Initially a sample of nitrogen gas is found in a pressure of 4.62 atm under the temperature of 27.0°C

Answer: the best option to answer the question is the second one (or letter B), "2"

Explanation:

The question requires us to identify how many electrons a calcium (Ca) atom would lose to form an ion.

We can analyze the electron configuration of Ca to understand how many electrons it would lose.

The atomic number of Ca is 20, thus its electron configuration is as it follows:

From the electron configuration, we can see that Ca presents 2 electrons in its valence shell (4s2). To achieve stability, it is easier for Ca to lose these two electrons and form a Ca2+ ion.

Therefore, the best option to answer the question is the second one (or letter B), "2".

According to the Planck's equation,the energy and frequency of blue light are 4.699×10[tex]^-19[/tex] J and 2.363×10⁶ m[tex]^-1[/tex] respectively.

Max Planck discovered the theory which stated that energy is transferred in the form of discrete packs which are called quanta and thus proposed an equation called the Planck's equation which relates energy and frequency of a photon and is given as, E=hcυ or in terms of wavelength it is ,E=hc/λ.

The equation makes use of a constant which is called the Planck's constant and it's value is 6.626×10[tex]^-34[/tex] Js.

In the given problem, energy is calculated as,E=6.626×10[tex]^-34[/tex]×3×10⁸/4.23×10[tex]^-7[/tex]=4.699×10[tex]^-19[/tex] J.

The frequency  of light is calculated as follows,4.699×10[tex]^-19[/tex]/19.878×10[tex]^-26[/tex]=2.363×10⁶ m[tex]^-1[/tex].

Thus , the energy and frequency of blue light are  4.699×10[tex]^-19[/tex] J and 2.363×10⁶ m[tex]^-1[/tex] respectively.

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1) Subatomic particles. Atoms are made up of smaller parts called subatomic particles. Proton, neutron, and electron are some of them.

Electron: 9.11*10^-31 kg.

Proton: 1.672 18*10^-27 kg.

Neutron: 1.674 93*10^27 kg.

The lightest subatomic particle is the electron, then comes the protons, and finally the electron.

mL and cm³ have a 1 to 1 conversion, so we have:

But we don't have this option, so we will need to find another.

The other are in m³, so we can use the conversion from cm to m to get this:

So, we can apply this to what we have:

We have an option with 0.054m³, so the correc alternative is 0.054 m³.

Answer:

Explanation:

As the cell has a copper strip like the anode and a coin or nail (we can consider this like it is nickel) like the cathode, we can write both half-reactions:

• Copper half-reaction,:

In the copper anode, the oxidation reaction takes place. This is the positive terminal.

• Nickel half-reaction,:

In the nickel cathode, the reduction reaction takes place. This is the negative terminal.

The direction of the electron flow always go from the anode to the cathode.

1) Write the chemical equation.

2) List the elements in the reactants and in the products.

Reactants.

P: 4

O: 2

Products

P: 4

O: 10

Balance O.

3) Moles of O2 needed.

The molar ratio between P4 and O2 is 1 mol P4: 5 mol O2.

If 3.8 mol P4 are used, 19 mol O2 are needed.

.

STP stands for Standard Temperature and Pressure. Nowadays the STP is temperature of 0°C (273.15K) and pressure of 1 bar.

Assuming the gas behaves as an ideal gas, in these conditions the volume of each mol of gas is approximately 22.7 L.

Using rule of three, we can calculate the volume of 0.001 mol of H₂S:

Volume --- Number of moles

x --- 0.001 mol

22.7L --- 1 mol

So, the volume is approximately 0.0227 L.

Ethylmethylamine is a secondary amine, that has one ethyl group attached to the amine group and one methyl group, which is a also attached to the amine group.

It is represented by:

Nevertheless it can be represented by CH3CH2NHCH3.

It means that the correct answer is c. Both.

The balanced chemical equation for 0.1 M barium nitrate and 0.1 M sodium sulfate is -

2 Ba(NO₃)₂ + 2 Na₂SO₄   →   2 Ba(SO₄) + 2 NaNO₃

Balanced chemical equation are the equations having equal amount of reactants and the products formed. The reactants are placed on the left and products are placed on right forming a balanced chemical equation.

When 0.1 M barium nitrate reacts with the 0.1 M sodium sulfate, it gives an insoluble salt of barium sulfate and soluble salt of sodium nitrate as the product. This reaction is a type of precipitation reaction as precipitate is formed in the reaction. It is a double displacement reaction because the sulfate ions replace the nitrate ions to give the product.

