What sort of bond would you expect the following two atoms to have together?
iodine (I) and iodine (1)
O Polar covalent bond
O lonic bond
O Nonpolar covalent bond

Answer:

The pH of the solution formed is approximately 12.614.

Explanation:

First, we need to calculate the molarity of the Ba(OH)₂ solution:

moles of Ba(OH)₂ = mass / molar mass = 3.470 g / (137.327 g/mol + 2*15.9994 g/mol) = 0.01156 mol

molarity = moles / volume = 0.01156 mol / 0.5631 L = 0.02055 M

Ba(OH)₂ is a strong base, and it will dissociate completely in water to give two OH⁻ ions for every Ba(OH)₂ molecule:

Ba(OH)₂ → Ba²⁺ + 2OH⁻

So the concentration of OH⁻ ions in the solution is 2 * 0.02055 M = 0.0411 M.

Now we can use the equation for the ion product constant of water to calculate the pH of the solution:

Kw = [H⁺][OH⁻] = 1.0 x 10⁻¹⁴

pH + pOH = 14.00

pOH = -log[OH⁻] = -log(0.0411) = 1.386

pH = 14.00 - pOH = 14.00 - 1.386 = 12.614

Therefore, the pH of the solution formed is approximately 12.614.

Answer

449.4 grams

Explanation

The balanced chemical equation of the reaction is;

From the balanced chemical equation;

3 moles of H₂ reacted with 1 mole of N₂ to produce 2 moles of NH₃

Molar mass of H₂ = 2.016 g/mol

Molar mass of N₂ = 28.0134 g/mol

Molar mass of NH₃ = 17.031 g/mol

Convert mole to gram using the formula;

For 1 mole N₂

For 3 moles H₂

For 2 moles NH₃

We can now calculate, the mass of NH₃ that can be produced from 79.8 grams of H₂ as follows:

From the balanced equation we can say;

6.048 grams H₂ → 34.062 grams NH₃

∴ 79.8 grams H₂ → x grams NH₃

Therefore, 449.4 grams of Ammonia is produced if you started with 79.8 grams of Hydrogen.

In the given reaction, the equilibrium shifts towards reagents side.

Equilibrium constant is known as Kc = [products]/[reactants]  raised to the power of their number of moles in the balanced reaction.

When we have a system at equilibrium with Kc < 1, it means [products] < [reagents] and the system needs energy to react, so if you decrease temperature the equilibrium shifts towards reagents and less products will be created.

This effect can be described with Van´t Hoff equation:

ln(K₁/K₂)= -dH/R (1/T₁ -1/T₂)  where we can see that if we decrease temperature (this is T2<T1) in consecuense K2<K1 and reaction doesn´t happen.

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The complete question should be

The equilibrium reaction below has the Kc = 0.254 at 25°C. If the temperature of the system at equilibrium is decreased to 0°C, how and for what reason will the equilibrium shift? Also show and explain how and why the Kc value will change.

Answer:

The Lydia Bourouiba is recorded is around more than the 100 sneezes and coughs cases.

Explanation:

Lydia Bouroubia was a mathematical physicist who does experiments on sneezes and coughs. She was a leading expert in coughs and sneezes. Sneezing is a phenomenal activity that occurs in our body to excrete the dust particles and germs.

The disease also spread through it. Lydia thought that her research will help people related to their health. It will help in stopping epidemics in public. It is a type of outbreak of disease at a bigger level in the public.

Among the given nuclides, 5826Fe, 6027Co, 9241Nb, mercury-202, and radium-226, you can expect 9241Nb and radium-226 to be radioactive.

Radioactive nuclides are unstable isotopes that undergo radioactive decay, emitting radiation in the form of particles or electromagnetic waves. 9241Nb, or niobium-92, is an unstable isotope with a half-life of around 35 million years. It decays through beta decay, emitting an electron and an antineutrino. Radium-226 is an isotope of radium that is highly radioactive and unstable, with a half-life of 1,600 years. It decays through alpha decay, releasing alpha particles and transforming into radon-222. In contrast, 5826Fe (iron-58), 6027Co (cobalt-60), and mercury-202 are either stable or have very long half-lives, making them less likely to be considered significantly radioactive under normal conditions.

