At what temperatures is a reaction that has a positive change in entropy
spontaneous?
A. At all temperatures for exothermic reactions
B. At lower temperatures for endothermic reactions
C. At all temperatures for endothermic reactions
D. At no temperatures for exothermic reactions

A substance will react with oxygen to form water and carbon. ... dioxide.

Answer:

it will rain and there the other defined for precipitation snow and sleet and hail

The question is incomplete, the complete question is:

Write the net ionic equation for the below chemical reaction:

(c): [tex]FeCl_3+3NH_4OH\rightarrow Fe(OH)_3+3NH_4CI[/tex]

Answer: The net ionic equation is [tex]Fe^{3+}(aq)+3OH^{-}(aq)\rightarrow Fe(OH)_3(s)[/tex]

Explanation:

Net ionic equation is defined as the equations in which spectator ions are not included.

Spectator ions are the ones that are present equally on the reactant and product sides. They do not participate in the reaction.

(c):

The balanced molecular equation is:

[tex]FeCl_3(aq)+3NH_4OH(aq)\rightarrow Fe(OH)_3(s)+3NH_4Cl(aq)[/tex]

The complete ionic equation follows:

[tex]Fe^{3+}(aq)+3Cl^-(aq)+3NH_4^+(aq)+3OH^{-}(aq)\rightarrow Fe(OH)_3(s)+3NH_4^+(aq)+3Cl^-(aq)[/tex]

As ammonium and chloride ions are present on both sides of the reaction. Thus, they are considered spectator ions.

The net ionic equation follows:

[tex]Fe^{3+}(aq)+3OH^{-}(aq)\rightarrow Fe(OH)_3(s)[/tex]

Copper has a density of 8950 kg/m3 = 8.95 kg/dm3 = 8.95 g/cm3. Water has a density of 1000 kg/m3 = 1000 g/L = 1 kg/dm3 = 1 kg/L = 1 g/cm3 = 1 g/mL.

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Answer:

[tex]V_l=67mL[/tex]

Explanation:

From the question we are told that:

Initial Volume [tex]V_1=375mL[/tex]

Final Volume [tex]V_2=308mL[/tex]

Generally the equation for Left-Over is mathematically given by

 [tex]V_l=V_1-V_2[/tex]

 [tex]V_l=375-308[/tex]

 [tex]V_l=67mL[/tex]

Answer:

2 g of H₂

Explanation:

We have:

7 g of N₂

16 g of NO₂

16 g of O₂

2 g of H₂

Let's count to verify the moles:

7 g . 1 mol / 28g = 0.25 moles of nitrogen

16 g . 1 mol / 46g = 0.348 moles of nitrogen dioxide

16 g . 1mol /32g = 0.5 moles

2 g . 1 mol / 2g = 1 mol

The biggest number of moles is in the hydrogen.

1 mol of anything contains NA particles

1 mol of oxygen contains 6.02×10²³ molecules, the maximun number

Answer:

Before the equivalence point, conductivity is decreasing. After the equivalence point, conductivity is increasing

Explanation:

In solution H2SO3 produce H+ ions and SO3²⁻ ions. In the same way, NaOH produce Na⁺ and OH⁻ ions. The conductivity of a solution is directly proportional to the concentration of ions in a solution. During titration, you are adding more NaOH (That is, more Na⁺ and OH⁻ ions). But each moles of OH⁻ reacts with H⁺ ion producing H₂O. That means the moles of Na⁺ that you are adding = Moles of H⁺ are been consumed. The concentration of ions remains approximately constant. But, H⁺ ion conducts better than Na⁺ ion. That means before the equivalence point, conductivity is decreasing. But after the equivalence point you will add OH- ions in excess increasing ion concentration increasing the conductivity:

After equivalence point, conductivity is increasing.

