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Umnica [9.8K]
3 years ago
11

In his science class, Mr. Brown heats a small amount of iodine in a test tube. The iodine changes into a pink gas without changi

ng into liquid. What is this process called
A) condensation
B) deposition
C) evaporation
D) melting
E) sublimation
Chemistry
2 answers:
avanturin [10]3 years ago
4 0

the answer is sublimation or E              

umka21 [38]3 years ago
3 0
The answer is sublimation 
sublimation is the process that turns from solid directly into a gas without turning into a liquid first
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Determine the rate of a reaction that follows the rate law rate = k a m b i where
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(missing part of your question):
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4. Find the pH at each of the following points in the titration of 25 mL of 0.3 M HF with 0.3 M NaOH. The Ka value is 6.6x10-4 a
yawa3891 [41]

Explanation:

Since HF is a weak acid, the use of an ICE table is required to find the pH. The question gives us the concentration of the HF.

HF+H2O⇌H3O++F−HF+H2O⇌H3O++F−

Initial0.3 M-0 M0 MChange- X-+ X+XEquilibrium0.3 - X-X MX M

Writing the information from the ICE Table in Equation form yields

6.6×10−4=x20.3−x6.6×10−4=x20.3−x

Manipulating the equation to get everything on one side yields

0=x2+6.6×10−4x−1.98×10−40=x2+6.6×10−4x−1.98×10−4

Now this information is plugged into the quadratic formula to give

x=−6.6×10−4±(6.6×10−4)2−4(1)(−1.98×10−4)−−−−−−−−−−−−−−−−−−−−−−−−−−−−√2x=−6.6×10−4±(6.6×10−4)2−4(1)(−1.98×10−4)2

The quadratic formula yields that x=0.013745 and x=-0.014405

However we can rule out x=-0.014405 because there cannot be negative concentrations. Therefore to get the pH we plug the concentration of H3O+ into the equation pH=-log(0.013745) and get pH=1.86

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