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4 years ago

11

Im chemistry we are solving chemical reactions and on the assignments our teacher put the questions as riddels and I can not get

this one:
What can you "THROW" and not "CATCH"?

What is the answer?

1 answer:

lara31 [8.8K]4 years ago

6 0

Are they trying to be funny about it?

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Substance A undergoes a first order reaction A  B with a half- life of 20 min at 25 °C. If the initial concentration of A ([A]◦

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The concentration of A will be <em>0.34 mol·L⁻¹</em> after 60 min.

In a first-order reaction, the formula for the amount remaining after <em>n</em> half-lives is

$\text{[A]} = \frac{\text{[A]}_{0}}{2^{n}}\\$

If $t_{\frac{1}{2}} = \text{20 min}\\$

$n = \frac{t}{t_{\frac{1}{2}}} = \frac{\text{60 min}}{\text{20 min}}= \text{3.0}$

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3 years ago

When a ketone and its enol are in equilibrium, under most conditions the concentration of the enol is __________ the concentrati

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Answer:

D). Much lower than

Explanation:

When a ketone and its enol are in equilibrium, under most conditions the concentration of the enol is <u>Much lower than</u> the concentration of the ketone

because :

Carbon- oxygen bond is more stable(stronger) than Carbon-Carbon Bond

Keto - enol tautomerism is :

$H -C-C=O \rightleftharpoons C=C-O-H$

Ketone has C=O and enol has C=C

C=O bond energy is 745 kJ/mol

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3 years ago

When an egg is placed in a hot frying pan, the yolk and white become firmer and more opaque, and steam is emitted.

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Explanation:

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3 years ago

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The rate of dissolution for a solid solute decreases when you stop stirring it.

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3 years ago

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Answer:

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Explanation:

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