Question 4.1Write the equilibrium constant expression,Kc , for the following reaction:

(If either the numerator or denominator is 1, please enter 1.)

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Answer:

Explanation:

In order to balance the equation, the coefficients in front of each element must be equal on both sides of the equation. Here's one way to balance the equation:

2 AI + 3 CuSO4 ---------------> 2 AI2(SO4)3 + 3 Cu

This means that for every 2 atoms of AI and 3 molecules of CuSO4, you'll get 2 molecules of AI2(SO4)3 and 3 atoms of Cu.

Explanation:

The heart of the doorbell is an electromagnetic so yeah it does.

A water solution at a certain temperature has a concentration of OH of 7.5 x 10-7 M.

The Kw at this temp , the neutral solution has the concentration of hydroxide ions equal to that of hydrogen ions. It's pH is always 7.

A neutral solution has no acid or base.

Hence,

Kw = 2081 × 10^13

concentration  of   = 7.5 ×   M

For neutral solution   = (H3O+) = 7.5 ×   M

From relation from Kw,  , and H3O+

Kw = [ ][H3O+] =  7.5 ×   M × 7.5 ×   M

Kw = 5.62  ×  10_13

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\(K_{w}\) for water at this temperature is 5.6×\(10^{-13}\)

The equilibrium constant \(K_{w}\) is called the dissociation constant or the ionization constant of water. This is the tool used to determine the hydronium ion concentration and the hydroxide ion concentration

It can also be used to determine the range of  pH scale.

The Kw expression is the equilibrium constant for water. It can be calculated by multiplying the concentration of hydronium ions by the concentration of hydroxide ions.

\(K_{w}\) = \([H]^{+}\)× \([OH]^{-}\)

Since the given solution is a neutral solution;

\([H]^{+}\) = \([OH]^{-}\) = 7.5×\(10^{-7}\)

Therefore \(K_{w}\) = (7.5×\(10^{-7})^{2}\) = 56.25×\(10^{-14}\)

Hence \(K_{w}\) for water will be = 5.62×\(10^{-13}\)

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Freezing leads to weathering because water expands when it freezes and cracks rocks open Water expands when it freezes and cracks rocks open

The term weathering has to do with the process of the breakdown of the rocks to give rise to the soil. Now there are are various ways in which the process of weathering could be able to take place. One of the ways that the process of weathering can take place is what we call physical weathering.

In the process of physical weathering, we are looking at some kind of physical pressure which would lead to the breakdown of the rock. This is what makes it different from the chemical and the mechanical forms of weathering.

Thus, the fact that water would expand when we freeze it would mount pressure on the rock and then cause it to weather and form soil.

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Answer:

i. La (s) + O2 (g) => LaO2 (s)

ii. La (s) + O2 (g) => La2O (s)

III. La (s) + O2 (g) => La2O3 (s)

Explanation:

Hello there!

When you are given such a problem for completing the chemical equations, what you have to understand is that metals are found in groups I, II and III. While Oxygen is a group VI element.

From the above question I have considered that my La(s), solid is either Sodium (Na) - group I, Magnesium - group II and Aluminum - group III.

In a reaction, there is exchange of electrons given by their oxidation numbers (I, II and III - for our metals above)

The chemical equations are thus;

i. Na (s) + O2 (g) => NaO (s)

ii. Mg (s) + O2 (g) => Mg2O (s)

iii. Al (s) + O2 (g) => Al2O3 (s)

Relate this to the problem and it will be;

i. La (s) + O2 (g) => LaO2 (s)

ii. La (s) + O2 (g) => La2O (s)

III. La (s) + O2 (g) => La2O3 (s)

I hope this helps you to understand better. Enjoy your studies

Answer:

Pentyl Ethanoate, CH3COOC5H11, which smells like bananas, is produced from the esterification reaction: CH3COOH(aq) +C5H11OH(aq) → CH3COOC5H11(aq) + H … 2O(l) A reaction uses 3.58g of CH3COOH and 4.75g of C5H11OH and has a yield of 45.00%. Determine the mass of ester that foorms

Answer:

1)If I mixed salt in water I would expect the salt to: dissolve.

2) If I mixed starch in water I would expect the starch to: remain undissolved.

Explanation:

Hello,

In this case, since salt, which is commonly known as sodium chloride (NaCl) is an ionic compound, it is very likely to get dissolved in water, therefore, we would expect the salt to dissolve and form a liquid solution.

