If you have 12.5 moles Cl2 (chlorine gas), how many Liters of Cl2 do you have, at STP?

Answer:

double displacement reaction

decomposition reaction

Answer:

17,c

18,b

Explanation:

decomposition reaction is when the substance or chemical decompose its form to other smaller pieces

Answer:

H2O + SO3 → H2SO4

this is the answer for

this question

The element is Neon
The protons is the same as the atomic number (10 protons)
The electrons are the same as the number of protons in a neutral atom (10 electrons)
The neutrons can be found by subtracting the protons from the atomic mass (22-10=12 neutrons)

Answer:

dipole-induced dipole forces

Explanation:

KI(aq) has potassium and iodine ions in water. Water is a polar molecule. So the type of force must be ion-dipole.

Answer:

A gas with a constant volume had an original pressure of 1150 torr and a temperature of 75.0 ℃. Pressure was decreased to 760 torr. What is the final temperature of the gas?a. -43.0 ℃b. 49.6 ℃c. 230 ℃d. -251 ℃

Answer:

\(\boxed{\small \sf \: Mass \: of \: H_2O =322.2 \: grams}\)

Explanation:

Given:

Mass of ferous (Fe) produced = 750 gram.

To find:

Mass of water produced= ?

Solution:

Molar mass of Fe is 55.84 gram/mol

Let's find out the number of moles of ferous produced.

\( \small \sf Number \: of \: moles = \frac{Given \: mass \: of \: substance }{Molar \: mass \: of \: substance} \)

Substituting the given data in above formula.

\( \small \sf Number \: of \: moles = \frac{750}{55.84} \)

\( \boxed{\small \sf Number \: of \: moles \: of \: Fe= 13.43 \: moles}\)

Now the given reaction is,

\(Fe_3O_4 + 4H_2 \rightarrow 3Fe + 4H_2O\)

now calculate the number of moles of H2O

\( \sf \: \frac{3}{4} = \frac{13.43}{x} \\ \sf x = \frac{13.43 \times 4}{3} \\ \sf x = 17.90 \: moles\)

\( \small \boxed{\sf number \: of \: moles \: of \: H_2O= 17.90 \: moles}\)

mass of one mole of H2O is 18 gram, so we can calculate mass of 17.90 moles.

\(\small \sf \: Mass \: of \: H_2O = 17.90 \times 18 \\ \boxed{\small \sf \: Mass \: of \: H_2O =322.2 \: grams}\)

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Answer:

\(Al^{3+}\)

Explanation:

Aluminum has 13 protons. When it loses electrons it becomes positive. So losing each electron adds +1 making the resulting ion \(Al^{3+}\)

Answer:

It's 1.0407 Kilograms of oxygen (O2) in that container

Explanation:

according to ideal gas law:

\(PV = nRT\)

P: pressure, V: volume, n: moles, R: gas constant = 0.0821, T: temperature in Kelvin

Temperature in Kelvin = Temperature in Celsius + 273
Gas constant (R) is changed by changing pressure units (while using atm,   R = 0.0821 atm•L/mol•K )

by substituting with given data:

\(15.7 * 50 = n*0.0821*(21+273)\)

\(n = \frac{50*15.7}{0.0821 * 294} = 32.522 mol\)

So, O2 mass (Molar mass of O2 = 32 g/mol) = 32.522 * 32 = 1040.709 grams = 1.0407 kilograms

The variable that is unknown until the experiment is performed is the dependent variable.

In a scientific experiment, variables are classified into two main categories: independent variables and dependent variables. The independent variable is the variable that is intentionally manipulated or changed by the experimenter. It is under the control of the experimenter and is deliberately altered to observe its effect on the dependent variable.

On the other hand, the dependent variable is the variable that is measured or observed as the outcome or response in the experiment. It is the variable that is expected to change in response to the manipulation of the independent variable. The value or behavior of the dependent variable depends on the value or behavior of the independent variable.

