Which of the following has the largest radius?
ОА. К
O B. K+
O C. Na
O D. Na+

In a 0.5 M solution of calcium phosphate (Ca3(PO4)2), the concentration of calcium ions (Ca2+) can be determined by considering the stoichiometry of the compound. In one formula unit of calcium phosphate, there are 3 calcium ions. Therefore, the concentration of calcium ions in this solution is 3 times the concentration of the calcium phosphate.

So, the concentration of calcium ions (Ca2+) in this 0.5 M solution is:

(3 calcium ions) × (0.5 M calcium phosphate) = 1.5 M

The concentration of calcium ions in the 0.5 M solution of calcium phosphate is 1.5 M.

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Answer:

Explanation:    29.99g/mol

Answer:

23.0 g/mol

Explanation:

To find the molar mass of sodium or Na, look at the periodic table.

Then try to find where sodium is.

After that, then try to check the atomic mass of sodium.

The atomic mass of sodium is 23.0

So the molar mass is 23.0 g/mol

That's it. Molar mass means the same thing as atomic mass.

Hope it helped!

Answer:

materials which do not show the quality of lustre i.e. shiney surface

for eg- non metals except Iodine

Explanation:

hope it helps u plz mark as the brainliest

Answer:

These are materials that don't have lustre

Explanation:

They are not shiny.

They include non-metals but not iodine.

Hope it helps.

Answer:

b) velocity.

c) velocity, m/s²

d)change in velocity, change in direction, change in both velocity and direction.

e) increasing or decreasing

The observed result would be the formation of water, sodium bisulfite, and sodium chloride, which may remain dissolved in the solution.

When equal volumes of 0.1 M aqueous HCl (hydrochloric acid) and 0.01 M aqueous Na2SO3 (sodium sulfite) are mixed, a reaction occurs, resulting in the formation of new substances.

HCl is a strong acid, while Na2SO3 is a salt derived from a weak acid, sulfurous acid. The reaction between them is a neutralization reaction, where the H+ ions from HCl react with the SO3^2- ions from Na2SO3 to form water (H2O) and sodium bisulfite (NaHSO3). NaCl, a common salt, is also formed as a byproduct.

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The molecular geometry of BrF5 is sqaure pyramidal and the approximate bond angle is 120 degrees which is c.

The total number of valence electrons in bromine pentafluoride (BrF5) can be determined by adding the valence electrons of each atom. Bromine has 7 valence electrons and each fluorine atom has 7 valence electrons, so the total number of valence electrons in BrF5 is:

7 (from bromine) + 5(7) (from five fluorine atoms) = 42 electrons

The molecular geometry of BrF5 is square pyramidal, which means that it has one central bromine atom surrounded by five fluorine atoms. The shape of the molecule is distorted from a perfect octahedron due to the lone pair of electrons on bromine.

The approximate bond angles in BrF5 are 90 degrees for the axial fluorine atoms and 120 degrees for the equatorial fluorine atoms. The lone pair on bromine occupies an equatorial position, further distorting the bond angles. Therefore, the correct answer is c. 120 degrees.

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Answer:

i would go for the 2nd as far as i know they were a big continent and an earthquake separes them all

If you decrease the temperature of a container while keeping volume and number of moles constant, the gas pressure will decrease. This is because the pressure of a gas is directly proportional to its temperature, as stated by the Gay-Lussac's Law or the Pressure-Temperature Law.

When the temperature decreases, the kinetic energy of gas molecules also decreases, resulting in lower pressure. Therefore, if the volume and number of moles remain constant, decreasing the temperature will result in a decrease in gas pressure.

If you decrease the temperature of a container while keeping the volume and the number of moles constant, the gas pressure will decrease. This is because when the temperature decreases, the kinetic energy of the gas molecules also decreases, leading to a lower frequency of collisions between the molecules and the container walls. As a result, the pressure exerted by the gas decreases. This correlation is explained by Gay-Lussac's Law, which states that the pressure of a gas is directly proportional to its temperature when the volume and the number of moles remain constant.

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Answer:

temperature

Explanation:

There are 118 elements on the periodic table.

The alternative method to collect the gas and measure the volume is by a gas syringe.

What is a gas syringe?

Gas syringe is an equipment used to pump or withdraw gas from a closed container and can measure the volume of the gas produced in any chemical reaction.

The volume of the gas produced can be measured by reading the measuring scale on the gas syringe when the plunger moves in a gas syringe.

Hence, gas syringe is an alternative method to collect and measure the volume of the gas in a chemical reaction.

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A chemical equation must balance according to the rule of conservation of mass. According to the rule, mass cannot be generated or removed during a chemical process. Here the given equation is a balanced one.

