In a chemical compound, the elements are always combined in the same proportions by:.

Explanation:

The answer is mentioned above.

Hope it helps.

The balanced chemical equation for the reaction is as follows:

6 Li[s] + \(N_{2}\)[g] = 2\(Li_{3}\)N[s]

Meaning of the reaction is that 6 moles of lithium reacts with nitrogen to form two moles of lithium nitride.

The product formed is:

Highly flammable and reactive chemical and a Dangerous fire and explosion hazard.

Lithium Nitride can affect you when breathed in and may be absorbed through the skin.

Contact can severely irritate and burn the skin and eyes. Breathing Lithium Nitride can irritate the nose and throat.

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Answer:

C

Explanation:

Its eurasian plate.

Answer:

There arr 1.5*1024 molecules in 2.40 moles of H2O.

Answer:

Nitrogen is considered to be the most important nutrient, and plants absorb more nitrogen than any other element. .The second of the Big 3, phosphorus, is linked to a plant's ability to use and store energy, including the process of photosynthesis. It's also needed to help plants grow and develop normally.

The two fundamental tendencies that favor a chemical reaction occurring spontaneously are (3) toward lower energy and less randomness, and (4) toward lower energy and greater randomness. These tendencies involve the concepts of enthalpy (energy change) and entropy (randomness or disorder).

A spontaneous reaction generally aims to lower the energy of the system, making it more stable. This is described by the change in enthalpy (∆H). If ∆H is negative, it indicates an exothermic reaction with energy being released, making the reaction more likely to occur spontaneously.

Entropy (∆S) measures the disorder or randomness of a system. Generally, spontaneous reactions are associated with an increase in entropy, as nature tends to move towards greater disorder. If ∆S is positive, it implies an increase in randomness and the reaction is more likely to proceed spontaneously.

Considering these factors, a spontaneous chemical reaction would ideally involve both lower energy (negative ∆H) and greater randomness (positive ∆S). However, reactions with lower energy and less randomness can still be spontaneous, depending on the balance between the enthalpy and entropy changes.

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Answer:

Answer: medium level profession can be defined as some one who has moved past entry level but isn't nearing the end . whereas high level profession means a person has moved past entry level and also has reached the end.

Answer:

medium level profession refers to the profession that can be carried out with the help of extra khowledge,skill and vocational training

higher level profession refers to the top level profession that requires higher education and special indeth tranning

Answer:

B.

Explanation:

The electron dot diagram which is also known as the Lewis electron dot diagram is a diagram that shows an atom's valence electrons by placing dots, which represent the valence electrons of the element, around the elements symbol

The element for which the electron dot diagram is found = Neon, Ne

The atomic number of neon, Ne = 10

The electronic configuration of neon = 1s²2s²2p⁶

The valence shell is the outermost shell having   the highest value of the coefficient of the orbitals, n = 2s²2p⁶

The number valence electrons in neon = The number of electrons in the valency shell = 2 electrons + 6 electrons = 8 electrons

The number of valence electrons in neon = 8

Therefore, the electron dot diagram for neon will have 8 dots located around the Ne symbol, which gives option B

Answer:

Explanation: Sodium has an atomic number of 11, so it has 11 protons. The atomic mass is 23, so there are 23 − 11 = 12 neutrons. The charge is +1, so there is 1 more proton than electrons, so there are 10 electrons

Explanation:

Therefore, the correct answer is (E) The reaction would shift toward products and the solubility would increase.

Both hydrogen ions (H +) and chloride ions (Cl -) would be added to the equilibrium mixture if hydrochloric acid were to be added. When hydrogen ions are on the right side of the equilibrium, it will shift to the left to make up for this, increasing the concentration of reactants.

When HCl is added to the system, what will happen to the chemical equilibrium There will be a leftward change in the chemical equilibrium.

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Answer: Energy

Explanation:

Energy is the ability to do work or produce heat.

