what is the equilibrium constant for a reaction at 25 °c? δg° for the reaction is 2.8 kj/mol.

Answer:

The post-transition metals cluster to the lower left of this line. Metalloids: The metalloids are boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te) and polonium (Po). They form the staircase that represents the gradual transition from metals to nonmetals.

Explanation: i googled it

The metal that is grouped with metalloids are

A metalloid is a type of element which possesses the characteristics of both the metals and the non-metals.

Metals are those elements that are good conductors of heat and electricity while non-metals are those elements that neither conducts heat nor electricity.

The characteristics of the metalloids listed above are:

Therefore, since these elements share both the properties of metals and non-metals, they are called the metalloids.

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Answer:

oil floats on water because it is heavier than water

Salt is no longer visible after stirring as salt dissolves in water

by filtration

Answer:

Explanation:

Ratio of C : H : N : O  in grams

=  72.15 : 7.08 : 4.68 : 16.03 in grams

Ratio of C : H : N : O in moles

72.15/12 : 7.08/1 : 4.68/14 : 16.03/16 in moles  

6.01 : 7.08 : .334 : 1.00

6.01/ .334  : 7.08/.334 : .334/.334 : 1.00/.334   in moles

18 : 21.19 : 1 : 3

18 : 21 : 1 : 3

empirical formula = C₁₈H₂₁NO₃

It is codeine .

No, it does not pass the "fat pencil" test. Therefore, a normal distribution is not a reasonable model. Option B is the correct answer.

The "fat pencil" test is a quick visual check to determine if a dataset can be reasonably approximated by a normal distribution. In this case, the pH readings of wastewater show a significant deviation from a normal distribution. The presence of several low pH values (1.0) and a few high pH values (10.0, 10.5, 11.4) indicate a non-normal distribution with skewness and potential outliers. Therefore, it is not reasonable to model these data using a normal distribution.

Option B is the correct answer.

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Answer:

A) \({MnO_4}^- + 3 H^+ + \frac{5}{2} H_2O_2 \rightarrow Mn^{2+} + 4 H_2O + \frac{5}{2} O_2 \)

B) 7.5 molar

Explanation:

A) Reduction

\({MnO_4}^- + 8 H^+ + 5e^- \rightarrow Mn^{2+} + 4 H_2O\)

Oxidation

\(H_2O_2 \rightarrow O_2 + 2 H^+ + 2e^-\)

Multiplying the oxidation reaction by 5/2 and adding it to the reduction equation:

\({MnO_4}^- + 8 H^+ + 5e^- \rightarrow Mn^{2+} + 4 H_2O\)

+

\(\frac{5}{2} H_2O_2 \rightarrow \frac{5}{2} O_2 + 5 H^+ + 5e^-\)

-----------------------------------------------------------------------------------------------------

\({MnO_4}^- + 3 H^+ + \frac{5}{2} H_2O_2 \rightarrow Mn^{2+} + 4 H_2O + \frac{5}{2} O_2 \)

B) 10 ml = 0.01 L

20 ml = 0.02 L

mol of MnO4− = molarity*volume = 1.5*0.02 = 0.03

1 mol of MnO4− reacts with 5/2 mol of H2O2, then:

mol of H2O2 = 0.03*5/2 = 0.075

molarity = mol/volume = 0.075/0.01 = 7.5 molar

Answer:

63.9 grams. Yes, the Nacl was converted.  Maximum possible ppm is 540ppm.

Explanation:

I this is college level chemistry not regular high school chem.  

Answer:2

Explanation:

it is it do not ask questions

Answer:

e.g converting 6.55×10^24 molecules of Sodium to moles.

We use Avogadro's number NA= 6.02×10^23 molecules.

Explanation:

\(6.02 \times {10 }^{23} molecules \: are \: in \: 1 \: mole \: of \: sodium \\ 6.55 \times {10}^{24} molecules \: will \: be \: in \: ( \frac{6.55 \times {10}^{24} \times 1}{6.02 \times {10}^{23} } ) \\ = 10.88 \: moles \: of \: sodium\)

Considering the definition of STP conditions and Avogadro's Number, 1.952496 L of methane will occupy 5.25×10²² molecules at STP.

The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.

Avogadro's Number is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.

