what is the reaction that corresponds to the first ionization energy of lithium, li ? express your answer as a chemical equation.

The extent of a compound's dissolving is indeed determined by the thermodynamic quantities of enthalpy and entropy. The enthalpy of dissolving is dependent on the strength of the intermolecular forces between the ions in the solid state and the strength of the interactions between the ions and the solvent molecules.

The stronger the ion-ion and ion-solvent interactions, the more negative the enthalpy of dissolving will be, indicating a more favorable dissolution process.

The entropy of dissolving is typically thermodynamically favorable because when ions are dissolved, they become more disordered and have more possible arrangements, leading to an increase in entropy. This is often referred to as the "entropy of mixing." In other words, when a solid dissolves, its constituent particles become dispersed throughout the solvent, increasing the system's overall randomness.

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Answer:

Chemical formula of Oxygen is O2.

We know ,

1 mole of a substance contains 6.022×10^23, Avogadro’s Constat.

Here, Molar mass of O = 16u

And molar mass of O2 = 32u

And 32g of O2 = 1 mole of O2

It means that,

32g of O2 = 6.022×10^23 molecules

Answer:

The correct answer is given in the picture

This ANSWER IS ONLY CORRECT WHEN Oz STAND FOR OZONE

Answer:

  C. The boiling point of water

Explanation:

The shape of the water and its rate of evaporation (including steam generation) will change across containers with different shapes, surface areas, and temperatures. The appropriate choice is the one shown above.

For a mixture of polar compounds, you want a nonpolar solvent, and with a mixture of nonpolar compounds, you want a polar solvent.

Polar compounds have polar covalent bonds and have positive and negative pole. They have a symmetrical electron distribution. These are compounds in which the shared electrons are not distributed equally between the atoms. These types of compounds usually have high melting and boiling points, good solubility, and high polarity.

Nonpolar compounds are those in which the atoms are joined by covalent bonds, and there is no separation of charge across the molecule. The bond electrons are distributed equally between the two atoms. Because they have low polarity, these compounds do not dissolve easily in polar solvents.

Polarity is defined as the separation of charge between atoms in a molecule, or in a group of atoms that act as a single entity. The polarity of a molecule is determined by the difference in electronegativity between the atoms and the shape of the molecule.

Therefore, for a mixture of polar compounds, you want a nonpolar solvent, and with a mixture of nonpolar compounds, you want a polar solvent.

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The three states of matter are solid - example is stone, liquid - example is water and gas - example is air.

A matter is referred to as a substance which has a certain mass and takes up a certain volume in space.

For example pen, pencil, toothbrush, water, milk are matters as well as car, bus, bicycle is also a matter. So matter is considered as a living thing and a non-living thing.

There are three states of matter and they include;

They have different properties, which can be explained by looking at the arrangement of their particles. This is the theoretical temperature at which particles have the least amount of energy and the slowest movement.

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Answer:

1 gram of H2 will be produced from 12 grams of Mg.

Explanation:

According to Stoichiometry, 0.5 moles of Mg are present. 1 mole of Mg produces 1 mole of H2, so 0.5 moles of Mg will produce 0.5 moles of H2. Multiplying molar mass of H2 i.e. 2 gram/mole with 0.5 moles, we can find the mass of H2 in grams which is 1 gram.

The resistance = B. 10 Ω

Electric current (symbolized by the letter "i) is the amount of charge flowing in the conductor of each unit of time  

The international standard unit of electric current is Coulomb/second or Ampere (A).  

Electric current is also a ratio between the voltage and the amount of resistance at the conductor.  

Can be formulated  

\(\large{\boxed{\bold{I=\frac{V}{R}}}\)

V = Voltage (volts)  

R = resistance (ohms)  

This formula is also known as Ohm's Law, which states that  

the amount of current flowing is directly proportional to the voltage and inversely proportional to the resistance.  

