What Element has a -4 oxidation number.

Instructions: Complete each question by choosing or typing in the best answer. To receive the highest score, be sure to leave no

babymother [125]

A theory does not change into a scientific law with the accumulation of new or better evidence. A theory will always remain a theory

5 0

3 years ago

When a aqueous solution of a certain acid is prepared, the acid is dissociated. Calculate the acid dissociation constant of the

stepan [7]

<h2> $K_a$ = $\dfrac{[H^{+}] [A^{-}]}{[HA]}$ </h2>

Explanation:

When an aqueous solution of a certain acid is prepared it is dissociated is as follows-

${\displaystyle {\ce {HA$ ⇄ ${H^+}+{A^{-}}} }}$

Here HA is a protonic acid such as acetic acid, $CH_3COOH$

The double arrow signifies that it is an equilibrium process, which means the dissociation and recombination of the acid occur simultaneously.

The acid dissociation constant can be given by -

$K_a$ = $\dfrac{[H^{+}] [A^{-}]}{[HA]}$

The reaction is can also be represented by Bronsted and lowry -

$\\{\displaystyle {\ce {{HA}+ H_2O}$ ⇄ $[H_3O^+] [A^-]$

Then the dissociation constant will be

$K_a$ = $\dfrac{[H_3O^{+}] [A^{-}]}{[HA]}$

Here, $K_a$ is the dissociation constant of an acid.

6 0

4 years ago

a balloon is filled with 3.60 L of H2 gas at STP. If the balloon is taken into the sea where the pressure is 2.50 atm and the te

kherson [118]

The new volume of the hydrogen gas in the balloon is 1.5 L.

<u>Explanation:</u>

At STP, Temperature, T1 is 0° C = 0 + 273 K = 273 K

Pressure, P1 = 1 atm

Here given volume, V1 = 3.60 L

Balloon at sea,

Pressure, P2 = 2.5 atm

Temperature, T2 = 10° C = 10 + 273 = 283 K

Volume, V2 = ?

Here, we have to use the equation,

$$\frac{P1V1}{T1} = \frac{P2V2}{T2}$

We have to rearrange the equation to get V2 as,

$$V2 = \frac{P1V1T2}{T1P2}$

Now plugin the values as,

V2 = $$\frac{1 atm \times 3.6 L \times 283 K}{273 K \times 2.5}$

= 1.5 L

So the new volume of the hydrogen gas is 1.5 L.

7 0

4 years ago

Read 2 more answers

Which of the following is a scientific question about the cuttlefish?

Svetach [21]

The answer is A. How does the cuddle fish change its colors ?

8 0

3 years ago

Read 2 more answers

: A ____________ is an arrow that shows the strength and direction of a force.

Sonbull [250]

Answer:

Force arrows are used to represent both the magnitude and direction of forces. The length of the arrow corresponds to the magnitude of the force, with longer arrows indicating forces with larger magnitudes. :) hope this helps

Explanation:

3 0

3 years ago