What are the oxidation numbers of K, Cl, and O in KClO,?
A. K = +2, Cl = +4 and 0 = -2
B. K= +1, Cl = +5 and 0 = -2
C. K = +3, Cl = +3 and 0 = -2
D. K = +1, C1 = -5 and 0 = -2
E. None of the Above

Answer:

i think a or b

Explanation:

Answer:

3m/s²

Explanation:

Force applied to an object can be calculated thus;

F = ma

Where;

F = force applied (Newtons)

m = mass of substance (kg)

a = acceleration (m/s²)

According to the information provided in this question, F = 12.0 newtons, m = 4.0 kg, a = ?

Derived from F = m.a

We have; a = F/m

a = 12/4

a = 3

The resultant acceleration of the object is 3m/s².

Answer:

There are four categories of byproduct material: Radioactive material that results from the fissioning, or splitting apart, of enriched uranium or plutonium in nuclear reactors. Examples include cobalt-60, cesium-137 and iridium-192. Tailings or waste produced by processing uranium or thorium from ore.

Approximately 1.693 grams of calcium will be produced when 4.7 grams of calcium chloride are completely used up in the reaction.

To determine the grams of calcium produced, we need to calculate the molar ratio between calcium chloride (CaCl2) and calcium (Ca) in the balanced chemical equation for the reaction. The balanced equation is:

2Al + 3CaCl2 → 3Ca + 2AlCl3

From the balanced equation, we can see that for every 3 moles of calcium chloride, 3 moles of calcium are produced. We need to convert the given mass of calcium chloride (4.7 grams) to moles using its molar mass.The molar mass of CaCl2 is calculated by adding the atomic masses of calcium (Ca) and chlorine (Cl). The atomic mass of calcium is 40.08 g/mol, and the atomic mass of chlorine is 35.45 g/mol.

Molar mass of CaCl2 = (40.08 g/mol) + 2(35.45 g/mol) = 110.98 g/mol

Now we can calculate the moles of calcium chloride:

Moles of CaCl2 = (mass of CaCl2) / (molar mass of CaCl2)

              = 4.7 g / 110.98 g/mol

              ≈ 0.0423 mol

Since the molar ratio between calcium chloride and calcium is 3:3, the moles of calcium produced will be equal to the moles of calcium chloride used.

Moles of Ca = 0.0423 mol

To convert moles of calcium to grams, we multiply by the molar mass of calcium:

Mass of Ca = (moles of Ca) × (molar mass of Ca)

          = 0.0423 mol × 40.08 g/mol

          ≈ 1.693 g

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The correct answer is D: 100kPa and 298 K.

The enthalpy of a system is a thermodynamic quantity which can be regarded as the total energy content of the system.

The enthalpy of a system is measured under standard conditions. The standard conditions include;

Hence, the standard temperature and pressure conditions enthalpy is usually measured under are 100kPa and 298 K.

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Answer:

physical

Explanation:

chemical changes are those in which a completely new substance is formed.

physical changes are those in which no new substance is formed.

Answer:

IUPAC name for Titin

Explanation:

The IUPAC name for Titin. This is the largest known protein and so has the longest chemical name. Written in full, it contains 189,819 letters.

The number of molecules in 10.0 gram of NaOH is 15 * 10²².

To solve this question, we need to understand some terms of mole concept,

Mole - It is the amount of substance containing same number of molecules or atoms as there are atoms in 12 gram of carbon-12 isotope.

Molecules - It is group of atoms bonded together, representing the smallest fundamental unit of a chemical compound taking part in chemical reaction.

Molecular weight - The sum of atomic masses of all atoms in molecules.

Avogadro number - It is the number of atoms, ions, electrons, molecules in one mole of substance. It is represented as NA.

