What's a fear, concern, or worry you have? How can you best prepare to tackle this obstacle? (Write 2 to 3 complete sentences) ¿Qué miedo, preocupación o preocupación tienes? ¿Cómo puedes prepararte mejor para enfrentar este obstáculo? (Escribe de 2 a 3 oraciones completas)


Ayuda plis.​

From the solution that we have in the question;

The equilibrium constant, denoted as K, is a value that quantitatively represents the ratio of the concentrations of products to reactants at equilibrium in a chemical reaction.

It is a fundamental concept in chemical equilibrium.

The value of the equilibrium constant provides valuable information about the position of equilibrium and the relative concentrations of species involved in a chemical reaction.

Kc = [X] [Y]/[XY]

\(0.25 = (0.1 + x)^2/(0.5 - x)\)

\(0.25(0.5 - x) = (0.1 + x)^2\)

\(0.125 - 0.25x =0.01 + 0.2x + x^2\\ x^2 + 0.45x - 0.115 = 0\)

x = 0.18 M

The equilibrium amount of X and Y=  0.28 M and the equilibrium concentration of XY = 0.32 M

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Based on the answer to the question that we have;

The ratio of the product to reactant concentrations in a chemical reaction at equilibrium is represented quantitatively by the equilibrium constant, abbreviated as K.

It is a cornerstone of the theory of chemical equilibrium.

A chemical reaction's equilibrium position and the relative concentrations of the species involved can both be learned from the equilibrium constant's value.

Kc = [X][Y]/[XY]

\(0.25 = (0.1 + x)^2/(0.5 - x)\\0.25(0.5 - x) = (0.1 +x)^2\\0.125 - 0.25x = 0.01 +0.2x +x^2\\= 0.18 M\)

The equilibrium concentration of;

XY =0.5 - 0.18

=0.32 M

Then the equilibrium amount of

X and Y is

0.1 + 0.18= 0.28 M.

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The balanced equation for the redox reaction between zinc and hydrochloric acid (HCl) that forms zinc(II) ions and hydrogen gas is as follows:

Zn(s) + 2H+(aq) → Zn2+(aq) + H2(g)

A redox reaction is a type of chemical reaction in which some of the atoms have their oxidation number changed.

According to this question, the redox reaction between zinc and hydrochloric acid (HCl) forms zinc(II) ions and hydrogen gas. The balanced equation is as follows:

Zn(s) + 2H+(aq) → Zn2+(aq) + H2(g)

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6.67 kJ of heat is required to melt 20 grams of ice.  To calculate the amount of heat required to melt a certain amount of ice.

we need to use the formula:

Q = n * ΔH_fus

where Q is the amount of heat required, n is the number of moles of ice, and ΔH_fus is the heat of fusion of ice.

To find the number of moles of ice in 20 grams, we need to divide the mass by the molar mass of ice. The molar mass of water is 18.015 g/mol.

n = m / M = 20 g / 18.015 g/mol = 1.110 mol

Now we can use the formula above to calculate the amount of heat required:

Q = n * ΔH_fus = 1.110 mol * 6.01 kJ/mol = 6.67 kJ

Therefore, 6.67 kJ of heat is required to melt 20 grams of ice.

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Answer:

The answer to this question is 33.8

0.11M is the concentration of a solution made by dissolving 6.5 g of CaCl\(_2\) in 0.50L of water

Concentration in chemistry is calculated by dividing a constituent's abundance by the mixture's total volume. Mass concentration, concentration in moles, numerical concentration, & volume concentration are four different categories of mathematical description.

Any type of chemical mixture can be referred to by the term "concentration," however solvents and solutes in solutions are most usually mentioned. There are different types of molar (quantity) concentration, including normal concentration or osmotic concentration.

Molarity = number of moles/ volume of solution in liter

number of moles = 6.5/ 110.9= 0.05moles

Molarity =0.05/0.50=0.11M

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Answer:

C

Explanation:

Solids do not take the shape of the container. That have definite shapes. Liquid and gas take the Shape of the containers

Answer:

C, Carbon

Explanation:

Write the symbol for every chemical element that has atomic number greater than 6 and atomic mass less than 25.2 u.

Answer:

12.69g

Explanation:

as you see in the equation the number of moles for zinc hydroxide is same the water so,

0.705=mass\18mol g^-1

mass of water    = 12.69g

hope is helpful

Answer:

A

Explanation:

Each DNA sequence that contains instructions to make a protein is known as a gene. The size of a gene may vary greatly, ranging from about 1,000 bases to 1 million bases in humans.

