You are asked to devise a procedure for quality control in a fertilizer plant to check that the nitrogen and phosphorus content is within a specified range. You decide on the outlined steps to monitor a production run of 1000 bags of fertilizer. A. A 50 g sample is removed from every 100th bag of fertilizer produced, resulting in ten 50 g samples. B. Samples 1, 3, 5, 7, and 9 are thoroughly mixed and a 50 g sample of the mixture is removed. C. Samples 2, 4, 6, 8 and 10 and the 50 g sample from the mixture are taken to the analytical laboratory. D. Each 50 g sample is separately dissolved in a fixed volume of water and the solution is filtered to determine the quantity of insoluble material. E. Separate aliquots of the water solutions are subjected to the procedures of phosphorus and nitrogen analysis.

Answer:

0.1935atm is the pressure of the gas.

Explanation:

In the problem you have the mass of Neon (You can obtain moles using molar mass), you have volume, and temperature. You can use general ideal gas law to solve pressure:

PV = nRT

P = nRT / V

Where P is pressure in atm, n are moles, R is gas constant (0.082atmL/molK), T is absolute temperature (20.0°C + 273.15 = 293.15K), and V is volume in L = Volume in dm³

Moles gas:

Molar mass Ne = 20.1797g/mol

0.325g * (1mol / 20.1797g) = 0.0161 moles

Replacing:

P = nRT / V

P = 0.0161 moles * 0.082atmL/molK * 293.15K / 2L

P = 0.1935atm is the pressure of the gas

Answer:

0.725 kg

Explanation:

Step 1: Given data

Step 2: Calculate the mass of the softball

We will use the following expression.

K = 1/2 × m × v²

m = 2 K / v²

m = 2 × 145 J / (20.0 m/s)²

m = 0.725 kg

The mass of the softball is 0.725 kg.

Answer:

Matter is classified into two broad categories, namely, pure substances and mixtures. Mixtures can be separated into pure substances by physical methods. Pure substances are further divided into categories as elements and compounds. ... A pure substance can be either an element or a compound.

Explanation:

Answer:

7.37. Oxygen for First Responders In self-contained breathing devices used by first responders, potassium superoxide, KO9, reacts with exhaled carbon dioxide to produce potassium carbonate and oxygen: 4 KO2s) 2 CO2g)2 K9CO3(s)+3 O2(g) How much O9 could be produced from 85g KOg?

Answer:

P + O2 --> P2O5

Explanation:

For a simple match burning you can use the following equation: P + O2 --> P2O5 To balance the reaction you have to make sure you have the same amount of each element on both sides.

Answer: atomic mass, atomic number

Explanation:

Answer:

its sodium hydroxide

Explanation:

Answer:

The products have more potential energy than the reactants in an endothermic reaction.

Explanation:

In an endothermic reaction, energy is absorbed, so the products have more potential energy that the reactants, like we can see in this drawing:

Answer:

you may proceed now

Answer what?? I don't see anything.

The best description of the relationship between population size, carrying capacity, and limiting factors is: "The size of a population usually stays near its carrying capacity due to limiting factors."

Carrying capacity refers to the maximum number of individuals that a particular environment can sustainably support. It represents the limit to which a population can grow given the available resources, such as food, water, and habitat. Limiting factors, on the other hand, are the factors that restrict population growth by reducing birth rates, increasing death rates, or limiting access to resources.As a population approaches its carrying capacity, limiting factors come into play and regulate the population size. These limiting factors can include competition for resources, predation, disease, availability of suitable habitat, and other environmental factors. They act as checks on population growth, preventing it from exceeding the carrying capacity of the ecosystem.

Therefore, the size of a population usually stays near its carrying capacity because the limiting factors ensure that the population does not exceed the available resources and ecological limits of the environment. If the population surpasses the carrying capacity, the limiting factors will intensify, causing a decline in resources and an increase in mortality rates, which ultimately brings the population back towards the carrying capacity.It's important to note that the relationship between population size, carrying capacity, and limiting factors is dynamic and can vary depending on various ecological and environmental factors.

