 = (m/m+30)*100

=> 18(m+30) = m

=> 18m + 540 = 100m

=> 82m = 540

=> m = 6.58

Hence, the mass of lithium nitrate dissolved in 30g water to make 18%  solution is 6.58g.

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1) Write the chemical equation.

2) List the known and unknown quantities.

Sample: 2.7 g CH4.

Temperature: 380 K.

Pressure: 1.5 atm.

3) Convert grams of CH4 to moles of CH4.

The molar mass of CH4 is 16.0425 g/mol.

4) Moles of H2O produced from 0.17 mol CH4.

The molar ratio between CH4 and H2O is 1 mol CH4: 2 mol H2O.

5) Volume of H2O produced in the reaction.

5.1- List the known and unknown quantities.

Moles: 0.34 mol H2O.

Temperature: 380 K.

Pressure: 1.5 atm.

Ideal gas constant: 0.082057 L * atm * K^(-1) * mol^(-1)

5.2- Set the equation.

5.3- Plug in the known values and solve for V (liters).

7.1 L H2O was produced from 2.7 g CH4 in the reaction.

Answer: the volume air necessary must be at 117.93 °C to float

Explanation:

The question requires us to determine the final temperature of air in order to float in a hot air baloon, given its initial temperature and volume and the volume necessary for the baloon to float.

The following information was provided by the question:

initial volume = V1 = 2.60x 10^6 L

initial temperature = T1 = 90 °C

final volume = V2 = 2.80x10^6 L

Considering that the pressure remains constant, we can apply Charle's Law, which matematically states the relationship between temperature and volume of a gas at constant pressure:

Rearranging the equation to calculate the final temperature, we'll have:

Note that the temperature must be used in Kelvin, as it refers to the absolute temperature of the gas. We can convert the initial temperature given from °C to K as:

And, applying the values provided by the question:

And we can conver this temperature from K to °C as:

Therefore, the volume air necessary must be at 117.93 °C to float.

A drop of water is denser than a ping-pong ball.

Usually, water is made of particles that are firmly pressed together. In differentiation, plastic (the material ping pong balls are made of) may be a lightweight fabric and the particles are not as firmly stuffed together.

The thickness of a ping pong ball is 0.0840 g/cm³, though water’s thickness is 997 kg/m³. Subsequently, ping pong balls aren’t about as thick as water and will continuously coast and surface greatly quickly.

The ping pong ball appears to oppose gravity and coast within the air.

Ping-pong balls drift within the water since they are amazingly lightweight, empty, and filled with air. Too, the water’s surface pressure makes it simple for the ping pong ball to drift.

In expansion, water is denser than ping pong balls, making them look for the most noteworthy point of water.

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105.987. First we have to find the atomic mass of each atom of the molecule Na = 22.98977, C = 12.011 and O = 15.999. Since we have two atoms of Na the atomic mass of Na need be multiplied by 2, in case of carbon is 1 and 3 for oxigen and add them all together. 2x(22.98977) +1x(12.011) + 3x(15.999) = 105.987

Answer:

8

Explanation:

All noble gases have 8 electrons in their outermost shell and are in an octet state.

INFORMATION:

We have the following options

g

L

s

And we must select the options that are SI units.

STEP BY STEP EXPLANATION:

The SI units are:

- For mass: Kg

- For volume: cm^3

- For time: s

- For length: m

Finally, we can see that from given options, s is the unique that belongs to the SI units.

ANSWER:

s

Explanation:

Iron (III) nitrate is a soluble salt. When dissolved in water it will dissociate into its ions: Iron (III) and nitrate.

Fe(NO₃)₃ (aq) ----> Fe³⁺ (aq) + 3 NO₃⁻ (aq)

Answer: Fe³⁺ and NO₃⁻.

First, find the molality of the solution.

Where k is the molal freezing point, which is 1.86 C/m for water.

The equilibrium constant Ka would be

Then, to find x.

Once we have x, we can obtain the constant Ka

Therefore, the constant Ka of the reaction is 1.6x10^-4.

