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Nana76 [90]
4 years ago
14

Which of the following elements would be predicted to be the best conductor of electricity? sodium (Na) germanium (Ge) sulfur (S

) neon (Ne)
Chemistry
2 answers:
lubasha [3.4K]4 years ago
4 0
Na because its a metal. Metals are the best conductors. S and Ne are nonmetals. and Ge is a metalloid. (Metalloids are semi conductors)
pentagon [3]4 years ago
4 0

The correct option is SODIUM, Na.

Out of all the options given above, it is only sodium that is a metal, the other ones are non metals and metalloid. Generally, metals are good conductor of heat and electricity because they have electrons, which are able to move about and thus they are thus able to conduct electricity round a circuit. Metals are generally bonded together by strong metallic bonds so they have high melting and boiling points, which make them suitable as conductors.

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What is the pH of a solution with an [H+] = 4.73x10^-7 M
Mice21 [21]

Answer:

The answer to your question is pH = 6.3

Explanation:

Data

pH = ?

[H⁺] = 4.73 x 10⁻⁷ M

pH is the measure of the concentration of [H⁺]. pH measures the acidity of the solution. If the value of pH is between 0 and 6.9, the solution is an acid. If the pH is 7.0 the solution is neutral and if the pH is between 7.1 and 14, the solution is an alkali.

Formula

pH = -log[H⁺]

Substitution

pH = -log[4.73 x 10⁻⁷]

-Simplification

pH = - (-6.3)

-Result

pH = 6.3

6 0
3 years ago
Calculate the concentrations of all species present in a 0.26 M solution of ethylammonium chloride (C2H5NH3Cl).
Alina [70]

Answer:

0.00000223

Explanation:

pKa for C2H5NH3+ = 10.7

pKw = 14.0

pKa + pKb = pKw

10.7 + pKb = 14.0

pKb = 14.0 - 10.7

pKb = 3.30

C2H5NH3Cl is a salt of ethylamine and HCl so it will dissolve in water to produce  C2H5NH3^+ + Cl^-

The base hydrolysis reaction:  C2H5NH3^+(aq) + H2O(l) <=> C2H5NH2(aq) + H3O^+(aq)

This reaction is described by Kb.

Kb = [C2H5NH2][H3O^+]/[C2H5NH3^+]

Let [C2H5NH2] = [H3O^+] = x,

so [C2H5NH3^+] = 0.26 - x

Kb = x^2/(0.26 - x) = 2.00 x 10^-11  

Let's solve for x. In this equation,  It is possible to solve without the use quadratic equation. So we can assume that 0.26 - x  is approximately equal to 0.26.  We won't know until we do the calculation.

We get:  x^2 + 2.00 x 10^-11x - 4.99 x 10^-12 = 0

With the use of a quadratic calculator.

x = 2.23 x 10^-6 M = [C2H5NH2] = [H3O^+]

0.26 - x  is just 0.26 M in this problem because 2.23 x 10^-6 M is insignificant.

[C2H5NH3^+] = 0.26 M = [Cl^-]

NOTE:

pH = -log [H3O^+] = -log(2.23 x 10^-6) = 5.65

Ka is the acid dissociation constant

Kb is the base dissociation constant

5 0
3 years ago
I SUCK AT SCIENCE SO HERE
densk [106]
When I was on the phone with my bio teacher I asked she said endothermic
3 0
3 years ago
Read 2 more answers
Which step in the scientific method requires you to use your senses to obtain information?
a_sh-v [17]

Answer:

The answer is Observation.

For you to observe the things around you then you need to use all your sense organs....

7 0
3 years ago
A balloon under 14.7 atm of pressure at 273K gets left in a car in Florida and the temperature increases to 303K. What is the ne
Firdavs [7]

Answer:

The new pressure in the balloon is 16.3 atm

Explanation:

Gay-Lussac's law establishes the relationship between the temperature and the pressure of a gas when the volume is constant.

This law establishes that pressure and temperature are directly proportional quantities, that is to say that if the temperature increases the pressure increases and if the temperature decreases the pressure decreases.

Mathematically, Gay-Lussac's law states that, when a gas undergoes a constant volume transformation, the quotient of the pressure exerted by the gas temperature remains constant:

\frac{P}{T}=k

When you want to study two different states, an initial one and a final one, of a gas, you can use the expression:

\frac{P1}{T1}=\frac{P2}{T2}

In this case:

  • P1= 14.7 atm
  • T1= 273 K
  • P2= ?
  • T2= 303 K

Replacing:

\frac{14.7 atm}{273 K}=\frac{P2}{303 K}

Solving:

P2=303K*\frac{14.7 atm}{273 K}

P2= 16.3 atm

<u><em>The new pressure in the balloon is 16.3 atm</em></u>

4 0
3 years ago
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