The Na+/K+ pump transports three sodium ions out of the cell for every two potassium ions moved into the cell. This is an example of an antiport pump.

Antiport pumps are a type of active transport mechanism that simultaneously move two or more substances in opposite directions across a membrane.

In this case, the Na+/K+ pump helps to maintain the electrochemical gradient and resting membrane potential in cells by exchanging sodium and potassium ions against their concentration gradients, using energy derived from ATP hydrolysis. This process is crucial for various cellular functions, including nerve impulse transmission and muscle contraction.

In contrast, symport pumps transport substances in the same direction, and uniport pumps transport only one substance at a time. Facilitated diffusion, on the other hand, is a passive transport mechanism that uses protein carriers to move substances across a membrane without the expenditure of energy.

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When a drug is administered as a salt, it is typically combined with an appropriate counterion to form a salt form of the drug. This salt form enhances the solubility of the drug in aqueous solutions, which can improve its bioavailability and allow for better dissolution and absorption in the body.

The correct answer is Many drugs are administered as salts rather than as the corresponding neutral compounds because salts often have greater water solubility and stability. This is important for effective delivery and absorption of the drug in the body. Furthermore, salts often provide improved stability compared to the corresponding neutral compounds. The addition of counterions in the salt form can enhance the chemical and physical stability of the drug molecule, protecting it from degradation or hydrolysis.

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Answer:

The p orbital can hold up to six electrons. We'll put six in the 2p orbital and then put the remaining electron in the 3s. Therefore the sodium electron configuration will be 1s22s22p63s1.

Explanation:

The second option 2NO(g) + O2(g) - 2NO2(g) could be reaction 2 in the overall reaction 2O(g) + 2NO(g) - 2NO2 + 2O3(g).

The overall balanced  equation involves the combination of two reactants to form two products. The reactants in reaction 2 must include O2 and NO, which combine to form NO2. The balanced equation for this reaction is 2NO(g) + O2(g) → 2NO2(g). This equation matches the stoichiometry of the overall reaction, and the enthalpies of reactions 1 and 2 can be added to determine the enthalpy of the overall reaction.

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Answer:

Molecular mass of NH3 = ( 14 + 3 ) = 17 g

\(PV = \frac{m}{m _{r}} RT \\ P \times 50.0 \times {10}^{ - 6} = \frac{68.0}{17} \times 8.314 \times (30.0 + 273) \\ P = \frac{68.0 \times 8.314 \times 303}{17 \times 50.0 \times {10}^{ - 6} } \\ P = 2.02 \times {10}^{8} \: Pascals\)

Answer:

Elements

Explanation:

Elements cannot be broken down into a simpler substance

Matter cannot be created or destroyed in chemical reactions. This is the law of conservation of mass. In every chemical reaction, the same mass of matter must end up in the products as started in the reactants. Balanced chemical equations show that mass is conserved in chemical reactions.

Matter cannot be created or destroyed in chemical reactions. This is the law of conservation of mass. In every chemical reaction, the same mass of matter must end up in the products as started in the reactants. Balanced chemical equations show that mass is conserved in chemical reactions

The ions that have six d electrons in the outermost d subshell are c. \(Os^{2+}\) ,\(Fe^{2+}\) and f.\(Ru^{2+}\). The correct answer is option c, d, and f.

This is because osmium (Os) and ruthenium (Ru) and iron(Fe) have 6 electrons in d shell and 2 in s shell. When they lose two electrons to become ions, the outermost d subshell is left with six electrons.

In the case of these ions, we can determine the number of electrons in the outermost d subshell by looking at the electron configuration and counting the number of electrons in the d subshell that have the highest energy. This will be the subshell that is filled last, and therefore the one that determines the ion's chemical properties.

