Consider the four weak bases listed below. Which would not exist primarily as a cation in aqueous solution at neutral pH? O only aniline, Kb = 4.0 x 10-10, pkg = 4.60 O only morphine, Kb = 1.6 x 10-6, pkg = 8.20 O only caffeine, Kb = 1.4 x 10-4, pKq - 10.1 all will be cationic only quinine, Kb = 3.3 x 106, pkg = 8.52 none will be cationic

Answer:

0.04 M.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated below:

Ba(OH)₂ + H₂SO₄ —> BaSO₄ + 2H₂O

From the balanced equation above,

The mole ratio of acid, H₂SO₄ (nₐ) = 1

The mole ratio of base, Ba(OH)₂ (n₆) = 1

Finally, we shall determine the molarity of Ba(OH)₂ solution. This can be obtained as follow:

Volume of base, Ba(OH)₂ (V₆) = 93.9 mL

Volume of acid, H₂SO₄ (Vₐ) = 15.3 mL

Molarity of acid, H₂SO₄ (Mₐ) = 0.247 M

Molarity of base, Ba(OH)₂ (M₆) =?

MₐVₐ / M₆V₆ = nₐ / n₆

0.247 × 15.3 / M₆ × 93.9 = 1/1

3.7791 / M₆ × 93.9 = 1

Cross multiply

M₆ × 93.9 = 3.7791

Divide both side by 93.9

M₆ = 3.7791 / 93.9

M₆ = 0.04 M

Therefore, the molarity of the Ba(OH)₂ solution is 0.04 M

[\(H^{+}\)] value of soft drink is 0.0001mol/l when given pH is 4.

Given:

pH = 4

Needs to find: [\(H^{+}\)]

Formula to find: pH=−log\(_{10}\) [\(H^{+}\)]

We can put the values of pH in above formula as,

pH=−log\(_{10}\) [\(H^{+}\)]

4 =−log\(_{10}\) [\(H^{+}\)]

To calculate hydonium ion concentration, formula is as follows;

[\(H^{+}\)] = \(10^{-pH}\)

[\(H^{+}\)] = \(10^{-4}\) = 0.0001mol/l

[\(H^{+}\)] value of soft drink is 0.0001mol/l

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Heat of vaporization is the amount of heat energy required to convert a substance from its liquid state to its gaseous state at a constant temperature and pressure. It is a measure of the strength of the intermolecular forces holding the molecules together in the liquid phase.

Heat of vaporization:

Heat of vaporization is the amount of heat energy required to convert a substance from its liquid state to its gaseous state at a constant temperature and pressure. It is a measure of the strength of the intermolecular forces holding the molecules together in the liquid phase.

When a substance is heated, the added energy increases the kinetic energy of the molecules, causing them to move faster. As the temperature rises, the average kinetic energy of the molecules increases, and eventually, the molecules have enough energy to overcome the intermolecular forces and escape from the liquid phase, forming a gas.

The heat of vaporization is specific to each substance and is typically expressed in units of joules per gram (J/g) or calories per gram (cal/g). It is an important property in various applications, such as in the design of cooling systems, understanding phase changes, and calculating energy requirements for processes involving vaporization.

Fact:

The heat of vaporization for water is approximately 40.7 kilojoules per mole (kJ/mol) at its boiling point of 100 degrees Celsius.

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The heat of vaporization is the amount of heat required to convert one gram of a substance from its liquid state to its gaseous state without any change in temperature. It is denoted by delta Hvap.

This is a measure of the energy that is required to overcome the intermolecular forces that hold a liquid together and break the bonds between the molecules to form a gas.Heat of vaporization is the amount of heat required to convert one gram of a substance from its liquid state to its gaseous state without any change in temperature.

There are many interesting phenomena where the heat of vaporisation can be seen. For instance, heat is continuously added to liquid water when it boils on a hob in order to overcome the intermolecular interactions and turn it into water vapour. Similar to how sweat evaporates from our skin, the heat that is removed from us as the sweat changes from a liquid to a gas cools us down.

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Answer:

its valency must be 3

hope it helps.

Answer: -3

Explanation: an element with atomic number of 15 is Phosphorus the Electronic configuration of phosphorous is 2, 8, 5. It has 5 electrons in its last orbit which can be completely filled by accepting 3 electrons.

Answer:

A: The heat added represents an energy change.

Explanation:

Correct on EDG test

430 g of AgCl would be needed to make a 4.0m solution with a volume of 0.75 L.