NA = 6.0 * 10²³ (approx)

To calculate the number of molecules, we apply the formulae,

no. of molecules = moles * NA

moles = weight / molecular weight

moles = 10.0 / 40

          = 0.25

Substituting this value to calculate number of molecules,

no. of molecules = 0.25 * 6.0 * 10²³

                            = 15 * 10²²

Therefore the number of molecules of in 10.0 g of NaOH is 15 * 10²².

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Answer:

here are several resons that fossil foraminifera are especially valuable for determining the relative ages of marine rock layers. They have been around since the Cambrian, over 500 million years ago. They show fairly continuous evolutionary development, so different species are found at different times.

Petroleum, being a fossil fuel, is spread unevenly throughout the earth's crust. Hence, option d is the correct answer: spread unevenly, with some places having none.

The distribution of petroleum is largely dependent on the geological history of an area, with areas that were once under ancient oceans or lakes having a higher likelihood of containing petroleum deposits. This has led to countries such as Saudi Arabia, Venezuela, and Canada having large reserves of petroleum, while other regions such as Europe and Africa have smaller reserves or none at all. The uneven distribution of petroleum has significant economic and geopolitical implications, with countries that possess large reserves having greater global influence and wealth.

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The purpose of the brine wash is to reduce the amount of water in the organic solution.

Brine or high concentration of sodium chloride in water often finds application in industrial processes to remove impurities and other foreign and unwanted substances form the yields. It can easily remove the water due to its high affinity with water.

The same is achieved through high osmotic gradient formed by high concentration of solute particles in the brine, which causes flow of water thus drying up the organic solution.

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Here are the typical sections that you should include in your report:

Title Page - This page should contain the title of your experiment, your name, your instructor's name, and the date the experiment was conducted.

Introduction - In this section, you should provide some background information on pH and why it is important to measure it. You should also state the objectives of the experiment and describe the methodology you used.

Materials and Methods - This section should include a list of all the materials you used in the experiment, as well as a step-by-step description of the procedure you followed to measure pH. Be sure to include any safety precautions you took during the experiment.

Results - In this section, you should present the data you collected during the experiment. You should include tables, graphs, or figures to illustrate your results. You should also provide a written explanation of your findings.

Discussion - In this section, you should interpret your results and explain what they mean in terms of the objectives of the experiment. You should also discuss any sources of error that may have affected your results, and suggest ways to improve the experiment in the future.

Conclusion - In this section, you should summarize your findings and state whether or not your objectives were achieved.

References - This section should include a list of any sources you consulted during the experiment, such as textbooks, journal articles, or websites.

Appendices - This section should include any additional information that is relevant to the experiment but not included in the main body of the report, such as raw data, calculations, or photographs.

When writing your lab report, be sure to follow the formatting and citation guidelines provided by your instructor or department. You may also want to consult a scientific writing guide or other resources to help you write a clear and concise report.

\(\begin{align}\huge\colorbox{black}{\textcolor{yellow}{I hope this helps !}}\end{align}\)

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\(\textcolor{cyan}{\small\textit{If you have any further questions, feel free to ask!}}\)

The partial pressure of CO (P_CO) at equilibrium is approximately 6.47 atm. Hence option e) 6.5 atm is correct.

C(s) + CO₂(g) ⇌ 2CO(g)

Since C is a solid, we only consider the gaseous species for equilibrium calculations. The Kp expression for this reaction is:

Kp = (P_CO)² / (P_CO₂)

Given that Kp = 167.5 and P_CO₂ = 0.25 atm, we can now solve for P_CO:

167.5 = (P_CO)² / 0.25

Rearrange the equation and solve for P_CO:

(P_CO)² = 167.5 * 0.25

P_CO = √(41.875) ≈ 6.47 atm

Therefore, the partial pressure of CO (P_CO) at equilibrium is approximately 6.47 atm.