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Explanation:

Using Ideal Gas Equation

PV=nRT

P = 15.7, V = 50L, T = 21 +273= 294K, n=?, R= 0.8206atmK^-1mol^-1

n = PV/RT = (15.7 × 50) / (0.8206 × 294) = 3.25mol

n = m/M, m=?, M= 16(2) = 32, n = 3.25

m = nM = 3.25 × 32 = 104g

104 grams of oxygen (O2) gas are there in a 50.0 L tank at 21.0c when the oxygen pressure is 15.7 atm.

Ideal gas is also called as real gas. The ideal gas equation is PV = nRT. Where, P is the pressure, V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature in Kelvin.

Ideal gas molecules do not attract or repel each other. The pressure of a gas times its volume same to the number of moles of the gas times a constant (R) times the temperature of the gas.

By using Ideal Gas Equation

PV = nRT

Pressure = 15.7,

Volume = 50L,

Temperature = 21 +273

= 294K,

n=?,

R= 0.8206atmK^-1mol^-1

n = PV/RT

= (15.7 × 50) / (0.8206 × 294)

= 3.25mol

n = m/M, m=?,

M= 16(2)

= 32, n = 3.25

m = nM

= 3.25 × 32 = 104g

Thus, 104g grams of oxygen (O2) gas are there in a 50.0 L tank at 21.0c when the oxygen pressure is 15.7 atm.

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Answer:

By size, Jupiter reigns supreme in our solar system. This gas giant has 11 times the diameter of Earth. Astronomers have spotted even larger gas giants, such as the exoplanet Kepler-7b, located 1,400 light years away from Earth.

In our solar system, Jupiter and Saturn are gas giants. These planets make Earth look tiny. The diameter of Jupiter is 11 times bigger than that of Earth, and Saturn’s is nine times bigger. Some people also include Uranus and Neptune in the gas giant category. They have a lot of hydrogen and helium in their atmospheres. But these planets also have water, methane and ammonia, and so NASA places them in their own group.

Astronomers have spotted gas giants outside our solar system. Like Jupiter and Saturn, they aren’t very dense. But they can be even bigger or hotter than our solar system’s gas giants.

Explanation:

Hope it helps

A brewed black tea generally has 81.30 milligrams of TA per 100 mL of water (which is to say it is at equilibrium). If a tea bag is steeped in 150. mL of water, 54.2 is the concentration of TA at equilibrium.

A substance's concentration is the amount of solute present in a given amount of solution. Molarity is the number of moles of solute in one liter of solution and is used to express concentrations.

Given:

M₁ = 81.30 milligrams

M₂ = ?

V₁ = 100ml

V₂ = 150ml

M₁V₁ = M₂V₂

By substituting given values in this equation and we get,

81.30 × 100 = M₂ × 150

M₂ = 81.30 × 100 / 150

= 54.2

Thus,  54.2 is the concentration of TA at equilibrium.

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Answer: The correct option is B.

Explanation:

The oxidation reaction is defined as the reaction in which a chemical species loses electrons in a chemical reaction.

A reduction reaction is defined as the reaction in which a chemical species gains electrons in a chemical reaction.

The chemical species will undergo a reduction reaction if the value of standard reduction potential is more positive or less negative.

For the given half-reactions:

\(Mg^{2+}+2e^-\rightarrow Mg(s);E^o_{Mg^{2+}/Mg}=-2.37V\)

\(Cu^{2+}(aq)+2e^-\rightarrow Cu(s);E^o_{Cu^{2+}/Cu}=+0.34V\)

As the value of standard reduction potential of copper is positive thus, it will undergo a reduction reaction and magnesium will undergo an oxidation reaction.

The half-reaction follows:

Oxidation half-reaction: \(Mg(s)\rightarrow Mg^{2+}(aq)+2e^-\)

Reduction half-reaction: \(Cu^{2+}(aq)+2e^-\rightarrow Cu(s)\)

Overall cell-reaction: \(Mg(s)+Cu^{3+}(aq)\rightarrow Mg^{2+}(aq)+Cu(s)\)

As it can be seen from the reaction that copper is forming as a pure metal in the product thus, it will be deposited and magnesium will be dissolved forming an aqueous solution.

Hence, the correct option is B.