You can apply the following rule of three: if 6.023×10²³ molecules are contained in 1 mole of methane, then 5.25×10²² molecules are contained in how many moles of methane?

amount of moles of methane= (5.25×10²² molecules × 1 mole)÷ 6.023×10²³ molecules

amount of moles of methane= 0.087165 moles

There are 0.087165 moles of methane in 5.25×10²² molecules.

You can apply the following rule of three: if by definition of STP conditions 1 mole of methane occupies a volume of 22.4 liters, 0.087165 moles occupies how much volume?

volume= (0.087165 moles× 22.4 L)÷1 mole

volume= 1.952496 L

Finally, 1.952496 L of methane will occupy 5.25×10²² molecules at STP.

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Answer:

The presence of an impurity in a substance lowers the melting point, and raises the boiling point of the substance. For example, Impurities present in the water decrease the freezing temperature of the water, and in the same way, impurities increase the boiling point of the water.

Hess's law gave the net change in enthalpy.  According to the law, the enthalpy of the reaction is the addition of the enthalpies of the intermediate reaction. Thus, option B is accurate.

Hess's law or the law of constant heat summation is the measure of the heat or the enthalpy of the chemical reaction. It was given by the chemist, Germain Hess.

The law states that the enthalpy of the chemical reaction is the sum of the enthalpies involved in the reactants and the products of the reaction. It is independent of the steps involved in the reaction.

Therefore, option B. enthalpy of reaction is the summation of the enthalpy of the intermediates.

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The high-density brine drains into the water beneath the ice and in the process, the sea ice freshens while the salinity of the underlying water decreases, becoming less dense (Option C).

Sea ice is usually less salty than the ocean water it freezes from. During the process of ice formation, salt in the ocean water is expelled from the ice as it grows; most of the salt is ejected into the ocean but some remain trapped inside pockets of brine within the ice. When the air temperature falls below the freezing point of seawater (usually around -1.8 °C), water molecules start to form ice crystals, which grow and aggregate into a solid sheet of ice.

During this process, the salt rejected by the growing ice also accumulates, causing the salinity of the remaining brine to increase. Some of the brine is encapsulated within ice crystals, but most are trapped in the spaces between neighboring crystals.

Thus, the correct option is C.

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Considering the ionic nature of the Mg-O and Na-Cl bonds, the statement that is most likely true is b. mg-o will exhibit a weaker bond than na-cl.

The bond between atoms occurs due to the tendency of atoms to attain stability by achieving a fully filled valence shell. The atoms that tend to gain or lose electrons for achieving the stable electronic configuration are known as ions. These ions form an ionic bond with the other oppositely charged ion in order to attain stability.In the given options, option (b) is most likely to be true, i.e. mg-o will exhibit a weaker bond than na-cl because it requires less energy to remove electrons from Na or Cl, as they are monovalent, than from Mg or O, which are divalent.

The bond strength is inversely proportional to the size of the ion, and Mg is a larger ion than Na. In contrast, option (a) is incorrect as the bond between two ions depends on the charge of the ions and the distance between them, not on the type of ion. Option (c) is incorrect as the bond strength is inversely proportional to the size of the ion, not directly proportional. Option (d) is incorrect as only option (b) is most likely true.

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List 1 is the best choice of materials because it has a balance between biotic decomposers and abiotic factors needed for the worms and composting.

Composting is the process whereby remains of organic matter are keep in a favorable environment and conditions in order to allow for decomposition.

Compost consists of the right mix of biotic factors suchas worms and fungi as well as abioticfactors such as water and sun.

Therefore, based in the materials provided, List 1, because it has a balance between biotic decomposers and abiotic factors needed for the worms and composting.

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Answer:

D.) Carbon Dioxide

Explanation:

Pure Substance is defined as an element or compound that cannot be separated by physical means. In this case, Carbon Dioxide is a molecule that cannot be separated without breaking a chemical bond.

it's an ionic bond

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The percentage yield is equal to 200.6%.

The balanced equation for the given chemical reaction is :

2C2H + 5O2 → 4CO2 + 2H2O

Let's find the limiting reagent:

Mass of C2H = 120 g

Mass of O2 = 288 g

Molar mass of C2H = 26 g/mol

Molar mass of O2 = 32 g/mol

The number of moles of C2H is equal to:

120 g × 1 mol/26 g = 4.62 mol

The number of moles of O2 is equal to:

288 g × 1 mol/32 g = 9 mol

According to the stoichiometry of the balanced equation, 2 moles of C2H react with 5 moles of O2, so:

If 4.62 moles of C2H is used, then the required amount of O2 would be:

5/2 × 4.62 mol = 11.6 mol

We only have 9 mol of O2 which means it is the limiting reagent.