Answer

Explanation

Part A

Given:

a) N₂ (g) + 3H₂ (g) -----> 2NH₃ (g)

[N₂ ]eq = 1.50 M, [H₂ ]eq = 2.00 M, [NH 3 ]eq = 0.01 M

Solution:

i. The equilibrium constant expression for the reaction is

The kind of bonds that can be formed between each of the atoms is;

The ionic bond is the kind of bond that is formed between two atoms in a compound when there is a complete transfer of electrons between the atoms in the compound.

A covalent bond is said to be formed between two atoms when there is a sharing of the electrons that can be found between two atoms. We know that a bond is ionic when the difference in the electronegativity of the atoms is high.

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Answer

D) CO₃²⁻, F⁻

Explanation

A Brønsted-Lowry acid is a compound that supplies a hydrogen ion in a reaction. A Brønsted-Lowry base, conversely, is a compound that accepts a hydrogen ion in a reaction. Thus, the Brønsted-Lowry definitions of an acid and a base focus on the movement of hydrogen ions in a reaction, rather than on the production of hydrogen ions and hydroxide ions in an aqueous solution.

HCO₃⁻ (aq) + F⁻ (aq) = CO₃²⁻ (aq) + HF (aq)

Therefore, in the reaction above, the species that is/are Bronsnsted-Lowry base(s) are CO₃²⁻ and F⁻

Thus, the correct answer is: D) CO₃²⁻, F⁻

ANSWER

Octyne

EXPLANATION

Generally, an organic compound that has triple bond is called alkyne

The general formula for alkyne compound is given below as

Where n is the number of carbon atom

Therefore, the answer is octyne

Energy of a photon is equal to 4.655 (4.44 + 0.08).

=0.135MeV=135KeV

Nature contains the radioactive element Ra-226. In 1898, Pierre and Marie Curie were working with uranium ore when they made the discovery of radium.

Uranium-238 undergoes radioactive decay, resulting in Ra-226.

A light paint was also created by combining radium-226 with fluorescent zinc sulfide. During and after World War I, this luminescent paint was employed to decorate watches, compasses, and other equipment.

High radium levels can result in cancer (particularly bone cancer), anemia, a blood issue, shattered teeth and cavities, and cataracts, growths in the eyes.

Some of these medical issues take years to manifest. The majority are brought on by gamma radiation, which can spread widely through the atmosphere.

The mineral uraninite contains the highest concentrations of radium 226 in nature, while it can be found in different proportions in almost all types of rocks and soils that contain naturally occurring uranium.

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The bottom of a muddy puddle breaks a ceramic plate Both are only physical changes. Option A.

Breaking a plate is a physical change because no new products are formed during the event. It cannot be called a chemical change because the chemical composition of the splinter is the same as sheet metal. Any physical change that involves a change of state is reversible. Other state changes include evaporative freezing and condensation. Dissolution is also a reversible physical change.

When water is added to a mixture of sand and salt a solution of dissolved salts is formed leaving the sand intact. This is the physical change in recovering salts and sands from solution by filtration and evaporation. Glass breakage is a physical change because the chemical composition of glass does not change when broken. Furthermore, broken glass can be melted back into its original shape.

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Answer:

2358

Explanation:

the whole answer is 2358.11

explanation - Visible light sits in the region with ultraviolet (UV) to the left of the spectrum.

see picture below :

• The picture shows exactly where the visible light is located in the electromagnetic spectrum .

• That is to the left of the ultraviolet radiation, and to the right of infrared (IR).

Answer:

Explanation:

Here, we want to get the maximum amount of ammonia that can be produced

From the question, we have it that:

1 mole nitrogen gave 2 moles ammonia

Thus:

4 mole nitrogen will give 8 moles ammonia

Furthermore:

3 moles of hydrogen gave 2 moles of ammonia

5 moles of hydrogen will give:

The maximum amount of ammonia that can be produced is thus 8.0 moles

The heat capacity corresponds to the energy needed to raise one degree of temperature for one gram of substance. That is, the greater the heat capacity, for the same mass, the greater the energy required to raise the temperature of the material.

Therefore, between the two metals with the same mass, the same initial temperature, and the same heat added, we can say that the one with the higher heat capacity will present a lower final temperature.

Answer: 324 cm³

Explanation: Volume is calculated by the formula LxWxH (length times width times height). In your problem, it would just me 12x3x9. After that, just add units. :)

Answer:

- The name for the potassium oxide's structure is ionic.

