9. How does the electron configuration of an ion of
a Group 1A or Group 7A element compare to that
of the nearest noble gas?

The concentration of the phosphoric acid solution using the obtained results would be  1.2 M.

First, we need to determine the volume of base used for each trial.

Volume of base used = final - initial burette reading

Titre value = 12.1+12.0+12.2/3 = 12.1 mL

From the balanced equation of the reaction: \(2H_3PO_4(aq) + 3Sr(OH)_2(aq) -- > Sr_3(PO_4)_2(s) + 6H_2O(l)\)

The mole ratio of the phosphoric acid to the strontium hydroxide is 2:3.

Mole of 2.2 M, 12.1 mL strontium hydroxide = 2.2 x 12.1/1000

                                                                        = 0.027 mol

The equivalent mole of phosphoric acid = 2/3 x 0.027

                                                                   = 0.018 mol

Concentration of 15 mL, 0.018 mol phosphoric acid = 0.018/0.015

                                                                                      = 1.2 M

In other words, the molarity of the phosphoric acid is 1.2 M.

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the membrane potential change from -70 mV to -90 mV can also be caused by the opening of ligand-gated channels in a neuron. The option B.

This change is usually caused by the opening of ligand-gated channels that allow negatively charged ions (such as chloride) to enter the cell, which would cause hyperpolarization of the neuron. Therefore, both options E) and B) can be correct answers to the question, depending on the specific type of ligand-gated channels that are involved in the membrane potential change. The opening of ligand-gated channels can cause a rapid change in the membrane potential of a neuron. This change can either be depolarization, which is a shift towards a more positive potential, or hyperpolarization, which is a shift towards a more negative potential. The direction of the change depends on the ion that the channel allows to pass through.

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It is a nucleophilic reducing agent that works best on polar multiple bonds such as C=O. Aldehydes can be converted to primary alcohols, ketones to secondary alcohols, carboxylic acids and esters to primary alcohols, amides and nitriles to amines using the LiAlH₄ reagent.

Any of a class of organic compounds characterized by one or more hydroxyl (OH) groups attached to an alkyl group's carbon atom (hydrocarbon chain). Alcohols are organic derivatives of water in which one of the hydrogen atoms has been replaced by an alkyl group, which is typically represented by the letter R in organic structures.

Ketones are a type of chemical produced by your liver when it breaks down fats. When you fast, exercise for long periods of time, or don't eat as many carbohydrates, your body uses ketones for energy. Low levels of ketones in the blood are not necessarily harmful.

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Answer:

11.454 grams

Explanation:

Mass of C2H5OH is 46 grams.

Now, applying Unitary Method,

1 Mol -----> 46 grams

0.249 Mols -----> (46 x 0.249) grams = 11.454 grams.

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The water cycle on earth is dependent upon the sun’s energy. Without the sun, all the water on the earth will be frozen and no water will be available for the living organisms. So without the sunlight water would not exist. Option C is correct.

The light and heat energy of the sun makes it possible for life forms to survive on earth. The movement of water around the earth in different phases like solid,liquid, and gas depends on the energy from the sun.

The energy from the sun also influences the ocean currents, weather, climate, and seasons. The plant life is made possible on earth with the help of sunlight which is crucial for plants to carry out photosynthesis.  

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Polyethylene differs from oil, grease, and wax in a way that polythene is a tough plastic while the wax or grease is brittle solid.

Polyethylene is a long chain of ethylene, C2H6, which are molecules attached end-to-end in generally a straight chain. Oils, greases, and wax are a mixture of multiple hydrocarbon molecules which randomly combined in more of a mixture. Because of the high molecular weight of polythene, it is a tough plastic while the wax or grease is brittle solid.

One major difference among polymers and small molecules or monomers are the characteristics which polymers exhibit. Polymers generally have higher viscosities, higher boiling points and can present improved mechanical strength over small molecules or monomers.

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The correct answer is option A) 28%. The volume percentage of ethanol = (volume of ethanol / total volume of solution) x 100Volume percentage of ethanol = (38 mL / 138 mL) x 100Volume percentage of ethanol = 0.2754 x 100Volume percentage of ethanol = 27.54 % ≈ 27.6 %

The volume percentage of ethanol in the solution is 27.6%. The volume percentage is the ratio of the volume of solute to the volume of the solution multiplied by 100. It is denoted by (v/v)% and it is used in chemistry to measure the volume of a solute dissolved in a solution. To find the volume percentage of ethanol in the solution, we first need to calculate the total volume of the solution. The total volume of the solution = volume of ethanol + volume of toluene= 38 mL + 100 mL= 138 mL.