Typically, before conducting an experiment, researchers have a hypothesis or an expectation about how the independent variable will affect the dependent variable. However, the actual outcome or result of the experiment, which is observed through the measurement of the dependent variable, remains unknown until the experiment is performed.

The purpose of conducting the experiment is to gather empirical data and observe the changes in the dependent variable to analyze the relationship between the independent and dependent variables.

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Answer:

A- 3.0110 X 10^24

Explanation:

I took the quiz

The term mole concept is used here to determine the number of atoms of potassium. The number of atoms of potassium present in 195.49 grams is 3.011 × 10²⁴.

One mole of a substance is defined as that quantity of it which contains as many entities as there are atoms exactly in 12 g of carbon - 12. The formula used to calculate the number of moles is given as:

Number of moles of atoms (n) = Given mass / Gram atomic mass

The given mass of potassium =  195.49 g

The atomic mass of 'K' = 39.098 g

n = 195.49 / 39.098 = 5 mol

Number of atoms = Number of moles of atoms × 6.022 × 10²³

5 mol ×  6.022 × 10²³ = 3.011 × 10²⁴

Thus the number of atoms is 3.011 × 10²⁴ .

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Therefore, the free energy change when 1.76 moles of Fe2O3(s) react at standard conditions is -271.5 kJ/mol.

To calculate the free energy change when 1.76 moles of Fe2O3(s) react at standard conditions, we need to use the standard thermodynamic data at 298K. The standard thermodynamic data provides us with the standard free energy change of formation for each compound involved in the reaction.

Using the given reaction equation, we can write the overall reaction as:

3Fe2O3(s) + H2(g) → 2Fe3O4(s) + H2O(g)

Using the standard free energy change of formation values for each compound, we can calculate the standard free energy change of the reaction (ΔG°rxn) using the equation:

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

where Σn represents the sum of the stoichiometric coefficients of each compound.

At 298K, the standard free energy change of formation values for the compounds involved in the reaction are:

ΔG°f(Fe2O3) = -824.2 kJ/mol
ΔG°f(H2) = 0 kJ/mol
ΔG°f(Fe3O4) = -1118.5 kJ/mol
ΔG°f(H2O) = -237.2 kJ/mol

Plugging these values into the equation for ΔG°rxn, we get:

ΔG°rxn = (2 mol x (-1118.5 kJ/mol)) + (1 mol x (-237.2 kJ/mol)) - (3 mol x (-824.2 kJ/mol))
ΔG°rxn = -271.5 kJ/mol

Therefore, the free energy change when 1.76 moles of Fe2O3(s) react at standard conditions is -271.5 kJ/mol.

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6) Cobalt - [Ar] 3d⁷4s²

7) Silver -[Kr] 4d¹⁰5s¹

8) tellurium - [Kr] 4d¹⁰ 5s² 5p⁴

9) radium - Rn 7s²

10) lawrencium - [Rn] 5f¹⁴ 7s² 7p¹

11) 1s² 2s² 2p⁴ 3s² 3p⁶ 4s² 3d¹⁰4p⁶ 5s¹ - strontium

13) [Kr] 5s² 4d¹⁰ 5p³- antimony atom

14) [Xe] 6s² 4f¹⁴ 5d⁶ - Osmium

15)[Rn] 5f¹⁴ 7s² 7p¹ - Einsteinium

16) 1s² 2s² 2p⁴ 3s² 3p⁶ 4s² 4d¹⁰ 4p⁵ - Bromine

17) 1s² 2s² 2p6 3s² 3d⁵ - Chlorine

18) [Ra]7s²5f⁶ - Einsteinium

19) [Kr] 5s² 4d¹⁰ 5p⁵ - Tellurium

20) [Xe] - Xenon.

The shell number (n) is the first symbol used to represent an electron configuration, followed by the type of orbital and the superscript number of electrons in the orbital. Consider this: The periodic table shows that oxygen has eight electrons.

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Burning 3.2L of oxygen with methane produces 2 molecules of carbon dioxide.

