what are the respective concentrations (m) of k and po43- afforded by dissolving 0.800 mol k3po4 in water and diluting to 1.63 l? group of answer choices 0.800 and 0.491 0.489 and 0.163 0.491 and 0.491 0.800 and 0.800 1.44 and 0.491

Answer

To answer this question we need to use the following equation

P1/T1 = P2/T2

We can rearrange to make T1 subject of the formula as shown

T1 = (P1 x T2)/ P2

= (3.40 x 340)/ 5.90

= 195.9 K

Answer

find out the number of moles and use the molar ratio (numbers in front of formulas (in this case they are all 1) to determine how many moles of each product you are going to get theoretically

n=m/M is the equation to use to get moles here

30.8 gm/32.04 g/mol=0.9612 moles of the methanol and also of the formaldehyde so

0.9612 moles of the formaldehyde x molar mass (M) 30.73 g/mol= 29.54 gm which is the theoretical yield you already have the actual yield of 24.7 gm

then divide the actual by the theoretical to get the % yield which is 83.6%

Explanation:

The approximate amount of water used in the reaction is 1000 g. Student B is correct.

From the equation of the reaction, the mole ratio of the H2 produced and the H2O separated is 1:1.

mole of H2 produced = mass/molar mass

                                        = 112/2

                                           = 56 moles

This means that 56 moles of H2O was also separated.

Mass of 56 moles of H2O = 56 x 18

                                           = 1,008 g

Also from the equation of the reaction, the mole ratio of O2 produced to water separated is 1:2.

Mole of O2 produced = 888/32

                                       = 27.75 moles

Equivalent mole of H2O = 27.75 x 2

                                        = 55.5 moles

Mass of 55.5 moles of H2O = 55.5 x 18

                                               = 999 g

Thus, the approximate amount of water used in the reaction must have been 1000 g. Student B is correct.

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1. double replacement[two of the chemical species(B and D)exchanged positions]

2. Combustion(the reaction with oxygen produced CO2 and water; products of Combustion)

3. Single replacement(only one chemical specie[B] exchanged position)

4. Combination(the two reactants formed a single product)

5. Decomposition(a compound released two constituent products)

6. 1PbCl2 + 2AgNO3 = 1Pb(NO3)2 + 2AgCl. it is a double replacement reaction since two chemical species(Chlorine(Cl) and Nitrogen(iii)oxide[NO3]) exchanged positions.

7. 1NH3 + HCL = NH4Cl. it is a combination reaction since two reactants formed a single product.

8. 2AlCl3 + 3Na2SO4 = 1Al(SO4)3 + 6NaCl. it is a double replacement reaction since two chemical species(chlorine[Cl] and sulphate[SO4]) exchanged positions.

9. 1Zn + 1S = 1ZnS. it is a combination reaction since two reactants formed a single product.

10. 1Al2(SO4)3 + 3BACl2 = 3BASO4 + 2ALCL3. it is a double replacement reaction since two chemical species(chlorine[Cl] and sulphate[SO4]) exchanged positions.

11. 1Al2S3 = 2Al + 3S. it is a decomposition reaction since a reactant released two constituent products.

12. 1H2SO4 + 1Fe = 1H2 + 1FeSO4. it is a single replacement reaction since one chemical specie(sulphate[SO4]) exchanged position.

13. C12H22O11 + 12O2 = 12CO2 + 11H2O. it is a combustion reaction since a reactant combined with oxygen to release carbon dioxide(CO2) and water(H2O).

14. 1Mg(OH)2 + 1H2SO4 = 1MgSO4 + 2H2O. it is a double replacement reaction since two chemical species(hydroxide[OH] and sulphate[SO4]) exchanged positions.

15. 2NaOH + 1CuSO4 = Na2SO4 + Cu(OH)2. it is a double replacement reaction since two chemical species(hydroxide[OH] and sulphate[SO4]) exchanged positions.

16. 1C4H12 + 7O2 = 6H2O + 4CO2. it is a combustion reaction since a reactant combined with oxygen to release carbon dioxide(CO2) and water(H2O).

17. 4Fe + 3O2 = 2Fe2O3. it is a combination reaction since two reactants formed a single product.

18. 1Mg3(PO4)2 + 3H2 = 3Mg + 2H3PO4. it is a single replacement reaction since one chemical specie(phosphate[PO4]) exchanged position.

19. 2NH4NO3 = 2N2O + 4H2O. it is a decomposition reaction since a reactant released two constituent products.

20. 1Cl2 + 2KBr = 2KCl + 1Br2. it is a single replacement reaction since one chemical specie(potassium[K]) exchanged position.