Barium sulfate is known to be the most insoluble compound. It is formed as a precipitate.

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The molar mass of oxygen gas (O2) is 32.00 g/mol.

The molar mass of C3H8 is 44.1 g/mol.

This kind of reaction is a combustion:

C3H8 + 5O2 → 3CO2 + 4H2O (In a combustion we obtain CO2 and H2O. Don't forget to balance this equation)

Procedure:

Let's use stoichiometry to solve this

44.1 g C3H8 --------- 5 x 32.00 g O2

0.025 g C3H8 --------- X

X = 0.091 g O2

Answer: mass of O2 required = 0.091 g

To calculate the number of atoms of any compound it is necessary to use the Avogadro constant. This is a constant of proportion between the amount of matter and the number of entities that are linked to that amount. These entities can be atoms, molecules, ions, electrons, protons, neutrons. The value of the Avogrado constant is 6.022 x 10^23 mol^-1.

So to calculate the number of atoms in 275 grams of iron (III) hydroxide:

- First you need to transform grams into moles

- transform moles into atoms/molecule using Avogrado constant.

- To transform 275 grams of Fe(OH)₃ you need to use the molecular mass of Fe(OH)₃ and the following equation: mole = mass/molar mass

Molecular mass of Fe(OH)₃:

Fe - 55.85

O - 16

H - 1

(1x55.85) + (3x16) + (3x1) = 106.86 g/mol

Replace the value in the equation:

mole = 250/106.86

mole = 2.34 mole of Fe(OH)₃

- Now, let's solve the number of molecules of Fe(OH)₃ into 2.34 mole of Fe(OH)₃:

6.022 x 10^23 molecule --- 1 mol

x molecule ---- 2.34 mole

x = 1.41 x 10^24 molecules of Fe(OH)₃

Answer: There are 1.41 x 10^24 molecules of Fe(OH)₃

Answer:

C

Explanation:

Because the suspect touched something at the crime scene and thus he's fingerprint are matching

The carbonate ion has the simplest oxo carbon anion structure. One carbon atom is surrounded by three oxygen atoms in a trigonal planar arrangement, giving it D3h molecular symmetry. Its molecular mass is 60.01 g/ mol and its formal charge overall is HCO3.

Carbonate Organization its structure is a trigonal planar arrangement of three oxygen atoms surrounding a carbon atom. Two single bonds to the negative oxygen atom and two double bonds to the neutral oxygen atom make up the carbonate ion's Lewis structure.

The carbonate ion, a salt of carbonic acid, is the most basic form of the oxo carbon anion. A polyatomic ion, it has the chemical formula CO32-. The term "carbonate" can also refer to a carbonate ester, an organic molecule with the carbonate group C(=O)(O-)2.

The carbonate has a valency of two because it may combine with two hydrogen atoms.

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Given the hypothetical thermochemical equation, expressed as:

We are to find the enthalpy change (ΔH ) for the reaction 2C → 3 A + B.

• You can see that the, given reaction, 2C → 3 A + B is the, reverse ,of the thermochemical equation 3 A + B → 2 C.

• Since the ,reverse reaction is possible,, the reaction enthalpy has the ,same numerical value, but with the, ,opposite sign

Therefore, the enthalpy change ∆H, in kJ/mol, be for the reaction 2 C → 3 A + B is -65.5kJ/mol

ANSWER

3.52 moles are in 95 grams of aluminum

STEP-BY-STEP EXPLANATION:

As you can see from the question provided, you are asked to find the moles of aluminum

Given data

Mass of aluminum = 95 grams

To find the moles of aluminum, we will need to apply the below formula

From the question provided, you can see that the molar mass of aluminum was given

From your periodic table, you will see that the molar mass of aluminum is 27 g/mol

Molar mass of aluminum = 27g/mol

The next thing is to substitute the data given in the above formula

Therefore, we have 3.52 moles are in 95 grams of aluminum

Answer:

C = 9 mol

Explanation:

Reaction: A + 2B ---> C

We want to find the moles of C.

Given: moles of A = 9 mol.

To solve this problem we will need to use stoichiometry.

A is the limiting reagent because it has a coefficient of 1 and B has a coefficient of 2.

