3 years ago

98 POINTS!!! WILL AWARD BRAINLIST!! EXTRA POINTS!! PLS HELP!!

2 answers:

4 0

Answers are at the pdf.

Since there are 16 questions, all answers cannot be uploaded because number of characters is beyond the limit.

4 0

I'm pretty sure the answer to the first question is B, i think

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Sliva [168]

Answer:

I am not sure about this question sry but u can try asking a tutor

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Julli [10]

Question 5 is the second one.

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makkiz [27]

Effervescence of h2 gas will be produced which burns off a glowing split with a pop sound when hcl reacts with a base

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4 years ago

Dmitrij [34]

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3 years ago

nydimaria [60]

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

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

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

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

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

∴ $\text{[A]} = \frac{\text{2.7 mol/L}}{2^{3.0}} = \frac{\text{2.7 mol/L}}{8.0} = \textbf{0.34 mol/L}$

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3 years ago