A chemical equation is said to be balanced if the quantity of each type of atom in the reaction is the same on both the reactant and product sides. In a balanced chemical equation, the mass and the charge are both equal.

A chemical equation is a symbolically expressed chemical reaction, with the reactant entities on the left and the product entities on the right, in the form of symbols and formulas.

In the equation, NaCl₂ + 2NaOH → Na(OH)₂ + 2NaCl

Here the number of 'Na', 'Cl', 'O' and 'H' atoms are equal on both sides of the equation.

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Answer:

2

Explanation:

The principal energy levels for an atom with a ground state electronic configuration is 2;

       K    L

       2    4

Principal quantum number represents the main energy level in which the orbital is located or the average distance of the orbital in the nucleus.

The principal quantum number takes whole number values such; i.e;

             n  = 1, 2, 3, 4, 5

For the given on the principal energy levels are 2.

The total number of occupied principal energy levels in this atom is 2.

The energy levels are the locations where electrons are found and are

usually close to the nucleus. The energy levels 1s and 2s are involved and

occupied in the atom with a electronic configuration of 2-4 in its ground

state.

The 1s energy level has a maximum of 2 electrons which can fill it while the

2s energy level has a maximum of 8 electrons which can fill it.

This is why the total number of occupied principal energy levels in this atom

will be 2.

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awnseris chemical hhhh Explanation:

The freezing point of the solution is -11.8 °C.

The boiling point of the solution is 103.31 °C.

To determine the freezing point of the solution, we can use the equation:

ΔTf = Kf * m

where:

ΔTf is the freezing point depression,

Kf is the cryoscopic constant (for water, Kf = 1.86 °C/m),

m is the molality of the solution (moles of solute per kilogram of solvent).

First, let's calculate the molality (m) of the solution:

Molar mass of ethylene glycol (C2H6O2):

C = 12.01 g/mol

H = 1.01 g/mol (x 6) = 6.06 g/mol

O = 16.00 g/mol (x 2) = 32.00 g/mol

Total molar mass = 12.01 g/mol + 6.06 g/mol + 32.00 g/mol = 50.07 g/mol

Number of moles of ethylene glycol (C2H6O2) = mass / molar mass

Number of moles = 30.8 g / 50.07 g/mol = 0.615 mol

Mass of water = volume x density = 96.6 mL x 1.00 g/mL = 96.6 g

Now, let's calculate the molality:

Molality (m) = moles of solute / mass of solvent (in kg)

Molality = 0.615 mol / 0.0966 kg = 6.36 mol/kg

Now we can calculate the freezing point depression (ΔTf):

ΔTf = Kf * m

ΔTf = 1.86 °C/m * 6.36 mol/kg = 11.8 °C

To find the freezing point of the solution, subtract the freezing point depression from the freezing point of pure water (0 °C):

Freezing point = 0 °C - 11.8 °C = -11.8 °C

To determine the boiling point of the solution, we can use the equation:

ΔTb = Kb * m

where:

ΔTb is the boiling point elevation,

Kb is the ebullioscopic constant (for water, Kb = 0.52 °C/m),

m is the molality of the solution (same value as calculated before: 6.36 mol/kg).

ΔTb = 0.52 °C/m * 6.36 mol/kg = 3.31 °C

To find the boiling point of the solution, add the boiling point elevation to the boiling point of pure water (100 °C):

Boiling point = 100 °C + 3.31 °C = 103.31 °C

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Camouflage is not a general adaptation which is therefore denoted as option A.

This is referred to as any heritable trait that helps an organism, such as a plant or animal, survive and reproduce in its environment.

It is also called cryptic coloration, is a defense or tactic that organisms use to disguise their appearance, usually to blend in with their surroundings. Organisms use camouflage to mask their location, identity, and movement and it used by most prey to avoid predators, and for predators to sneak up on prey.

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The property of water that allows it to dissolve many substances is its polarity.

What is polarity?

Polarity refers to the distribution of electrical charge in a molecule. A polar molecule has an uneven distribution of electrons, resulting in a partial positive charge on one end of the molecule and a partial negative charge on the other end. This creates a dipole moment in the molecule.

Water molecules are polar, meaning that the electrons in the molecule are not distributed evenly, resulting in a partial positive charge on one end of the molecule and a partial negative charge on the other end.

This polarity allows water molecules to form hydrogen bonds with other polar or charged molecules, such as ions and polar compounds. This type of bonding allows many substances, such as salt and sugar, to dissolve in water.

Additionally, the polarity of water molecules also allows them to interact with nonpolar substances through London Dispersion Forces, which also allows some nonpolar substances to be dissolved in water.

