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iogann1982 [59]

2 years ago

7

A solvent has a freezing point of 10°C. What is the most likely freezing point if 5 grams of Salt is mixed with the solvent? (AK

S 5e)
Question 5 options:

15°C

20°C

5°C

10°C

2 answers:

sdas [7]2 years ago

6 0

$\huge{\color{hotpink}{Hola}}$

OLEGan [10]2 years ago

4 0

I think it’s 15, not sure though

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Solid sodium reacts with liquid water to form hydrogen gas according to the equation 2 Na(s) + 2 H₂O(l) → 2 NaOH(aq) + H₂(g) Wha

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3 years ago

6) (a) Calculate the absorbance of the solution if its concentration is 0.0278 M and its molar extinction coefficient is 35.9 L/

Anvisha [2.4K]

Answer:

6) (a) 0.499; (b) 31.7 %

7) 0.15

Explanation:

6) (a) Absorbance

Beer's Law is

$A = \epsilon cl\\A = \text{35.9 L&\cdot$mol$^{-1}$cm$^{-1}$} $\times$ 0.0278 mol$\cdot$L$^{-1} \times $ 0.5 cm = \mathbf{0.499}$

(b) Percent transmission

$A = \log {\left (\dfrac{1}{T}}\right)}\\\\\%T = 100T\\\\T = \dfrac{\%T}{100}\\\\\dfrac{1}{T} = \dfrac{100 }{\%T}\\\\A = \log \left(\dfrac{100 }{\%T} \right ) = 2 - \log \%T\\\\0.499 = 2 - \log \%T\\\\\log \%T = 2 - 0.499 = 1.501\\\\\%T = 10^{1.501} = \mathbf{31.7}$

7) Absorbance

$A = \log \left (\dfrac{I_{0}}{I} \right ) = \log \left (\dfrac{I_{0}}{0.70I_{0}} \right ) = \log \left (\dfrac{1}{0.70} \right ) = -\log(0.70) = \mathbf{0.15}}$

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2 years ago

Which of the following statements about tornadoes is false?

loris [4]

The answer is A because the time wouldn't affect the weather that much depending on the circumstances.

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2 years ago

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damaskus [11]

Answer is D

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Delicious77 [7]

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3 years ago