Any nuclide that doesn't experience radioactive decay is said to be stable. We take into account the neutron to proton ratio (N/Z ratio) and the presence of magic numbers (stable proton/neutron counts) in order to estimate the stability of a nuclide. We have three nuclides in your question: 48K, 79Br, and Argon-32. Potassium-48 (48K) has 29 neutrons and 19 protons. The ratio of N to Z is roughly 1.53. Due to its high N/Z ratio and absence of magic numbers, this nuclide is unstable. Bromine-79 (79Br) contains 44 neutrons and 35 protons. In general, the N/Z ratio is 1.26. This nuclide is stable because its N/Z ratio is balanced and its neutron count is relatively near to the critical value of 50.

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If instead of a strip of pure magnesium ribbon, a strip of an aluminum-magnesium alloy is given, the mass of the strip would be higher than expected. This is because the alloy contains both aluminum and magnesium which are less dense than pure magnesium.

The chemical equation for the reaction of pure magnesium with hydrochloric acid is:
\(Mg + 2HCl → MgCl2 + H2\)
The reaction shows that one mole of magnesium reacts with two moles of hydrochloric acid to produce one mole of magnesium chloride and one mole of hydrogen gas. The molar mass of magnesium is 24.31 g/mol.
On the other hand, the chemical equation for the reaction of aluminum-magnesium alloy with hydrochloric acid is:
AlxMg1-x + 2HCl → AlxMg1-xCl2 + H2
The reaction shows that one mole of the alloy reacts with two moles of hydrochloric acid to produce one mole of the alloy chloride and one mole of hydrogen gas. The molar mass of the alloy would depend on the ratio of aluminum to magnesium in the alloy.
Since aluminum has a lower density than magnesium, the overall density of the aluminum-magnesium alloy is lower than that of pure magnesium. Therefore, for the same volume of material, the mass of the aluminum-magnesium alloy strip would be higher than that of the pure magnesium strip. However, the actual mass of the aluminum-magnesium alloy strip would depend on the specific ratio of aluminum to magnesium in the alloy.

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Answer:

a. 0.02 moles  of NH₃, 0 moles of O₂, 0.08 moles of NO, 0.12 moles of H₂O

b. \(P_{NH_3}\) = 12,576.5 Pa, \(P_{NO}\) = 50,306.05 Pa, \(P_{H_2O}\) =  74,459.1 Pa

c. The total pressure is 138,341.64 Pa

Explanation:

a. NH₃ + O₂  → NO + H₂O

The balanced chemical equation is first found to be

4NH₃ + 5O₂  → 4NO + 6H₂O

Therefore, we have;

4 moles of NH₃ reacts with 5 moles of O₂ to form 4 moles of NO and 6 moles H₂O

Dividing by the reactant with the highest number of moles which is 5 moles of oxygen gives;

4/5 moles  of NH₃ reacts with 5/5 moles of O₂ to form 4/5 moles of NO and 6/5 moles H₂O

Which is the same as 4/5 moles  of NH₃ reacts with 1 mole of O₂ to form 4/5 moles of NO and 6/5 moles H₂O

Multiplying by 0.100 gives;

0.1×4/5 moles  of NH₃ reacts with 0.1 mole of O₂ to form 0.1×4/5 moles of NO and 0.1×6/5 moles H₂O

The quantity of each gas in the container upon completion of the reaction is therefore;

(0.1 - 0.1×4/5) = 0.02 moles  of NH₃

0 moles of O₂

0.08 moles of NO

0.12 moles H₂O

b. Given that the temperature = 105°C, we have;

PV = nRT

P = nRT/V

Where:

n = Total number of moles = 0.02 + 0.08 + 0.12 = 0.22 moles

R = Universal gas constant = 8.3145 J/(mol·K)

T = Temperature = 105°C = 378.15 K

V = Volume = 5 litre = 0.005 m³

P = 0.22×8.3145×378.15/0.005 = 138,341.64 Pa

From Dalton's law of partial pressure, we have;

Partial pressure Pₓ = Xₓ × P

Where:

Xₓ = Mole fraction

Which gives for ammonia NH₃ with 0.02 moles;

Mole fraction = 0.02/0.22 = 1/11

\(P_{NH_3}\) = 1/11 × 138,341.64  = 12,576.5 Pa

For the 0.08 moles of NO, we have

Mole fraction = 0.08/0.22 = 4/11

\(P_{NO}\) = 4/11 × 138,341.64  = 50,306.05 Pa

For the 0.12 moles H₂O

P = 0.12×8.3145×378.15/0.005 = 74,459.1 Pa

Mole fraction = 0.12/0.22 = 6/11

\(P_{H_2O}\) = 6/11 × 138,341.64  = 74,459.1 Pa

c. The total pressure = 12,576.5 Pa + 50,306.05 Pa + 74,459.1 Pa = 138,341.64 Pa.

