what is the molarity of an unknown solution of cu2 whose absorbance is 0.6?

The species  of  phosphorus that have the highest oxidation number are H₃PO₄, P₂O₅, PCl₅.

Oxidation number can be described as the oxidation state, which is the  total number of electrons  that can be gained or loose by an  atom so as to be able to  form a chemical bond with another atom.

It should be noted that The species  of  phosphorus that have the highest oxidation number are H₃PO₄, P₂O₅, PCl₅.

oxidation state which can be as well be described as the  oxidation number, serves as the  hypothetical charge that is been contained by an atom in a case where all the  bonds to different atoms were fully ionic.

This is the degree of oxidation of an atom  as regards the  chemical compound, hence  oxidation state may be positive, negative or zero.

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Answer:

What changes do metamorphic rocks undergo?

Metamorphism is the addition of heat and/or pressure to existing rocks, which causes them to change physically and/or chemically so that they become a new rock. Metamorphic rocks may change so much that they may not resemble the original rock.

Explanation:

What are 2 main factors that cause metamorphism in rocks?

The main factors that control metamorphic processes are:

The mineral composition of the parent rock.

The temperature at which metamorphism takes place.

The amount and type of pressure during metamorphism.

The types of fluids (mostly water) that are present during metamorphism.

The amount of time available for metamorphism.What are the 5 processes that affect rocks over time?

Several processes can turn one type of rock into another type of rock. The key processes of the rock cycle are crystallization, erosion and sedimentation, and metamorphism.

Answer:

solubility

Explanation:

solubility is a measure of how much a substance will dissolve in a solvent.

Answer:

See explanation

Explanation:

The phase changes of carbon dioxide is quite interesting. It is even more interesting that its phase change from gas to solid is dependent on pressure and temperature.

The triple point of CO2 is -56°C at 5.11 atm pressure. This implies that below 5.11 atm, liquid CO2 can not exist. In fact, at -78°C and 1 atm, CO2 is a solid.

Hence, when pressure increases from 1 atm to 10 atm at -40C, CO2 changes from liquid to gas.

Answer:

"They drink water when it is aivailable but can go weeks without it, they rely on morning dew and the water content of their food". they can use plants as resources to live.

To prepare a sample in a capillary tube for a melting point determination, gently tap the tube into the sample with the open end of the tube down. Continue tapping until the sample is a couple of millimeters high. Then, with the closed end of the tube down, tap the sample down slowly or drop the tube into a long tube to move the sample down faster. Finally, ensure you can see some or all the solids in the magnifier when placed in the melting point apparatus before turning on the heat.

A capillary tube is a thin glass tube with a narrow diameter that can be used for melting point determinations. Melting point determinations are a valuable tool for characterizing a substance. The steps to prepare a sample in a capillary tube for a melting point determination are as follows:

Tap the tube into the sample with the open end down. Continue tapping until the sample is a couple of millimeters high. Then, with the closed end of the tube, tap the sample down slowly or drop the tube into a long tube to move the sample down faster. Ensure you can see some or all the solids in the magnifier when placed in the melting point apparatus before turning on the heat.

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The order of strength of hydrogen bonds, dispersion forces, and dipole-dipole forces is as follows: Hydrogen bonding , Dipole-dipole interactions ,London dispersion forces.

Hydrogen bonding: Hydrogen bonding is the strongest type of intermolecular force. It occurs when a hydrogen atom is covalently bonded to a highly electronegative atom (such as nitrogen, oxygen, or fluorine) and is attracted to another highly electronegative atom in a nearby molecule. An example of a molecule that exhibits hydrogen bonding is water (H2O). Dipole-dipole interactions: Dipole-dipole interactions are slightly weaker than hydrogen bonding, but still stronger than London dispersion forces. They occur between molecules that have permanent dipoles, or regions of partial positive and negative charge. An example of a molecule that exhibits dipole-dipole interactions is acetone (CH3COCH3). London dispersion forces: London dispersion forces are the weakest type of intermolecular force. They are attractive forces that occur between all types of molecules and result from the temporary separation of charge that occurs as a result of the movement of electrons within a molecule. An example of a molecule that exhibits London dispersion forces is hexane (C6H14).

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Answer:

While the Affordable Care Act (ACA) has made health insurance more affordable for ... for the majority of Americans who have coverage through employer-based plans. ... Why Average Americans Cannot Afford Health Care ... Almost half of our nation's income goes to the top 10 percent of the population.

Explanation:

Here are three ideas based on affordability:

Public transportation

Meal planning and cooking at home

Renting textbooks

Public transportation: Using public transportation such as buses and trains can be a more affordable option compared to owning and maintaining a personal vehicle.

Meal planning and cooking at home: Eating out at restaurants or buying pre-made meals can be expensive, especially if done frequently. Planning meals ahead of time and cooking at home can be a more affordable option.