Properties:

- High melting point.

- Soluble in water.

Explanation:

- The ionic structure it is formed by a cation (atom with positive charge) and an anion (atom with negative charge). In this case, potassium is the cation and the oxigen is the anion.

- Since potassium oxide is an ionic compound, it has a high melting point, because of the strong bonds. Also, it is soluble in polar solvents, like water, because its ions generate polarity in the molecule.

Answer:

D

Explanation:

D. Since CO2 is the only product, all the oxygen has to be converted into the form of CO2.
Let's pretend for a minute that the equation is:
aC + 2O2 -> CO2 where a is a certain number.
There would be no way of balancing this equation because the amount of oxygen on the left would always be twice of that on the right.

A) The melting and boiling point of a compound depends on the elements, the bonds that form the molecule, and the geometry of the compound, so two compounds with a similar structure can have similar melting and boiling points.

Fluorethane has the molecular formula C2H5F, so poly(fluoroethane) may have a similar boiling point since its structure is similar.

B) This is because when a bond is formed, the chemical and physical properties of the compound change because there is a rearrangement of the electrons. So all the compounds that contain bromine will not have the same properties but it will depend on the elements with which they are linked and the type of link between them. If bromine bonds with an element with low electronegativity, such as a metal, for example, an ionic bond will be formed. This ionic bond with metal will give it different electrical properties and this compound can conduct electricity.

The standard electrode potential value of a cell can be calculated from the reduction potentials of the electrodes. The standard electrode potential  E⁰ of the voltaic cell with Ni electrode and iron electrode is 0.19 V.

The reduction potential of an electrode at standard conditions that is at 298 K and 1 bar pressure is called standard electrode potential.

There are two types of electrodes in a cell called cathode and anode. Cathode is the electrode at which reduction occur where as the electrode which undergo oxidation is called anode.

The standard electrode potential of a cell can be measured  as follows.

[tex]E^{0} _{cell} = E^{0} _{cathode} - E^{0} _{anode}[/tex]

Here, the anode is Fe electrode with a standard electrode potential  of -0.44 V and the anode is Ni electrode having -0.25 V reduction potential.

Thus the standard electrode potential of the voltaic cell can be calculated as follows:

[tex]E^{0} _{cell} = E^{0} _{Ni^{2+}/Ni} = E^{0} _{Fe/Fe^ {2+}}[/tex]

       = (-0.25 v) - (-0.44 v)

       = 0.19 V.

Hence, the standard electrode potential of the cell E⁰ containing Ni electrode and Fe electrode is 0.19 V.

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Taking into account definition of percent yield, the percent yield of sodium chloride is 38.11%.

In first place, the balanced reaction is:

HCl + NaOH → NaCl + H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The limiting reagent is one that is consumed first in its entirety, determining the maximum amount of product in the reaction.

To determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 36.45 grams of HCl reacts with 40 grams of NaOH, 2.6 grams of HCl reacts with how much mass of NaOH?

mass of NaOH= (2.6 grams of HCl× 40 grams of NaOH)÷ 36.45 grams of HCl

mass of NaOH= 2.85 grams

But 2.85 grams of NaOH are not available, 2.1 grams are available. Since you have less mass than you need to react with 2.6 grams of HCl, NaOH will be the limiting reagent.

The percent yield is the ratio of the actual return to the theoretical return.

The percent yield is calculated as the experimental yield divided by the theoretical yield multiplied by 100%:

percent yield= (actual yield÷ theoretical yield)×100%

where the theoretical yield is the amount of product acquired through the complete conversion of all reagents in the final product.

Considering the limiting reagent, the following rule of three can be applied: if by reaction stoichiometry 40 grams of NaOH form 58.45 grams of NaCl, 2.1 grams of NaOH form how much mass of NaCl?

mass of NaOH= (2.1 grams of NaOH× 58.45 grams of NaCl)÷ 40 grams of NaOH

mass of NaOH= 3.07 grams

Then, the theoretical yield of NaCl is 3.07 grams.

In this case, you know:

Replacing in the definition of percent yields:

percent yield= (1.17 grams÷ 3.07 grams)×100%

Solving:

percent yield= 38.11%

Finally, the percent yield for the reaction is 38.11%.

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