Answer:

The correct answer is B. 1-propanamine.

Explanation:

Amines can form hydrogen bonds with water molecules, which makes them soluble in water. The more hydrogen bonding sites an amine has, the more soluble it will be in water.

Out of the given options, 1-propanamine has only one carbon chain, which allows it to form more hydrogen bonds with water molecules compared to amine molecules with longer carbon chains. Also, it does not have any other functional groups that could interfere with hydrogen bonding. Therefore, 1-propanamine would be the most soluble in water.

Hope it helps!

Answer:

Is there answer choices?

Explanation:

Acidic: FeCl₂, Fe(OH)₃; Neutral: NaCl, BF₃; Basic: CaO, CaBr₂, Na₂S, LiClO₄, CoBr₃.


When dissolved in water, certain salts can either produce acidic, neutral, or basic solutions. Acidic salts release hydrogen ions (H⁺) in water, neutral salts neither release nor accept H⁺ ions, and basic salts release hydroxide ions (OH⁻) in water.  

From the given salts, FeCl₂ and Fe(OH)₃ are acidic because they produce H+ ions in water. NaCl and BF₃ are neutral because they do not release or accept H+ ions. CaO, CaBr₂, Na₂S, LiClO₄, and CoBr₃ are basic because they release OH⁻ ions in water.  

It is important to note that some salts can have amphoteric properties, meaning they can act as both acidic and basic depending on the surrounding conditions. However, none of the given salts display amphoteric behavior.

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1. 2Al(s)+6HCl(aq)⇒2AlCl₃(aq)+3H₂(g)

2. 2AgNO₃ (aq) + Cu (s)⇒Cu(NO₃)₂ (aq) + 2Ag (s)

3. 2C₃H₈O(l) + 9O₂(g) ⇒ 6CO₂(g) + 8H₂O(g)

There are several reactions that can occur in a chemical reaction: single replacement, double replacement, synthesis, decomposition or combustion, etc.

1.Al(s)+HCl(aq)⇒AlCl₃(aq)+H₂(g)

type : single replacement

balance :

2Al(s)+6HCl(aq)⇒2AlCl₃(aq)+3H₂(g)

2. AgNO₃ (aq) + Cu (s) ⇒ Cu(NO₃)₂ (aq) + Ag (s)

type : single replacement

balance :

2AgNO₃ (aq) + Cu (s)⇒Cu(NO₃)₂ (aq) + 2Ag (s)

3. C₃H₈O + O₂ ⇒ CO₂ + H₂O

type : combustion of alcohol

balance :

2C₃H₈O(l) + 9O₂(g) ⇒ 6CO₂(g) + 8H₂O(g)

If water molecules did not have a slight negative charge on one end and a slight positive charge on the other then Water would be incapable of freezing or boiling.

Water is an inorganic polar chemical. At room temperature, it is an odorless and tasteless liquid with a tinge of blue. This most basic hydrogen chalcogenide is unquestionably the most researched chemical compound and therefore is known as that of the "universal solvent" due to its propensity to dissolve a wide range of compounds.

If water molecules did not have a slight negative charge on one end and a slight positive charge on the other then Water would be incapable of freezing or boiling.

Therefore, water would be incapable of freezing or boiling.

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Tetrahedral voids

Octahedral voids

A higher effective nuclear charge causes greater attractions to the electrons, pulling the electron cloud closer to the nucleus which results silicon have  smaller atomic radius than TIn.

These elements are: how many protons are in the nucleus (called the nuclear charge). the number of electron-carrying energy levels (and the number of electrons in the outer energy level). a measure of how many electrons are kept between the nucleus and its outermost electrons (called the shielding effect).

The distance between an atom's nucleus and its outermost, or valence, electrons is known as the atomic radius of an element. As you proceed around the periodic table, the value of the atomic radius varies in predictable ways. The interaction between the positive charge of the atom's protons in the nucleus and the negative charge of all of its electrons results in these alterations.