Moreover, since start is mainly composed by C-C, C-O and C-H bonds which are nonpolar, it we can say it is usually insoluble in water, therefore we will expect starch to remain undissolved but undergoing a process called gelatinization in which a suspension in formed until a slightly solid consistency.

Best regards.

The two carbon atoms:

Isotopes are atoms of the same element with the same number of protons but different numbers of neutrons. The difference in the number of neutrons leads to different atomic masses for each isotope.

Therefore, since 14C and 13C are two different carbon atoms with different numbers of neutrons, they are two different carbon isotopes with different atomic weights, but they have the same number of protons (i.e., they are both carbons).

They do not have a different number of electrons, as the number of electrons is determined by the number of protons (which is the same in both atoms) in a neutral atom.

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The enthalpy change of combustion of methane : -892 kJ/mol

The change in enthalpy in the formation of 1 mole of the elements is called enthalpy of formation  

The enthalpy of formation measured in standard conditions (25 ° C, 1 atm) is called the standard enthalpy of formation (ΔHf °)  

Determination of the enthalpy of formation of a reaction can be through a calorimetric experiment, based on the principle of Hess's Law, enthalpy of formation table, or from bond energy data  

The value of ° H ° can be calculated from the change in enthalpy of standard formation:  

∆H ° rxn = ∑n ∆Hf ° (product) - ∑n ∆Hf ° (reactants)  

Reaction for combustion of Methane (CH₄) :

CH₄ + 2O₂ → CO₂ + 2H₂O.

The elements in standard conditions are not included in the enthalpy calculations because the enthalpy of those elements under the standard conditions is zero(∆Hf °O₂ =0)

∆Hf ° CO₂ = -394 kj/mol

∆Hf ° H₂O=-286 kj/mol

∆Hf ° CH₄=-74 kJ/mol

The enthalpy change of combustion of methane :

\(\tt \Delta H_{rxn}=\Delta H_f~CO_2+2.\Delta H_fH_2O-(\Delta H_fCH_4)\\\\\Delta H_{rxn}=(-394-2.-286)-(-74)\\\\\Delta H_{rxn}=-892~kJ/mol\)

Answer:

-655

Explanation:

ye

Answer:

The concentration is 2.277

Explanation:

The formula for finding the concentration of a solution is C= mole of solute divided by the volume of the solution

Therefore, C= 2.05/0.900

C=2.277

A) Ethanol in water: Distillation.

B) Boiling the mixture of chloride crystals with water: Evaporation.

C) Pure water from muddy water: Filtration.

D) Sodium chloride in water: Evaporation or Crystallization.

E) Sodium carbonate in water: Filtration or Evaporation.

F) Chlorophyll from leaves: Extraction using a suitable solvent like ethanol.

G) Mixture of acetic acid and alcohol: Distillation.

H) Serum from blood sample: Centrifugation.

I) Kerosene from water: Separatory funnel or Decantation.

J) Ammonium chloride in sand: Sublimation or Dissolving in water and Filtration.

A) Ethanol in water: Distillation can be used to separate ethanol from water based on their different boiling points.

B) Boiling the mixture of chloride crystals with water: By heating the mixture, the water will evaporate, leaving behind the chloride crystals.

C) Pure water from muddy water: Filtration can be used to separate the solid particles (mud) from the water.

D) Sodium chloride in water: Evaporation can be used to separate sodium chloride from water by heating the mixture until the water evaporates, leaving behind the salt.

E) Sodium carbonate in water: Filtration can be used to separate solid sodium carbonate from water, similar to muddy water.

F) Chlorophyll from leaves: Extraction using a suitable solvent like ethanol or acetone can be used to separate chlorophyll from leaves.

G) Mixture of acetic acid and alcohol: Distillation can be used to separate the mixture based on their different boiling points.

H) Serum from blood sample: Centrifugation can be used to separate the serum, which is the liquid part of blood, from the solid components like cells.

I) Kerosene from water: Separatory funnel or decantation can be used to separate the immiscible liquids by pouring off the top layer (kerosene) from the bottom layer (water).

J) Ammonium chloride in sand: Sublimation can be used to separate ammonium chloride by heating the mixture, causing the ammonium chloride to vaporize and then condense back into solid form in a cooler region, leaving the sand behind.

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Answer:  3 bromite ions will bind with \(Sc^{3+}\) and the chemical formula will be \(Sc(BrO_2)_3\).

Explanation:

For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.  

Here scandium is having an oxidation state of +3 called as \(Sc^{3+}\) cation and bromite is an anion with oxidation state of -1 called as \(BrO_2^-\). Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral \(Sc(BrO_2)_3\).

