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KIM [24]
3 years ago
5

Determine which set of properties correctly describes graphite (C)? A. Malleable, brittle, soluble in oil or gasoline, high melt

ing point, simple structure B. Malleable, brittle, soluble in oil or gasoline, high melting point, simple structure C. Ionic lattice, giant structure, soluble in oil or gasoline, low melting point, does not conduct electricity D. Dense, conducts electricity, high melting point, giant structure, brittle
Chemistry
1 answer:
satela [25.4K]3 years ago
6 0

Answer:

D. Dense, conducts electricity, high melting point, giant structure, brittle

Explanation:

Graphite is an allotrope of carbon. It is similar to diamond except for some differences in their properties and mode of formation.

Graphite is typically a non-metal and should have properties of non-metals. Metals are malleable, ductile, conducts electricity, etc.

Graphite is able to conduct electricity because of the presence of free mobile electrons in its structure.

It is dense but its density is lower than that of diamond but higher than water.

Graphite is brittle with a high melting point which is close to that of diamond.

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Write the symbolic notation of an isotope of an element having 8 protons, 8 electrons, and 11 neutrons. Click on the “Templates”
horrorfan [7]
Attached to this answer is the format of Isotope Notation that you can use for future reference. <em>(Please open)</em>

There are 8 Protons. The Atomic Number is the same number of an element's proton.

If you can see in the format, the mass number is calculated by adding the atomic number/protons and neutrons.

Mass number = 8 + 11
Mass number = 19

The image of the final answer is attached as well.

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T/F according to the law of conservation of energy, when you use energy
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A 25.0-mL sample of 0.150 M hydrazoic acid, HN3, is titrated with a 0.150 M NaOH solution. What is the pH after 13.3 mL of base
tamaranim1 [39]

Answer:

pH ≅ 4.80

Explanation:

Given that:

the volume of HN₃ = 25 mL = 0.025 L

Molarity of HN₃ = 0.150 M

number of moles of HN₃ = 0.025 × 0.150

number of moles of HN₃ =  0.00375  mol

Molarity of NaOH = 0.150 M

the volume of NaOH = 13.3 mL = 0.0133

number of moles of NaOH = 0.0133× 0.150

number of moles of NaOH = 0.001995 mol

The chemical equation for the reaction of this process can be written as:

HN_3 + OH- ---> N^-_{3} + H_2O

1 mole of hydrazoic acid react with 1 mole of hydroxide to give nitride ion and water

thus the new number of moles of HN₃ = 0.00375 - 0.001995 = 0.001755 mol

Total volume used in the reaction =  0.025 +  0.0133 = 0.0383  L

Concentration of HN_3 = \dfrac{0.001755}{0.0383} = 0.0458 M

Concentration of N^{-}_3 = \dfrac{ 0.001995 }{0.0383} = 0.0521 M

GIven that :

Ka = 1.9 x 10^{-5}

Thus; it's pKa = 4.72

pH =4.72 +  log(\dfrac{ \ 0.0521}{0.0458})

pH =4.72 + log(1.1376)

pH =4.72 + 0.05598

pH =4.77598

pH ≅ 4.80

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Zigmanuir [339]
the answer is protons
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Answer:

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Explanation:

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