3 years ago

Why do lungfish walk on land?

1 answer:

6 0

Answer:

The new findings support the theory that walking first arose underwater, preceding the move onto land and the development of toes and limbs adapted to land perambulation.

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Is this statement true or false? Gymnosperms reproduce using seeds, but angiosperms do not.

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FALSE!

Explanation:

Gymnosperms do use seeds but are exposed like the pine cones of pines. Angiosperms still have seeds, however, they flower or fruit.

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What is the total oxidation state of the fluorine atoms

Arte-miy333 [17]

Answer:

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Which chemical property makes a substance suitable as a fuel?

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30 mL of 0.25 M acetic acid are titrated with 0.05 M KOH. What is the pH after addition of 75 mL KOH? Group of answer choices

hjlf

Answer:

The PH of the mixture is 4.74

Explanation:

The number of millimoles of acetic acid is calculated using the formula:

No of millimoles= Molarity * Volume( in ml)

= 0.25M * 30ml = 7.5 moles

Number of millimoles of KOH is calculated using:

Number of millimoles = Molarity * Volume ( in ml)

=0.05M * 75ml

= 3.75 moles

The PH of the solution is derived using:

pH = pKa + log [salt] / acid

= $-log [ 1.8 * 10^5 ] + log [ 3.75 mmoles/ 3.75 mmoles]$

=4.74

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Petroleum is a mixture consisting mostly of _____.

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A liquid mixture of Hydrocarbons

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