Renting textbooks: Instead of purchasing new textbooks for each class, consider renting textbooks for the duration of the semester. This can be a more affordable option than buying new textbooks, especially if the textbooks are only needed for a short period.

These ideas are generally less expensive because they involve reducing unnecessary expenses and finding more affordable alternatives. By using public transportation instead of owning a car, you can save on the cost of purchasing and maintaining a vehicle.

Similarly, by cooking at home and renting textbooks, you can avoid the cost of eating out at restaurants and buying new textbooks.

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Answer:

The independent variable: Diet

The dependent  variable: Rats' mass

Explanation:

The independent variable in an experiment is defined as the variable that can be changed or controlled to find its impact on the dependent variable. The dependent variable is defined as the variable that is influenced by the change in the independent variable.

In the given experiment diet is the independent variable as its quantity is changing in different weeks and affecting the mass of rats' and mass of rats' is the  dependent  variable as it is measured by the influence of diet.

Hence, the correct answer is:

The independent variable: Diet

The dependent  variable: Rats' mass

The independent variable is the diet while the dependent  variable is rats'

mass.

An independent variable in an experiment usually undergoes some changes

in order to measure the impact they have on the dependent variable. A

dependent variable as the name implies relies on changes in the

independent variable to measure it.

In this scenario, the measured changes in diet exerts a positive or negative  

effect on the mass of the rats which is why the diet is the independent

variable and the dependent variable is the rats' mass.

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Answer:

44.01

Explanation:

12.01 + 16.00 + 16.00 = 44.01

The molar solubility of barium fluoride in 0.25 M NaF at 25°C is 1.1 × 10^-3 M.

The solubility of barium fluoride (BaF2) in water at 25°C is given by the Ksp expression:

Ksp = [Ba2+][F-]^2

At equilibrium, the concentration of Ba2+ and F- ions in the solution are in equilibrium with the solid BaF2.

However, in the presence of sodium fluoride (NaF), the equilibrium is shifted to the left due to the common ion effect. This means that the concentration of fluoride ions (F-) in the solution is already high due to the presence of NaF, which reduces the solubility of BaF2.

The reaction between BaF2 and NaF can be written as:

BaF2 (s) ⇌ Ba2+ (aq) + 2F- (aq)

Let's assume that the molar solubility of BaF2 in the presence of NaF is x M. Then, the concentration of Ba2+ and F- ions in the solution will be x M and 2x M, respectively, based on the stoichiometry of the dissociation reaction.

The concentration of F- ions in the solution due to NaF is 0.25 M (the concentration of NaF). Therefore, the total concentration of F- ions in the solution will be 2x + 0.25 M.

Using the Ksp expression, we can write:

Ksp = [Ba2+][F-]^2

1.7 × 10^-6 = x(2x + 0.25)^2

Solving for x, we get:

x = 1.1 × 10^-3 M

Therefore, the molar solubility of BaF2 in 0.25 M NaF at 25°C is 1.1 × 10^-3 M.

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The sample of oxygen will occupy approximately 18.5 mL at -70 °C and the same pressure.

The force exerted by a gas on specific area is known as gas pressure..

As we know, (P₁ V₁) /(T₁) = (P₂V₂) /(T₂)

Given, P₁ is the initial pressure (452 torr); V₁ is initial volume (32.2 mL)

T₁ is initial temperature in Kelvin (30 °C + 273.15 = 303.15 K)

P₂ is final pressure (452 torr); V₂ is final volume (what we want to find)

T₂ is the final temperature in Kelvin (-70 °C + 273.15 = 203.15 K)

Now, V2 = (P₁ V₁ T₂) / (P2 T₁)

V₂ = (452 torr x 32.2 mL x 203.15 K) / (452 torr x 303.15 K)

V₂ ≈ 18.5 mL

Therefore, the sample of oxygen will occupy approximately 18.5 mL at -70 °C and the same pressure.

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In order to convert the moles of a substance to grams, you will need to multiply the mole value of the substance by its molar mass. More commonly written for this application as: where, is the molar mass of the substance.

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Percolation centrality is a network science measure that quantifies the relevance or centrality of a node in a network. It is based on the percolation idea.

which refers to the movement of a fluid (or information) through a porous media. Percolation centrality in the context of network centrality assesses the network's resilience to node removal and the extent to which nodes are linked to the rest of the network .Percolation centrality is a network science measure that quantifies the relevance or centrality of a node in a network. It is based on the percolation idea.  A node's centrality is measured by its involvement in aiding network percolation or information flow. It's frequently used to analyze complex systems including social networks, transportation networks, and biological networks.

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Answer: 7.81 mol HgO (How many moles of mercury(II) oxide, HgO, are needed to produce 125 g of oxygen, O2?)