Explanation:

Sulfur Reduction Balancing

QUESTION

You are given the equation S + NaOH Na₂S₂O3 + Na₂S +H₂O

i. Explain with electronic concept which substance is oxidised and which is reduced?

ii.Balance the equation by Ion electron or oxidation number method.

iii. Indicate the number of NaOH molecules used.

ANSWER

i. In this reaction, the sodium thiosulfate (Na₂S₂O₃) is being formed from the reaction between sodium hydroxide (NaOH) and sulfur (S). Since sodium thiosulfate has a lower oxidation state of sulfur than elemental sulfur, it can be inferred that sulfur has been reduced, meaning it has gained electrons. On the other hand, sodium hydroxide has not undergone any change in oxidation state, so it can be concluded that it is not oxidized or reduced in this reaction.

ii. To balance the equation using the oxidation number method, we first need to assign oxidation states to each element.

S + NaOH → Na₂S₂O₃ + Na₂S + H₂O

S: 0 → -2

Na: +1 → +1

O: -2 → -2

H: +1 → +1

Now we can see that sulfur has been reduced from 0 to -2, and the oxygen in thiosulfate (S₂O₃²⁻) has been oxidized from -2 to -1. We can balance the equation by adding electrons to the left-hand side to balance the reduction of sulfur and removing electrons from the right-hand side to balance the oxidation of oxygen.

S + 2NaOH + 2e⁻ → Na₂S + 2e⁻ + H₂O

S + 2NaOH → Na₂S + H₂O

S + 2NaOH → Na₂S₂O₃ + Na₂S + H₂O

2S + 4NaOH → Na₂S₂O₃ + 2Na₂S + 2H₂O

Therefore, the balanced equation is: 2S + 4NaOH → Na₂S₂O₃ + 2Na₂S + 2H₂O

iii. The equation indicates that 4 molecules of NaOH are used in the reaction.

Answer:

The ocean currents are too strong by the Amazon River to form deltas.

Explanation:

The Atlantic has sufficient wave and tidal energy to carry most of the Amazon's sediments out to sea, thus the Amazon does not form a true delta. The great deltas of the world are all in relatively protected bodies of water, while the Amazon empties directly into the turbulent Atlantic.

Answer:

We can simply refer to the cation in the ionic compound as magnesium. Phosphorus, Pstart text, P, end text, is a group 15 element and therefore forms 3- anions.

Explanation:

Because it is an anion, we add the suffix -ide to its name to get phosphide as the name of the ion.

At 2861 degree Celsius the iron begins to boil. At 1,538 °C the substance begins to melt.

The melting point is the point at which the liquid and solid forms of a solid can exist in equilibrium. It can also be defined as the point at which a solid changes into a liquid under normal atmospheric pressure.

The equilibrium point at which water vapor, liquid water, and solid ice can exist in equilibrium is the only point at which the pressure and temperature of water vapor are the same. The equilibrium point of water vapor is the point at which the partial vapor pressure is the same as that of liquid water at the exact temperature of 273.1600 K.

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From the solution that we have in the question;

The equilibrium constant, denoted as K, is a value that quantitatively represents the ratio of the concentrations of products to reactants at equilibrium in a chemical reaction.

It is a fundamental concept in chemical equilibrium.

The value of the equilibrium constant provides valuable information about the position of equilibrium and the relative concentrations of species involved in a chemical reaction.

Kc = [X] [Y]/[XY]

\(0.25 = (0.1 + x)^2/(0.5 - x)\)

\(0.25(0.5 - x) = (0.1 + x)^2\)

\(0.125 - 0.25x =0.01 + 0.2x + x^2\\ x^2 + 0.45x - 0.115 = 0\)

x = 0.18 M

The equilibrium amount of X and Y=  0.28 M and the equilibrium concentration of XY = 0.32 M

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Based on the answer to the question that we have;

The ratio of the product to reactant concentrations in a chemical reaction at equilibrium is represented quantitatively by the equilibrium constant, abbreviated as K.

It is a cornerstone of the theory of chemical equilibrium.

A chemical reaction's equilibrium position and the relative concentrations of the species involved can both be learned from the equilibrium constant's value.