Remember that mol/L is the unit of molarity (M).

We can compute the necessary number of moles of solute by multiplying the concentration by the liters of solution, according to dimensional analysis.

0.75L×4.0M=3.0mol

Then, using the periodic table's molar mass for AgCl, convert from moles to grams:

3.0mol×143.321gmol=429.963g

The final step is to round to the correct significant figure, which in this case is two: 430g.

Hence, 430 g of AgCl would be needed to make a 4.0m solution with a volume of 0.75 L.

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Answer: The ratio of the amounts of U 238 and Pb 206 in a rock sample enables the age of the rock to be estimated using the technique of radiometric dating. It moves back in the periodic table until the isotope falls in the band of stability at Pb 206.

Explanation:

Best Team And Party in Pokemon Legends Arceus. Includes the best team for Cyndaquil, Oshawott, Rowlett, by type, early and middle game, where to catch, recommended Pokemon, & more!

1. LiCl (Lithium chloride) CsBr (Cesium bromide) NaCl (Sodium chloride).

3. Group 1 elements, also known as alkali metals, form 1+ ions because they have one valence electron in their outermost energy level.

4. The formula of the sulfide ion is S2-.

5. The ions in NaCl stay together due to electrostatic attraction between the oppositely charged ions.

6. The formula of potassium sulfide is K2S. In this compound, potassium (K+) forms a 1+ ion, and sulfide (S2-) forms a 2- ion.

1. The three ionic compounds from the given list are:

LiCl (Lithium chloride)

CsBr (Cesium bromide)

NaCl (Sodium chloride)

Dot-and-cross diagrams for the three ionic compounds:

2. LiCl:

Li (Lithium) has 1 valence electron while Cl (Chlorine) has 7 valence electrons. The electron from Li is transferred to Cl, resulting in the formation of Li+ and Cl- ions. The dot-and-cross diagram would show Li with no dots and Cl with 8 dots around it.

CsBr:

Cs (Cesium) has 1 valence electron while Br (Bromine) has 7 valence electrons. Similar to LiCl, the electron from Cs is transferred to Br, resulting in Cs+ and Br- ions. The dot-and-cross diagram would show Cs with no dots and Br with 8 dots around it.

3. NaCl:

Na (Sodium) has 1 valence electron while Cl (Chlorine) has 7 valence electrons. Again, the electron from Na is transferred to Cl, forming Na+ and Cl- ions. The dot-and-cross diagram would show Na with no dots and Cl with 8 dots around it.

4. Group 1 elements, also known as alkali metals, form 1+ ions because they have one valence electron in their outermost energy level. These elements have a strong tendency to lose this valence electron to achieve a stable electron configuration similar to the noble gas configuration.

The formula of the sulfide ion is S2-.

5. The ions in NaCl stay together due to electrostatic attraction between the oppositely charged ions. In NaCl, the sodium (Na+) ion has a positive charge, and the chlorine (Cl-) ion has a negative charge. These opposite charges attract each other, forming an ionic bond.

The strong electrostatic attraction between Na+ and Cl- keeps the ions together in a crystal lattice structure.

6. The formula of potassium sulfide is K2S. In this compound, potassium (K+) forms a 1+ ion, and sulfide (S2-) forms a 2- ion. To balance the charges, two potassium ions are required for every sulfide ion.

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Explanation:

it contains 6.02*1023atoms

Atom, the smallest unit of material which may be separated without releasing electrically charged. It is also the smallest unit of mass with the properties of a chemical element.

          \(\to \bold{ 1.75 \times 6.022\times 10^{23}}\\\\\to \bold{ 10.5385 \times 10^{23}}\\\\\)

Therefore, the answer is "\(10.5385 \times 10^{23}\)".

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Answer:

Answers are numbered below:

Explanation:

"The three parts of the cell theory are as follows: (1) All living things are made up of cells, (2) Cells are the smallest units (or most basic building blocks) of life, and (3) All cells come from preexisting cells through the process of cell division..."

I hope this helps you! Have a great day!

