Acertain first-order reaction (a→products) has a rate constant of 8.10×10−3 s−1 at 45 ∘c. how many minutes does it take for the concentration of the reactant, [a], to drop to 6.25% of the original concentration? express your answer with the appropriate units.

The answer is 5.7 minutes

Explanation:

A first-order reaction follow the law of . Where [A] is the concentration of the reactant at any t time of the reaction, is the concentration of the reactant at the beginning of the reaction and k is the rate constant.

Dropping the concentration of the reactant to 6.25% means the concentration of A at the end of the reaction has to be . And the rate constant (k) is 8.10×10−3 s−1

Replacing the equation of the law:

Clearing the equation:

Considering the property of logarithms:

Using the property:

Clearing t and solving:

The answer is in the unit of seconds, but every minute contains 60 seconds, converting the units:

chemists can use the electron cloud model to assign electrons to different atomic orbitals. atomic orbitals also explain the patterns in the periodic table

explanation:

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explanation:

covalent bonds

consist of pairs of electrons shared by two atoms, and bind the atoms to fixed orientation and requre high energies to break them

ionic bonds

when two atoms differ considerably in their electronegativity, then one of the atoms will lose its electron to the other atom. this results in a positively charged ion(cation) and a negatively charged ion (anion)