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Dafna11 [192]
3 years ago
14

Electric cables for your lamp have a plastic rubber coating around the wire. Explain why this material surrounds the metal cable

.
Chemistry
1 answer:
kvasek [131]3 years ago
4 0

Porque ese material no permite que la electricidad pase por nuestro cuerpo al tocar el cable de lo contrario resibiriamos una pequeña descarga eléctrica (según los voltios que tenga) también se puedo con otras materiales (el cuero) pero no son tan confiables

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How many half-lives are required for the concentration of reactant to decrease to 1.56% of its original value?4247.56.56
neonofarm [45]

Answer:

6 half-lives are required for the concentration of reactant to decrease to 1.56% of its original value.

Explanation:

Using integrated rate law for first order kinetics as:

[A_t]=[A_0]e^{-kt}

Where,

[A_t] is the concentration at time t

[A_0] is the initial concentration

Given:

Concentration is decreased to 1.56 % which means that 0.0156 of [A_0] is decomposed. So,

\frac {[A_t]}{[A_0]} = 0.0156

Thus,

\frac {[A_t]}{[A_0]}=e^{-k\times t}

0.0156=e^{-k\times t}

kt = 4.1604

The expression for the half life is:-

Half life = 15.0 hours

t_{1/2}=\frac {ln\ 2}{k}

Where, k is rate constant

So,  

k=\frac {ln\ 2}{t_{1/2}}

\frac{4.1604}{t}=\frac {ln\ 2}{t_{1/2}}

t = 6\times t_{1/2}

<u>6 half-lives are required for the concentration of reactant to decrease to 1.56% of its original value.</u>

6 0
4 years ago
What is the combustibility of calcium?
Alexeev081 [22]

the combustibility of calcium is relitivly high



3 0
4 years ago
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The transfer of heat by the movement of heated fluid is called conduction. Please select the best answer from the choices provid
ella [17]
I would suppose it is false because conduction is the movement of heat between two objects that are in contact.
8 0
3 years ago
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What molality of a nonvolatile, nonelectrolyte solute is needed to raise the boiling point of water by 7.10°c (kb = 0.520°c/m)?
faltersainse [42]
According to boiling point elevation equation:
Δ T = i Kb m
when ΔT (change in boiling point) = 7.10 C° 
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and Kb = 0.520
so, by substitution:
7.10 = 1*0.520 *m
m = 7.1 / 0.52 = 13.65 m
7 0
4 years ago
A student weighs out a 7.24 g sample of , transfers it to a 300. mL volumetric flask, adds enough water to dissolve it and then
velikii [3]

The molarity of the zinc chloride solution will be 0.089 M

<h3>Molarity</h3>

Mole of 7.24 g ZnCl2 = 7.24/136.286 = 0.5312 mol

Total volume of water used in preparing the solution = 300 + 300 = 600 mL

Molarity of the solution = mole/volume = 0.5312/0.6 = 0.089 M

The molarity of the zinc chloride solution is, therefore, 0.089 M

More on molarity can be found here: brainly.com/question/8732513

#SPJ1

4 0
2 years ago
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