Hence, the polarity of water allows it to dissolve many substances.

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The bond order for a second-period diatomic particle containing five electrons in antibonding molecular orbitals and eight electrons in bonding molecular orbitals is 1.5

Bond order is defined as the number of electrons in bonding molecular orbitals minus the number of electrons in antibonding molecular orbitals divided by two. As a result, we may determine the bond order of this diatomic particle by the formula: Bond order = (number of bonding electrons - number of antibonding electrons) / 2

Bond order = (8 - 5) / 2

Bond order = 1.5.

This diatomic molecule, according to the bond order, is a stable molecule since the bond order is greater than 1, indicating that it is a double bond. The molecule has an overall bond strength that is greater than a single bond, but not as strong as a triple bond. So therefore he bond order for a second-period diatomic particle containing five electrons in antibonding molecular orbitals and eight electrons in bonding molecular orbitals is 1.5

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Different applications for magnesium oxide exist. As an antacid, some individuals take it to treat acid indigestion, sour stomach, and heartburn. In order to quickly and temporarily clear the bowels.

As a naturally occurring form of periclase, magnesium oxide (MgO), often known as magnesia, is a white hygroscopic solid mineral (see also oxide). MgO is its empirical formula, and it is made up of a lattice of Mg2+ and O2 ions that are bound together by ionic bonding. Magnesium hydroxide is created when magnesium and water are present (MgO + H2O Mg(OH)2), although this reaction may be stopped by heating the solution to eliminate the moisture.

Magnesium oxide was once referred to as magnesia alba, or the "white mineral from Magnesia," to distinguish it from the "black mineral," or "magnesia Negra," which included what is now recognized as manganese.

The chemical magnesium peroxide, commonly known as MgO2, is also known as "magnesium oxide," although the term often refers to MgO. MgO2 is thermodynamically stable, according to evolutionary crystal structure prediction.

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1. The C in the first structure should have four total valence electrons. To complete its octet, it thus requires 4 extra electrons. The molecule should thus have 8 + 2 = 10 valence electrons overall, yet 14 valence electrons are present in this configuration. Thus, this is not the proper Lewis structure.

2. While both elements' octets are full in the second form, the total valence electron is incorrect. Total valence electrons should be =7+6+1=14, with 7 coming from the 7 valence electrons of a Cl atom, 6 from the 6 valence electrons of O, and 1 from the negative charge. Yet, there are a total of 8 + 4 = 12 electrons in the structure, where 8 is for 4 lone pairs of electrons and 4 is from the double bond. Thus, it is likewise an improper Lewis structure.

3. The valence electron count in the N2 molecule, the third structure, is accurate. The N atom, however, has not yet reached octet. There are 6 electrons in each N. The two N atoms do not thus have an octet arrangement. Thus, it is not a valid Lewis structure.

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The two elements have the same number of dots around their chemical symbols in their electron dot diagrams are: (C). P and As

Chemical symbol can be defined as a representation of an element using letters.

Chemical symbol are given to each element distinctively and this is an easier way to represent an element.

Some examples of chemical symbols are; O for oxygen, Zn for zinc, and Fe for iron etc.

In conclusion, The two elements have the same number of dots around their chemical symbols in their electron dot diagrams are: (C). P and As

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Apollo boasted to Cupid about how much larger his bow was. Apollo was offended, and Cupid hit him with a golden love arrow in retaliation, leading him to fall in love with the first person he saw.

Who was punished by Apollo for having a human lover?

Daphne, in her effort to escape him, was changed into a laurel, his sacred tree; Coronis was shot by Apollo's twin, Artemis, when she proved unfaithful; and Cassandra rejected his advances and was punished by being made to utter true prophecies that no one believed.5 days ago

Apollo unexpectedly advised Eros to leave warlike weapons to powerful gods like him and stick to magic instead after defeating Python, a terrible earth-dragon that lived near Delphi.

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The correct chemical formula for diphosphorous pentoxide is P₄O₁₀.

This compound is formed from the reaction of two molecules of phosphorus trioxide (P₂O₃). The prefix "di" indicates that there are two phosphorus atoms, and the suffix "-pentoxide" indicates that there are five oxygen atoms. The formula can also be written as (P₂O₅)₂, which represents the two P₂O₅ units that combine to form the molecule.

Diphosphorous pentoxide is a white, crystalline solid that is used as a dehydrating agent and in the production of phosphoric acid and other phosphorus compounds. It reacts violently with water, producing phosphoric acid and releasing heat, so it must be handled with care.

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The entropy change of the universe is zero, which is consistent with the second law of thermodynamics. Therefore, the entropy of the universe remains constant or the change in entropy is zero.