The balanced chemical equation for the combustion reaction of methane with oxygen is CH4 + 2O2 → CO2 + 2H2O. From the equation, we can see that every one molecule of methane reacts with two molecules of oxygen to produce one molecule of carbon dioxide and two molecules of water.

Therefore, to determine the number of carbon dioxide molecules produced when 3.2L of oxygen is consumed, we need to first calculate how many molecules of methane were used.

Since the volume of oxygen is given, we can use the ideal gas law PV = nRT to calculate the number of moles of oxygen present in 3.2L at room temperature and pressure (RTP).

Using the molar ratio from the balanced equation, we can then calculate the number of moles of methane required to react with this amount of oxygen.

Finally, we can use the stoichiometry from the equation to determine the number of moles of carbon dioxide produced. Converting the result to number of molecules gives us 2 molecules of carbon dioxide, as indicated in the summary above.

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Answer:

About 0.0940 M.

Explanation:

Recall that NaOH is a strong base, so it dissociates completely into Na⁺ and OH⁻ ions. Because the acid is monoprotic, we can represent it with HA. Thus, the reaction between HA and NaOH is:

\(\displaystyle \text{HA}_\text{(aq)} + \text{OH}^-_\text{(aq)} \longrightarrow \text{H$_2$O}_\text{($\ell$)} + \text{A}^-_\text{(aq)}\)

Using the fact that it took 15.00 mL of NaOH to reach the endpoint, determine the number of HA that was reacted with:

\(\displaystyle \begin{aligned} 15.00\text{ mL} &\cdot \frac{0.125\text{ mol NaOH}}{1\text{ L}} \cdot \frac{1\text{ L}}{1000\text{ mL}} \\ \\ &\cdot \frac{1\text{ mol OH}^-}{1\text{ mol NaOH}} \cdot \frac{1\text{ mol HA}}{1\text{ mol OH}^-}\\ \\ & = 0.00188\text{ mol HA}\end{aligned}\)

Therefore, the molarity of the original solution was:

\(\displaystyle \left[ \text{HA}\right] = \frac{0.00188\text{ mol}}{20.00\text{ mL}} \cdot \frac{1000\text{ mL}}{1\text{ L}} = 0.0940\text{ M}\)

In conclusion, the molarity of the unknown acid is about 0.0940 M.

Answer:

B- Candle wax melts when it is heated.

The volume of hydrogen gas produced at 315 K and 1.25 atm when 3.50 grams of zinc reacts with excess HCl is 1.16 L.

The balanced chemical equation for the reaction between zinc and hydrochloric acid is:

\(Zn(s) + 2 HCl(aq) → H2(g) + ZnCl2(aq)\)

We need to find the volume of hydrogen gas produced at 315 K and 1.25 atm when 3.50 grams of zinc reacts with excess HCl.

First, we need to determine the number of moles of zinc used in the reaction. The molar mass of zinc is 65.38 g/mol, so:

n(Zn) = 3.50 g / 65.38 g/mol = 0.0536 mol

Since 1 mole of zinc reacts with 1 mole of hydrogen gas, the number of moles of hydrogen gas produced is also 0.0536 mol.

Using the ideal gas law, PV = nRT, we can calculate the volume of hydrogen gas produced. We are given the temperature (315 K) and the pressure (1.25 atm), and the gas constant R is 0.0821 L·atm/(mol·K).

Substituting the values into the equation, we get:

V = (nRT) / P

V = (0.0536 mol) x (0.0821 L·atm/(mol·K)) x (315 K) / (1.25 atm)

V = 1.16 L

Therefore, the volume of hydrogen gas produced at 315 K and 1.25 atm when 3.50 grams of zinc reacts with excess HCl is 1.16 L.

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The formula mass of potassium chlorate (\(KCIO_3\)) is 170.55 g/mol.

Add the atomic masses of all the atoms in the compound according to their respective subscripts in order to determine the formula mass, sometimes referred to as the molar mass or molecular weight, of a compound.

The periodic table lists the atomic masses of the elements. The atomic masses of the constituent components in potassium chlorate (\(KCIO_3\)) are as follows:

Potassium's (K) atomic weight is 39.10 g/mol.