The current is 1.5 amperes and the voltage is 15-V, so :

\(\tt I=1.5~A\\\\V=15~V\)

The resistance :

\(\tt R=\dfrac{V}{I}\\\\R=\dfrac{15}{1.5}\\\\R=\boxed{\bold{10~ohm}}\)

The more unusual the value is relative to the other values in the dataset .In this case, the z-score for the systolic blood pressure is 2.18, while the z-score for the heart rate is -1.74. Since the absolute value of the z-score for the systolic blood pressure is larger than that of the heart rate, it can be concluded that the systolic blood pressure value is more unusual relative to the other patients in the sample as compared to the patient's heart rate value.

Question 24Given: Mean systolic blood pressure = 132 mm

Hg; standard deviation of systolic blood pressure = 33;

Systolic blood pressure of patient = 204 mmHg

.The formula to calculate z-score = `(x - μ) / σ`

Where, `x` is the value of the variable,

`μ` is the mean of the variable,

`σ` is the standard deviation of the variable

.Substituting the values, we getz-score = `(204 - 132) / 33 = 2.18`

Therefore, the z-score associated with the systolic blood pressure value of 204 mmHg is 2.18

. Question 25

Given: Mean heart rate = 99 bpm;

standard deviation of heart rate = 27;

Heart rate of patient = 52 bpm.

The formula to calculate z-score = `(x - μ) / σ

`Where, `x` is the value of the variable,

`μ` is the mean of the variable,

`σ` is the standard deviation of the variable.

Substituting the values, we getz-score = `(52 - 99) / 27 = -1.74

`Therefore, the z-score associated with the heart rate of 52 bpm is -1.74.

Question 26

Z-score can be used to compare two different data sets. The absolute value of the z-score shows how many standard deviations the value is away from the mean. Hence, the larger the absolute value of the z-score, the more unusual the value is relative to the other values in the dataset.In this case, the z-score for the systolic blood pressure is 2.18, while the z-score for the heart rate is -1.74. Since the absolute value of the z-score for the systolic blood pressure is larger than that of the heart rate, it can be concluded that the systolic blood pressure value is more unusual relative to the other patients in the sample as compared to the patient's heart rate value.

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The grams of PbBr₂ formed when excess solution is added to 76.0 ml of 0.625 m solution of Pb(NO₃)₂ are 17.4325.

The balanced chemical equation for the process is,

Pb(NO₃)₂(aq) + BaBr₂(aq) → PbBr₂(s) + Ba(NO₃)₂(aq)

So, from the reaction, we can see that when one mole of Pb(NO₃)₂ reacts, one mole of PbBr₂ precipitate is formed.

It is given that 76ml of 0.625 M Pb(NO₃)₂ is reacting,

We know,

Moles = Molarity x volume (in liters)

Now, putting the value to find the moles of Pb(NO₃)₂ soluton,

Moles of Pb(NO₃)₂  = 76 x 0.625/1000

Moles of Pb(NO₃)₂  = 0.0475 moles.

So, the mole of the precipitate formed is 0.0475 Moles.

Now, we also know,

Moles = Formed mass/Molar mass.

Molar mass of PbBr₂ = 367 g/mol.

Moles of PbBr₂ = 0.0475 moles.

Formed mass of PbBr₂ = 367 x 0.0475

Formed mass of  PbBr₂ = 17.4325 Grams.

So,  17.4325 Grams of PbBr₂ is formed.

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Answer:

Valency is defined as the number of hydrogen atoms which combine directly or indirectly with one atom of an element.

Example:

One atom of nitrogen combines with three atoms of hydrogen to form ammonia gas. So, the valency of nitrogen is 3.

An orbital is a region in space where there is a high probability of finding an electron.

In an atom there are orbitals. Orbitals are mathematical probability functions that describe regions in space where an electron could be found according to the wave mechanical model of the atom.

In the 3p sublevel, there are three orbitals. In the 2s sublevel, there is only one orbital. In the 4f sublevel, there are seven orbitals. In the 5d sublevel, there are five orbitals. In the third principal level, there are three nine orbitals in the fifth energy level, there are 25 orbitals. Note that in principal level, there are n^2 orbitals where n is the principal energy level.