Kc = [X][Y]/[XY]

\(0.25 = (0.1 + x)^2/(0.5 - x)\\0.25(0.5 - x) = (0.1 +x)^2\\0.125 - 0.25x = 0.01 +0.2x +x^2\\= 0.18 M\)

The equilibrium concentration of;

XY =0.5 - 0.18

=0.32 M

Then the equilibrium amount of

X and Y is

0.1 + 0.18= 0.28 M.

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Answer:

The pH at the midpoint in the titration of an acid with a base is

A) equal to the pK of the corresponding base.

B) equal to the pK of the corresponding acid.

C) equal to 14 minus the pK of the corresponding acid.

D) equal to 14 plus the pK of the corresponding base.

E) none of the above

Explanation:

When a weak acid is titrated with a strong base, then a buffer solution is formed.

pH of a buffer solution can be calculated by using the formula:

\(pH=pKa+log\frac{[salt]}{[acid]}\)

Exactly at the mid point,

[conjugate base of the salt]=[acid]

So, log [salt]/[acid] =0

Hence, pH of the solution will be equal to pKa of the weak acid.

Answer is option B.

Answer:

75g

Explanation:

n=Cmxv

=0,15x12,5

=1,875 mol

m=nxM

=1,875x40

=75g

If we add one or two hydrogen ions to a polyatomic ion that has a 3-charge, as the phosphate ion (PO₄3-), it will still be a polyatomic ion. (Three H+ would entirely cancel out the 3-charge, turning it into a neutral molecule and removing it from the category of polyatomic ions.

As a result, the carbonate ion has 2 more electrons than protons due to its negative charge. The doubly bonded oxygen in the carbonate ion is neutral, whereas each single bonded oxygen has a negative charge. This is the cause of the total charge of "-2," then.

An essential component of the atmosphere of stars like the Sun is the hydrogen anion.

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Answer:

N2H4 + 3O2 → 2NO2 + 2H2O

Explanation:

The electronegativity of the connecting atoms determines whether a bond is nonpolar or polar covalent.

What is electronegativity?

The tendency of an atom to draw electrons (or electron density) to itself is measured by its electronegativity. It controls the distribution of the shared electrons between the two atoms in a bond.

The bigger an atom's electronegativity, the more aggressively it will draw electrons from its bonds. The more electronegative atom is the one with the partial negative charge because electrons in a polar covalent connection are moved toward it.

The electron distribution will be more polarized and the atoms' partial charges will be larger the greater the difference in electronegativity.

Therefore, The electronegativity of the connecting atoms determines whether a bond is nonpolar or polar covalent.

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Answer:

We will not have a reaction.

Explanation:

The alcohol 2-methylhexan-2-ol its a tertiary alcohol. Additionally, the reaction of \(K_2Cr_2O_7\)  and acid medium will produce chromic acid \(H_2Cr_2O_7\)   with the following reaction:

\(K_2Cr_2O_7~+~2H^+->~H_2Cr_2O_7~+~2K^+\)

Chromic acid is a strong oxidant, so an oxidation-reduction reaction will take place. But, in this case. we have tertiary alcohol (see figure 1). Primary alcohols are oxidized to aldehydes and aldehydes are oxidized to carboxylic acids. Secondary alcohols are oxidized to ketones and tertiary alcohols can not be oxidized due to the lack of hydrogens on the carbon that is bonded to the "OH" group.

Therefore we will have no reaction.

I hope it helps!

Answer:

the paper clip is exactly 7.5 cm

A positively charged particle with mass 1.673 x 10-24 g is a(n) proton.

D.) Proton

Answer:

4

Explanation:

the significant figures are 2 1 0 0

Answer:

1.04 moles of AlCl₃

Explanation:

Balanced Equation:  2Al°(s) + 3Cl₂(g) => 2AlCl₃(s)

Approach => convert given data (28 g Al°) to moles. The number of moles  AlCl₃ would equal the number of moles aluminum because coefficients for Aluminum and Aluminum Chloride are equal.

moles Al° = (28g)/(27g/mole ) = 1.04 mole Al°

From balanced equation moles AlCl₃ produced equals moles of Al° produced = 1.04 mole AlCl₃ because coefficients of Al° & AlCl₃.