Chlorine's (Cl) atomic weight is 35.45 g/mol.

Oxygen's atomic mass (O) is 16.0 g/mol.

Let's now compute the potassium chlorate (KCIO3) formula mass:

Formula mass = (K atomic mass) + (Cl atomic mass) + 3 x O atomic mass

= 39.10 g/mol + 35.45 g/mol + 3 x 16.00 g/mol

= 39.10 g/mol + 35.45 g/mol + 48.00 g/mol

= 122.55 g/mol + 48.00 g/mol

= 170.55 g/mol

Therefore, the formula mass of potassium chlorate (KCIO3) is 170.55 g/mol.

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A physical model of a crime scene is called  an animation

The evidence that crime scene investigators gather includes fingerprints, tyre tracks, hairs, fibres, blood, and other bodily fluids. The NIJ sponsors initiatives to enhance: Blood and other bodily fluids at the location were identified.

There are three different sorts of imprint evidence: bite marks, tool marks, and shoe and tyre prints. Each of these may employ one or more of the following collection strategies, such as taking photos, lifting objects with tape, or plaster-casting.

Physical evidence, also known as actual evidence or material evidence, is any tangible thing that is presented as evidence in a court case that has some connection to the issue that gave birth to the dispute.

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Answer:

The answer is O a reconstruction.

Explanation:

Got it right on the test.

The molar concentration of the solution containing 3.0 moles of NaCl in 325 milliliters of water is approximately 9.23 M.

To calculate the molar concentration of a solution, we use the formula:

Molar Concentration (M) = Moles of solute / Volume of solution (in liters)

In this case, we have 3.0 moles of NaCl and 325 milliliters of water. First, we need to convert the volume of the solution to liters by dividing it by 1000:

Volume of solution = 325 mL / 1000 = 0.325 L

Now we can substitute the values into the formula to calculate the molar concentration:

M = 3.0 moles / 0.325 L

M = 9.23 M

Therefore, the molar concentration of the solution containing 3.0 moles of NaCl in 325 milliliters of water is approximately 9.23 M.

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The amount of iodosalicylamide synthesized in the reaction performed by Edward by using 0.97 g of salicylamide will be about 2.87 grams.

Iodosalicylamide is synthesized by reacting salicylamide and sodium iodide in the presence of an oxidant. Iodosalicylamide is used as a reagent to detect the presence of oxidizing agents.

To find the mass of iodosalicylamide produced, we must first determine the limiting reagent for the reaction. The limiting reagent is the one that is consumed entirely, preventing the reaction from continuing even though the other reactants are present. The limiting reagent is the one that produces the least amount of product.

Moles of salicylamide:

moles = mass / molar mass = 0.97 g / 137.14 g/mol = 0.00708 moles

Moles of sodium iodide:

moles = mass / molar mass = 1.63 g / 149.89 g/mol = 0.0109 moles

Since iodosalicylamide is formed in a 1:1 ratio with the limiting reagent, sodium iodide, the limiting reagent is sodium iodide. Therefore, the theoretical yield of iodosalicylamide is the same as the moles of sodium iodide used.

Moles of iodosalicylamide = 0.0109 mol

Mass of iodosalicylamide = moles × molar mass = 0.0109 mol × 263.03 g/mol = 2.87 g

Therefore, the mass of iodosalicylamide that would be formed, assuming 100% yield, is 2.87 g, rounded to two decimal places.

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The correct formula for the compound copper I sulfate is Cu2SO4. Here's the explanation:Chemical formulas are used to express the chemical composition of compounds in a simple manner.

In these formulas, chemical symbols are employed to signify elements while subscripts are used to specify the number of atoms or ions of each element in the molecule.For example, the formula for water is H2O, which means that each water molecule contains two hydrogen atoms and one oxygen atom.

Copper I sulfate, like all other ionic compounds, has a formula that reflects its chemical composition. Copper I sulfate is formed by the combination of copper I ions (Cu+) and sulfate ions (SO42-).