Answer:

true

Explanation:

The balanced chemical equations using suitable coefficients are  Zn₃(PO₄)₂+ 2 AlCl₃ → 3 ZnCl₂ + 2 Al(PO₄),2 Cr(OH)₃ → Cr₂O₃ +3 H₂O,3 NaOH+ H₃PO₄ → Na₃PO₄+ 3 H₂O,2 Li + 2 H₂O → 2 LiOH+ H₂.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

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Answer:

C. 12.5 m/s

Explanation:

h = h(0) - gt²/2

0 m = 8 m - 9.8 m/s²*t²/2

- 8 m = - 9.8 m/s²*t²/2

16 m = 9.8 m/s² * t²

t² = 16/9.8 s²

t = √(16/9.8) s

v = v(0) + gt

v = 0 +gt

v = 9.8 m/s² * √(16/9.8) s ≈ 12.5 m/s

Answer &

Explanation:

eukaryotic: Having complex cells in which the genetic material is contained within membrane-bound nuclei. cell: The basic unit of a living organism, consisting of a quantity of protoplasm surrounded by a cell membrane, which is able to synthesize proteins and replicate itself.

therefore it is cell

The question is incomplete, the complete question is;

Using the following equation 2 NaOH(aq) + H2SO4(aq) → 2 H2O(aq) + Na2SO4(aq) how many grams of sodium sulfate will be formed if you start with 200 grams of sodium hydroxide and you have an excess of sulfuric acid

Answer:

355.1 g

Explanation:

The equation of the reaction is;

2 NaOH(aq) + H2SO4(aq) → 2 H2O(aq) + Na2SO4(aq)

We have been told that H2SO4 is in excess so NaOH is the limiting reactant. Therefore;

Number of moles in 200g of NaOH = 200g/40g/mol = 5 moles

So;

2 moles of NaOH yields 1 mole of Na2SO4

5 moles of NaOH will yield 5 * 1/2 = 2.5 moles of Na2SO4

Molar mass of Na2SO4 = 142.04 g/mol

Mass of Na2SO4= 2.5 moles * 142.04 g/mol = 355.1 g

Answer:

Explanation:

Part A

Balancing means that the same number of elements on one side of the equation must be the same as the number of elements on the other side.

You need 3 carbons on the right side because right now there is only one. Try putting a 3 in front of the CO2 and see if the oxygens come into balance as well.

Al2(CO3)3 ⟶ Al2O3 + ___CO2

Al2(CO3)3 ⟶ Al2O3 + 3CO2

Balance check

Element                Left           Right

Al                            2                2

Carbon(C)              3                3

Oxygen                  9               3 + 6 = 9

And it is balanced.

Part B

It's a decomposition of some kind. Two smaller molecules are created from one larger one.

Answer:

Explain the difference between total and average molecular kinetic energy of a gas contained in a box. As an average K.E. of the particles increases, the object's temperature increases. Total Kinetic Energy is the sum of energy. Explain how a liquid thermometer measure temperature.

The total kinetic energy of a body or a system is equal to the sum of the kinetic energies resulting from each type of motion.

Answer: There are 1.20 x 1024 atoms of sodium in 2 moles

Explanation:

Answer:

m = 31.284 grams

Explanation:

Given that,

The dimension of a magnesium block is 2.00 cm  x 3.00 cm x 3.00 cm.

The density of magnesium is, d = 1.738 g/cm³

We need to find the mass of the magnesium block. We know that the density of an object is given by its mass per unit its volume. So,

\(d=\dfrac{m}{V}\\\\\text{Where m=mass}\\\\m=d\times V\\\\m=1.738\ g/cm^3\times (2\times 3\times 3)\ cm^3\\\\m=31.284\ \text{grams}\)

So, the mass of the block is 31.284 grams.

The mass of a magnesium block is 31.284 grams.

\(Density = mass \div volume\\\\ Mass = Density \times volume\\\\ = 1.738 \times ( 2.00 cm \times 3.00 cm \times 3.00 cm)\)

= 31.284 grams

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Explanation:

The correct formula for calcium fluoride is CaF2 (with two fluoride ions per calcium ion). Therefore, 2.25 moles of CaF2 contains:

- 2.25 moles of Ca2+ ions (since there is one calcium ion for every molecule of CaF2)

- 2 x 2.25 = 4.50 moles of F- ions (since there are two fluoride ions for every molecule of CaF2)

So, in total, 2.25 moles of CaF2 contains 2.25 moles of Ca2+ ions and 4.50 moles of F- ions.

Answer:

IAM at exam sorry that's why I can't answer

Answer: During diffusion, molecules flow down their concentration gradient.

Explanation:

They're flowing from an area of high concentration to an area of low concentration. Molecules flowing down a concentration gradient is a natural process and does not require energy.

The total mass of the balloon and its content is 1521.17 g, the number of moles of CO₂ in the balloon is 34.15 mol, and the number of CO₂ molecules in the balloon is 2.06 x 10²⁵ molecules.

a) The molar mass of CO₂ is 44.01 g/mol. To find the total mass of the balloon and its content, we need to add the mass of the balloon (20g) to the mass of the CO₂ inside the balloon.