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Explanation:

Aight, I'mma give tell ya an easy way for this question. look at this Forumla

M=

\( \frac{10ad}{m} \)

a explains the percentage of aqueous solution

d is the density

m is the molar mass

right, let's just hop to it

M=10×28×1.25/11.5====> M=30.43

Answer:

Explanation:

1 standard deviation range will look like: [average - SD, average + SD]

Here the miximum value will be: average - SD = 2.6 - 0.80 = 1.80 ml

and the maximum value will be: average + SD = 2.6 + 0.80 = 3.40ml

Answer:

According to the Dalton's theory, the description of water molecule is that;

-Water molecules are made of two different kinds of atoms (hydrogen and oxygen atoms).

-All water molecules have twice as many hydrogen atoms as oxygen atoms.

-All water molecules have one oxygen atom for every two hydrogen atoms.

Explanation:

got a 100% on edge

Answer:

35.62%

Mass percent composition of K = 0.3562 x 100% Mass percent composition of K = 35.62%

Explanation:

The phrases that applied to molecular compounds are often gases and liquids, which have low melting points and and use covalent bonding. So. options (b), (c) and (e) are correct.

Molecular compounds are defined as the chemical compounds that take the form of discrete molecules. The molecular compounds are very different from ionic compounds like sodium chloride. These compounds are held together by covalent bonds. Molecular compounds are usually gases and liquids at room temperature due to their low melting and boiling points. Some molecular compounds are solids at room temperature but they tend to be soft and flexible. The boiling points of these compounds are also low due to weak intermolecular forces because it does not take that much energy to separate and vaporize the molecular molecules.

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Answer:

2.38x10²³ atoms oxygen

Explanation:

To solve this question we need to convert the mass of sand to moles using its molar mass (Molar mass SiO₂ = 60.08g/mol). Twice these moles are the moles of Oxygen and using Avogadro's number we can find the amount of atoms of Oxygen in the mixture:

Moles SiO₂:

11.87g * (1mol / 60.08g) = 0.1976moles SiO₂

Moles Oxygen:

0.1976moles SiO₂* 2 = 0.3951moles oxygen

Atoms oxygen:

0.3951moles oxygen * (6.022x10²³atoms / 1mol O₂) =

The quantum principle number (n) for an electron in a Bohr hydrogen atom with energy -1.362x10^-19 J is 4, calculated using the equation -13.6 eV/n^2 and converting the given energy to -0.85 eV.

The energy of an electron in a hydrogen atom can be calculated using the formula:
E = (-13.6 eV) / n^2
where E is the energy of the electron in electron volts (eV) and n is the quantum principle number.
To convert the given energy from joules (J) to eV, we can use the conversion factor:
1 eV = 1.602 x 10^-19 J
Thus, the energy of the electron in eV is:
-1.362 x 10^-19 J / (1.602 x 10^-19 J/eV) = -0.85 eV
Substituting this value of energy into the above equation, we can solve for n:
-0.85 eV = (-13.6 eV) / n^2
n^2 = 16
n = 4
Therefore, the value of n (quantum principle number) for the electron in the Bohr hydrogen atom with an energy of -1.362x10^-19 J is 4.

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(a) Paper burning with a bright flame is an exothermic reaction.

(b) Plastics becoming brittle after being left in the sun is an endothermic reaction.

(c) A firecracker exploding is an exothermic reaction.

Exothermic reactions are those that release energy in the form of heat or light. In the case of paper burning, the energy stored in the paper's chemical bonds is released as heat and light, making it an exothermic reaction.

Endothermic reactions are those that absorb energy from the surroundings, causing the temperature to decrease. Plastics becoming brittle after being left in the sun is an endothermic reaction because the energy from the sun is absorbed by the plastic, causing it to break down and become brittle.

An exothermic reaction occurs when energy is released in the form of heat or light, which is what happens when a firecracker explodes. The chemicals inside the firecracker react with each other, releasing energy in the form of heat and light, which creates the loud bang and the explosion.

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As a result, the solution's freezing point is -2.28 °C.

When a substance freezes, it changes from a liquid state to a solid state. When a material switches from one state of matter to another, this phenomenon is known as a phase transition.

