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2 years ago

Which is an example of a compound?

Chemistry

1 answer:

makkiz [27]2 years ago

5 0

Answer:

Octane - Formula: C8H^18 = Carbon^8 + Hydrogen^18

Explanation: Octane is a compound because there are 8 atoms of carbon and 18 atoms of hydrogen in one molecule of C8H18. There are also 8 moles of carbon and 18 moles of hydrogen.

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What happens to the temperature of the remaining liquid when some of the liquid evaporates

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Turns into vapor. not all of the molecules are liquid have the same energy

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2 years ago

Physical Science pre-Test 2020-2021

poizon [28]

Answer:

exothermic I think

Explanation:

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2 years ago

What describes a change that occurs when one substance reacts to another substance?

Slav-nsk [51]

A chemical or physical change

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3 years ago

The rate constant for a certain reaction is measured at two different temperatures:

Talja [164]

Answer: The activation energy Ea for this reaction is 22689.8 J/mol

Explanation:

According to Arrhenius equation with change in temperature, the formula is as follows.

$ln \frac{k_{2}}{k_{1}} = \frac{-E_{a}}{R}[\frac{1}{T_{2}} - \frac{1}{T_{1}}]$

$k_1$ = rate constant at temperature $T_1$ = $2.3\times 10^8$

$k_2$ = rate constant at temperature $T_2$ = $4.8\times 10^8$

$E_a$ = activation energy = ?

R= gas constant = 8.314 J/kmol

$T_1$ = temperature = $280.0^0C=(273+280)=553K$

$T_2$ = temperature = $376.0^0C=(273+376)=649K$

Putting in the values ::

$ln \frac{4.8\times 10^8}{2.3\times 10^8} = \frac{-E_{a}}{8.314}[\frac{1}{649} - \frac{1}{553}]$

$E_a=22689.8J/mol$

The activation energy Ea for this reaction is 22689.8 J/mol

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2 years ago

Important of organic chemistry in nursing

sasho [114]

Answer:

Nurses must use organic chemistry to determine how the bodies of their patients metabolized glucose, and how the body reacts to it.

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1 year ago