Pedro's book weighs 19/4 pounds. Blanca's book weighs 17/7 pounds. Use estimation to determine about how much more Perdro's book wweighs than Blanca's.

A 1lbs
Sorry I meant math.
B 2lbs

C 6lbs
D 7lbs

The net ionic equation focuses on the species that are directly involved in the reaction, highlighting the formation of solid calcium sulfate (CaSO4).

The reaction between sodium sulfate (Na2SO4) and calcium chloride (CaCl2) can be represented by the following balanced chemical equation:

Na2SO4(aq) + CaCl2(aq) → 2NaCl(aq) + CaSO4(s)

To write the complete ionic equation, we need to break down all the soluble compounds into their respective ions:

Na2SO4(aq): 2Na⁺(aq) + SO4²⁻(aq)

CaCl2(aq): Ca²⁺(aq) + 2Cl⁻(aq)

2NaCl(aq): 2Na⁺(aq) + 2Cl⁻(aq)

CaSO4(s): CaSO4(s)

By substituting the ions into the balanced chemical equation, the complete ionic equation is:

2Na⁺(aq) + SO4²⁻(aq) + Ca²⁺(aq) + 2Cl⁻(aq) → 2Na⁺(aq) + 2Cl⁻(aq) + CaSO4(s)

In the complete ionic equation, the ions that appear on both sides of the equation (Na⁺ and Cl⁻) are called spectator ions. They do not participate in the actual chemical reaction and can be eliminated from the equation. Simplifying the equation by removing the spectator ions gives the net ionic equation:

SO4²⁻(aq) + Ca²⁺(aq) → CaSO4(s)

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To solve this problem, we can use Henry's Law, which relates the solubility of a gas in a liquid to the partial pressure of the gas above the liquid. The equation for Henry's Law is:
C = kH*P
where C is the concentration (or solubility) of the gas in the liquid, kH is the Henry's Law constant, and P is the partial pressure of the gas.

We are given the Henry's Law constant for sulfur hexafluoride at 25 °C, which is 2.4×10−4 mol/(L⋅atm). We are also given the partial pressure of sulfur hexafluoride, which is 1.90 atm.
We can use these values to calculate the solubility of sulfur hexafluoride in water at 25 °C:
C = kH*P
C = (2.4×10−4 mol/(L⋅atm)) * (1.90 atm)
C = 4.56×10−4 mol/L

Therefore, the solubility of sulfur hexafluoride in water at 25 °C and a partial pressure of 1.90 atm is 4.56×10−4 mol/L.
The solubility of sulfur hexafluoride in water at 25°C and a partial pressure of 1.90 atm can be calculated using Henry's law constant, which is 2.4 × 10⁻⁴ mol/(L⋅atm). According to Henry's law, solubility = Henry's law constant × partial pressure. In this case, solubility = (2.4 × 10⁻⁴ mol/(L⋅atm)) × 1.90 atm. By calculating this, we get the solubility of sulfur hexafluoride in water at 25°C and 1.90 atm as 4.56 × 10⁻⁴ mol/L.

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Answer:

Diboron tetrachloride --->  B2Cl4

The overall heat transfer coefficient, U, is the sum of the individual heat transfer coefficients on the inner and outer surfaces of the pipe. To find U, we need to calculate the individual heat transfer coefficients and then sum them.

First, let's calculate the individual heat transfer coefficient on the inner surface of the pipe. We can use the convective heat transfer coefficient formula:

h_inner = 5680 W/m^2 K

Next, let's calculate the individual heat transfer coefficient on the outer surface of the pipe. Again, we can use the convective heat transfer coefficient formula:

h_outer = 22.7 W/m^2 K

Now, let's find the overall heat transfer coefficient, U:

U = (1 / h_inner + 1 / h_outer)^-1

Substituting the values we have:

U = (1 / 5680 + 1 / 22.7)^-1

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Answer:

Allows diffusion of sub...(true)

its found in both anim...(true)

produces en...(false)

The expression relating the concentration of a gas in \(\mu g/m^-^3 (X)\) with the concentration expressed in ppm (Y) is \(Y = (X/MW) * 10^6 / V\)

To derive an expression relating the concentration of a gas in \(\mu g/m^3 (X)\) with the concentration expressed in ppm (Y), we can use the ideal gas law. The ideal gas law states that \(PV = nRT\), where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature. Rearranging the equation, we have \(n = PV/RT\)

