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3 years ago

Chemicals that are able to reduce activation energy in a reaction and speed the reaction rate are

Chemistry

2 answers:

Ilia_Sergeevich [38]3 years ago

8 0

Answer:

It is D, I just did the assignment

Explanation:

SOVA2 [1]3 years ago

3 0

I believe it's D. A catalyst causes an increases the rate of a reaction without itself being consumed.

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When a 0. 1 m aqueous solution of hydrocyanic acid, hcn, reaches equilibrium, the ph is measured to be 5. 20. using this informa

Sav [38]

When a 0. 1 m aqueous solution of hydrocyanic acid, HCN, reaches equilibrium, the ka for hydrocyanic acid is 3.969 x 10⁻¹⁰.

<h3>What is ka value?</h3>

It's the value of equilibrium constant for the dissociation of ions into a solution. The more the Ka value the more will be dissociation.

Ka = [H₃O⁺]² / [HCN] [H₃O⁺]

The pH is 5.20

-log [H₃O⁺] = 5.20

Putting antitlog both side.

The value will be 6.30 x 10⁻⁶

Ka = (6.30 x 10⁻⁶)² / 0.1 - 6.30 x 10⁻⁶

0.1 - 6.30 x 10⁻⁶ = 0.1

Ka = 3.969 x 10⁻¹⁰

Thus, the Ka value for hydrocyanic acid is 3.969 x 10⁻¹⁰.

To learn more about ka value, refer to the link:

brainly.com/question/2796803

#SPJ4

7 0

2 years ago

Question 10

Rainbow [258]

Answer:

Explanation:

jus bc

6 0

3 years ago

NEED HELP

Leona [35]

<h3>Zinc +oxygen - zinc oxide</h3>

<h3>chlorine+ magnesium - magnesium dichloride</h3><h3>iron + arsenic - ferric arsenate</h3>

<h2> Hope it is helpful for you</h2>

5 0

3 years ago

Which quantity can be calculated using the equation E=MC^2

r-ruslan [8.4K]

Answer:

The energy needed to split an atom into separate protons, neutrons, and electrons

Explanation:

The equation E = MC^2 is developed by Einstein’s Special Relativity Theory

where,

E = Energy

M = mass

C = speed of the light

The energy should be measured in Joules i.e J

The mass should be measured in Kilogram i.e Kg

And, the speed of the light should be measured in meters per second i.e ms-1

The C should be squared

Now the energy is required to divided into three particles i.e protons, electrons and neutrons

It also needs to allocate the nucleus into distinct protons and neutrons that we called binding energy of nuclear

And if the energy is required to take off an electron from an atom we called the energy of ionization

And if the energy is required to add an electron to an atom so we called it affinity of electron

8 0

3 years ago

A chemist dissolves 249.mg of pure perchloric acid in enough water to make up 380.mL of solution. Calculate the pH of the soluti

Alla [95]

Answer:

pH = 2.18

Explanation:

Perchloric acid (HClO₄) is a strong acid. This means that in an aqueous solution it completely dissociates into H⁺ and ClO₄⁻ species.

First we convert 249 mg HClO₄ into moles, using its molecular weight:

249 mg HClO₄ ÷ 100.46 mg/mmol = 2.49 mmol HClO₄

Because it is a strong acid, 2.49 mmol HClO₄ = 2.49 mmol H⁺

We calculate the molar concentration of H⁺:

2.49 mmol H⁺ / 380 mL = 6.52x10⁻³ M

Finally we calculate the pH of the solution:

pH = -log[H⁺] = -log(6.52x10⁻³)

pH = 2.18

4 0

3 years ago