Now, we can calculate the volume percentage of ethanol in the solution. The volume percentage of ethanol = (volume of ethanol / total volume of solution) x 100. The volume percentage of ethanol = (38 mL / 138 mL) x 100. The volume percentage of ethanol = 0.2754 x 100Volume percentage of ethanol = 27.54 % ≈ 27.6 %Therefore, the correct answer is option A) 28%.

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Answer Explanation:

If it is like H, or O or N or Na or Cl, those are the elements. Those are on the Periodic table. pH is the acidity and basicity of a substance, how acidic or basic(caustic) it is. mol is Moles. kPa is kilopascals. STP is standard temperature and pressure, at 0*C(Celsius), or 273.15 K(Kelvin), and 101,325 pascals, or 101.325 kilopascals.

Avagadro's Number is 6.022x10^23, the number of atoms in a mole. The Ideal Gas Law is P(Pressure in kPa) times V(Volume in L, liters) equals n(number of moles of gas) times R(the universal gas constant, or 8.3145 (L kPa/K mol) or 8.3145 liters kilopascals per Kelvin mole. that is just a few of them.

Answer:

d) water

Explanation:

Answer:

C) sodium chloride

The mass in grams of 0.450 moles of magnesium sulfate, MgSO4 is approximately 54.17 grams.

The molar mass of magnesium sulfate (MgSO4) can be calculated by adding the atomic masses of magnesium (Mg), sulfur (S), and four oxygen (O) atoms. The atomic masses can be obtained from the periodic table.

Mg = 24.31 g/mol

S = 32.06 g/mol

O = 16.00 g/mol

Molar mass of MgSO4 = (1 * 24.31) + (1 * 32.06) + (4 * 16.00) = 120.37 g/mol

To determine the mass of 0.450 moles of MgSO4, we can use the formula:

mass = moles * molar mass

Substituting the given values, we get:

mass = 0.450 mol * 120.37 g/mol = 54.17 g

Therefore, the mass of 0.450 moles of magnesium sulfate (MgSO4) is approximately 54.17 grams.

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The lithium is a chemical compound which is denoted by the symbol of Li and the atomic number of the lithium is 3.

Lithium is known as a chemical compound and the lithium is denoted with the symbol of Li. The atomic number of the lithium is 3. The structure of the lithium is very soft and it is a silvery white alkali metal. Under the various conditions the lithium is the least dense metal and also lithium is the least dense solid metal.

The atomic mass of the lithium is  6.941 u.

The oxidation state of the lithium +1.

The electronic configuration of the lithium is 2s1.

The lithium is very small in size but it is very powerful.

So we can conclude that lithium is a chemical compound which is denoted by the symbol of Li and the atomic number of the lithium is 3.

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The molar concentration of ammonia is 2.976M.

Molarity of HCl = number of moles/ volume

Number of moles = Molarity of Hcl * volume

Hence the number of moles of ammonia =\(14.88 * 10^{-3}\)

From question volume of ammonia =\(5 * 10^{-3}\)

Molarity = \(14.88 * 10^{-3}/5 * 10^{-3}\)

Molarity  \(=2.976\)

What is meant by molar concentration?

Molar concentration is the most effective way of describing a solute concentration in a solution. Molarity is described as the total number of moles of solute dissolved per liter of solution,i.e., M = mol/L.

How do you calculate the molar concentration?

To calculate the Molar Concentration, we will find the molar concentration by dividing the moles by the liters of water used in the solution.

Thus, the molar concentration of ammonia is 2.976M

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Answer:

i think so

Explanation:

yes

Answer:

1. The compound 2NaCl consists of:

» B. 1 atom of chlorine element.

» D. 1 atom of sodium element.

2. The valency of iron in iron (III) sulphate is:

» A. 3 [ valency of only iron ]

» B. 2 [ valency of only sulphate ion ]

3.The systematic name of the compound CuSO4:

» B. Copper (II) sulphate

Explanation:

\(.\)

Answer:

1) A.

2) A.

3) A.