The balanced hydrocarbon combustion reaction among the given options is D. C₃H₈ + 5 O₂ → 3 CO₂ + 4 H₂O.

Combustion reactions are chemical reactions that involve the reaction of a substance with oxygen gas to produce energy in the form of heat and light. In the combustion of hydrocarbons, the reactants are a hydrocarbon and oxygen gas, and the products are carbon dioxide and water.

To determine if a combustion reaction is balanced, we must ensure that the number of atoms of each element is the same on both sides of the equation. Option D is the only reaction that is balanced, as there are 3 carbon atoms, 8 hydrogen atoms, and 10 oxygen atoms on both sides of the equation.

Therefore, the correct answer is C₃H₈ + 5 O₂ → 3 CO₂ + 4 H₂O.

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When we bring a magnet near the doorbell when it is not connected to the battery, we feel a pull, or an attractive force.

For this the hypothesis can be:

Hypothesis: If there is no permanent magnet in the doorbell, just metal like iron, then when we bring a paper clip to the doorbell, we will observe an attractive force between the paper clip and the doorbell due to the interaction between the magnet and the iron in the doorbell.

Hypothesis: If there is a permanent magnet in the doorbell, then when we bring a paper clip to the doorbell, we will observe a stronger attractive force between the paper clip and the doorbell due to the interaction between the magnet and the metal components (such as iron) in the doorbell.

Thus, these can be the Hypothesis for the given scenario.

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Answer:

i am not sure but

Explanation:

b and c should be correct

Answer:b and D

Explanation:

Answer:

The Moon does not produce light; it is illuminated by the Sun. The fraction of the lit Moon that we view changes as the Moon orbits the Earth, giving rise to the Moon phases. A solar eclipse occurs when the Moon passes directly between the Earth and the Sun.

Answer:

agree that's why it's solid...

Answer:52!

Explanation:

The binding energy in an atom of ³He, which has a mass of 3.016030 atomic mass units (u), is approximately 193.0 MeV.

The binding energy of an atom refers to the energy required to disassemble the nucleus into its constituent nucleons (protons and neutrons). It represents the attractive forces that hold the nucleus together.

Mass of ³He (³He mass) = 3.016030 atomic mass units (u)

Sum of masses of constituents (protons and neutrons) = 2.808920 u

Binding energy (ΔE) = (³He mass) - (Sum of masses of constituents)

ΔE = 3.016030 u - 2.808920 u

ΔE ≈ 0.20711 u

To convert the binding energy from atomic mass units (u) to energy units such as electron volts (eV), we can use the conversion factor:

1 atomic mass unit (u) = 931.5 MeV

So, the binding energy can be calculated as:

Binding energy (ΔE) ≈ 0.20711 u * 931.5 MeV/u

Binding energy (ΔE) ≈ 193.0 MeV

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The expected product is (R)-2-bromobutane.

Stereochemistry plays a crucial role in determining the outcome of chemical reactions. In the given question, the stereochemistry of the intermediate I needs to be considered to determine the expected product.

The intermediate I indicates a chiral carbon center, denoted by an asterisk (*), which means it has four different substituents attached to it. This chiral carbon results in two possible stereoisomers: (R)-2-bromobutane and (S)-2-bromobutane.

When a reaction occurs at a chiral carbon, the stereochemistry of the reactant is usually retained in the product, assuming no racemization or inversion takes place during the reaction. In this case, the intermediate I has an (R) configuration, which implies that the product will also have an (R) configuration.

Therefore, the expected product is (R)-2-bromobutane.

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cellular respiration is a catabolic reaction that breaks down glucose and produces ATP.

cellular respiration is a vital process that occurs in cells to generate energy. It involves the breakdown of glucose and the production of ATP, which is used as an energy source by cells. In terms of the type of reaction, cellular respiration is classified as a catabolic reaction.

A catabolic reaction is one that breaks down complex molecules into simpler ones, releasing energy in the process. During cellular respiration, glucose is oxidized and broken down into carbon dioxide and water. This process releases energy that is captured in the form of ATP.

Overall, cellular respiration is essential for the survival and functioning of organisms as it provides the necessary energy for various cellular processes.

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Cellular respiration is a catabolic reaction.

Catabolism refers to the breakdown of complex molecules into simpler ones, usually accompanied by the release of energy. In the case of cellular respiration, the process involves the breakdown of glucose and other organic molecules to produce ATP (adenosine triphosphate), which is the main energy currency of cells. The overall reaction of cellular respiration can be summarized as:

Glucose + Oxygen → Carbon Dioxide + Water + ATP

This process occurs in multiple stages: glycolysis, the Krebs cycle (also known as the citric acid cycle or tricarboxylic acid cycle), and oxidative phosphorylation (which includes the electron transport chain). These steps involve the gradual breakdown of glucose and the transfer of high-energy electrons to ultimately generate ATP.