2S + 302 = 2SO3

Mass of S = 6.3g

Mass of 02 = 10.0g

M(S) = 32g/mol

n = 6.3g/32g/mol

n = 0.195mol

n(S)/n(SO3) = 2/2

Let n(SO3) = x

2(0.195) = 2x

0.39 = 2x

x = 0.195

Therefore, n(SO3) = 0.195mol

But M(SO3) = (32×1) + (16×3)

= 80g/mol

m = 80g/mol × 0.195mol

m = 15.6g

Answer:

λ = 6x10^-5 m

Explanation:

c = λf

3.00x10^8 = 5.00x10^12 x λ

λ = 6x10^-5 m

The chemical symbols for three different atoms or atomic cations with 26 electrons are Fe, \(Co^+\), \(Ni^{2+}\)

Explanation:

So, from this, we can write chemical symbols for three different atoms or atomic cations with 26 electrons are Fe, \(Co^+\), \(Ni^{2+}\).

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The product formed when water, in the presence of sulfuric acid, is added to 2-methyl-2-pentene would be 2-methyl-2-pentanol.

The sulfuric acid acts as a catalyst, allowing the water to add to the double bond of the 2-methyl-2-pentene molecule. This creates a hydroxyl group, -OH, on each of the two carbon atoms in the double bond and forms a new molecule of 2-methyl-2-pentanol. This reaction is a type of hydration reaction, which is a reaction between an alkene and water, and it is an example of an addition reaction. The reaction is exothermic, meaning it releases heat and creates a hydroxyl group, which is an alcohol-functional group. This reaction is also reversible, meaning that it can be reversed by adding heat.

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Taking into account the definition of enthalpy of a chemical reaction, the quantity of heat produced when 80.0g of O₂ react is 1110 kJ.

The enthalpy of a chemical reaction as the heat absorbed or released in a chemical reaction when it occurs at constant pressure.

The enthalpy is an extensive property, that is, it depends on the amount of matter present.

In this case, the balanced reaction is:

C₃H₈ (g) + 5 O₂ (g) → 3 CO₂ (g) + 4 H₂O(g) + 2220 kJ

This equation indicates that when 1 mole of C₃H₈ reacts with 5 moles of O₂, 2220 kJ of heat is produced.

If the molar mass of O₂ is 32 g/moles, the mass of O₂ that react is calculated as:

mass of O₂= 5 moles× 32 g/mole

mass of O₂= 160 grams

Then you can apply the following rule of three: if 160 grams of O₂ releases 2220 kJ of heat, 80 grams of O₂ releases how much heat?

heat= (80 grams of O₂ ×2220 kJ)÷ 160 grams of O₂

heat= 1110 kJ

Finally, the quantity of heat released is 1110 kJ.

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Answer:

salt dissolving in water is usually considered to be a physical change, however the chemical species in salt solution (hydrated sodium and chlorine ions) are different from the species in solid salt.

1) Grams of lead.

Convert grams of lead (II) nitride to moles of lead (II) nitride

Convert moles of lead (II) nitride into moles of Pb

Convert moles of Pb into grams of Pb

There is 31.64 g of ions of lead in the sample of paint.

Answer:

There are 0.0305 calories in 0.128 joules

Explanation:

Given that,

Heat absorbed, Q = 0.128 J

We need to find the heat energy absorbed in calories.

We know that the relation between joules and calories is as follows :

1 calorie = 4.184 J

1 J = (1/4.184) J

So,

\(0.128\ J=\dfrac{0.128 }{4.184}\\\\=0.0305\ cal\)

So, there are 0.0305 calories in 0.128 joules

Answer:

I think (B) is right answer because here oxygen is a combustible material and combustible is always take place when oxygen is burn

The sum of the electrical and chemical forces acting on an ion is known as its electrochemical gradient.

Correct option is D.

This gradient is a measure of the potential energy of an ion that is generated by the combined influence of the electrical and chemical forces. The electrical force is generated by the charge difference between the ions and their surrounding environment, while the chemical force is generated by the concentration gradient between the ions and their surrounding environment.

The electrochemical gradient influences the movement of ions across the membrane, which is the basis for many biological processes such as active transport, muscle contraction, and nerve impulse propagation. The electrochemical gradient also affects the rate of metabolic reactions, as it can drive the movement of molecules in and out of cells.

Correct option is D.

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The amino acid that is not glucogenic among the options provided is leucine (option e). Leucine is one of the branched-chain amino acids (BCAAs) and is primarily ketogenic, meaning it is metabolized to produce ketone bodies rather than glucose.

The remaining options (alanine, aspartate, glutamate, and glycine) are all glucogenic amino acids, meaning they can be converted into intermediates of glucose metabolism.

Among the amino acids you listed, leucine (option e) is the only one that is not glucogenic. Leucine is a branched-chain amino acid (BCAA) that undergoes primarily ketogenic metabolism, meaning it is primarily converted into acetyl-CoA and acetoacetate, leading to the production of ketone bodies. It does not contribute significantly to glucose production.