The copper I ion has a charge of +1, while the sulfate ion has a charge of -2. As a result, in order to achieve electrical neutrality, two copper I ions must combine with one sulfate ion.To express the chemical composition of copper I sulfate in formula notation, we can use subscripts to indicate the number of atoms or ions of each element present in the molecule.Therefore, the formula for copper I sulfate is Cu2SO4.

The two copper I ions and one sulfate ion in the molecule are indicated by the subscripts 2 and 1, respectively.

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Answer:

S>0 contributes to spontaneity.

Explanation:

i just took the test on a pex :)

According to the law of thermodynamics, the relationship between entropy and the spontaneity of a reaction is S > 0.

Entropy is the total amount of energy in a closed system that is present there, but there are no uses for that energy. It is the unused energy for any work.

By the second law of thermodynamics, any spontaneous process results in an increase in the universe's overall entropy. The total of the entropy produced by the spontaneous process and the change in energy brought on by the heat flow is known as the net change in entropy of the system or S.

The reaction will be spontaneous if the delta G is negative. Delta G is the Gibbs free energy. So the entropy S will be greater that the reaction.

The Gibbs free energy equation is:

△G = △H − T△S

Thus, the relation is S > 0.

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Decomposition is a chemical reaction that breaks the reactant into two or more products. Moles of nitrogen gas \((\rm N_{2})\) in the cylinder is 1.63 moles.

The ideal gas equation states the relation of the hypothetical ideal gas according to the pressure, volume, temperature and moles of the gas. It is given by,

\(\rm PV = nRT\)

Where,

Pressure (P) = 2000 kPa

Volume (V) = 2L

Temperature (T) = 295 K

Gas constant (R)=  0.08206

Substituting values  in the equation:

\(\begin{aligned} \rm n &= \rm \dfrac{PV}{RT}\\\\&= \dfrac{2000 \times (\dfrac{1}{101.325}) \times 2}{0.08206 \times 295}\\\\&= 1.63\;\rm mol\end{aligned}\)

Therefore, 1.63 moles are produced.

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Answer:

1.63 moles.

Explanation:

a.) Trimming of polypeptide chains: Trimming of polypeptide chains, also known as proteolysis, involves the functional groups cleavage of peptide bonds in a protein molecule by proteolytic enzymes.

This process can alter the conformation of a protein by removing certain domains or changing the folding pattern. The resulting changes in the protein structure can affect its function or level of activity.b.) Removal and/or modification of the N-terminal amino acid: The N-terminal amino acid of a protein plays an important role in determining its stability, folding, and function. Modification or removal of this amino acid can alter the conformation of the protein and affect its activity. For example, acetylation of the N-terminal amino acid can stabilize the protein structure and enhance functional groups its function.c.) Modification of individual amino acids: The addition or removal of functional groups such as methyl, phosphate, or hydroxyl groups to individual amino acids in a protein can also alter its conformation and affect its activity. For example, phosphorylation of serine or threonine residues in a protein can change the protein's conformation, leading to changes in its activity or localization.

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Answer:

hi I believe the answer is (C)

Explanation:

I'm not 100%, sure if (C) is the right answer sorry I just have a feeling that's it (C) and also after I did a little tad bit of research but I'm sorry if it isn't right. ( well I'm going to go to sleep.,. I hope you get a good grade in your assignment:>)

The indication of blue color in pH paper means the solution is basic. And green colour represents a neutral solution. The [H+] indicates the hydrogen ion concentration of the solution.

pH of a solution is the measure of H+ ion concentration in a solution. This indicates the acidity or basicity of a  solution. Mathematically pH is the negative logarithm of H+ ion concentration.

A pH of 7 indicates the solution is neutral. A pH more than 7 is basic and the pH below 7 is acidic. Acidic solution gives red-yellow colour in pH scale in a range of 1- 6. The green colour indicates neutral pH of 7.Blue colour indicates basic solutions with a pH range of 8-14.

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