Which of the following types of fingerprints is collected with gray or black powder and fingerprint tape?

sodium reacts with chlorine to form sodium chloride, explain how in terms of electrons, atoms and ions

OverLord2011 [107]

Sodium is in group 1 so it has 1 valence electron (one electron in its outer shell). Sodium will be looking to lose its one valence electron in order to become more stable. Chlorine is in group 17 so it has 7 valence electrons, and therefor only needs to gain one valence electron to attain noble gas electron configuration (become stable with 8 valence electrons, just like the noble gases in group 18 have 8). Because the chlorine atom is trying to gain one electron, and the sodium atom is trying to lose one, sodium will give up its one valence electron to chlorine and the two atoms will form an ionic bond. Because chlorine is looking to gain just one electron and sodium is looking to lose the same number, the ratio of chlorine atoms to sodium atoms will be 1:1, one chlorine atom per one sodium atom.

7 0

3 years ago

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When a lamp is turned on, only about 10% of the energy is transformed into light. What happens to the rest of the energy?

joja [24]

The rest of the energy that is not transformed into light becomes thermal energy

8 0

4 years ago

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Determine the ph of a 0. 35 m aqueous solution of CH3NH2 (methylamine). The kb of methylamine is?

guajiro [1.7K]

The pH of 0.35 M of CH₃NH₂ is 12.09 and the $k_b$ for methylamine is 4.4 x 10⁻⁴.

pHis the quantitative measure of acidity and basicity of an aqueous or other liquid solution. The scale range goes from 0 to 14. Water has a pH of 7 and is neutral in nature.

<h3>What is dissociation constant?</h3>

The dissociation constant is an equilibrium constant that describes the dissociation or ionization of a base or an acid

$k_a$ describes the dissociation of an acid

$k_b$ describes the dissociation of a base

For methylamine,

$CH_3NH_2 + H_2O\Leftrightarrow CH_3NH_3^+ + OH^-$

Initial concentration of methylamine = 0.35 M

Initial concentration of products = 0

Let, at equilibrium concentration of CH₃NH₂ = 0.35 - x

Then, concentration of CH₃NH₃⁺ and OH⁻ is x and x respectively

$k_b = \frac{[CH_3NH_3^+] [OH^-]}{[CH_3NH_2]}$

The dissociation constant for methylamine, $k_b$ = 4.4 x 10⁻⁴

$4.4 \times 10^-^4 = \frac{x.x}{0.35} \\x^{2} = 4.4 \times 10^-^4 \times 0.35\\x^{2} = 1.54 \times 10^-^4 \\$

$x =0.0124$

pOH = -log[OH] = -log(0.0124) = 1.91

pH + pOH = 14

pH = 14 - 1.91 = 12.09

Thus, the pH of methylamine is 12.09 and $k_b$ is 4.4 x 10⁻⁴

Learn more about pH:

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7 0

2 years ago

What type of molecule is 2-methylpentene?

mylen [45]

Answer is: branched alkene.

Carbon atoms can be arranged s<span>traight chain, branched chain and ring.
Hydrocarbon is an organic compound consisting of hydrogen and carbon.
In straight chain carbon atoms are bonded with only two other carbon atoms in elongate chain.
In branched chain at least one carbon is bonded with more than two other carbon atoms. In this example </span><span>2-methylpentene</span><span> second carbon atom is bonded with three carbon atoms.
Ring chain hydrocarbons are cyclic hydrocarbons.</span>

3 0

3 years ago

Select the correct answer.

Gwar [14]

Answer:

C) is correct answer . <em /><em />

3 0

4 years ago

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