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Answer:

2.5M

Explanation:

Molarity is the measure of the molar concentration of a solution. It is calculated using the formula below:

Molarity = n/V

Where;

n = number of moles (mol)

V = volume (L)

According to the information about Calcium chloride (CaCl2) provided in this question;

n = 0.5moles

M = 0.20M

Molarity = 0.5/0.2

Molarity = 2.5M

Answer:

warm water holds the least amount of dissolved oxygen, so I would assume the answer would be D. a small pond could heat up easily. in addition, the water is calm and not moving in a pond

The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

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Answer: distance by time

20/2=10

Explanation:

To find the pH of the buffer, we need to use the Henderson-Hasselbalch equation:
\(pH = pKa + log([NH_{3} ]/[NH_{4} +])\)

where [\(NH_{3}\)] is the concentration of ammonia and\([NH_{4}+]\) is the concentration of ammonium.

First, we need to calculate the concentration of ammonium ion \((NH_{4} +)\)using the dissociation equilibrium of ammonium:
\(NH_{4}+ + H_{2}O = NH_{3} + H_{3} O+\)

The equilibrium constant for this reaction is:
\(Ka = [NH_{3}][H_{3}O+]/[NH_{4} +]\)

Since we know the pKa of ammonium (9.24), we can calculate the Ka:

\(Ka = 10^{-pKa} = 10^{-9.24} = 4.38 * 10^{-10}\)

Now, we can use the concentrations of\(NH_{4} +\)and \(NH_{3}\)given in the problem to calculate the concentration of \(H_{3}O+:\)
\(Ka = [NH_{3} ][H_{3} O+]/[NH_{4} +]\)
\(4.38 * 10^{-10} = (0.22-x)*/(0.25+x)\)

where x is the concentration of \(H_{3}O+\) in M.

Solving for x, we get:
\(x = 3.3 * 10^{-9}\) M

So, the concentration of \(H_{3}O+\) is \(3.3 * 10^{-9}\) M. Using this value and the concentrations of \(NH_{4}+\) and \(NH_{3}\), we can now calculate the pH of the buffer:

\(pH = pKa + log([NH_{3} ]/[NH_{4} +])\)
\(pH = 9.24 + log(0.22/0.25)\)
pH = 9.24 - 0.048
pH = 9.192

Therefore, the pH of the ammonia buffer solution is approximately 9.192.

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Answer:

\(0.30molNH_3\)

Explanation:

Hello there!

In this case, since the reaction for the formation of ammonia is:

\(3H_2+N_2\rightarrow 2NH_3\)

We can evidence the 1:2 mole ratio of nitrogen gas to ammonia; therefore, the appropriate stoichiometric setup for the calculation of the moles of the latter turns out to be:

\(0.15molN_2*\frac{2molNH_3}{1molN_2}\)

And the result is:

\(0.30molNH_3\)

Best regards!

4.2228 g of solid potassium sulfide should be added to make an aqueous solution of 0.180 M potassium sulfide for an experiment in lab, using a 300 ml volumetric flask.

The given molarity of the aqueous solution of potassium sulfide is 0.180 M and the volume of the solution is 300 mL. We are required to find out the amount of solid potassium sulfide required to make the solution.

The formula to calculate the number of moles is: Number of moles = Molarity x Volume (in liters) 1. Convert the volume into liters.300 mL = 0.3 L2. Substitute the given values in the above formula.Number of moles = 0.180 M x 0.3 LNumber of moles = 0.054 mol3. The molecular formula of potassium sulfide is K2S. It means there are two moles of K for one mole of K2S. Hence, we can calculate the moles of K.Number of moles of K = 2 x 0.054

Number of moles of K = 0.108 mol4. The molar mass of K is 39.1 g/mol. Hence, we can calculate the mass of K required to make 0.108 mol.Number of grams of K = Number of moles x Molar massNumber of grams of K = 0.108 mol x 39.1 g/mol

Number of grams of K = 4.2228 g. Hence, 4.2228 g of solid potassium sulfide should be added to make an aqueous solution of 0.180 M potassium sulfide for an experiment in lab, using a 300 ml volumetric flask.

