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3 years ago

Physical properties can be divided into two categories. _ depend on the amount of matter present, while _ don't.

1 answer:

4 0

Extensive properties, such as mass and volume, depend on the amount of matter being measured. Intensive properties, such as density and color, do not depend on the amount of the substance present. Physical properties can be measured without changing a substance's chemical identity.

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Codeine C18H21NO3 is a weak organic base. A 5.0 x 10^-3 M solution of codeine has a pH of 9.95. Calculate the value of Kb for th

arsen [322]

Answer:

Kb = $4.45\times10^{-7}\ mol/L$

$p^{Kb}=6.35$

Explanation:

For a weak organic base, the formula to find $p^{OH}$ is given by:

$p^{OH}=p^{K_b}+\log c$

where c is the concentration of base.

Here c= $5\times10^{-3}\ M$

$p^{H}=9.95\\p^{OH}=14-p^{H}=14-9.95=4.05$

Substituting the above values in the formula,we get:

$p^{k_b}=p^{OH}-\log c\\p^{k_b}=4.05-\log (5\times10^{-3})\\p^{K_b}=6.35\\K_b=$antilog 6.35=4.45\times10^{-7}\ mol/L$

Hence:

Kb = $4.45\times10^{-7}\ mol/L$

$p^{Kb}=6.35$

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3 years ago

✎11. How does changing the Amplitude affect the wavelength?

ASHA 777 [7]

What grade are you in

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2 years ago

H fygykg,hyf ggyhgfsdyhcjsgvfufdgyvyghxhjlkfdhgjkygucdsgyifdc \

kirza4 [7]

Well thats a pretty difficult question, I think the answer might be 4

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3 years ago

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What would you expect from an endothermic reaction?

Zanzabum

D. The products will have more energy than the reactants.

6 0

3 years ago

Calculate the energy for one mole of photons (an einstein) for light absorbed at 6.90 × 102 nm.

Kay [80]

We know that:
f * λ = c
and
E = h*f
so,rearranging:

E/h = C/λ
given:
h = 6.90 × 10^2 nm

substituting the values:

E = C/λ x h
(c is the speed of light;that is 3x10^8 m/s)

 = 3x10^8 x 6.626x10^-34 / 6.90 x10^7m x 6.022x10^23
Hence,
using calculator:
we get,
E = 1.69 x 10^5 Joules

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3 years ago

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Physical properties can be divided into two categories. _______ depend on the amount of matter present, while _______ don't.

Physical properties can be divided into two categories. _ depend on the amount of matter present, while _ don't.