Answer:

2.4 × 10⁻⁴ M

Explanation:

Step 1: Calculate the concentration of Mg²⁺ coming from Mg(NO₃)₂

Mg(NO₃)₂ is a strong electrolyte and the molar ratio of Mg(NO₃)₂ to Mg²⁺ is 1:1. The initial molar concentration of Mg²⁺ is 1/1 × 0.36 M = 0.36 M.

Step 2: Make an ICE chart for the solution of MgF₂

        MgF₂(s) ⇄ Mg²⁺(aq) + 2 F⁻(aq)

I                           0.36             0

C                           +S             +2S

E                         0.36+S         2S

The solubility product constant is:

Ksp = [Mg²⁺] × [F⁻]² = (0.36+S) × (2S)²

Since S <<< 0.36, 0.36+S ≈ 0.36.

Ksp = 0.36 × 4S² = 8.4 × 10⁻⁸

S = 2.4 × 10⁻⁴ M

Explanation:

Science is the pursuit and application of knowledge and understanding of the natural and social world following a systematic methodology based on evidence

Answer: Sodium element has 1 valence electron and chlorine element has 7 valence electrons.

Explanation:

Valence electrons are defined as the electrons that are present in the outermost shell.

An ionic compound is formed when the complete transfer of electrons takes place from one element (usually metals) to another element (usually non-metals).

To know this, we need to write the electronic configuration of each element.

Sodium is the 11th element of the periodic table and has an electronic configuration of [tex]1s^22s^22p^63s^1[/tex]

It has 1 valence electron

Chlorine is the 17th element of the periodic table and has an electronic configuration of [tex]1s^22s^22p^63s^23p^5[/tex]

It has 7 valence electrons

Hence, sodium element has 1 valence electron and chlorine element has 7 valence electrons.

Answer:

Strontium - 38 (atomic #)

Explanation:

An ion with 38 protons, 36 electrons, and 40 electrons is Strontium. Strontium's atomic number is 38.

Answer:

For each system listed in first column of the table below, decide (if possible) whether the change described in the second column will increase the entropy S of the system, decrease S , or leave S unchanged. If you don?t have enough information to decide, check the not enough information button in the last column

Answer: Hello the reaction related to your question is missing attached below is the reaction

answer : attached below

Explanation:

The structure of the neutral organic product formed in the reaction is attached below.

The neutral organic product formed is ESTER

The reaction in the question is Anhydride on reaction with alcohol

Answer:

Explanation:

Hope this helps

Answer:

See explanation

Explanation:

Racemization is said to occur when a 1:1 ratio of (+) and (-) enantiomers of a compound are produced in a reaction.

The reaction of optically active (R)-2-methylcyclohexanone with either aqueous base or acid leads to the formation of a planar enol species for reaction with acid and a planar enolate species for reaction with base.

Both reactions involves the formation of achiral species which reverts back to the chiral product with equal chances of the formation of both enantiomers of the product during the process. This leads to racemization of the product in both cases.

Racemization of the optically active (R)-2-methylcyclohexanone results from the production and subsequent interconversion of intermediates during the reaction with an aqueous base or acid. This is due to the inversion of stereochemistry at the chiral centre.

Racemization can happen when an optically active molecule is exposed to an aqueous base or acid because the compound's enantiomers are interconverted. The carbon-carbon bond next to the carbonyl group in (R)-2-methylcyclohexanone breaks as a result of the chemical reaction with the aqueous base or acid. The creation of the negatively charged intermediate known as the enolate ion occurs when a base, such as hydroxide ions, is present and attacking the carbonyl carbon. The carbonyl group can then be reformated by this enolate ion after it has undergone a nucleophilic attack on a proton.

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Answer: The chemical equation is [tex]HCl(g)+NH_3(g)\rightarrow NH_4Cl(s)+42.1kCal[/tex]

Explanation:

There are 2 types of reactions that are classified based on enthalpy change:

Endothermic reactions: They are defined as the reactions where heat is absorbed by the reaction. The change in enthalpy of the reaction is always positive.

Exothermic reactions: They are defined as the reactions where heat is released by the reaction. The change in enthalpy of the reaction is always negative.

