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3 years ago

5

1) What is bioluminescence?

1 answer:

Yuki888 [10]3 years ago

7 0

Bioluminescence is
the biochemical emission of light by living organisms. Bioluminescence occurs through a chemical reaction that produces light energy within an organism's body. For a reaction to occur, a species must contain luciferin, a molecule that, when it reacts with oxygen, produces light.

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Place the following in order of increasing X-Se-X bond angle, where X represents the outer atoms in each molecule. SeO2 SeCl6 Se

GalinKa [24]

Answer:

SeCl₆ < SeF₂ < SeO₂

Explanation:

(A) SeO₂

The central atom has 2 bond pairs and 1 lone pair. The molecule is bent shaped which has an angle of 120°.

(B) SeCl₆

The central atom has 6 bond pairs and 0 lone pair. The geometry is octahedral in which the equatorial bonds has an angle of 90° and axial bond has an angle of 90°.

(C) SeF₂

The central atom has 2 bond pairs and 2 lone pairs. The geometry is bent shape which has an angle of approximately 105.5°.

The order is:

<u>SeCl₆ < SeF₂ < SeO₂</u>

5 0

3 years ago

"acid is responsible for the odor in rancid butter. a solution of 0.25 m butyric acid has a ph of 2.71. what is the ka for"

Salsk061 [2.6K]

Answer:- The Ka for the acid is $1.53*10^-^5$ .

Solution:- In general, monoprotic acid could be represented by HA. The dissociation equation for the ionization of HA is written as:

HA(aq)\rightarrow H^+(aq) + A^-(aq)

Now, we make the ice table for this equation as:

HA(aq)\rightarrow H^+(aq) + A^-(aq)

I 0.25 0 0

C -X +X +X

E (0.25 - X) X X

where, I stands for initial concentration, C stands for change in concentration and E stands for equilibrium concentration.

X is the change in concentration and from ice table it's same as the concentration of hydrogen ion that is calculated from given pH.

$Ka = [H^+][A^-]\frac{1}{HA}$

Where, Ka is the acid ionization constant. Let's plug in the values.

$Ka = \frac{X^2}{0.25-X}$

Let's calculate the value of X first using the equation:

$pH = -log[H^+]$ [/tex]

on taking antilog ob above equation we get:

$[H^+]=10^-^p^H$

$[H^+]=10^-^2^.^7^1$

$[H^+]$ = 0.00195

So, X = 0.001195

Let's plug in this value of X in the equation:-

$Ka=\frac{(0.00195)^2}{0.25-0.00195}$

$Ka=1.53*10^-^5$

So, the value of Ka for butyric acid is $1.53*10^-^5$ .

8 0

3 years ago

Read 2 more answers

Please help me and I’ll give you brainiest!!!!!!!!! <br><br><br><br> Have a wonderful day!!:)))

Step2247 [10]

Answer:

up down up down thats the pattern

Explanation:

5 0

2 years ago

What is the number after an element in a chemical equation called? Example: H2

Sophie [7]

Answer:

the answer to your problem is A.Subscript...BRAINLIEST

6 0

3 years ago

The electrons involved in forming chemical bonds are the what electrons

Helga [31]

The valence electrons should be the correct answer

8 0

3 years ago