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marysya [2.9K]
2 years ago
12

Multiple Choice Questions 1. Which of the following statement best describes an atom? A. Protons and electrons are grouped toget

her in a random pattern. B. Protons and electrons are grouped together in an alternating pattern C. A core of protons and neutrons surrounded by electrons. D. A core of electrons and neutrons surrounded by protons. 2. Table 5.10 shows the atomic mass of four stable isotopes of an element X. 119​

Chemistry
2 answers:
OverLord2011 [107]2 years ago
6 0
The answer is C. Here check out this diagram of an atom.

Arturiano [62]2 years ago
5 0

Answer:

C is Correct

Explanation:

Protons and Neutrons make up the Nucleus while Electrons surround the nucleus in circular orbits with continuous rotation.

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n the laboratory, a general chemistry student measured the pH of a 0.342 M aqueous solution of ethylamine, C2H5NH2 to be 12.067.
Tasya [4]

Answer:

The value of K_b of the an ethylamine is 4.121\times 10^{-4}.

Explanation:

The pH of the solution = 12.067

The pOH of the solution = 14 - pH =14-12.607 =1.933

pOH=-\log[OH^-]

1.933=-\log[OH^-]

[OH^-]=0.0117 M

C_2H_5NH_2+H_2O\rightleftharpoons C_2H_5NH_3^{+}+OH^-

Initially

0.342 M                              0     0

At equilibrium

(0.342-x)                             x      x

The value of x = [OH^-]=0.0117 M

The expression of K_bis given as:

K_b=\frac{[C_2H_5NH_3^{+}][OH^-]}{[C_2H_5NH_2]}

K_b=\frac{x^2}{(0.342-x)}

K_b=\frac{(0.0117 )^2}{(0.342-0.0117)}=4.121\times 10^{-4}

The value of K_b of the an ethylamine is 4.121\times 10^{-4}.

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3 years ago
Which would most likely be joined by an ionic bond?
KATRIN_1 [288]
An ionic bond is composed of a cation and anion, which are charged ions. You cannot have atoms with ionic bonds, because there is no opposite attraction between charges due to atoms having a net nuclear charge of zero. Therefore, a cation and anion would most likely be joined by an ionic bond.
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How many milliseconds (ms) are there in 3.5 seconds (s)?
ivolga24 [154]

Answer:

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Explanation:

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Answer:

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Explanation:

depended on the temperature

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* Hopefully this answers your question :) Mark me the brainliest:)

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