C2H is the excess reagent.

Let's find the mass of water produced:

According to the stoichiometry of the balanced equation,2 moles of H2O is produced per 2 moles of C2H2 moles of H2O is produced per 5 moles of O2If 9 mol of O2 is used, the number of moles of water produced would be:

2/5 × 9 mol = 3.6 mol

The mass of water produced is equal to:

3.6 mol × 18 g/mol = 64.8 g

Therefore, 64.8 g of water can be produced.

The amount of excess reagent is equal to:

4.62 mol - 2/2 × 9 mol = 4.62 - 9

= -4.38 mol

C2H is the excess reagent and it is not possible to have negative amount of a substance.

So, we assume that there is no excess reagent.

If 130 grams of water is produced, then the percentage yield is equal to:

Percent yield = actual yield/theoretical yield × 100

Theoretical yield is equal to 64.8 g

Actual yield is equal to 130 g

Percent yield = 130/64.8 × 100

= 200.6%

Therefore, the percentage yield is equal to 200.6%.

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Answer:

67.8%

Explanation:

La reacción de descomposición del CaCO₃ es:

CaCO₃ → CO₂ + CaO

Donde 1 mol de CaCO₃ al descomponerse produce 1 mol de CO₂ y 1 mol de CaO.

Usando la ley general de los gases, las moles de dioxido de carbono son:

PV = nRT.

Donde P es presión (1atm), V es volumen (20L), n son moles de gas, R es la constante de los gases (0.082atmL/molK) y T es temperatura absoluta (15 + 273.15 = 288.15K). Reemplazando los valores en la ecuación:

PV / RT = n

1atmₓ20L / 0.082atmL/molKₓ288.15K = 0.846 moles

Como 1 mol de CO₂ es producido desde 1 mol de CaCO₃, las moles iniciales de CaCO₃ son 0.846moles.

La masa molar de CaCO₃ es 100.087g/mol. Así, la masa de 0.846moles de CaCO₃ es:

0.846moles ₓ (100.087g / mol) = 84.7g de CaCO₃

Así, la pureza del marmol es:

(84.7g de CaCO₃ / 125g) ₓ 100 =

Answer:

Astronomers classify stars according to their physical characteristics. Characteristics used to classify stars include color, temperature, size, composition, and brightness. Stars vary in their chemical composition.

Explanation:

The minimum amount of energy required for a reaction between particles to occur is called the activation energy. Activation energy is the energy barrier that must be overcome for a chemical reaction to proceed.

It represents the minimum amount of energy that reactant molecules must possess in order to undergo the necessary chemical transformations and form products.

Activation energy can be thought of as the energy required to break the existing bonds in the reactant molecules, allowing for new bonds to be formed and products to be generated. The activation energy is influenced by factors such as the nature of the reactants, the reaction conditions, and the presence of catalysts.

By providing the required activation energy, either through heating, the presence of a catalyst, or other means, the reaction can overcome this energy barrier and proceed to completion.

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Answer : 501 g = 5.01 × 10¹¹ ng

Explanation :

The conversions used to convert gram to nano-gram is:

1 g = 10 dg

1 dg = 10 cg

1 cg = 10 mg

1 mg = 1000 μg

1 μg = 1000 ng

As we are given:

Convert 501 g to ng.

As,

1 g = 10 dg

So,

501 g = 501 × 10 dg

         = 501 × 10 × 10 cg                                   ( 1 dg = 10 cg )

         = 501 × 10 × 10 × 10 mg                          ( 1 cg = 10 mg )

         = 501 × 10 × 10 × 10 × 1000 μg                 ( 1 mg = 1000 μg )

         = 501 × 10 × 10 × 10 × 1000 × 1000 ng       ( 1 μg = 1000 ng )

501 g = 501000000000 ng = 5.01 × 10¹¹ ng

Therefore, 501 g = 5.01 × 10¹¹ ng

On combing Boyle’s law, Charles’s law, and Gay-Lussac’s law into a single proportional relationship law:

\(PV\propto T\)

Explanation:

             \(P\propto \frac{1}{V}\) ( Constant temperature)

             \(V\propto T\)  (Constant pressure)

            \(P\propto T\)   (Constant volume)

On combing Boyle’s law, Charles’s law, and Gay-Lussac’s law into a single proportional relationship law we get:

\(PV\propto T\)

In the above relation all the three laws; Boyles law, Charles law, and Gay Lussac's laws are followed.