On the other hand, alanine (option a), aspartate (option b), glutamate (option c), and glycine (option d) are all glucogenic amino acids. They can be converted into intermediates of glucose metabolism, such as pyruvate, oxaloacetate, and glyceraldehyde-3-phosphate, which can enter the gluconeogenic pathway to produce glucose.

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The periodic table has changed very little since it was originally developed by Mendeleev and Meyer is referred to as a false statement.

This is defined as the arrangement of elements based on their atomic number in a tabular form. It consists of 18 vertical columns which re referred to as groups and seven horizontal rows called period.

Henry Moseley in 1913 organized Mendeleev's periodic table based on physical properties.This took into consideration their atomic number rather than atomic mass and other missing elements.

This is the periodic table which is used currently and therefore hasn't changed much which is why false was chosen.

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Answer: To determine the elements on other planets. The Mercury Surface, Space Environment, Geochemistry, and Ranging (MESSENGER) Gamma-Ray Spectrometer (GRS) can measure gamma rays emitted by the nuclei of atoms on planet Mercury's surface that are struck by cosmic rays.

Explanation:

The speed of each atom just before the collision is 4.43 × \(10^{4}\)

n1 = 1, n2 =2

Wavelength is in UV region; thus n1 will be 1.
1/121.6 × \(10^{-9}\) = 1.097 × \(10^{7}\) × (1/1² - 1/n²)

n2 = 2

1/2 m\(v^{2}\)  = hc/λ

v =  4.43 × \(10^{4}\)

A chemical element's atom is a particular type of particle of substance. A positively charged electron or many negatively charged electrons encircle the central nucleus of an atom. Protons and neutrons, two relatively hefty particles that make up the positively charged nucleus, may be present.

The fundamental components of matter are atoms. Atoms are the building blocks of all mass and space-occupying objects. Positively charged particles are protons. The chemical element's atomic number is determined by how many protons are present in its nucleus. In the Periodic Table of Elements, different elements' atomic numbers can be found. For instance, sodium's atomic number is 11 and it possesses 11 protons. mp is the symbol for the rest mass of a proton.

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Answer:

The Eukaryotic cell that the organelle shows below belongs to the Nucleus.

Explanation:

In fact, the mere presence of a nucleus is considered one of the defining features of a Eukaryota cell.

The balanced reaction equation is;

\(2LiI + Pb(NO_{3} )_{2} --- > 2LiNO_{3} + PbI_{2}\) as we can see from the equation that is written here.

In the balancing of the reaction equation, we have to make sure that the number of the reacting atoms on the reactant and the product side are the same for each of the elements.

On both sides of the equation, tally the atoms of each element. First, balance the polyatomic ion or the most complicated molecule. One element at a time, balance the other atoms of the reactants and products. Make sure that every atom is now evenly distributed on both sides of the equation.

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The remaining mass of the isotope after 30 years will be 12.5 g.

To calculate the remaining mass of an isotope after a certain time, we can use the formula:

Remaining mass = Initial mass × (1/2)^(time elapsed / half-life)

In this case, we have a 100 g sample of an isotope with a half-life of 10 years, and we want to find the remaining mass after 30 years.

Using the formula, we can substitute the values:

Remaining mass = 100 g × (1/2)^(30 years / 10 years)

Simplifying the equation, we have:

Remaining mass = 100 g × (1/2)^3

Calculating the value inside the parentheses, we get:

Remaining mass = 100 g × (1/8)

Therefore, the remaining mass of the isotope after 30 years will be:

Remaining mass = 12.5 g

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Answer:

B. P (Phosphorus)

Explanation:

The element is be phosphorus.

This is true because phosphorus has a larger atomic radius than carbon. If you move than the group, elements gain additional electron shell. That additional electron shell keeps electrons far from the nucleus of the atom. This actually increases the atomic radius. Also, phosphorus is more electronegative than aluminum because phosphorus itself is a non-metal and non-metals are generally electronegative while aluminum is a metal and electropositive.  

Phosphorus has a lower ionization energy than argon because the ionization energy across the period (i.e from left to right) increases and across period 3, you will find phosphorus first before argon in the periodic table.

Answer:

The growth of the plant

Explanation:

The growth of the plant from the bean soil is the dependent variable I believe. This is because it could change depending on many factors for e.g. the amount of light or water