The seasons. This is because when Earth is on an angle, different parts of the world get different amounts of heat, making temperatures different, and therefore changing the environment.

4 0

2 years ago

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Which is a change or signal in the environment that can make an organism

nadya68 [22]

Answer:

I'm pretty sure its stimulus

7 0

2 years ago

A stock phenolphthalein solution was prepared by dissolving 0.050 g in a total volume of 100.0 ml. You place one drop (0.050 ml)

devlian [24]

Answer:

the value of molar absorptivity is 229000 $M^{-1} cm^{-1}$

Explanation:

given data

phenol phthalein solution = 0.050 g

total volume = 100.0 ml

dilute = 100.0 ml

diluted sample = 0.18

solution

we get here concentration that is express as

concentration = ( mass of solute × 1000 ) ÷ ( molar mass of solute × volume of solution ) .............1

put here value

concentration = $\frac{0.050\times 1000}{318.32\times 100}$

concentration = 0.00157 M

and here dillution equation is express as

c1 × v1 = c2 × v2 .................2

here c1 and c2 is initial and final concentration

and v1 and v2 is initial and final volume

put here value

0.001571 × 0.050 = c2 × 100

c2 = 7.855 × $10^{-7}$ M

and

now we get molar by absorbance equation that is

A = E × C × l ................3

here A is absorbance and E is molar and c is absorptivity and l is path length

put here value

0.18 = E × 7.855 × $10^{-7}$ × 1

E = 229000 $M^{-1} cm^{-1}$

3 0

2 years ago