Given values:

Energy released for 1 mole of HCl reacted = -42.1 kCal

The chemical equation for the formation of ammonium chloride follows:

[tex]HCl(g)+NH_3(g)\rightarrow NH_4Cl(s)+42.1kCal[/tex]

Answer: el texto no es tan claro

Answer:

1. B

2.B

3.B

4.C

5.C

Explanation:

I hope this help you

Answer:

matter i think

Explanation:

matter i am pretty sure

The law that allows calories to be determined by heat (energy) transfer from one substance to another, but it is never destroyed is first law of thermodynamics.

Energy cannot be generated or destroyed, only changed in form, according to the basic law of thermodynamics.

Hence first law of thermodynamics justify the given statement.

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Answer:

condensation

Explanation:

the water has condensed from the gaseous form into rain drops

Answer:

precipitation

Explanation:

Answer:

ethyl ethanoate and water

Explanation:

At the point when one fluid doesn't blend in with another yet glides on top of it, an isolating pipe can be utilized to isolate the two fluids. Oil glides on water. This combination can be isolated utilizing an isolating channel as demonstrated on the following page.  

Ethyl liquor and water are two miscible fluids.   Refining is a cycle that can be utilized to isolate an unadulterated fluid from a combination of fluids. An isolating channel can be utilized to isolate the parts of the combination of immiscible fluids.

The answer is ethyl ethanoate and water. Hope this helps you!

Answer:

I assume your talking about carbon when you say 12 so it'd be 12 grams if you are

Explanation:

The molar mass of any substance in grams per mole is numerically equal to the mass of that substance expressed in atomic mass units.

Hope this helps you some

Answer:

A

Explanation:

In plant and yeast cells pyruvate is converted into carbon dioxide and a type of alcohol called ethanol . This process is called fermentation and yields only two molecules of ATP per glucose molecule broken down.

[tex]CO_2 + H_20[/tex]+ light energy → [tex]O_2[/tex] + sugar chemical equation represents a process that takes place in yeast cells. Hence, option A is correct.

A representation of a chemical reaction using symbols of the elements to indicate the amount of substance, usually in moles, of each reactant and product.

In plant and yeast cells pyruvate is converted into carbon dioxide and a type of alcohol called ethanol. This process is called fermentation and yields only two molecules of ATP per glucose molecule broken down.

Hence, option A is correct.

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Answer:

Final pressure = 6 atm

Final volume = 1.1 L

Final temperature = 100 K

Explanation:

We are given;

Initial Pressure; P1 = 2 atm

Initial volume; V1 = 3.3 L

Initial temperature; T1 = 27° C + 273 = 300 K

Final pressure; P2 = 6 atm

We will use Boyles law to get the final volume.

P1V1 = P2V2

V2 = (P1 × V1)/P2

P2 = (2 × 3.3)/6

V2 = 1.1 L

We can use Charles law to find the final temperature.

V1/T1 = V2/T2

T2 = (V2 × T1)/V1

T2 = (1.1 × 300)/3.3

T2 = 100 K

Answer:

Use the observations about each chemical reaction in the table below to decide the sign (positive or negative) of the reaction enthalpy AH and reaction entropy AS. Note: if you have not been given enough information to decide a sign, select the "unknown" option observations conclusions reaction ΔΗ is (pick one) The reverse of this reaction is always spontaneous. A As is (pick one) This reaction is spontaneous except below ΔΗ is (pick one) 38. °C but proceeds at a faster rate above (pick one) 91. °C As is ΔΗ iS (pick one) Crystallization of a pure compound is C spontaneous only below 146. °C. AS is (pick one) X

the x y axis is tipped so the earth is flat

Answer:

solo I

Explanation:

Según esta teoría para que se produzca una reacción deben cumplirse tres condiciones: Las moléculas de los reactivos tienen que chocar entre sí. Estos choques deben de producirse con energía suficiente de forma que se puedan romper y formar enlaces químicos.

Answer:

all of the above

Explanation:

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