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4 years ago

A brown solid element conducts electricity well. Is it a metal or non-metal?

Chemistry

2 answers:

OLga [1]4 years ago

7 0

Answer:

it's a metel

Explanation:

as far as it can conduct electricity.

it's not a metal if it can't except it it's a metalloids

cupoosta [38]4 years ago

6 0

Answer:

Metal

Explanation:

Metals conduct electricity, because they have free and mobile electrons that can carry the electricity and spread it around. Nonmetals usually cannot conduct electricity, but there are a few exceptions.

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A buffer solution is composed of 7.50 mol of acid and 4.75 mol of the conjugate base. If the pKa of the acid is 4.90 , what is t

Mamont248 [21]

Answer:

The correct answer is: pH= 4.70

Explanation:

We use the <em>Henderson-Hasselbach equation</em> in order to calculate the pH of a buffer solution:

$pH= pKa + log \frac{ [conjugate base]}{[acid]}$

Given:

pKa= 4.90

[conjugate base]= 4.75 mol

[acid]= 7.50 mol

We calculate pH as follows:

pH = 4.90 + log (4.75 mol/7.50 mol) = 4.90 + (-0.20) = 4.70

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ziro4ka [17]

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4 years ago

Liquid helium boils at –268.93 °C. What is the boiling point of helium on the Kelvin temperature scale?

BARSIC [14]

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3 years ago

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Will the composition of water molecules vary depending on their source?

Alecsey [184]

Answer:

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3 years ago

A 5.0-kg box is pushed across the floor with a force of 32 N. What is the frictional force on the box if the box's acceleration

Slav-nsk [51]

$From\ 2nd\ Newton\ Law\ resultuant\ force: \\\\\ F_R=m*a=5kg*3,6\frac{m}{s^2}=18N\\\\
F=32N\\\\
F_f- friction\ force\\\\
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4 years ago

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