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3 years ago

Which observation could you make based on stimuli to your photoreceptors?(1 point)

Chemistry

1 answer:

Montano1993 [528]3 years ago

6 0

Answer:

last one which is d

Explanation:

thankskd

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Prove that the liquid pressure is directly proportional to the depth of the liquid?

Free_Kalibri [48]

Explanation:

Pressure and depth have a directly proportional relationship. This is due to the greater column of water that pushes down on an object submersed.. so the deeper the liquid level the higher the pressure of the liquid.

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3 years ago

Help science worth 50 points

monitta

Answer:

I think this is like a game in which you need dice.

Explanation:

To fill out the second page, you need to complete the roll/go-to chart.

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4 years ago

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A 1.50 L buffer solution is 0.250 M in HF and 0.250 M in NaF. Calculate the pH of the solution after the addition of 0.100 moles

alexgriva [62]

Answer : The pH of the solution is, 3.41

Explanation :

First we have to calculate the moles of $HF$ .

$\text{Moles of HF}=\text{Concentration of HF}\times \text{Volume of solution}$

$\text{Moles of HF}=0.250M\times 1.50L=0.375mol$

Now we have to calculate the value of $pK_a$ .

The expression used for the calculation of $pK_a$ is,

$pK_a=-\log (K_a)$

Now put the value of $K_a$ in this expression, we get:

$pK_a=-\log (6.8\times 10^{-4})$

$pK_a=4-\log (6.8)$

$pK_a=3.17$

The reaction will be:

$HF+OH^-\rightleftharpoons F^-+H_2O$

Initial moles 0.375 0.100 0.375

At eqm. (0.375-0.100) 0 (0.375+0.100)

= 0.275 = 0.475

Now we have to calculate the pH of solution.

Using Henderson Hesselbach equation :

$pH=pK_a+\log \frac{[Salt]}{[Acid]}$

$pH=pK_a+\log \frac{[F^-]}{[HF]}$

Now put all the given values in this expression, we get:

$pH=3.17+\log [\frac{(\frac{0.475}{1.50})}{(\frac{0.275}{1.50})}]$

$pH=3.41$

Thus, the pH of the solution is, 3.41

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3 years ago

Which statement must be mentioned in explaining why amphipathic molecules line up at a water surface?Which statement must be men

Ray Of Light [21]

Answer:

it would be c

Explanation:

hsjsjsys be ndusgendidysbnekeysbsnwkudgdnsksusbsns8sgebneidysbneksusgwbneod6zgsmsisysbwnksusgwnejdybsksue

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4 years ago

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In caves, dripping groundwater containing calcium bicarbonate can form stalactites and stalagmites. When the water is exposed to

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The right answer for the question that is being asked and shown above is that: "E. This process involves breaking and reshaping of substances, which is an an important clue to chemical change." The process of a chemical change is that it involves breaking and reshaping of substances, which is an an important clue to chemical change.<span>
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3 years ago

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