When an acid such as hydrochloric acid (HCl) reacts with a metal like zinc (Zn), the gas produced is hydrogen gas (H₂).

When hydrochloric acid (HCl) reacts with zinc (Zn), something interesting happens. The acid gives away its hydrogen atoms (H⁺) to the zinc. At the same time, the zinc gives away some of its electrons. As a result, hydrogen gas (H₂) is produced. The gas forms little bubbles that you might see during the reaction. The remaining zinc combines with the chlorine atoms (Cl⁻) from the acid to form zinc chloride (ZnCl₂). So, to sum it up, when acid (like HCl) and metal (like zinc) react, they create hydrogen gas and a compound called zinc chloride. The hydrogen gas bubbles out, and the zinc chloride dissolves in the remaining acid.

A single displacement reaction, also known as a metal-acid reaction, occurs when hydrochloric acid (HCl) and zinc (Zn) are in contact. This reaction results in the creation of zinc chloride (ZnCl₂) and hydrogen gas (H₂) as the zinc metal displaces the hydrogen in the hydrochloric acid. While the acid's hydrogen ions lose electrons and undergo oxidation, the zinc atoms acquire electrons and undergo reduction. It is a redox (reduction-oxidation) reaction because it includes both oxidation and reduction reactions.

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Answer: c

Explanation: built different

Answer:

Hg+2 + 2Cl- -> HgCl2

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Explanation:

One of the first chemicals used by Lister to prevent surgical infections was carbolic acid also known as Phenol which has antiseptic properties.

Joseph Lister, a British surgeon, is known for pioneering antiseptic techniques to prevent surgical infections in the 19th century. One of the key chemicals he used was carbolic acid, also known as phenol.

Lister observed that the high mortality rate from post-operative infections could be reduced by implementing strict antiseptic practices. He introduced the use of carbolic acid as a disinfectant during surgeries and for wound dressings. Carbolic acid has strong antiseptic properties and is effective in killing bacteria.

Lister would spray a diluted solution of carbolic acid in water over the surgical field and instruments, and he also used it to soak dressings. This practice helped to reduce the risk of infection by killing bacteria and preventing their growth.

The use of carbolic acid by Lister revolutionized surgical practices and significantly decreased the incidence of infections, leading to improved patient outcomes.

One of the first chemicals used by Lister to prevent surgical infections was carbolic acid (phenol). Its antiseptic properties played a crucial role in reducing the risk of infections during surgeries in the 19th century.

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Answer:

4

Explanation: on the left side of the equation there are 4 carbons, to make 4 carbons on the right side of the equation you need 4 of the CO2 molecules.

Answer:

Iconic, neutral, and cation

Explanation:

When a metal and a nonmetal react, the result is a(n) Ionic compound. Ratio of cat ions and anion depends on the ionic charge of each. All ionic compounds come together in the simplest ratio to make a  neutral formula unit and the cation  is always written first in the formula.

The ionic compounds are solids in crystalline form and these are formed by opposite charged ion packing,  formed by the reaction of metals react with non-metals.

Elements can either gain or lose electrons in order to achieve noble gas configuration and these formation of ions helps them gain stability, the structure of ionic compound depend on the relative sizes of the cations and anions.

Ionic compounds are salts, oxides, hydroxides, sulphides, and the inorganic compounds. Ionic solids are held together by the electrostatic attraction between the positive and negative ions.

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I think there are a bond??

Answer:

it is covalent

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I would say 1ft. sorry if i'm wrong

The density in kg/m³ = 1.14 x 10⁴

Density is a quantity derived from the mass and volume  

Density is the ratio of mass per unit volume  

With the same mass, the volume of objects that have a high density will be smaller than objects with a smaller type of density  

The unit of density can be expressed in g/cm³ or kg/m³  

Density formula:  

\(\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}\)

ρ = density , g/cm³ or kg/m³  

m = mass  , g or kg

v = volume  , cm³ or m³  

A density of Lead : ρ = 11.4 g/cm³

the density in kg/m³ :

\(\tt 11.4~\dfrac{g}{cm^3}\times \dfrac{kg}{10^3~g}\times \dfrac{cm^3}{10^{-6}~m^3}=\boxed{\bold{1.14\times 10^4~\dfrac{kg}{m^3}}}\)

A battery is a device that converts chemical energy into electrical energy through a process known as an electrochemical reaction.