During cellular respiration, the energy stored in glucose is released, allowing the cell to perform various activities such as muscle contraction, active transport, and synthesis of molecules. The catabolic nature of cellular respiration is essential for providing cells with the energy required for their metabolic processes and overall functioning.

To summarize, cellular respiration is a catabolic reaction that breaks down glucose and other organic molecules to produce ATP and release energy for cellular activities.

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The net ionic equation for the behavior of ethylamine (C₂H₅NH₂) as a Bronsted-Lowry base in water is:

C₂H₅NH₂ + H₂O → C₂H₅NH₃⁺ + OH⁻

The net ionic equation for the behavior of benzoic acid (C₆H₅COOH) as a Bronsted-Lowry acid in water is:

C₆H₅COOH + H₂O → C₆H₅COO⁻ + H₃O⁺

In water, ethylamine (C₂H₅NH₂) can act as a Bronsted-Lowry base by accepting a proton (H⁺) from water. The reaction can be represented by the net ionic equation: C₂H₅NH₂ + H₂O → C₂H₅NH₃⁺ + OH⁻. In this equation, ethylamine (C₂H₅NH₂) accepts a proton from water (H₂O) to form the ethylammonium ion (C₂H₅NH₃⁺) and hydroxide ion (OH⁻). This shows the base behavior of ethylamine as it accepts a proton.

On the other hand, benzoic acid (C₆H₅COOH) can act as a Bronsted-Lowry acid in water by donating a proton (H⁺) to water. The reaction can be represented by the net ionic equation: C₆H₅COOH + H₂O → C₆H₅COO⁻ + H₃O⁺.

In this equation, benzoic acid (C₆H₅COOH) donates a proton to water (H₂O) to form the benzoate ion (C₆H₅COO⁻) and hydronium ion (H₃O⁺). This demonstrates the acid behavior of benzoic acid as it donates a proton.

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Answer:

Sewage pollutes our waters with pathogens, excess nutrients, heavy metals, and other toxins. It kills aquatic life and creates algal blooms that can suffocate fisheries. Sewage carries pathogens that can end up in our drinking water supplies and swimming areas.

Missing:

Explanation:

According to World Population Review 2022 the safest country to live are as follows.

These countries are listed safe by calculating global peace index.

This index measures the nation's and regions peacefulness and is finally reviewed by Institute of Economic and Peace (IEP).

The role of IEP is to measure peace at the worldwide and country level degree and lets us to evaluate the social, political and financial elements that create peace. Each year the Institute for Economics and Peace produces the Global Peace Index, the world’s main degree of countrywide peacefulness, rating 163 nations in line with their ranges of peace.

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Answer:

Explanation:

The kinetic energy of an object can be found by using the formula

\(k = \frac{1}{2} m {v}^{2} \\ \)

m is the mass

v is the velocity

We have

\(k = \frac{1}{2} \times 14 \times {7}^{2} \\ = 7 \times49 \\ = 343 \: \: \: \: \: \)

We have the final answer as

Hope this helps you

Answer:

Each element has its own unique properties. Each contains a different number of protons and neutrons, giving it its own atomic number and mass number. The atomic number of an element is equal to the number of protons that element contains. The mass number is the number of protons plus the number of neutrons of that element. Therefore, it is possible to determine the number of neutrons by subtracting the atomic number from the mass number.

Explanation:

Hope that helps you!

Each element has is own chemical and physical properties which make them unique and ideal for there uses.

Properties are defined as a characteristics of a particular substance that can observed in a chemical reaction.

There are mainly two types of properties

Both the chemical and physical properties are different for each elements and compounds.

Each elements has different number of protons and neutrons that contains its own atomic number and atomic mass

Thus, each element has is own chemical and physical properties which make them unique and ideal for there uses.

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According to the following reaction, the number of grams of copper(II) nitrate that will be formed upon the complete reaction of 25.4 grams of copper with excess silver nitrate is 74.9 grams.

Cu + 2AgNO3 → Cu(NO3)2 + 2Ag

Given that the amount of copper used in the reaction = 25.4 grams

We know that the molar mass of Cu = 63.55 g/mol.

So, the number of moles of copper = 25.4 g / 63.55 g/mol = 0.3996 mol

According to the balanced reaction equation, 1 mole of copper reacts with 2 moles of silver nitrate to form 1 mole of copper(II) nitrate. So, the number of moles of copper nitrate formed = 0.3996 × 1 / 2 = 0.1998 mol

The molar mass of Cu(NO3)2 = [63.55 + (2 × 14.01) + (6 × 16)] g/mol= 187.56 g/mol.

