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3 years ago

In a solution, litmus is blue. The pH of the solution could be 1. 10 2. 2 3. 3 4. 4

Chemistry

1 answer:

yan [13]3 years ago

7 0

Answer:

1. 10

Explanation

when litmus paper is blue that means the solution is basic and 10 on the pH scale is the most basic out of all your options

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Which of the following is an example of kinetic energy?

Vadim26 [7]

I think the correct answer is B I am so sorry if it’s incorrect

8 0

3 years ago

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At body temperature (37°C), the rate constant of an enzymecatalyzed decomposition is 2.3X10¹⁴ times that of the uncatalyzed reac

schepotkina [342]

The activation energy is lowered by 85351.23 J/mol.

<h3>What is the activation energy?</h3>

The activation energy is the energy that is used to start a reaction.

In K = (In A) - (Ea / RT)

In K = (-Ea / RT) + In A

Where k = the activity constant

Ea = activation energy

R = molar gas constant

T = absolute temperature in Kelvin

In K₁ = (-Ea₁ / RT) + In A (eqn 1)

At point 2 with the catalyst

In K₂ = (-Ea₂ / RT) + In A (eqn 2)

Note that the molar gas constant, the absolute temperature in Kelvin, and the activity constant are all the same for both points.

Subtract (eqn 1) from (eqn 2)

In K₂ - In K₁ = (-Ea₂ / RT) - (-Ea₁ / RT) + In A - In A

In (K₂ / K₁) = (1/RT) (Ea₁ - Ea₂)

We were told that K₂ / K₁ = 2.3 × 10¹⁴, then find the difference in Ea

R = 8.314 J/mol.K, T = 37°C = 310.15 K

In (2.3 × 10¹⁴) = (1/ (8.314×310.15) (Ea₁ - Ea₂)

33.1 = (1/2578.5871) (Ea₁ - Ea₂)

(Ea₁ - Ea₂) = 33.1 × 2578.5871 = 85351.23 J/mol

Thus, the enzyme that lower the Ea is 85351.23 J/mol.

To learn more about activation energy, refer to the below link:

brainly.com/question/15114573

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8 0

2 years ago

35.6Ml of an HBr solution were tirated with 18.2 ml of a 0.115M naoh solution to reach equivance point. what is the molarity of

Gnom [1K]

Answer:

0.058 M

Explanation:

HBr reacts with NaOH and forms NaBr and H₂O as the products. The balanced equation is as follows:

$NaOH + HBr \implies NaBr + H_2O$

Molarity (M) = moles of solute (mol) / volume of the solution (L)

Molarity of NaOH = 0.115 M

Volume of NaOH = 18.2 mL = 18.2 x 10⁻³ L

So, moles of NaOH = molarity x volume of the solution

= 0.115 M x 18.2 x 10⁻³ L

= 2.093 x 10⁻³ mol

From the equation, we can see that the ratio between NaOH and HBr is 1 : 1.

Therefore, moles of HBr in 35.6 mL = moles of NaOH added = 2.093 x 10⁻³ mol

Hence, molarity of HBr = 2.093 x 10⁻³ mol / 35.6 x 10⁻³ L = 0.058 M

8 0

3 years ago

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What is the number of moles of kf in a 29-gram sample of the compound.

Irina18 [472]

Given

Weight of pottasium fluoride (KF) = 29 gms

To find

Number of moles of pottasium fluoride = ?

Solution

we know that molar mass of KF = 58.0967 g

Now,

$number \: of \: moles = \ \\ \frac{given \: weight \: of \: subtance}{molar \: mass}$

Number of moles = 29/58 = 0.5 moles

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2 years ago

A____molecule is an example of a carbohydrate

denpristay [2]

I think it’s CTell me if I’m wrong

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3 years ago