Explanation:

The property that the compound SeO is likely to

exhibit is option A. acts as a strong electrolyte.

Selenium oxide (SeO) is a binary compound that contains both a metal (selenium) and a non-metal (oxygen) element. In general, binary compounds consisting of a metal and a non-metal tend to exhibit ionic bonding, which results in the compound acting as a strong electrolyte in solution. This means that the compound dissociates into ions in water and conducts electricity.

Therefore, the correct answer is as given above.It could then be concluded that the property that the compound SeO is likely to exhibit is option A. acts as a strong electrolyte.

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Answer: The molarity of final solution is 0.244 M.

Explanation:

Given: \(M_{1}\) = 1.00 M,       \(V_{1}\) = 0.305 L

\(M_{2}\) = ?,                \(V_{2}\) = 1.25 L

Formula used to calculate the molarity f resulting solution is as follows.

\(M_{1}V_{1} = M_{2}V_{2}\)

Substitute the values into above formula as follows.

\(M_{1}V_{1} = M_{2}V_{2}\\1.00 M \times 0.305 L = M_{2} \times 1.25 L\\M_{2} = \frac{1.00 M \times 0.305 L}{1.25 L}\\= 0.244 M\)

Thus, we can conclude that the molarity of final solution is 0.244 M.

Answer:1

Explanation:

A balanced equation obeys the law of conservation of mass which states that the number of reactants and products on both sides of the equation should be always equal.

An equation in which the number of atoms of each element in the chemical reaction and the total charge are found to be the same for both the reactants and products. The mass of the reactants is equal to the mass of products.

The following steps are used to balance the given equation.

Thus the balanced equation obtained is:

Mg (NO₃)₂ + 2HCl → 2HNO₃ + MgCl₂

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The property that indicates very strong intermolecular forces in a liquid is option (d) very low vapor pressure. A very low vapor pressure suggests that the liquid molecules have strong attractions for each other, resulting in a decreased tendency for individual molecules to escape the liquid phase and form a gas.

Intermolecular forces are the attractive forces between molecules in a substance. Strong intermolecular forces indicate a high degree of attraction between the molecules. Among the given options, a very low vapor pressure indicates very strong intermolecular forces.

Vapor pressure is the pressure exerted by the vapor (gas) phase of a substance in equilibrium with its liquid phase at a given temperature. In a substance with very strong intermolecular forces, the molecules are tightly held together, making it difficult for them to escape from the liquid phase and enter the gas phase. As a result, the vapor pressure is very low.

In contrast, substances with weaker intermolecular forces have higher vapor pressures because the molecules can more easily overcome the attractive forces and transition from the liquid to the gas phase.

Therefore, a very low vapor pressure is an indicator of very strong intermolecular forces in a liquid.

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Answer:

O low ionization energy and more than 4 valence electrons

Explanation:

please Mark as BRAINLIST answer

Elements that easily gain (steal) electrons tend to have low ionization energy and more than 4 valence electrons. Therefore, the correct option is option D.

The quantity of protons an element has defines it. An element's atoms all contain the same amount of protons, but its electron and neutron counts might vary. Ions are produced by altering the electron to proton ratio, whereas isotopes are produced by altering the neutron count.

118 known elements are present. A study is being done to create element 120.1. The periodic table will have to modified to include element 120 after it has been created and validated. Elements that easily gain (steal) electrons tend to have low ionization energy and more than 4 valence electrons.

Therefore, the correct option is option D.

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The final temperature of the two substances after they are allowed to reach thermal equilibrium will be closer to the initial temperature of substance B.

This is because the specific heat capacity of substance B is two times that of substance A, meaning it takes twice as much energy to change the temperature of substance B by one degree. Additionally, the mass of substance A is four times the mass of substance B, meaning it has more thermal energy to transfer to substance B.

When the two substances are brought together and allowed to reach thermal equilibrium, the thermal energy will transfer from the substance with the higher temperature to the substance with the lower temperature until they are at the same temperature. Since substance B has a higher specific heat capacity and a lower mass, it will require more thermal energy to reach the same temperature as substance A. Therefore, the final temperature of the two substances will be closer to the initial temperature of substance B.

In conclusion, the final temperature of the two substances after they are allowed to reach thermal equilibrium will be closer to the initial temperature of substance B due to its higher specific heat capacity and lower mass.

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The rate of reaction refers to how quickly or solwly a reaction occurs;

a) Both A and B are second order

b) The rate law of the reaction is R = k[A]^2 [B]^2

c)The rate constant is  5.21 * 10^5 mol-3L^3s-1.