So, the number of grams of copper(II) nitrate formed from the given reaction = number of moles of Cu(NO3)2 × molar mass of Cu(NO3)2= 0.1998 mol × 187.56 g/mol= 37.47 g

The number of grams of copper(II) nitrate formed upon the complete reaction of 25.4 grams of copper with excess silver nitrate is 37.47 g, rounded to 2 decimal places.= 37.5 g.

Thus, the answer is 37.5 grams.

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Answer:

c

Explanation:

kenetic energy is energy an object has because it's in motion

B. They are vibrating slightly

Explanation:

This is because the particles are really close together and they vibrate on the spot.

Hope this is useful

The presence of a double or triple bond is the key structural feature that enables an organic molecule to serve as a monomer in addition polymerization.

An organic molecule that can serve as a monomer in addition polymerization needs to have a double bond (C=C) or a triple bond (C≡C) in its structure. The presence of these types of unsaturated bonds allows for the formation of covalent bonds between the monomers, leading to the formation of a polymer.

During addition polymerization, the double or triple bond of the monomer opens up and reacts with the double bond of another monomer, forming a covalent bond between them. This process continues, and a long chain polymer is formed. The type of polymer formed depends on the functional groups present in the monomer.

Therefore, the presence of a double or triple bond is the key structural feature that enables an organic molecule to serve as a monomer in addition polymerization.

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Answer:

The oxidation number of chlorine can be -1, 0, +1, +3, +4, +5, or +7, depending on the substance containing the chlorine. The most common oxidation numbers are -1 (as in HCl and NaCl ) and 0 (as in Cl2 )

Answer:

Depending on the chemical containing chlorine, the oxidation number can be -1, 0, +1, +3, +4, +5, or +7. The oxidation values -1 (as in HCl and NaCl) and 0 are the most prevalent (as in Cl2 )

Explanation:

Like charges repel while the unlike charges attract.

Electrostatics has to do with the interaction that does occur between charges. We know that a charge is a specie that has an imbalance in the number of electrons that it contains. The substance is positively charged if it contains less electrons and more protons. The substance is negatively charged if it contains more electrons and less of protons.

In either case, the interaction that exist between particles could be an attractive one or a repulsive one. It is regarded as the first law of electrostatics that like charges repel while the unlike charges attract.

Hence when we look at the table, a negative charge would repel another negative charge, a positive charge would repel another positive charge but a positive or a negative charge would attract a charge of opposite sign. The interaction that is possible between the charges is given by Coulombs law.

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Your image is saying "Can't load image on this device."

When refrigerant is in a high-pressure, high-temperature state, it enters the metering device. The refrigerant is then changed to a low-pressure, low-temperature state as a result of the metering device. As a result, the refrigerant will expand and the heat will be absorbed as the temperature decreases.

The metering device is a component in a refrigeration or air conditioning system that ensures that the correct amount of refrigerant is delivered to the evaporator. The device functions as a flow control, reducing the refrigerant's pressure before it reaches the evaporator. The metering device may be a simple capillary tube, an orifice, an automatic expansion valve (AEV), or a thermostatic expansion valve (TXV). The capillary tube is the simplest and least expensive metering device. It's just a small copper tube that's thin and long. The AEV is a constant pressure valve that maintains a consistent pressure drop across it, allowing it to regulate the refrigerant flow. A thermostatic expansion valve is the most sophisticated metering device, as it can sense the temperature at the evaporator outlet and adjust the refrigerant flow accordingly.

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The expression "minimum energy reactants need in order to start to react" accurately describes activation energy in a chemical reaction.

The expression that correctly describes activation energy in a chemical reaction is the minimum energy reactants need in order to start to react. Activation energy (Ea) represents the energy barrier that must be overcome for a chemical reaction to occur. It is the minimum amount of energy required for reactant molecules to reach the transition state, where old bonds are breaking and new bonds are forming.

In order for a chemical reaction to proceed, reactant molecules must acquire sufficient energy to surpass this energy barrier. The reactants need to collide with enough energy and in the proper orientation to initiate the reaction. The activation energy is specific to each chemical reaction and is determined by factors such as the nature of the reactants and the reaction mechanism.

The activation energy does not represent the total amount of energy consumed by the reaction, as reactions can involve energy changes in multiple steps. It also does not represent the energy given off when reactants collide, as collisions may not always lead to successful reactions.

Additionally, the activation energy is not equivalent to the heat released during the reaction, as heat is a thermodynamic quantity associated with the overall energy change of the reaction.

Therefore, the expression "minimum energy reactants need in order to start to react" accurately describes activation energy in a chemical reaction.

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