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Keith_Richards [23]
3 years ago
6

Most strings of outdoor lights are wired in a parallel circuit. Which of the following is the best reason why a string of outdoo

r lights should be wired in a parallel circuit and not a series circuit?
A.Parallel circuits are safer to use than series circuits.
B.The lights in a parallel circuit will light up brighter than the lights in a series circuit.
C.If one light in the string burns out in a parallel circuit, the rest of the lights will continue to shine.
D.You need to use more wires to construct a series circuit than a parallel circuit.
Chemistry
1 answer:
sergey [27]3 years ago
5 0

Answer:

C.If one light in the string burns out in a parallel circuit, the rest of the lights will continue to shine.

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Write E in the blank if the material is heterogeneous or O if it is homogeneous.
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Answer/Explanation:

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Any mixture that looks the same through the substance is homogenous. The different parts are unable to be visibly seen. (Any periodic element is homogenous)

Any mixture that can be easily determined a mix and cannot be evenly separated or dispersed is heterogenous.

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A

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Answer:

pH = 12.33

Explanation:

Lets call HA = butanoic acid and A⁻ butanoic acid and its conjugate base butanoate respectively.

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number of moles of HA :   118.3 ml/1000ml/L x 0.3500 mol/L = 0.041 mol HA

number of  moles of OH  : 115.4 mL/1000ml/L x 0.400 mol/L  = 0.046 mol A⁻

therefore the weak acid will be completely consumed and what we have is  the unreacted strong base KOH which will drive the pH of the solution since the contribution of the conjugate base is negligible.

n unreacted KOH = 0.046 - 0.041 = 0.005 mol KOH

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M KOH = 0.005 mol / (0.118.3 +0.1154)L = 0.0021 M

pOH = - log (0.0021) = 1.66

pH = 14 - 1.96 = 12.33

Note: It is a mistake to ask for the pH of the <u>acid solutio</u>n since as the above calculation shows we have a basic solution the moment all the acid has been consumed.

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