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3 years ago

Chemistry can be explained as the study of the properties and reaction of substance.

Chemistry

2 answers:

Romashka [77]3 years ago

7 0

The answer was to question is true

MA_775_DIABLO [31]3 years ago

5 0

the answer is a.) true

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Can u guys please answer this What plasma looks like on the molecular level?

meriva

They look like gases plasmas have no fixed shapes or volume and are less dense tan solids or liquids

5 0

3 years ago

Read 2 more answers

Phosphoric acid is a triprotic acid ( K a1 = 6.9 × 10 − 3 Ka1=6.9×10−3, K a2 = 6.2 × 10 − 8 Ka2=6.2×10−8, and K a3 = 4.8 × 10 −

irina1246 [14]

Answer: To calculate the pH of the buffer composed of $H_2PO_4^-\text{ and }HPO_4^{-2}$ , we use the $K_a2$

Explanation:

Phosphoric acid is a triprotic acid and it will undergo three dissociation reaction each having their respective dissociation constants.

The chemical equation for the first dissociation reaction follows:

$H_3PO_4\rightleftharpoons H_2PO_4^-+H^+;K_a1=6.9\times 10^{-3}$

The chemical equation for the second dissociation reaction follows:

$H_2PO_4^-\rightleftharpoons HPO_4^{2-}+H^+;K_a2=6.2\times 10^{-8}$

The chemical equation for the third dissociation reaction follows:

$HPO_4^{2-}\rightleftharpoons PO_4^{3-}+H^+;K_a3=4.8\times 10^{-13}$

To form a buffer composed of $H_2PO_4^-\text{ and }HPO_4^{-2}$ , we use the $K_a$ of second dissociation process

To calculate the $pK_a$ , we use the equation:

$pK_a=-\log (K_a)\\\\pK_a=-\log(6.2\times 10^{-8})\\\\pK_a=7.21$

To calculate the pH of buffer, we use the equation given by Henderson Hasselbalch:

$pH=pK_a2+\log(\frac{[\text{conjugate base}]}{[\text{weak acid}]})$

$pH=pK_a2+\log(\frac{[HPO_4^{2-}]}{[H_2PO_4^-]})$

We are given:

$pK_a2$ = negative logarithm of second acid dissociation constant of phosphoric acid = 7.21

$[HPO_4^{2-}]$ = concentration of conjugate base

$[H_2PO_4^{-}]$ = concentration of weak acid

Hence, to calculate the pH of the buffer composed of $H_2PO_4^-\text{ and }HPO_4^{-2}$ , we use the $K_a2$

3 0

4 years ago

The electronic configuration of an element is 1s^2 2s^2 2p^6. Hkw many valence electrons does it have

Aliun [14]

It has 8 valence electrons.

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4 years ago

predict what will happen to the ammonia equilibrium system if hydrogen gas (H2) is added in the following reaction. N2(g) + 3H2(

labwork [276]

According to the Le Chatelier's Principle, if a condition of system is changed, then the system try to become equilibrium again by correcting that change.

N2(g) + 3H2(g) ⇄ 2NH3(g)

If H2(g) is added, then the concentration of H2(g) is high in the system. So the system tries to reduce it and become to equilibrium state. Hence to reduce that H2(g) the forward reaction is promoted. Then Concentration of product, NH3 gas is increased.

4 0

3 years ago

Identify each type of bond:

zloy xaker [14]

Answer:

The type of bond between the Oxygen atom and the hydrogen is Covalent

this is because the 2 electrons are being shared by both hydrogen and oxygen

The type of bond this molecule makes as a whole is called a Hydrogen Bond

A hydrogen bond is formed because of the partial +ve and -ve charge in a molecule

The cause of the partial +ve and -ve charge is the comparatively high electronegativity of oxygen which makes the electron get attracted towards the oxygen atom while the hydrogens try to maintain the maximum distance from the lone pairs due to repulsion

Hope it helped

Kindly Mark Brainliest

6 0

4 years ago