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Answer:

Radiation is the transfer of heat energy through space by electromagnetic radiation.

Explanation:

Radiation is the transfer of heat energy through space by electromagnetic radiation. Most of the electromagnetic radiation that comes to the earth from the sun is in the form of visible light. Light is made of waves of different frequencies.

Answer:

CATION

Explanation:

If an atom has an equal number of protons and electrons, its net charge is 0. If it gains an extra electron, it becomes negatively charged and is known as an anion. If it loses an electron, it becomes positively charged and is known as a cation.

Answer:

D. 4 Valence Electrons and 4 Energy shells

Explanation:

Hello!

In this case, since finding the number of valence electrons and energy shells require the determination of the electron configuration for the element, knowing that germanium has 32 electrons (atomic number), we have:

\(1s^2,2s^2,2p^6,3s^2,3p^6,4s^2,3d^{10},4p^2\)

We can see that the outermost energy shell is 4 which storages 4 electrons (2 from 4s and 2 from 4p); therefore, we infer it has 4 valence electrons and 5 energy shells, so the answer is:

D. 4 Valence Electrons and 4 Energy shells.

Best regards!

This problem is providing us with the isotopic mass of Ga-71 and its percent abundance, so the isotopic mass of the second isotope is required. At the end, the result turns out to be 68.92547 amu.

In chemistry, isotopes are known as atoms of an element with different atomic masses (isotopic mass) but equal number of protons. In addition, they have a natural occurring abundance as a percentage.

Thus, this problem can be solved by writing the following weighted average for the atomic mass of Gallium:

\(m_{Ga}=m_{Ga-71}*\%ab_{Ga-71}+m_{Ga-?}*\%ab_{Ga-?}\)

Hence, since both percent abundances must sum 100 %, that of the second isotope will be 60.108 %. However, since its mass is unknown, one can use the average atomic mass of Gallium consigned in the periodic table in order to write the following, after plugging in what we have so far:

\(69.723=70. 9247050 amu *0.39892+m_{Ga-?}*0.60108\)

Hence, one can solve for the unknown as follows:

\(m_{Ga-?}=\frac{69.723amu-70. 9247050 amu *0.39892}{0.60108} \\\\m_{Ga-?}=68.92547amu\)

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The effective leader qualities demonstrated by Caleb are problem-solving skills, good time management, and effective scheduling. Thus, options A, B, and D are correct.

The project led by Caleb is based on natural resources. The team plays an important task in completing important and achieving the targets and goals for a project plays.

Caleb's team has lost focus on the project. The team leader is responsible to manage his team and encouraging them to achieve targets.

Caleb manages his team by arranging meetings and analyzing members' progress.

The leadership qualities that are demonstrated by Caleb are problem-solving skills, good time management, and effective scheduling. Thus, options A, B, and D are correct.

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Answer:

a & e

Explanation:

Answer:

b

Explanation:

The Theoretical temperature ie, Absolute Zero is when "All particles in a sample can never all be moving at once." Hence, Option (A) is correct

What is Absolute Zero temperature ?

It is determined by  ideal gas law;  absolute zero is taken as −273.15 degrees on the Celsius scale (International System of Units), which equals −459.67 degrees on the Fahrenheit scale.

Absolute zero is the lowest limit of the thermodynamic temperature scale, a state at which the enthalpy and entropy of a cooled ideal gas reach their minimum value, taken as zero kelvin.

The fundamental particles of nature have minimum vibrational motion, retaining only quantum mechanical, zero-point energy-induced particle motion.

According to the laws of thermodynamics,

Absolute zero cannot be reached using only thermodynamic means, because the temperature of the substance being cooled approaches the temperature of the cooling agent asymptotically and a system at absolute zero still possesses quantum mechanical zero-point energy, the energy of its ground state at absolute zero.

The kinetic energy of the ground state cannot be removed.

Therefore,

The theoretical temperature ie, Absolute Zero is when "All particles in a sample can never all be moving at once." Hence, Option (A) is correct

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