To convert the concentration from \(\mu g/m^-^3 (X)\) to moles (n), we divide X by the molecular weight (MW) of the gas. Thus, \(n = X/MW\)

Combining the two equations, we have \(X/MW = PV/RT\)

Since the concentration expressed in ppm (Y) is the same as the number of moles per million parts of air, we can write \(Y = n * 10^6 / V\)

Substituting \(n = X/MW\), we get \(Y = (X/MW) * 10^6 / V\)

Therefore, the expression relating the concentration of a gas in \(\mu g/m^3 (X)\) with the concentration expressed in ppm (Y) is:

\(Y = (X/MW) * 10^6 / V\)

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Complete question is:

Using the ideal Gas Law, derive an expression relating the concentration of a gas \(\mu_g^-^3 (X)\) with the concentration expressed in ppm (Y). (10 pts) Hint:- Ideal gas law \(PV= nRt -R = 0.0821 atm mol^-^1\)  −MW=X= molecular weight

Looking for evidence entails careful study. The answers to the question is below;

The crime that Mr. Fraser describes is drive-by killing.

The police select their suspect by the act of showing pictures to one of the teenagers and thereafter they the suspect out, the suspect the saw that shoot the father.

The fact was that there was no evidence since they did not find the gun and the car used in the crime was not identified. Even the suspect vehicle (shooter) was not identified also.

The approximate figure is about 252 out of 367 cases of wrongful conviction have been identified. That is 69% of DNA exonerations. Others about 250-285 cases.

The National Registry of Exonerations has stated that about 450 non-DNA-based exonerations  where there was eyewitness misidentification. That is about 3 quarters have eye witness testimonies.

Reconstructive memory is simply known as the act of remembering that involves the reproduction of an experience or event that is known to be partially stored in memory before.

Fraser challenged the judge to go out and inspect the crime scene themselves.

The outcome of the challenge was that the judge thereby granted the retrial for Francisco Carrillo and thus released him so he can prepare his defense before the prosecution day.

Mr. Fraser suggested that people learn to be more effective with how they handle things or situations so as to get the right evidence and also that people be more cautious about how true some eyewitness testimonies may be.

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Answer:

its c my guy

Explanation:

Answer:

the correct answer is A

Explanation:

Answer:

True

Explanation:

In 1911, astronomers Hertzsprung and Russell independently plotted the spectral class (temperature) against the luminosity (energy emited) for known stars. They discovered that the stars were grouped together in different regions on the graph. This graph is now known as the Hertzsprung- Russell Diagram (see attached image).

The HR diagram shows us that there are different types of stars and that stars evolve in different ways depending on their initial mass. This can tell us what reactions are occurring in the stars' cores.

Stars follow a distinct path as seen on the diagram, and evolve in the following ways:

- Main Sequence > red giant > planetary nebula > white dwarf

- Main Sequence > supergiant > supernova > blackhole/neutron star

- Main Sequence > white dwarf

Temperature: surface temperature of stars

Absolute magnitude: measure of the luminosity or brightness of a star

Luminosity: the relative magnitude, relative to the magnitude of our sun

Spectral Class: temperature group of stars. categorised into OBAFGKM. Stars on the left the the hottest.

Main Sequence: Majority of stars lie in the main sequence, including our sun. These stars are fusing hydrogen to helium in their cores.

Red giants/Super giants: consists of a small minority of stars found at the top right of the HR diagram. These are very large and luminous, but have a much cooler temperature.

White Dwarfs: consists of a majority of stars, found at the bottom left of the HR diagram. These have very low luminosity, despite relatively high surface temp. and undergo fusion. These will not evolve anymore and will continue until all energy is used up in its core, and die out.

Blue Giants: rare, short-lived stars, and very luminous, hot, bright, and massive. These are found in the top left of HR diagrams, and are fusing heavier elements in their cores. They don't last long and will quickly evolve into white dwarfs.