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the pH of a 0.000125 M HBr solution is 3.90. The pH of a diluted 175 mL 0.000125 M HBr solution in a total volume of 3.00 L is 2.22. Calculate the pH of a 0.000125 M HBr solution. The dissociation of HBr can be written as follows: HBr ⇌ H+ + Br-

The pH of a 0.000125 M HBr solution is 3.90. The pH of a diluted 175 mL 0.000125 M HBr solution in a total volume of 3.00 L is 2.22.

Solution:

Calculate the pH of a 0.000125 M HBr solution

The dissociation of HBr can be written as follows: HBr ⇌ H+ + Br-

According to the law of mass action, the equilibrium expression for the dissociation of HBr can be written as follows:

[H+][Br-] / [HBr] = k [H+][Br-] = k[HBr]

Here, k is the dissociation constant of HBr, which is 8.7 × 10^-10.

[H+][Br-] = (8.7 × 10^-10)[HBr]

M = [H+]; M = [Br-]

M = 0.000125 M, so [H+] = [Br-] = 0.000125 M

[H+] = 0.000125 M

The pH of a solution is defined as follows:

pH = -log[H+]

pH = -log[0.000125]

pH = 3.90

What is the pH of the diluted solution if 175 mL of this solution is diluted to a total volume of 3.00 L?

To solve this problem, we'll use the following formula: M1V1 = M2V2

M1 = 0.000125 M

M2 = ?

V1 = 175 mL

V2 = 3000 mL = 3.00 L

Before we begin, we'll convert the volume to liters.

175 mL ÷ 1000 = 0.175 L

Now, we can solve for M2: M1V1 = M2V2

(0.000125 M)(0.175 L) = M2(3.00 L)

M2 = 0.00000729 M

The pH of this solution can now be calculated: pH = -log[M2]

pH = -log[0.00000729]

pH = 2.22

Answer: So, the pH of a 0.000125 M HBr solution is 3.90. The pH of a diluted 175 mL 0.000125 M HBr solution in a total volume of 3.00 L is 2.22.

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Answer: 2,090J

The equation to find the specific heat is determined by the equation q = mcΔT, where q = total heat, m=mass, c = specific heat, and ∆T change in temperature.

Recall that the specific heat capacity for water is 4.18J/gºC

So, plug this along with your specific values into the equation.

q = 100g * (4.18J/gºC) * (20.0ºC-15.0ºC)
q = 2090J

The assertion is untrue. Alex discovered her pebbles were gone just after tropical storm because to the extremely high wind speed. The consequence of deposition was this.

An organized center of low pressure known as a tropical storm develops over warm tropical waters. Tropical storms can have thermal heat surface winds of 63 to 118 km/h (39 to 73 mph).

These are their classifications: A tropical cyclone having sustained winds in excess exceeding 38 kph (33 knots) or even less is referred to as a tropical depression. A tropical storm is a cyclone with winds that may reach maximum sustained speeds of 39 to 73 mph. A hurricane is a tropical storm with winds that may reach miles per hour (64 knots) or more.

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Answer:

Why does D-block start on the fourth row of the periodic table?

Explanation:

The require more energy to reach 3d than 4s, and they fill up 4p before 4d, and so forth. ... The energy is lower for 6s than 4f, and 4f and 5f are lower in energy than the final D level.

Answer: In its natural condition, a pure element

Based on the values of bond energies given, the reaction is endothermic and absorbs 20 kJ of heat when 2 moles of acetylene reacts.

The equation of the combustion of acetylene sis given below:

2 C2H2 + 5 O2 -----> 4 CO2 + 2 H2O

Sum of ΔH bonds broken:

2 × C≡C + 2(2 × C—H) = 2 × 839 + 4 × 413 = 3330 kJ

5 × (2 × O = O) = 10 × 495 = 4950 kJ

Sum of ΔH bonds broken = 8280 kJ

Sum of ΔH of bonds formed:

Energy of C=O is 799 kJ

4 × 2 × C=O = 8 × 799 = 6392 kJ

Energy of H-O bond is 467kJ

2 × 2 × H-O = 2 × 2 × 467 = 1868 kJ

Sum of ΔH of bonds formed = 8260 kJ

Heat change, ΔH = 8280 -8260 kJ

Heat change, ΔH = 20 kJ

Therefore, based on the bond energies given, the reaction is endothermic and absorbs 20 kJ of heat when 2 moles of acetylene reacts.