For example, in the case of \(Os^{2+}\) and \(Ru^{2+}\), the outermost d subshell has six electrons (\(5d^6\)). In contrast, the other ions listed have a different number of d electrons in the outermost subshell: \(Y^{2+}\) has one, \(Zn^{2+}\) has none, \(Tc^{2+}\) has five, and \(Mn^{2+}\) has five.
Therefore, options c, d, and, f are correct.

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Atp links endergonic and exergonic reactions.

In chemical thermodynamics, an exergonic reaction is a chemical reaction where the amendment in the free energy is negative (there may be an internet unleash of free energy).

This indicates a spontaneous reaction if the system is closed and initial and final temperatures are the same. For processes that crop up in a very closed system at constant pressure and temperature, Gibbs free energy is used,

whereas the Helmholtz energy is relevant for processes that take place at constant volume and temperature. associate degree reaction occurring at a constant temperature while not the input of electrical or gauge boson energy is exergonic, in step with the second law of thermodynamics. An example is a cellular respiration

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This problem is providing the ratio of nitrogen to oxygen by mass in nitrogen monoxide, NO, as 7.0:8.0 and asks for the same ratio but in NO₂ and N₂O₇. After doing the calculations, the results are 7.0:16.0 and 1.0:4.0 respectively.

In chemistry, one can calculate the mass ratios in chemical formulas according to the atomic mass of each atom. In such a way, one knows the mass ratio of nitrogen to oxygen in NO is 7.0:8.0 because we divide the atomic mass of nitrogen by oxygens:

\(\frac{14}{16}=\frac{7.0}{8.0} \)

Now, for chemical formulas with subscripts, one must multiply the atomic mass of the element by the subscript in the formula, which is the case of NO₂ and N₂O₇ as shown below:

\(NO_2:\frac{14}{16*2}=\frac{14}{32} =\frac{7.0}{16.0} \\ \\ N_2O_7:\frac{14*2}{16*7}=\frac{28}{112} =\frac{1.0}{4.0} \)

Therefore, the results for NO₂ and N₂O₇ are 7.0:16.0 and 1.0:4.0 respectively

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There is one molecule that is not directly produced during the Krebs cycle, and that is acetyl-CoA.Acetyl-CoA is the starting molecule for the Krebs cycle but is not produced within it. '

Instead, acetyl-CoA is generated from the breakdown of pyruvate, which is the end product of glycolysis. The Krebs cycle, also known as the citric acid cycle or the tricarboxylic acid (TCA) cycle, is a central metabolic pathway that occurs in the mitochondria of cells.

It plays a vital role in the breakdown of carbohydrates, fats, and proteins to produce energy in the form of ATP. During the Krebs cycle, a series of chemical reactions take place, resulting in the generation of several products.

Pyruvate enters the mitochondria and undergoes a series of enzymatic reactions, known as pyruvate decarboxylation, to produce acetyl-CoA. Acetyl-CoA then enters the Krebs cycle, where it combines with oxaloacetate to form citrate, initiating the cycle.

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Explanation:

When we have direct sunlight, the temperature is higher compared to indirect sunlight.

Direct sunlight is usually overhead whereas indirect sunlight is at an angle to the surface.

Answer:

NO ONE DOSE :(

Explanation:

Answer:

less methane

Explanation:

methane is increasing because of global warming

Answer:

845.4

Explanation:

Actual yield : 45.752 g ⇒no option

Given

The theoretical yields of Cl₂ : 65.35 g and 68.08 g

Required

The actual yield

Solution

Reaction

4 HCl (aq) + MnO₂ (s) → MnCl₂ (aq) + Cl₂ (g) + 2H₂O (l)

Because there are two theoretical yields, then we can choose the smallest one because the value is usually determined from the limiting reactant (in this reaction the limiting reactant is MnO₂)

So 65.36 g is The theoretical yields of Cl₂

Then the actual yield :

\(\tt \%yield=\dfrac{actual}{theoretical}\times 100\%\\\\actual=\%yield\times theoretical\\\\actual=70\%\times 65.36=45.752\)