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The number of atoms in a solid disc of pure Yttrium can be calculated using the given information and the principles of density, volume, mole, and atomic weight. Let the diameter of the disc be represented by "dia," the thickness by "th," the atomic weight of Yttrium by "AW," and the density by "rho."

dia = 18 cm

th = 1.4 mm

AW = 88.9059 kg/mole

rho = 4470 g/cu cm

Find:

Number of atoms in the Yttrium disc (N)

Principles & Definitions:

Density (rho) = Mass / Volume

Volume of a disc = π * (dia/2)2 * th

Mole = Mass / Atomic weight

Avogadro's number = 6.0221E23 atoms/mole

Using the above principles and definitions, we can set up the following equations:

Equation 1: rho = Mass / (π * (dia/2)2 * th)

Equation 2: Mass = Mole * Atomic weight

Equation 3: Mole = N / Avogadro's number

Now, let's solve the system of equations algebraically:

Solve Equation 1 for Mass:

Mass = rho * (π * (dia/2)2 * th)

Substitute the value of Mass from Equation 2 into Equation 3:

rho * (π * (dia/2)2 * th) = (N / Avogadro's number) * Atomic weight

Solve for N:

N = (rho * (π * (dia/2)2 * th) * Avogadro's number) / Atomic weight

Using the given values and the calculated variables, we can substitute them into the equation to obtain the numerical value for the number of atoms in the Yttrium disc.

It's important to note that dimensional analysis should be used to check the correctness of the algebraic solution and ensure that the units are consistent throughout the calculations.

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Answer:

                      Energy

potential energy        kinetic energy

chemical energy         thermal energy

                                                                   joules

Explanation:

chemical energy is a type of potential energy or stored energy. Heat is a kinetic energy and energy is measured in joules.

The first box is energy. It can be divided into kinetic energy in one side and potential energy in the other side. Here, kinetic energy can be converted to the thermal energy and potential energy can be converted to chemical energy. They are measure in Joules.

Potential energy and kinetic energy are two forms of energy that are commonly encountered in physics.

Potential energy is energy that an object possesses due to its position, shape, or state. An object can store potential energy when it is moved away from its equilibrium position, such as when a spring is stretched or a book is lifted to a certain height above the ground.

The amount of potential energy an object has is proportional to its mass, height, and the strength of the force that is acting on it. The average kinetic energy of an object is called its thermal energy.

Therefore,  first box is energy. It can be divided into kinetic energy in one side and potential energy in the other side. Here, kinetic energy can be converted to the thermal energy and potential energy can be converted to chemical energy. They are measure in Joules.

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In the orbital diagram for sulfur with 16 electrons, the electrons are added to the atom one at a time according to the Aufbau principle and the Pauli exclusion principle. The last electron to occupy an orbital would be the one with the highest energy level.

In the case of sulfur, the electron configuration is 1s² 2s² 2p⁶ 3s² 3p⁴. This means that the last electron to occupy an orbital is in the 3p subshell. Specifically, it would be the sixth electron in the 3p subshell, as the 3p subshell can hold a maximum of six electrons.

Therefore, the last electron to occupy an orbital in sulfur's orbital diagram would be the sixth electron in the 3p subshell.

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Answer:

D is your Answer just did the  quiz

( date on bottom when I did the quiz)

Explanation:

3 - 24 - 2021

Answer: The amount of CO2 found in the atmosphere varies over the course of a year. Much of this variation happens because of the role of plants in the carbon cycle

The type of the ClF₃ molecule is the covalent compound. The Chlorine Trifluoride will represents the trigonal bipyramidal geometry.

The Chlorine Trifluoride that is ClF₃ represents the trigonal bipyramidal geometry. In the chlorine trifluoride compound, there are the three bond pairs of the electrons and the two lone pairs of the electrons around the central atom that is the chlorine atom. The total of the five pairs of the electrons represent the trigonal bipyramidal geometry.

The covalent compound is formed by the mutual sharing of the electrons. The chlorine atom will forms the three covalent bonds with the surrounding fluorine atoms in the stable state.

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The compound that will contain the most polar bond is D. chloroethane, H3CCH2Cl. This is because the bond between the carbon and chlorine atoms is more polar than the bonds between the carbon and hydrogen atoms in the other compounds. The polarity of a bond is determined by the difference in electronegativity between the atoms involved in the bond. Chlorine has a higher electronegativity than carbon, so the bond between them will be more polar. The other compounds listed have bonds between carbon and hydrogen atoms, which have a smaller difference in electronegativity and are therefore less polar.

