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1 year ago

12. What structures does the fish have that are NOT present in the fly?

1 answer:

5 0

Fish are cold-blooded creatures having a backbone, gills, and fins. The head, trunk, and tail make up a normal fish's body. Two eyes, each with a well-developed nictitating membrane, two internal ears, two nostrils closed internally (except in lungfishes), and a mouth are found on the head.

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Consider the following equilibrium: H2CO3+H2O = H3O+HCO3^-1. What is the correct equilibrium expression?

mylen [45]

Equilibrium expression is $Keq = \frac{[H3O+][HCO3^-]}{[H2CO3]}\\$

<u>Explanation:</u>

Equilibrium expression is denoted by Keq.

Keq is the equilibrium constant that is defined as the ratio of concentration of products to the concentration of reactants each raised to the power its stoichiometric coefficients.

Example -

aA + bB = cC + dD

So, Keq = conc of product/ conc of reactant

$Keq = \frac{[C]^c [D]^d}{[A]^a [B]^b}$

So from the equation, H₂CO₃+H₂O = H₃O+HCO₃⁻¹

$Keq = \frac{[H3O^+]^1 [HCO3^-]^1}{[H2CO3]^1 [H2O]^1}$

The concentration of pure solid and liquid is considered as 1. Therefore, concentration of H2O is 1.

Thus,

$Keq = \frac{[H3O+][HCO3^-]}{[H2CO3]}\\$

Therefore, Equilibrium expression is $Keq = \frac{[H3O+][HCO3^-]}{[H2CO3]}\\$

4 0

3 years ago

What does absolute zero physically mean at the particle level? <br> ASAP!

antoniya [11.8K]

Answer:

Absolute zero is the lowest limit of the thermodynamic temperature scale, a state at which the enthalpy and entropy of a cooled ideal gas reach their minimum value, taken as zero kelvin.

7 0

2 years ago

2 H2 + O2 → 2 H2O<br> Is the reaction balanced?

Alinara [238K]

Yeas, the reaction is balanced

6 0

3 years ago

Can some answer this please?

marysya [2.9K]

Answer:

Explanation:

it's b because I just went over that frome my class and got it correct

4 0

3 years ago

Read 2 more answers

Sodium electron configuration

Alex73 [517]

Full:

1s² 2s² 2p⁶ 3s¹

Abbreviated:

[Ne] 3s¹

4 0

3 years ago