Thus 3 bromite ions will bind with \(Sc^{3+}\) and the chemical formula will be \(Sc(BrO_2)_3\).

Answer:

3 bromite ions, Sc(BrO2)3

Explanation:

Answer:

the mass of one spoonful of sugar to nearest gram is 10g

This question is asking for the complete, ionic and net ionic chemical equations for the reaction between liquid bromine with a solution of hydrochloric acid and cobalt (II) iodate mixed with a solution of iron (III) oxalate.

In this case, according to the given information, it turns out possible to figure out the required, by considering that the complete chemical equation has the correct balance and states of all species involved, the ionic one shows the ionizable species and the net ionic do not show any spectator ion. In such a way, we proceed as follows:

a.

\(Br_2(l)+2HCl(aq)\rightarrow Cl_2(g)+2HBr(aq)\): Complete.

We can ionize HCl and HBr as they are aqueous:

\(Br_2(l)+2H^+(aq)+2Cl^-(aq)\rightarrow Cl_2(g)+2H^+(aq)+2Br^-(aq)\): Ionic

Finally, we cancel out the hydrogen ions as the spectator ones:\(Br_2(l)+2Cl^-(aq)\rightarrow Cl_2(g)+2Br^-(aq)\)

b.

\(3Co(IO_3)_2(s)+Fe_2(C_2O_4)_3(aq)\rightarrow 3CoC_2O_4(s)+2Fe(IO_3)_3(aq)\): Complete

We ionize the iron-containing species:

\(3Co(IO_3)_2(s)+2Fe^{3+}(aq)+3(C_2O_4)^{2-}(aq)\rightarrow 3CoC_2O_4(s)++2Fe^{3+}(aq)+6(IO_3)^-(aq)\)

Finally, we cancel out the iron ions as the spectator ones:

\(3Co(IO_3)_2(s)+3(C_2O_4)^{2-}(aq)\rightarrow 3CoC_2O_4(s)+(aq)+6(IO_3)^-(aq)\)

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Answer:

D.sandals

Explanation:

I think we need to wear shoes......so to protect or cover our feet

Answer:

To convert joules to calories, you can use the conversion factor:

1 calorie = 4.184 joules

To find out how many calories are in 4,180 joules, divide the given value by the conversion factor:

4,180 joules / 4.184 joules per calorie = 0.9 calories (approximately)

Therefore, there are approximately 0.9 calories in 4,180 joules.

The hydrogen ion molarity : 6.918 x 10⁻¹¹ M

pH is the degree of acidity of a solution that depends on the concentration of H⁺ ions. The greater the value the more acidic the solution and the smaller the pH.  

pH = - log [H⁺]  

So that the two quantities between pH and [H⁺] are inversely proportional because they are associated with negative values.  

A solution whose value is different by n has a difference in the concentration of H⁺ ion of 10ⁿ.  

pH of solution = 10.16

the [H₃0⁺] of the solution :

\(\tt pH=-log[H_3O^+]\\\\10.16=-log[H_3O^+]\\\\(H_3O^+]=10^{-10.16}=6.918\times 10^{-11}\)

Answer: c. endothermic reaction.

Explanation: In an endothermic reaction, energy is absorbed or required to break the bonds in the reactants. This means that more energy is required to break the bonds than is released by the formation of new bonds in the products, resulting in a net absorption of energy. In this case, the amount of energy required to break the bonds (1254 kJ) is higher than the energy produced by breaking the bonds (1001 kJ), indicating that the reaction requires an input of energy and is therefore endothermic.

Answer:

c. endothermic reaction

Explanation:

The given information states that the amount of energy required to break the bonds of the covalent compound is 1254 kJ, and the energy produced as a result of breaking the bonds is 1001 kJ.

In an endothermic reaction, the energy required to break the bonds is greater than the energy released or produced. This means that more energy is absorbed from the surroundings than is released during the reaction. In this case, since the energy required to break the bonds (1254 kJ) is greater than the energy produced (1001 kJ), it indicates that the reaction requires an input of energy from the surroundings, making it an endothermic reaction.

Option c, "endothermic reaction," is the correct answer based on the given information.