Write a Balanced Equation for the decomposition

CaCO₃     →     CaO    +    CO₂

Find Moles of CO₂ Produced

Since the mole ratio of  CaCO₃  to CO₂ is 1 to 1,

the moles of CaCO₃ = moles of CO₂

moles of CaCO₃   = mass ÷ molar mass

                             = 300 g ÷ 100.087 g/mol

                             = 2.997 moles

∴ moles of CO₂ = 2.997 moles

Determine Mass of CO₂

Mass = moles × molar mass

         = 2.997 mol × 44.01 g/mol

         = 131.9 g

The amount of potassium iodide present in 275 mL of a 0.23 M solution is 13.32 grams.

To find the amount of potassium iodide present in the solution, we need to use the formula:

Molarity = moles of solute/ volume of solution in liters

We are given the volume of the solution as 275 mL, which is the same as 0.275 L. We are also given the molarity as 0.23 M.

Rearranging the formula, we get:

moles of solute = Molarity x volume of solution in liters

moles of solute = 0.23 M x 0.275 L

moles of solute = 0.06325 mol

Finally, we can convert moles to grams using the molar mass of potassium iodide, which is 166.0028 g/mol.

grams of potassium iodide = moles of solute x molar mass

grams of potassium iodide = 0.06325 mol x 166.0028 g/mol

grams of potassium iodide = 13.32 grams.

Therefore, there are 13.32 grams of potassium iodide present in 275 mL of a 0.23 M solution.

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Answer:

4 significant figures

Explanation:

505 has 3 significant figures

450.25 has 5 significant figures

First do simple subtraction

505 - 450.25 =54.75

And then evaluate any number that has significance or is important if the decimal were to be moved.

4 significant figures

Answer: 176 g N2O, 72 g H2O

Explanation:

1. 64g O2 * (1 mol O2)/(32 g O2) * (2 mol N2O)/(1 mol O2) * (44g N2O)/(1 mol N2O) = 176 g N2O

2. 32g CH4 * ( 1 mol CH4)/(16 g CH4) * (2 mol H2O)/(1 mol CH4) * (18 g H2O)/(1 mol H2O) = 72 g H2O

Answer:

The pricing strategy is an important element in setting up the selling price of a product.

Explanation:

The pricing strategy is an important consideration while fixing up the selling price of product manufactured. When setting up a selling price of a product, the companies set up product calculation. Businesses should decide the pricing strategy before they advertise the products to the customers.  

There are mainly 5 benefits to the businesses while doing a product calculation. They are:

--- Doing competition based pricing enables the company to compete with the rival companies product and is based on the market based study. Competition pricing is a useful tool for the retailers as well as the small businesses.

---  Doing a cost plus pricing helps the total cost of making the product and also an add up in the market in order to determine the pricing of the product.

--- Dynamic pricing :

    Dynamic pricing is a non static pricing. Dynamic pricing is an efficient method for the market based on the supply and demand.

--- Penetration pricing :

 Penetration pricing is used by the large companies which is used to capture the market share by the setting product prices at the below market level so as to gain customers.

--- Doing a research for the price skimming helps the company to set up the accurate price for the product rather than readjusting the prices of the product later on based on the demand and the supply.

Certain nitrogen atoms contain seven neutrons, whereas others contain eight. Such two varieties of nitrogen have the same isotopes.

The only element that may contain seven protons was nitrogen, having the atomic number 7. Each isotope of nitrogen was represented by the given arrangement. This atom, which has eight neutrons, corresponds to nitrogen-15.

Isotopes have atoms with the same amount of protons but differing numbers of neutrons. They varies in mass, which affects their physical characteristics even when they have nearly identical chemical properties.

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Answer:

It allows ethene molecules to join together to form a single product , so it is an example of an addition reaction . Poly(ethene) is an addition polymer .

A. the main group element with the valence electron configuration 3s23p1 is in the periodic group p- block element. it forms a monatomic ion with a charge of +3.

B. the main group element with the valence electron configuration 2s22p4 is in periodic group 4, p block element. it forms a monatomic ion with a charge of +4.

The periodic table, also known as the periodic table of the elements, is a rows and columns association of the chemical factors. it's miles widely used in chemistry, physics, and other sciences, and is typically visible as an icon of chemistry.

Periodic table, inside the full periodic desk of the factors, in chemistry, the organized array of all of the chemical factors in order of growing atomic wide variety—i.e., the whole wide variety of protons inside the atomic nucleus.

An atom includes a relevant nucleus which is surrounded by way of one or more negatively charged electrons. The nucleus is undoubtedly charged and consists of one or greater exceedingly heavy particles called protons and neutrons. Atoms are the primary building blocks of depend.

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