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snow_tiger [21]
3 years ago
11

Complete the following statements about the functions of the digestive system. The starts an involuntary swallowing action when

it senses food. The squeezes food down the digestive tract by an involuntary synchronized muscle movement called . Food that has been digested in the is processed into a thick liquid called .
Chemistry
1 answer:
Eduardwww [97]3 years ago
5 0

Answer:

pharynx esophagus peristalsis chyme

Explanation:

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The ka for hcn is 4.9 ⋅ 10-10. What is the value of kb for cn-?
marusya05 [52]

Answer:

kb = 2,0x10⁻⁵

Explanation:

The ka for HCN is:

HCN ⇄ H⁺ + CN⁻; ka = 4,9x10⁻¹⁰ <em>(1)</em>

The inverse reaction has an equilibrium constant of:

H⁺ + CN⁻ ⇄ HCN k = 1/4,9x10⁻¹⁰ = 2,0x10⁹ <em>(2)</em>

As the equilibrium of the water is:

H₂O ⇄ H⁺ + OH⁻; kw = 1x10⁻¹⁴ <em>(3)</em>

The sum of (2) + (3) gives:

H₂O + CN⁻ ⇄ HCN + OH⁻; kb = kw×k = 1x10⁻¹⁴×2,0x10⁹ =

2,0x10⁻⁶; <em>kb = 2,0x10⁻⁵</em>

<em />

<em>-In fact, the general formula to convert from ka to kb is:</em>

<em>kb = kw / ka-</em>

<em />

I hope it helps!

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3 years ago
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How many moles are in 428 L of chlorine gas
djyliett [7]

Answer:

19.3 moles

Explanation:

In order to calculate the number of moles of Chlorine gas from the volume, we have to calculate its mass from its known density using the formula:

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3.2 = mass/428

mass = 428 × 3.2

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6 0
3 years ago
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