2 years ago

What was one of the first series of event in the study of chemistry

1 answer:

7 0

Discovered and isolated radium and polonium in 1898

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cricket20 [7]

It would be A, the molecules should be closely packed together but arranged randomly. :)

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scoray [572]

I think they start to deflate bc of gravity.

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Otrada [13]

Answer:

We can't see the options so we don't know what we can put

Explanation:

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2 years ago

spin [16.1K]

Oxygen (6O2) and Glucose (C6H12O6)

<span>Reference: 6CO2 + 6H2O + light energy = C6H12O6 + 6O2.</span>

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2 years ago

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

3 0

2 years ago