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The mass of the water in hydrated sample after heating if the mass of the Epsom salt residue after heating was 1.25g is 1.31 gram.

The Epsom salt are also called as Magnesium sulfate. Epsom salt are usually encountered in the form of a hydrate MgSO4·nH2O, for various values of n between 1 and 11. The mostly common is the heptahydrate MgSO4·7H2O which is known as Epsom salt that is a household chemical with many traditional uses, including bath salts. Epsom salts are white crystalline solid which is soluble in water but not in ethanol.

Suppose a sample of 2.56 g of Epsom salt (mgso4 x nh2o) was heated in the oven to remove all the hydration water contained in the hydrate. the mass of the residue after heating was 1.25g.

Mass of Epsom salt before heated = 2.56 gram.

Mass of MgSO4 after heated = 1.25 gram.

Mass of water in hydrated sample = 2.56 - 1.25

                                                         = 1.31 gram

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The complete question is,

A sample of 2.56 g of Epsom salt (mgso4 x nh2o) was heated in the oven to remove all the hydration water contained in the hydrate. the mass of the residue after heating was 1.25g. this prelab models the easiest calculation involving the removal of water from a hydrate because we assume that all the water is removed. Determine the mass of the H2O lost due to heating. Show your calculation.

Explanation:

The higher its electronegativity, the more an element attracts electrons. The atom with higher electronegativity, typically a nonmetallic element, is assigned a negative oxidation number, while metallic elements are typically assigned positive oxidation numbers.... Hope it is useful brainliest plz if it was useful....

The relationship between electrons and oxidation number has bee the negative oxidation number implies the gain of the electron, while positive oxidation number implies the loss of electron by elements.

The oxidation number has been defined as the number of electrons lost or gained by an element to form a chemical bond. The elements that lose electrons are assigned positive oxidation number.

The elements that gain electrons to form a chemical bond are assigned a negative oxidation number.

The relationship between electrons and oxidation number has bee the negative oxidation number implies the gain of the electron, while positive oxidation number implies the loss of electron by elements.

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Sodium fluoride (NaF) is a competitive inhibitor of the enzyme enolase, which is involved in the glycolysis pathway of cellular respiration. When NaF is added to a respiration reaction, it can inhibit the production of pyruvate and consequently decrease the rate of respiration.

However, the addition of pyruvate to a NaF-inhibited respiration reaction can overcome this inhibition by increasing the concentration of substrate available for the Krebs cycle. The Krebs cycle, also known as the citric acid cycle, is responsible for producing ATP, NADH, and FADH2 from acetyl-CoA, which is derived from pyruvate.

By increasing the concentration of pyruvate, the rate of respiration can increase because more pyruvate can be converted to acetyl-CoA, providing more substrate for the Krebs cycle. This leads to an increase in the production of ATP and other products of cellular respiration.

Overall, the addition of pyruvate to a NaF-inhibited respiration reaction can overcome the inhibition of NaF by increasing the concentration of substrate available for the Krebs cycle and ultimately leading to an increase in the rate of respiration.

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Answer:

Items that are made from coconut fibers are:

Floor mats, brushes, mattresses, etc.

(You can choose from the options)

Explanation:

Hope this helps

Im new to brainly ^^

Answer: Breads and cakes

There are several steps to draw lewis dot structure of any chemical compound. Here, we taking RbF.  Structure is given below with the image.

1. Start by writing the chemical symbol for the element at the center of the structure. In this case, it is Rb for Rubidium.

2. Draw dots around the symbol to represent the valence electrons. Rb has one valence electron, so you would put one dot around the Rb.