The molar ratio between A and C is 1:1 therefore for every 9 moles of A that react, 9 moles of C will be produced.

Explanation:

The [H₃O⁺] of a 0.150 M solution of benzoic acid is 0.00515 M.

Benzoic acid is classified as a weak acid and it dissociates partially when it is dissolved in water. Benzoic acid has chemical formula as C₆H₅COOH and it produce the benzoate anion which is [C₆H₅COO⁻] with a hydronium cation which is [H₃O⁻].

We know that constant Ka = 1.77 x 10⁻⁴

We will write the equilibrium reaction as -

C₆H₅COOH + H₂O    →    H₃O⁺ + C₆H₅COO⁻

0.150 M           x                 x              x

Ka = [H₃O⁺] [C₆H₅COO⁻]

             C₆H₅COOH

1.77 x 10⁻⁴ =    x₂    

                   0.150

We will solve to get the value of x -

x = [H₃O⁺] = 0.00515 M

Therefore, [H₃O⁺] is 0.00515 M.

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To see the total number of atoms we need to multiply coefficient which is written in foot of the molecule or element to the number that is written on the foot of that element

The balanced reaction is

2 Al(s) + 2 KOH(aq) + 4 H₂SO₄(aq) + 22 H₂O(l) → 2 KAl(SO₄)₂·12H₂O(s) + 3 H₂(g)

Balanced equation is the one in which the total number of atoms of a species on reactant side is equal to the total number of atoms on product side

The unbalanced equation is

Al(s) + KOH(aq) +  H₂SO₄(aq)→  KAl(SO₄)₂·12H₂O(s)

sulfur atoms on reactant side is 1 while on the product side it is 2 so multiply  H₂SO₄ by 2

Al(s) + KOH(aq) +  2H₂SO₄(aq)  →  KAl(SO₄)₂·12H₂O(s)

Now add    H₂O(l) and H₂(g) to balance oxygen and hydrogen. The balanced equation becomes

2 Al(s) + 2 KOH(aq) + 4 H₂SO₄(aq) + 22 H₂O(l) → 2 KAl(SO₄)₂·12H₂O(s) + 3 H₂(g)

Thus the balanced equation is

2 Al(s) + 2 KOH(aq) + 4 H₂SO₄(aq) + 22 H₂O(l) → 2 KAl(SO₄)₂·12H₂O(s) + 3 H₂(g)

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ANSWER

Energy is created ------ (option C)

EXPLANATION

During the chemical reaction process, reactants need to be converted to form products. To balance such chemical reaction equation, we need to apply the law of conservation of mass

Law of conservation of mass states that matter can neither be created nor destroyed but can be transformed from one form to another.

In the process ofa chemical reaction, bonds are broken are the reactants side, bonds are formed on the products side and mass is conserved

Therefore, the correct answer is Energy is created

The sum of coefficients when the above-mentioned equation is balanced is 12.

A chemical equation is a symbolic representation of a chemical reaction where reactants are represented on the left, and products on the right.

A chemical equation is said to be balanced when the number of atoms of each element on both sides of the equation is the same.

According to this question, calcium hydroxide reacts with phosphoric acid as follows:

3Ca(OH)₂ + 2H₃PO4 → Ca₃(PO4)₂ + 6H₂O

The sum of the coefficients of the above balanced chemical equation is 3 + 2 + 1 + 6 = 12.

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Explanation:

endothermic because absorbing

energy

H2O is absorbing heat to release hydrogen and oxygen gas. any reaction that requires energy from outside is endothermic.

In order to find the percent composition for Nitrogen in NH4NO3, we will need to work with all the masses from this compound, so let's list them below:

NH4NO3 = 80.04 g/mol

N = 14 grams, but we have 2 nitrogens, therefore = 28 grams

H = 1 gram, 4 Hydrogens = 4 grams

O = 16 grams, 3 Oxygens = 48 grams

Now we take the total mass of the compound as 100% and check how much it will be made by Nitrogen:

80.04 g = 100%

28 g = x %

x = 34.98%, which we can round up to 35% therefore the answer will be letter E

ANSWER

The original concentration of the solution is 0.147 mol

EXPLANATION

Given that;