When a battery is connected to a circuit, the electrochemical reaction causes a flow of electrons from the anode to the cathode, generating an electric current that can power a device.

The metal chosen for the anode must be capable of losing electrons easily, while the metal chosen for the cathode must be capable of accepting electrons. The choice of metals can also affect the voltage and capacity of the battery, as well as its overall efficiency.

In general, the metals used in a battery should have a large difference in their electronegativity values, which determines how easily an atom can attract electrons. Common metals used in batteries include zinc, lithium, nickel, and cadmium.

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A 14-year-old adolescent girl, Alice, has been diagnosed with anorexia nervosa. In the assessment of Alice, the findings that are more commonly associated with anorexia nervosa are Dysmenorrhea, decreased body temperature, and Heat intolerance.

Dysmenorrhea: Anorexia nervosa can lead to hormonal imbalances and disruptions in the menstrual cycle, which can cause irregular or absent periods (amenorrhea) and sometimes dysmenorrhea (painful periods).

Decreased body temperature: Anorexia nervosa can lead to lower body weight and reduced body fat, which can result in a lower body temperature. This is a physiological response to conserve energy and maintain the body's functions.

Heat intolerance: Anorexia nervosa can affect the body's ability to regulate temperature properly, leading to increased sensitivity to heat or cold. Individuals with anorexia may feel more discomfort or intolerance in extreme temperatures.

Hence,  the findings that are more commonly associated with anorexia nervosa are explained above.

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The molar solubility of lead(II) carbonate (PbCO3) is approximately 8.60×10^(-8) M.

The balanced equation for the dissolution of lead(II) carbonate is:

PbCO3(s) ⇌ Pb2+(aq) + CO3^2-(aq)

The equilibrium expression for the solubility is:

Ksp = [Pb2+][CO3^2-]

Since the stoichiometric ratio between Pb2+ and CO3^2- in the balanced equation is 1:1, the concentration of Pb2+ and CO3^2- will be the same, and we can represent it as x.

Therefore, the equilibrium expression becomes:

Ksp = x * x

Substituting the given value of Ksp (7.40×10^(-14)) into the equation:

7.40×10^(-14) = x^2

To solve for x, take the square root of both sides:

x = √(7.40×10^(-14))

Using a calculator, we find:

x ≈ 8.60×10^(-8)

The molar solubility of lead(II) carbonate (PbCO3) is approximately 8.60×10^(-8) M.

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The reaction of the hydrogen and the chlorine atoms would lead to the formation of HCl

In this reaction, each chlorine molecule (Cl2) breaks apart into two chlorine atoms (Cl), and each hydrogen molecule (H2) breaks apart into two hydrogen atoms (H). These reactive atoms then combine to form hydrogen chloride molecules (HCl).

It's worth noting that the reaction between hydrogen gas and chlorine gas is highly exothermic and releases a significant amount of energy.

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Based on the mole ratios, the plausible sets of formulas for the two compounds are: Sample 1: XY, and Sample 2: X3Y

Option 2 (XY and X3Y) is the correct answer.

The mole ratios are used to identify the formula of the compounds as follows:

Sample 1: Contains 0.32 g of X

Sample 2: Contains 0.41 g of X

To compare the ratios, we need to find the mass of X per gram of Y in each sample.

For Sample 1:

Mass of X = 0.32 g

Mass of Y = 1.00 g - 0.32 g (sum of masses of X and Y is 1.00 g)

For Sample 2:

Mass of X = 0.41 g

Mass of Y = 1.00 g - 0.41 g

Now, let's calculate the ratios:

Ratio for Sample 1 = (Mass of X / Mass of Y) = (0.32 g / (1.00 g - 0.32 g))

Ratio for Sample 2 = (Mass of X / Mass of Y) = (0.41 g / (1.00 g - 0.41 g))

Considering the options provided to determine which sets of formulas are possible based on the ratios:

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The affect of ground water depletion is Lower water level, Loss of vegetation and Wildlife disruption.

The amount of water that is present below the upper surface area of the land, which are not easily accessible is known as ground water.

And this ground water keeps the soil hydrated and responsible for good vegetation by providing many minerals through water, wildlife is also depends on the ground water as they provide survival for many species. If the ground water is deplected then it also affects the flow of streams and lower water level.

Hence option (d) is correct i.e. All of the above.

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Answer

D. All of the above

Explanation