Answer:AScoffee = -1.71 J/K, ASroom = 1.71 J/K, ASuniverse = 0.

According to the second law of thermodynamics, entropy of an isolated system always increases. In the given question, we need to calculate the entropy change of coffee, room, and universe. Let's solve this problem.

Given: Mass of coffee = 170 g (density of water = 1 g/cm³)

Specific heat of coffee = specific heat of water = 4.18 J/(g·°C)

Temperature of coffee = 88°C

Temperature of room = 20°C

The initial temperature of coffee = 88°C

The final temperature of coffee = 20°C

Change in temperature of coffee (ΔT) = final temperature - initial temperature = 20°C - 88°C = -68°C

Let's calculate the entropy change of coffee. Entropy change of coffee:

AScoffee = -[170 g/(1000 g/1 kg)](4.18 J/(g·°C))ln[(20°C + 273 K)/(88°C + 273 K)]

AScoffee = -[0.17 kg](4.18 J/(g·°C))ln(293 K/361 K)

AScoffee = -1.71 J/K

Now, let's calculate the entropy change of the room. The change in entropy of the room would be equal and opposite to the change in entropy of coffee (based on the principle of energy conservation).

ASroom = -AScoffeeASroom = 1.71 J/K

The entropy change of the universe would be the sum of entropy change of coffee and entropy change of the room.

ASuniverse = AScoffee + ASroomASuniverse = -1.71 J/K + 1.71 J/KA

Suniverse = 0

The entropy change of the universe is zero, which is consistent with the second law of thermodynamics. Therefore, the entropy of the universe remains constant or the change in entropy is zero.

Answer:AScoffee = -1.71 J/K, ASroom = 1.71 J/K, ASuniverse = 0.

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Answer:

False

Explanation:

The air masses are not responsible for weather , it is cause by the Earth evolution

The law of conservation of  mass is obeyed by a balanced chemical equation. The number of moles of KCl produced from 4K is 4KCl.

An equation in which the amount of the reactants and products on both sides of the reaction are equal is defined as the balanced chemical equation. In a balanced equation the number of atoms of each element is same on both sides.

According to the law of conservation of mass, mass can neither be created nor be destroyed. All the balanced chemical equation satisfies this law.

Here when 4K is used the amount of KCl produced is given as:

4K + 2Cl₂ → 4KCl

Here there are 4 'K' atoms and 4 'Cl' atoms. Hence the number of the respective atoms are equal on both sides of the equation.

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HNO3 and HBr can also be used instead of the provided acids (h2so4 and h3po4) to isolate solid copper in this experiment. Solid copper can be isolated by reacting it with acid. This is achieved in two stages: stage one, where copper reacts with sulfuric acid to produce copper sulfate and hydrogen gas, and stage two, where copper sulfate is reduced to copper using hydrogen gas.  

Therefore, in part b of the experiment, H2SO4 and H3PO4 are used. HNO3 and HBr can also be used instead of H2SO4 and H3PO4 to isolate solid copper. H2S and H2CO3 cannot be used as the acids to isolate solid copper. 'Hence, the correct options are : HNO3 and HBr Therefore, both HBr and HNO3 could be used in place of the acids (H2SO4 and H3PO4) to isolate solid copper in part b of this experiment.

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A complex is a compound that is composed of a central metal atom/ion and then ligands.   MnO4- is a d^0 specie hence it has no d electron.

A complex is a compound that is composed of a central metal atom/ion and then ligands. These ligands may lead to the color of the complex. However, the color of complexes more commonly result from the d-orbital transition in the metal atom/ion.

Now we know that the neutral electron configuration of Mn is [Ar]. 3d5. 4s2. It then follows that MnO4- is a d^0 specie hence it has no d electron.

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Answer:

30 % m/V o 23 % m/m

Explanation:

Al leer el problema y entender el enunciado como que se usó suficiente cantidad de agua para obtener 100 mL, con la masa de LiOH podemos determinar la concentración en m/V.

m/V es una concentración que establece la relación de gramos de soluto en 100 mL de solución.

Como los gramos de soluto son 30g, la concentración en m/V es

30/100 = 0.3 % m/V

Podemos también establecer concentración m/m la cual establece la relación como masa de soluto en 100 g de solución. Como el volumen de solución coincide con el de solvente, la masa de solución la podemos obtener sumando masa de solvente + masa de soluto

30 g + 100 g = 130 g

Si tomamos el agua como solvente puro, y por densidad (1 g/mL) la masa de agua es 100g

Así el % m/m lo calculamos como (masa de soluto/masa solucion) . 100

(30g  / 130g) . 100 = 23 % m/m