To calculate the freezing point of the solution, we need to use the freezing point depression equation:

ΔTf = Kf × m

Calculate the moles of glucose:

molar mass of glucose (C6H12O6) = 6(12.01) + 12(1.01) + 6(16.00) = 180.18 g/mol

moles of glucose = 27.56 g / 180.18 g/mol = 0.153 moles

Calculate the mass of water:

water mass is 125 gram

Calculate the molality of the solution:

Solvent mass: 125 g/1000 = 0.125 kilogramme

molality = 0.153 moles / 0.125 kg = 1.224 mol/kg

ΔTf = Kf × m = 1.86 °C/m × 1.224 mol/kg = 2.28 °

freezing point of solution = 0 °C - 2.28 °C = -2.28 °C

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Answer:

2

3

Explanation:

To infer the last energy of the given atoms, we need to write their electronic configuration:

For N = 1S² 2S² 2P³

     Mg  = 1S² 2S² 2P⁶ 3S²  

The energy levels are usually designated as;

   n = 1

   n = 2

   n = 3

   n =4

For N, the last energy level is 2

     Mg, the last energy level is 3

We can also determine this number by the periods the atoms can be found.

Electronegativity

The tendency of an atom to pull electrons towards itself is called electronegativity.

It is the tendency of an atom to attract bonding pair of electrons towards itself. These atoms which are more electronegative are able to bear a negative charge and be stable.

Unlike electropositive elements which tend to lose electrons , electronegative elements hold on tightly to the electrons.

The electronegativity is measured using the Pauling Scale where the most electronegative element of the periodic table, Fluorine , is given a value of 4 and the rest of the elements have values lower than 4 according to the trends followed by their groups and periods.

The least electronegative element of the periodic table , Cesium has a value of 0.7 on the Pauling Scale.

Electronegativity increases when we move from left to right in the periodic table and it decreases (in general) when we move down the group.

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Answer:

If there were multiple products, we can take each product and mixed with a sample of a pure compound that we suspect might be the same as the product. Then, we taking the melting point of this mixture that contains one of our product and pure sample. Then, we can observe the change in melting point, if there is no change in melting point or the melting stays in the same range of the pure compound. Then, the that product along with the pure sample are actually the same compound, not a mixture of two compounds. However, if the melting point for our pure sample compound changed or didn't stay in the same range after the mixing with on of our products. then we can conclude that this product and the pure sample are completely different compound, and indeed they are a mixture.

Answer: a) Gases are not at all rigid.

Explanation: Gases are composed of particles that are in constant random motion, and they do not have fixed positions. Gases do not have a definite shape or volume. They exhibit high compressibility. When we apply pressure to a gas, the molecules close in on each other, reducing the volume of the gas.

Gases can expand due to the free movement of gas molecules, which allows them to take on any shape based on the container, thus filling the container's volume. Thus, gases can expand to fill the containers.

Gases have no fixed volume or shape in the gaseous state. The gaseous pressure is caused by collision of molecules on the container walls. Therefore, gases don't have particles in fixed positions.

Gases have lower density as compared to solid and liquid. Gas particles move randomly against each other, with no fixed position due to their low density. The molecules  are separated by large distance. their collision has no effect on their movement. Thus, Gas have low density.

Therefore from all above options, a is the correct answer.

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Answer:

An alkaline solution is another name for a solution that is basic. All alkali metals react readily with water to produce the metal hydroxide and hydrogen gas. The resulting solutions are basic.

An alkaline solution is another name for a solution that is base. All alkali metals react readily with water to produce the metal hydroxide and hydrogen gas. The resulting solutions are basic.

According to the Arrhenius concept, base is defined as a substance which yields hydroxyl ions on dissociation.These ions react with the hydrogen ions of acids to produce salt in an acid-base reaction.

Bases have a pH higher than seven as they yield hydroxyl ions on dissociation.They are soapy in touch and have a bitter taste.According to the Lowry-Bronsted concept, base is defined as a substance which accepts protons .Base react violently with acids to produce salts .Aqueous solutions of bases can be used to conduct electricity .They can also be used as indicators in acid-base titrations.

They are used in the manufacture of soaps,paper, bleaching powder.Calcium hydroxide ,a base is used to clean sulfur dioxide gas while magnesium hydroxide can be used as an antacid to cure acidity.

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