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Answer:B- Leads

Explanation:

just did the quiz and got it right

Answer:

A. True

Explanation:

it is possible to identify a hair as originating from a particular body area, the regions of the body that are primarily used in forensic comparisons are the head and pubic areas.

Forensic = the application of scientific methods and techniques to natters investigation by a court of law.

During an investigation, hair samples are taken from either the head or pubic area of a victim. This statement is true.

A thorough search for facts, particularly those that are obscure or need to be sorted out in a complicated situation, is known as an investigation. An investigation's main objective is often to ascertain how or why something occurred. Investigations are frequently formal, official processes.

Establishing pertinent data to support or refute claims of fraud and corruption is the goal of an inquiry.

It takes subjective thought to develop justifiable justifications for beliefs. It is conceivably the most significant line of thought an investigator will follow. It is a way of thinking that is founded on the facts, information, and evidence the investigator has gathered throughout their inquiry.

Thus, During an investigation, hair samples are taken from either the head or pubic area of a victim.

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The outlet temperature of air is 139.4 degree C, the pressure of air is 4.97 atm, and the mass rate of condensate leaving the annulus is 0.00137 kg/s.

To solve this problem, we need to apply the conservation of energy and mass to the annulus. Assuming steady-state and neglecting kinetic and potential energy effects, the energy balance equation for the air can be written as:

m cp (Tm,0 - Tm,i) = Q

where m is the mass flow rate of air, cp is the specific heat capacity of air, Tm,i and Tm,0 are the inlet and outlet temperatures of air, and Q is the heat transfer rate from the steam to the air.

The heat transfer rate can be calculated using the heat transfer coefficient h and the temperature difference between the steam and the tube surface, which is maintained at T3:

Q = h π D L (T3 - Ts)

where D is the inner diameter of the tube and L is the length of the annulus. The heat transfer coefficient can be estimated using empirical correlations for flow over cylinders, such as Churchill and Bernstein's equation:

\(Nu = 0.3 + 0.62 Re^{0.5} Pr^{0.33} (1 + (0.4/Pr)^{0.67){^{0.25} (1 + (Re/282000)^{(0.625)}^{0.8}\)

h = k Nu / D

where Nu is the Nusselt number, Re is the Reynolds number, and Pr is the Prandtl number.

The mass balance equation for the condensate can be written as:

\(m_{cond} = π D L (p_{steam} - p_{air}) Mu / hfg\)

where m_cond is the mass rate of condensate leaving the annulus, p_steam and p_air are the steam and air pressures, and hfg is the latent heat of vaporization of the steam.

Substituting the given values into the equations and solving simultaneously, we obtain:

Re = p D_m / Mu = 1443

Nu = 2.42

h = 27.16 W/m^2 K

Q = 5839 W

Tm,0 = 139.4 degree C

po = 4.97 atm

m_cond = 0.00137 kg/s

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Answer:

The sun provides more than enough energy to meet the whole world's energy needs, and unlike fossil fuels, it won't run out anytime soon. As a renewable energy source, the only limitation of solar power is our ability to turn it into electricity in an efficient and cost-effective way.

Answer:

4is the answer

Explanation:

In order to produce 3250 kg of AlCl3, a volume of compressed HCl gas would be required at 3.71 atm and a temperature of 326K.

The molar mass of AlCl3 is 133.33 g/mol, and the reaction is Al + 3HCl --> AlCl3 + 3H2. The volume can be calculated using the ideal gas law, PV=nRT, where P is pressure, V is volume, n is the number of moles, R is the universal gas constant, and T is the temperature in Kelvin.

To find the number of moles, we can divide the mass of AlCl3 by its molar mass. The volume, then, can be calculated by rearranging the equation to V=(nRT)/P. Plugging in the given values, we get a volume of 474.2 L of HCl gas.

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