The term rate of reaction refers to how quickly or slowly a reaction occurs.

a) To obtain the order with respect to A, we divide reaction (3) by (2) as follows;

5.01 * 10^-1/1.25 * 10^-1 = k[0.0070]^m [0.14]^n/k[0.0035]^m [0.14]^n

4 = 2^m

2^2 = 2^m

m =2

To obtain the order with respect to B, we divide reaction (2) by (1);

1.25 * 10^-1/3.13 * 10^-2 = k[0.0035]^m [0.014]^n/k[0.0035]^m [0.0070]^n

4 = 2^n

2^2 = 2^n

n = 2

b)The reaction is second order in both A and B hence the rate law is R = k[A]^2 [B]^2

c) We can obtain K using any of the reactions;

0.0313 molL-1s-1 = k[0.0035molL-1]^2 [0.0700molL-1]^2

k = 0.0313 molL-1s-1/[0.0035molL-1]^2 [0.0700molL-1]^2

k = 5.21 * 10^5 mol-3L^3s-1

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Answer:

X : 68 F

Y : 72 F

Explanation:

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(a) The reaction between SbCl5 and PCl5 results in the formation of a complex adduct, SbCl5PCl5. This is because both SbCl5 and PCl5 are Lewis acids and can accept a pair of electrons from Lewis bases.

In this case, PCl5 acts as a Lewis base and donates a pair of electrons to SbCl5, forming the adduct.

(b) The reaction between KF and AsF5 results in the formation of the salt KAsF6. This is because KF is a source of the fluoride ion (F-) and AsF5 is a source of the AsF6- ion. When KF and AsF5 are mixed, the fluoride ion and the AsF5 molecule combine to form the salt KAsF6.

(c) The reaction between NOF and SbF5 results in the formation of the ions SbF6- and NO+. This is because SbF5 is a Lewis acid and can accept a pair of electrons from NOF, which acts as a Lewis base. The resulting ion pair is soluble in polar solvents such as acetonitrile and is used as a source of SbF6-.

(d) The reaction between HF and SbF5 results in the formation of the salt H[SbF6]. This is because HF is a source of the H+ ion and SbF5 is a source of the SbF6- ion. When HF and SbF5 are mixed, the H+ ion and the SbF6- ion combine to form the salt H[SbF6]. The resulting salt is used as a strong superacid in organic chemistry.

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Answer:

an ice cube and paper cube with the same dimensions

Explanation:

an example is an ice cube and a cube with the same dimensions made of paper. these have the same volume, but different masses because the particles are packed differently and in different amounts.

The names of covalent compounds indicate the number of atoms present through the use of numerical prefixes. These prefixes specify the quantity of each element in the compound.

For example, the numerical prefix "di-" is used to indicate the presence of two atoms. Therefore, when a covalent compound has two atoms of an element, the prefix "di-" is added to the element's name in the compound's name.

To illustrate this, let's consider the compound carbon dioxide (CO2). In carbon dioxide, the element carbon is combined with two atoms of oxygen. The prefix "di-" is used before the name of the second element, oxygen, to indicate the presence of two oxygen atoms.

Another example is the compound dinitrogen tetroxide (N2O4). In this compound, two nitrogen atoms (indicated by the prefix "di-") are combined with four oxygen atoms. The prefix "tetra-" is used to specify the presence of four oxygen atoms.

Here are some common numerical prefixes used in covalent compound naming:

Mono-: Indicates the presence of one atom.

Di-: Indicates the presence of two atoms.

Tri-: Indicates the presence of three atoms.

Tetra-: Indicates the presence of four atoms.

Penta-: Indicates the presence of five atoms.

Hexa-: Indicates the presence of six atoms.

Hepta-: Indicates the presence of seven atoms.

Octa-: Indicates the presence of eight atoms.

Nona-: Indicates the presence of nine atoms.

Deca-: Indicates the presence of ten atoms.

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The spontaneity of a reaction is determined by the Gibbs free energy change (∆G), which is a measure of the system's ability to do work.

The equation that links ∆G, ∆H, and ∆S is: ∆G = ∆H - T∆S, where T is the temperature in Kelvin and ∆H and ∆S are the enthalpy and entropy changes, respectively. The signs of ∆H and ∆S determine whether the reaction is exothermic or endothermic and whether it is entropy-driven or enthalpy-driven, respectively.

If ∆G is negative, the reaction is spontaneous, meaning it occurs without the input of energy.The given reaction has a ∆H of 23.25 kJ and a ∆S of 161.26 J/mol∙K.

First, we need to convert the units of ∆S from J/mol∙K to kJ/mol∙K by dividing by 1000.∆S = 161.26 J/mol∙K ÷ 1000 = 0.16126 kJ/mol∙K Substitute the values into the equation to determine the spontaneity of the reaction:

∆G = ∆H - T∆S∆G = (23.25 kJ) - (298 K) x (0.16126 kJ/mol∙K)∆G = 23.25 kJ - 48.02 kJ∆G = -24.77 kJ Since ∆G is negative, the reaction is spontaneous.

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