Mass of CO₂ = number of moles of CO₂ x molar mass of CO₂

Since the balloon is at STP (standard temperature and pressure), we can use the molar volume of a gas at STP (22.4 L/mol) to find the number of moles of CO₂ in the balloon:

Volume of CO₂ = Volume of balloon = 765 L (at STP)

Number of moles of CO₂ = volume of CO₂ / molar volume of a gas at STP

                                          = 765 L / 22.4 L/mol

                                          = 34.15 mol

Mass of CO₂ = 34.15 mol x 44.01 g/mol

                       = 1501.17 g

Total mass of balloon and its content = 20 g + 1501.17 g

                                                               = 1521.17 g

b) Number of moles of CO₂ in the balloon is 34.15 mol

c) To find the number of CO₂ molecules in the balloon, we need to use Avogadro's number (6.02 x 10²³ molecules/mol).

Number of CO₂ molecules = number of moles of CO₂ x Avogadro's number

                                           = 34.15 mol x 6.02 x 10²³ molecules/mol

                                           = 2.06 x 10²⁵ molecules

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The limiting reactant is iron ore, the theoretical yield of iron metal is 701.344 kg, and the theoretical yield of carbon dioxide is 413.292 kg.

From the equation of the reaction:

\(2 Fe_2O_3(s) + 3 C(s) --- > 4 Fe(s) + 3 CO_2(g)\)

The mole ratio of iron ore to carbon is 2:3.

Mole of 1000 kg of iron ore = 1000000/159.69

                                          = 6,262 moles

Mole of 120 kg carbon = 120000/12

                                 = 10,000 moles

Thus, it appears that the carbon is in excess while the iron ore is limited in availability.

The mole ratio of the iron ore and the iron produced is 1:2. Thus, the equivalent number of moles of iron produced will be:

              6,262 x 2 = 12,524 moles

Mass of 12,524 moles of iron = 12,524 x 56

                                                = 701,344 g or 701.344 kg

Thus, the theoretical yield of iron is 701.344 kg.

The mole ratio of the iron ore and the carbon dioxide produced is 2:3. The equivalent mole of carbon dioxide produced will be:

         6,262 x 3/2 = 9,393 moles

Mass of 9,393 moles carbon dioxide = 9,393 x 44

                                                         = 413,292 or 413.292 kg

The theoretical yield of carbon dioxide is, therefore, 413.292 kg.

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Answer:

Lower the pH slightly

Explanation:

The mixture of HF, hydrofluoric acid and KF, potassium fluoride produce a buffer that is defined for the equilibrium:

HF(aq) → H⁺(aq) + F⁻(aq)

The buffer can maintain the pH of a solution despite the addition of strong bases or acids.

The reaction of HF with Ca(OH)2 is:

2HF + Ca(OH)2 → 2H2O + CaF2

That means the calcium hydroxide is decreasing the concentration of HF. Based on the equilibrium, the H+ and F- ions will decrease in order to produce more HF. As H+ is decreasing due the equilibrium and not for the addition of a strong base, the pH is decreasing slightly.

The given chemical equation, 2N₂ + 3H₂ <==>2NH3, is an example of a reversible reaction.option A.

The double arrows between the reactants and products indicate that the reaction can proceed in both directions, forming both products and reactants.The reversible reaction, also known as a chemical equilibrium reaction, refers to a chemical reaction that can occur in both forward and reverse directions. It occurs when reactants are converted into products, and the products are also converted back into the original reactants.A reversible reaction can be identified by the symbol “<==>” or “⇌” that appears between the reactants and products in the chemical equation. It denotes that the reaction is in a state of chemical equilibrium. When the reactants and products have achieved equilibrium, the rate of the forward and reverse reactions is equal, and there is no further net change in the amounts of the reactants and products.A combustion reaction is a type of exothermic reaction in which a substance reacts with an oxidizing agent to produce heat and light. A one-way reaction is a type of reaction that occurs in only one direction and cannot be reversed without significant changes to the reaction conditions, such as changing the temperature or pressure.A reversible reaction, unlike a one-way reaction, can occur in both directions and reach equilibrium when the forward and reverse reaction rates are equal.option A.

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Answer:

81.59%

Explanation:

First we convert 107.50 g of NH₃ into moles, using its molar mass:

Now we calculate how many moles of NO would have been formed by the complete reaction of 6.32 moles of NH₃:

Then we convert 6.32 moles of NO to grams, using its molar mass:

Finally we calculate the percent yield:

Answer:

T(final) = 26.2°C (3 sig. figs.)

Explanation:

Q = m·c·ΔT

m = mass of sample of interest = 20.0g

c = specific heat of sample of interest = 0.902j·g⁻¹·C⁻¹

ΔT = Temperature change = T(final) - T(initial) = T(f) - 2.5°C

Q = 427 joules

Q = m·c·ΔT => = ΔT = Q/m·c => T(f) = Q/m·c + T(i) = (427j/20.0g·0.902j·g⁻¹·C⁻¹) + 2.5°C = 26.16962306°C (calc. ans.) ≅ 26.2°C (3 sig. figs.)