3. Next, write the chemical symbol for the other element in the compound, in this case F for Fluorine.

4. Draw dots around the symbol to represent the valence electrons. Fluorine has 7 valence electrons, so you would put 7 dots around the F.

5. To create the bond between the two elements, use a pair of dots to connect the Rb and F. This represents the sharing of electrons between the two elements.

So the Lewis dot structure for RbF would be represented as:

        . .

Rb+ [:F:]

        . .

This representation shows that Rb and F share one pair of electrons, forming a bond between them, and the dots around Rb and F represent the remaining number of valence electrons that are not involved in the bond.

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The reaction that correctly shows the balanced equation is Na₂CO₃ = CO₂ + Na₂O (option B).

A chemical reaction is a process, typically involving the breaking or making of interatomic bonds, in which one or more substances are changed into others.

A chemical equation is said to be balanced when the number of atoms of each element on both sides of the equation are the same.

According to this question, sodium carbonate is said to release carbon dioxide when decomposed by heating.

The balanced chemical equation for the decomposition is as follows:

Na₂CO₃ = CO₂ + Na₂O

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Claim: The color change observed in the beakers suggests a chemical reaction took place.

Evidence: When the colorless hydrogen was poured into beaker 2, the solution turned purple or pinkish, indicating a chemical change. When the solution was poured into beaker 3, the color changed back to colorless, indicating the reaction had completed. When the solution was poured into beaker 4, the hydrogen bubbled and danced around the solution, suggesting a chemical reaction was taking place. When the solution was poured into beaker 5, it became very cloudy, indicating a chemical reaction had occurred. Finally, when the solution was poured into beaker 6, the color changed to pinkish and became not clear, further suggesting a chemical reaction.

Reasoning: Chemical reactions often involve a change in color or the formation of a precipitate, which was observed in the different beakers. The observations made in the beakers suggest that a chemical reaction occurred, and this is consistent with the idea that a reaction between the hydrogen and the solution in the beakers took place. Therefore, it is reasonable to conclude that a chemical reaction took place in the beakers.

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The Darwin's theory of natural selection is responsible for the Galapagos birds to have various beak shapes. The evolution is a very slow and gradual process.

According to Darwin's theory of natural selection, species keep on evolving or changing with time. During the change of environment the requirements of an organism also change and they adapt to the new environment.

This process of changing over a period of time as per the natural requirements is called the adaptation. Darwin identified that these sparrow like birds came to the Galapagos island by wind.

The finches evolved from a common ancestor to have different beaks which is well suited for different types of food they feed on.

Thus Galapagos birds are example for adaptive radiation.

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The equation that represents a single replacement reaction given the various options is 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) (option 2)

A single replacement reaction, also known as single displacement reaction is a reaction in which elements higher in the electro-chemical series displace or replace elements lower in the electro-chemical series displace from a solution.

The following example illustrates single replacement reaction:

A + BC -> AC + B

From the above reaction, we can see that A has replace/displace B to from AC.

With the above information, we can determine the equation that represents single replacement reaction. Details below:

Equation from the questions:

From the above, we can see that only 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) conform to single replacement reaction.

Thus, the correct answer to the question is: 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) (option 2)

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The concentration (Molarity, M) of the newly prepared KCl solution will be 0.36 moles L⁻¹.

Molarity is defined as the moles of a solute present in a specific volume of the solution.

M = moles (n) / volume (V)

According to the question,

mass of KCl = 9.3 g

volume of solution = 350 ml

                             = 350/1000 L = 0.350 L

To find the moles of KCl,

moles (n) = mass of solute (m) / molar mass of the solute

molar mass of KCl = 74.55 g mol⁻¹

n = 9.3 g / 74.55 g mol⁻¹ = 0.125 moles

Therefore, concentration (M) of the KCl solution = 0.125 moles / 0.350 L

M =  0.36 moles L⁻¹

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Answer:  1: Cathode rays travel in a straight line and can cast sharp shadows. Property 2: Cathode rays are negatively charged. Property 3: Electric field and magnetic field deflect cathode rays.

Explanation: