which of the following enthalpy diagrams represent exothermic reactions? Endothermic reactions? please state which one each diagram is.​

[tex]\huge{\green}\fcolorbox{blue}{cyan}{\bf{\underline{\red{\color{red}Answer}}}} [/tex]

The change which increase the rate of the reaction is by increasing the amount of solution.

Rate of the reaction gives idea about the speed of the completion of the reaction or the formation of the products.

Given chemical reaction is:
2H₂O₂ [tex]\overset{MnO_{2}}{\rightarrow}[/tex] 2H₂O + O₂

In the above chemical reaction MnO₂ acts as a catalyst which helps in increasing the rate of the reaction without being involved in the reaction. So the formation of the product depends only on the concentration of the solution. So, by increasing the solution amount will increase in the rate.

Hence, increasing the amount of solution will increase the rate.

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Answer:

B. increasing the amount of solution

Explanation:

took the test:)

Answer:

Climate change and an increase in unpredictable and extreme weather is a growing challenge. Long periods of drought affect clean water supplies while flooding can pollute clean water sources and cause outbreaks of disease.

Answer:

could be areas they live in

Using the ideal gas law PV =nRTPV=nRT , we find that the pressure will be P =\frac{nRT}{V}P=

V

nRT

​

 . Then, we'll substitute and find the pressure, using T = -25 °C = 248.15 K and R = 0.0821 \frac{atm\cdot L}{mol \cdot K}

mol⋅K

atm⋅L

​

 :

P =\frac{nRT}{V} = \frac{(0.33\,\cancel{mol})(0.0821\frac{atm\cdot \cancel{L}}{\cancel{mol \cdot K}})(248.15\,\cancel{K})}{15.0\,\cancel{L}} = 0.4482\,atmP=

V

nRT

​

=

15.0

L

​

(0.33

mol

)(0.0821

mol⋅K

atm⋅

L

​

​

)(248.15

K

​

)

​

=0.4482atm

In conclusion, the pressure of this gas is P=0.4482 atm.

Reference:

Chang, R. (2010). Chemistry. McGraw-Hill, New York.

When for a solution concentration of hydroxide ions becomes equal to the concentration of hydronium ions, its pH becomes equal to 7.

pH of any solution is used to define the acidity, basicity or neutrality of the solution.

When the concentration of hydronium ion is equal to the concentration of the hydroxide ion then the resultant solution will be neutral, as they have a pH equals to 0.

Hence, pH of the solution becomes equal to 7.

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The value of [tex]K_{a}[/tex] for HF is, 3.5 x [tex]10^{-4} M[/tex]

The aqueous solution definition means simply that something has been dissolved in water. The aqueous symbol is (aq). Aqueous solution definition: something is dissolved in water.

Solution : Given,

pH = 2.03

Concentration of HF = 0.25 M

First, we have to calculate the concentration of [tex]H^{+}[/tex] ion.

pH=-log [[tex]H^{+}[/tex]]

2.03=-log [[tex]H^{+}[/tex]]

[tex]H^{+}[/tex]= 9.3 x [tex]10^{-3} M[/tex]

Now we have to calculate the value of  [tex]K_{a}[/tex] for HF.

The equilibrium reaction will be:

[tex]HF\leftrightharpoons \ H^{+}+F^{-}[/tex]

Concentration of  [tex]H^{+}[/tex] = Concentration of  [tex]F^{-}[/tex]= 9.3 x [tex]10^{-3} M[/tex]

The expression of [tex]K_{a}[/tex] for HF will be,

[tex]k_{a} =\frac{[F]^{-} [H]^{+} }{HF}[/tex]

[tex]K_{a}[/tex] = 3.5 x [tex]10^{-4} M[/tex]

Therefore, the value of [tex]K_{a}[/tex] for HF is, 3.5 x [tex]10^{-4} M[/tex]

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The correct order of the vertical cross-section of soil layers is organic, topsoil, subsoil, parent rock, and bedrock.

The soil profile is the vertical cross-section of soil from the top to the underlining bedrock layer.

Starting from the top, soil contains organic materials in the form of decomposing leaves, twigs, etc. Immediately after the organic materials lies the topsoil.

After the topsoil comes the subsoil, parent rock, and bedrocks respectively.

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Answer:

A organic, topsoil, subsoil, parent rock, bedrock

Explanation:

Taking into account the definition of dilution, a volume of KI solution of 0.125 L of concentration of 3 M would use to make 0.3L of KI solution of 1.25 M.

When it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution.

Dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.

In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.

A dilution is mathematically expressed as:

Ci×Vi = Cf×Vf

where

In this case, you know:

Replacing in the definition of dilution:

3 M× Vi= 1.25 M× 0.3 L

Solving:

Vi= (1.25 M× 0.3 L)÷ 3 M

Vi= 0.125 L

In summary, a volume of KI solution of 0.125 L of concentration of 3 M would use to make 0.3L of KI solution of 1.25 M.

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Answer:

D

Explanation:

1/2 will be lit with 'daylight' and the other half will be dark

One of the following substances would be the most soluble in CCl₄ is C₄H₁₀.

CCl₄ is carbon tetra chloride is an organic compound with a sweet smell and colorless liquid.

It is used in liquid for refrigerator, as a pesticide, a propellant for aresol cans and in fire extinguisher, but it is very a harmful substance that why it is banned.

Thus, the substances would be the most soluble in CCl₄ is C₄H₁₀.

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Answer: Volume of H2 gas is 30.576 Litres

Explanation:

The reaction between HCl and Zn is as follows:

Moles of HCl = 100/36.5 = 2.73 moles

Moles of Zn = 100/65 = 1.53 moles

As per Reaction and available reagents , HCl is the limiting reagent.

So, we can say that :

2 moles HCl gives 22.4 L of H2 gas.

=> 2.73 moles of HCl gives

So, final answer is:

Volume of H2 gas is 30.576 Litres.

Answer:

the 3 in the middle

Explanation:

There are 5 signs of chemical changes these are odor change,color change, temperature change, production of gas and creation of precipitation.

The pH of a solution that has a H⁺ ion concentration is 0.0039M is 2.4.

pH of any solution gives idea about the acidity or basicity of solution and it will be calculated as:

pH = -log[H⁺]

Given that, concentration of H⁺ ion = 0.0039 M

On putting tis value in pH equation, we get

pH = -log(0.0039)

pH = -(-2.4) = 2.4

Hence required value of pH is 2.4.

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Answer: 56.5 J

Explanation:

The illustration would be that of a double replacement reaction.

They are reactions in which 2 ionic compounds exchange ions to form two new products.

Thus, in the reaction: ab + cd ----------> ad + cb

ab and cd are two ionic compounds. The b in ab is replaced by the d in cd while the d in cd itself is replaced by the b in ab. Hence, new products, ad and cd, are formed.

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The quantity of carbon tetrachloride, CCl₄ she will use to make her conversion is molar mass

The mole of a substance is related to it's mass and molar mass according to the following equation:

Mole = mass / molar mass

Mole = mass / molar mass

Mole of CCl₄ = 150 / 154

Mole of CCl₄ = 0.974 mole

Thus, we can see that the molar mass of CCl₄ is needed to obtain the number of mole.

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The cell reaction for the voltaic cell is 2Cr(s) + 3Cl₂(g) → 2Cr₃ + (aq) + 6Cl⁻ (aq). The correct option is d.

A voltaic cell is an electrochemical cell that generates electricity through a chemical reaction.

A voltaic cell's most important components are: The anode is an electrode that undergoes oxidation. The cathode is an electrode that undergoes reduction.

Thus, the correct option is d, 2Cr(s) + 3Cl₂(g) → 2Cr₃ + (aq) + 6Cl⁻ (aq).

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The compound nitrogen have most positive oxidation state is NO₂. The correct option is b.

The total number of electrons gained or lost by an atom in order to form a chemical bond with another atom.

The charge on an ion is equal to the sum of the oxidation states of all the atoms in the ion. A substance's more electronegative elements are given a negative oxidation state.

A positive oxidation state is assigned to the less electronegative element.

Thus, the correct option is b, NO₂.

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Answer:

There are 7 diatomic elements: hydrogen, nitrogen, oxygen, flourine, chlorine, iodine and bromine

The pair in which former is stronger nucleophile than later in polar aprotic solvent is CH₃NH₂ and (CH₃)₂NH. The correct option is A.

Nucleophiles are molecules that have a pair of electrons that can be shared. They are also called electron rich species.

Polar aprotic solvents are incapable of forming hydrogen bonds with the substrate. They don't have any hydrogen atoms directly connected to an electronegative atom, so they can't form a hydrogen bond.

Acetone, chloroform, dichloromethane, and other aprotic solvents are examples.

Thus, the correct option is  A. CH₃NH₂ and (CH₃)₂NH.

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Answer:

When chlorine (Cl 2 ) gas is passed through an aqueous solution of potassium iodide (KI), the products formed are solid iodine (I2) and potassium chloride (KCl). This is a displacement reaction in which the less reactive iodine in potassium iodide is displaced by the more reactive chlorine. The equation can be written as:

2KI(aq)+Cl2(g)→2KCl(aq)+I2 (s)

The relative ratio, uav : ump : urms of a gas at a given temperature is 56 / 22 : 2 : 3.

Temperature is the measurement of hotness or coldness of a body. It shows the direction of flow of heat.

The relative rate (RR), also known as a rate ratio, is the ratio of the disease or death incidence rate in the exposed group to the disease or death incidence rate in the unexposed group.

Thus, the relative ratio, uav : ump : urms of a gas at a given temperature is 56 / 22 : 2 : 3.

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Answer:

It's 1, places that are closer to the equator receive more direct sunlight and have

Explanation:

Answer:

Long answer

Proteins are the building blocks of the body, each and every organ muscle and skin and cells are made of proteins. They can also be used for providing energy to the body in a state where other energy sources aren't available.

Fats are stored energy blocks which can be used by the body at its own convenience whenever there is a deficit of energy in the body. They can also be directly burnt to give energy in cases where energy needs of the body are not met by dietary intake

Carbohydrates are the most convenient and preferable source of energy in the body and are easily converted to give out immidiate energy to the body, excess carbohydrates can be converted into fats and stored for later usage as and when required by the body.

Proteins, fats and carbohydrates have many secondary functions and roles in the human body. If you are keen to know anything more specific feel free to ask.

Fats are used for energy after they are broken into fatty acids. Protein can also be used for energy, but the first job is to help with making hormones, muscle, and other proteins.

Answer:

Most Nutrients are digested into easy and simpler compounds. Carbohydrates are used for energy . Fats are used for energy after they are broken into fatty acids. Protein can also be used for energy, but the first job is to help with making hormones, muscle, and other proteins.

Sorry this is late but the molecules in the substance will move much slower and take up less place as a molecule that moves faster will take up more space

Hope this helps :))