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Inga [223]
3 years ago
8

Why do scientists need control groups?

SAT
1 answer:
lubasha [3.4K]3 years ago
3 0

Explanation:

A scientific control group is an essential part of many research designs, allowing researchers to minimize the effect of all variables except the independent variable. The control group, receiving no intervention, is used as a baseline to compare groups and assess the effect of that intervention.

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When the 0.10 m solution of hclo2 is allowed to come to equilibrium, what percent of the acid molecules are ionized?
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If 0.10 m solution of hclo2 is allowed to come to equilibrium, the percent of the acid molecules that is ionized is 29%

We have

HClO2 = 0.1 mole = 0.012

HClO + H2O ⇄ ClO₂⁻ + H₂O

Ka = 0.1α x 0.1α / 0.1(1-α)

= 0.1α²/1-α = 0.12

We have to form a quadratic equation from the above

0.1α² = 0.012 - 0.12α

We write the equation to be

0.1α² + 0.012 - 0.12α = 0

To solve the equation above, the quadratic formula calculator was used.

\frac{-b+-\sqrt{b^2-4ac} }{2}

alpha = 0.29

This is 29 percent. Therefore the percentage of ionization is 29%.

<h3>What is ionization?</h3>

This is the process through which neutral ions are chraged to become electrically charged.

Read more on ionizations here: brainly.com/question/1445179

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Answer:

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All of the following are effective countermeasures of fatigue except:
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All of the following are effective countermeasures of fatigue except: D. Allowing your eyes to lose focus.

<h3>What is a countermeasure?</h3>

This is the term that helps to describe something that helps a person to fight against another thing. The counter measure is usually what is taken in order to prevent something from happening or occurring.

Here fatigue has to do with the fact that a person is tired, worn out and they need to rest well in order to continue functioning properly in the chores or the tasks that they are known to indulge in.

When a person is tired they would have issues with their eyes enabling them to focus on what they are doing.

Read more on fatigue here: brainly.com/question/12564121

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