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3 years ago

11

The scientific method helps scientists avoid injecting which of the following into their experiments? a. information b. conclusi

ons c. hypotheses d. bias

2 answers:

7nadin3 [17]3 years ago

7 0

Bias. just did this in chemistry.

yanalaym [24]3 years ago

3 0

The answer is D. Bias

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At a certain temperature the rate of this reaction is first order in HI with a rate constant of 0.0632 s

kirza4 [7]

Answer:

$28.037\ \text{s}$

Explanation:

$[A]_0$ = Initial concentration = 1.28 M

$[A]$ = Final concentration = $0.17[A]_0$

k = Rate constant = 0.0632 s

t = Time taken

For first order reaction we have the relation

$kt=\ln\dfrac{[A]_0}{[A]}\\\Rightarrow t=\dfrac{\ln\dfrac{[A]_0}{[A]}}{k}\\\Rightarrow t=\dfrac{\ln\dfrac{[A]_0}{0.17[A]_0}}{0.0632}\\\Rightarrow t=28.037\ \text{s}$

Time taken to reach the required concentration would be $28.037\ \text{s}$ .

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To what volume should you dilute 60.0 mL of a 4.50 M KI solution so that 30.0 mL of the diluted solution contains 3.25 g of KI?

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Answer:

You should dilute to 414.1 mL

Explanation:

Let's apply the dilution formula to solve this:

M conc . Vol conc = M dil . Vol dil

Molarity for concentrated solution → 4.50 M

Volume for concentrated solution → 60 mL

Molarity for diluted solution → Unknown

Volume for diluted solution → Answer

Let's determine the molarity for diluted solution with data given.

We convert the mass of KI to moles

3.25 g . 1 mol/166 g = 0.0195 moles

Let's convert the volume from mL to L

30 mL . 1 L/1000mL = 0.030 L

Molarity (mol/L) = 0.0195 mol /0.030L = 0.652 M

We replace the data in the formula

4.50 M . 60 mL = 0.652 M . Volume for diluted solution

(4.50M . 60mL) / 0.652M = Volume for diluted solution

414.1 mL = Volume for diluted solution

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