The final volume of the system, given that half of the gas is removed, leaving 0.50 mole in the cylinder and the system is warmed to 900 K is 18.45 liters

From ideal gas equation, we have

PV = nRT

Rearrange

V / nT = R/ P

R / P = Constant

Thus, we have

V₁ / n₁T₁ = V₂ / n₂T₂

Where

With the above formula, we can obtain the final volume of the system as follow:

V₁ / n₁T₁ = V₂ / n₂T₂

12.3 / (1 × 300) = V₂ / (0.5 × 900)

Cross multiply

1 × 300 × V₂ = 12.3 × 0.5 × 900

300 × V₂ = 5535

Divide both side by 300

V₂ = 5535 / 300

V₂ = 18.45 liters

Thus, the final volume of the system is 18.45 liters

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Answer:

A

Explanation:

195.49 g K x 1 mole / 39.01 g x 6.022 x 10^23 atoms/mole = 30.11 x 10^23 = 3.011 x 10^24

The number of K atoms present in 195.49 grams of K is 3.0110 × 10²⁴ atoms. The correct option is a 3.0110 x 10²⁴.

From the question,

We are to determine the number of K atoms present in 195.49 grams of K.

First, we will determine the number of moles K present

Using the formula,

\(Number\ of\ moles = \frac{Mass}{Atomic\ mass}\)

Atomic mass of K = 39.0983 g/mol

Number of moles of K present = \(\frac{195.49}{39.0983}\)

Number of moles of K present = 4.99996 moles

Number of moles of K present ≅ 5 moles

Now, for the number of atoms present

From the formula

Number of atoms = Number of atoms × Avogadro's constant

Number of K atoms present = 5 × 6.022 × 10²³

Number of K atoms present = 5 × 6.022 × 10²³

Number of K atoms present = 30.11 × 10²³

Number of K atoms present = 3.0110 × 10²⁴ atoms

Hence, the number of K atoms present in 195.49 grams of K is 3.0110 × 10²⁴ atoms. The correct option is a 3.0110 x 10²⁴.

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Let's begin

\(\\ \rm\Rrightarrow m_1c\Delta T_1=m_2c\Delta T\)

\(\\ \rm\Rrightarrow 0.074(94)c=\dfrac{(74+120)(1)(5.5)}{1000}\)

\(\\ \rm\Rrightarrow 6.956c=\dfrac{(194)(5.5)}{1000}\)

\(\\ \rm\Rrightarrow 6.956c=1.067\)

\(\\ \rm\Rrightarrow c=0.00015kcal/kg°C\)

\(\\ \rm\Rrightarrow c=0.015cal/g°C\)

For an electron as a particle, E = \(1/2mv^2\)

For an electron as a particle, the energy E can be described using the equation:

E =  \(1/2mv^2\)

where

This equation represents the kinetic energy of the electron, which is the E is the energy

energy associated with its motion.

This equation assumes classical mechanics and does not take into account relativistic effects that become significant at high speeds close to the speed of light.

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Explanation:

n2 ×2b is the only solution

Answer:

I think it is...

The lightning helps produce oxidized forms of nitrogen, such as nitrate.

In an ecosystem, the lightning helps produce oxidized forms of nitrogen such as nitrate which nourishes the soil.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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Answer:

a and b

Explanation:

Opals are formed when water in oceans dribble through the Earth, picking up silica from sandstone along the way. And really, that only happens when the ocean water touches the land.

The balanced equation of the reaction could be written as; \(HN_{5} O_{3} + Mg ------ > MgO + HNO_{3}\)

We know that in chemistry, the term reaction has to do with the combination of two or more species to give a product. Now the process of the reaction would alter the chemical composition of the reactants as we move on the way to get the ne substances called the products. There would be a breaking down of the bonds that holds the reactant molecules together and then there is a recombination of the atoms in a different way so as to obtain the products of the reaction. This is how a chemical reaction takes place in a given system.

In this case we have the oxidation of the compound called \(HN_{5} O_{3}\). In this case, the compound is actually being oxidized as we can see from the process that would be shown in the reaction equation accurately.

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we would need 2625.13 grams (or 2.62513 kilograms) of NaCl.

To calculate the mass of NaCl required to produce a 26.4 mol/L solution with a 1.7 L volume, we need to use the formula that relates the mass of solute, moles of solute, and molarity:Molarity (M) = moles of solute / liters of solution Rearranging this formula, we get:moles of solute = Molarity (M) x liters of solutionWe can use this formula to find the moles of NaCl needed:moles of NaCl = 26.4 mol/L x 1.7 L = 44.88 molNow, we can use the molar mass of NaCl to convert from moles to grams. The molar mass of NaCl is 58.44 g/mol:mass of NaCl = moles of NaCl x molar mass of NaClmass of NaCl = 44.88 mol x 58.44 g/mol = 2625.13 gTo produce a 26.4 mol/L solution with a 1.7 L volume.

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