The volume of water is 350.0mL

The volume of NaCl solution is 2.3L

The final concentration of the solution is 0.967M

To find the original concentration of the solution, follow the steps below

Step1: Write the dilution formula

Where

• M1 is the original concentration of the solution

• V1 is the original volume of the of the solution

• M2 is the final concentration of the solution

• V2 is the final volume of the solution

Step 2: Convert the volume of water to L

Recall, that 1mL is equivalent to 0.001L

Step 3; Find the original concentration of the solution by substituting by the given data into the formula in step 1

Hence, the original concentration of the solution is 0.147 mol

Explanation:

Titration is a technique used to determine the amount of matter in a sample using a solution of known concentration. In other words, titration is a quantitative chemical analysis. In this process, the sample has its concentration determined through a chemical reaction when it is mixed with another substance. The use of pH indicators in this process is useful to determine the endpoint of the titration, indicating that the entire sample has reacted. Titration is used to accurately determine the amount of a substance, confirm that the concentration described on the label is true or that the amount of a chemical compound is indicated on the package.

Sample weighing: With the solid sample on a watch glass, weigh it on the balance.

Sample dissolution: The sample is transferred to an Erlenmeyer flask with water, where dissolution takes place.

Problem solution: The solution is transferred to a volumetric flask and the volume is made up with water, creating the problem solution.

Aliquot transfer: Remove an aliquot of the problem solution with the aid of a pipette and transfer it to an Erlenmeyer flask.

Titration: To the Erlenmeyer flask, the problem solution (titrated) is added and the solution of known concentration (titrant) is inserted into the burette.

An acid-base indicator is also added to the titrator to indicate when the titration should be stopped due to the color change. The color change indicates the end point or turning point of the titration.

After that, when the color change persists, the volume of titrant used is verified and stoichiometric calculations will help us to discover the concentration of the titrated solution.

Answer:

Step 1 - Sample weighing: With the solid sample on a watch glass, weigh it on the balance.

Step 2 - Sample dissolution: The sample is transferred to an Erlenmeyer flask with water, where dissolution takes place.

Step 3 - Problem solution: The solution is transferred to a volumetric flask and the volume is made up with water, creating the problem solution.

Step 4 - Aliquot transfer: Remove an aliquot of the problem solution with the aid of a pipette and transfer it to an Erlenmeyer flask.

Step 5 - Titration: To the Erlenmeyer flask, the problem solution (titrated - basic solution) is added and the solution of known concentration (titrant - acidic solution) is inserted into the burette.

Step 6 - An acid-base indicator is also added to the titrator to indicate when the titration should be stopped due to the color change. The color change indicates the endpoint or turning point of the titration.

Step 7 - After that, when the color change persists, the volume of titrant used is verified and stoichiometric calculations will help us to discover the concentration of the titrated solution.

Answer:

The correct expression used for solubility is a. grams per 100 grams of solvent. One of the most commonly used methods for expressing the concentrations is molarity.

70.0 mL of water was added to 100.0 mL of 0.250 M CaCl₂ solution. Assuming the volumes are additive,  The CaCl₂ concentration in the diluted solution is 0.147 M.

given that :

volume V1 = 100 mL

volume V2 = 100 + 70 = 170 mL

Molarity M1 = 0.250 M

Molarity M2 = ?

using dilution equation we get :

M1 V1 = M2 V2

M2 = ( M1 V1) / V2

M2 = ( 0.250 × 100 ) / 170

M2 = 0.147 M

Therefore , the dilution solution will have 0.147 M

Thus, 70.0 mL of water was added to 100.0 mL of 0.250 M CaCl₂ solution. Assuming the volumes are additive, what is the CaCl₂ concentration in the diluted solution is 0.147 M.

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According to the explanation given in a previous session, the compounds that comes after the arrow are classified as product, and the compounds that comes before are classified as reactant, therefore in this reaction, (NH4)2CO3 is the product of the reaction, letter D

Some atoms are neutral and others have positive or negative charges.

The charged atoms are called "ions".

- If the ion has positive charge, it is called cation.

- If the ion has negative charge, it is called anion.

Ions can be identified by their charge, for example:

- Cations: Na^+1, K^+1, Mg^+2

- Anions: Cl^-1, Br^-1

Answer

Explanation

Given:

[KOH] = 0.01 M

What to find:

The hydroxyl concentration, [OH⁻¹].

Step-by-step solution:

pH or pOH is the measure of acidity or alkalinity of a solution.

Acids have pH ranging from 1 to 6.9 and bases have pH ranging from 7.1 to 14. Neutral substances have a pH of 7.

The dissociation of KOH in aqueous medium is:T