CHEMISTRY HIGH SCHOOL

Which of the following pairs of elements is most likely to form an ionic bond?A.
carbon and chlorine
B.
phosphorous and bromine
C.
sulfur and oxygen
D.
sodium and sulfur

Answers

Answer 1

Answer:

Answer is: D. sodium and sulfur.

When the electronegativity difference is greater, the bond polarity is increasing..

Electronegativity (χ) is a property that describes the tendency of an atom to attract a shared pair of electrons.

Atoms with higher electronegativity attracts more electrons towards it, electrons are closer to that atom.

Δχ(Na-S) = 2.6 - 0.95 = 1.655; electronegativity difference between sodium and sulfur.

Ionic bond is the electrostatic attraction between oppositely charged ions (cations and anions).

Sodium is metal (forms cation) and sulfur is nonmetal (forms anion).

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A .35 m solution of weak acid, HX, has a h+ of 4.15×10^-3. what is the value of ka for this acid

Answers

Ka has the formula:

Ka = [H+] [X-] / [HX]

We have the following given:
[H+] = 4.15x10^-3
[HX] = 0.35

Since the acid dissociates in a ratio of 1 [H+] to 1 X,
[H+] = [X-]

Plugging in the values,
Ka = (4.15x10^-3)(4.15x10-3) / 0.35
Ka = 4.92x10^-5

Write an equation that shows the formation of a selenide ion from a neutral selenium atom

Answers

Answer:

Se + 2e- => Se-2

Explanation:

Ions are electrically charged particles, formed due to the gain or loss of electrons by an atom.

There are two types of ions cations and anions. An element that loses their electrons and forms positive ions are cations while metals and element that gains one or more electrons and forms negative ions are anions.

Selenium is an atom with atomic number 34 and represented as Se. The electronic configuration of Se is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4. Selenium will gain 2 more electrons to complete it p orbital and form an ion Se-2.

The equation is as below:

Se + 2e- => Se-2

How does temperature impact the mixture of ethanol and water?????????????

Answers

The temperature impact the mixture ethanol and water because of the ions that exist between them. As temperature increases, the kinetic energy of the molecules is high because there is room for movement.

Given the balanced ionic equation:Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s)
Which equation represents the oxidation half reaction?
(1) Zn(s) + 2e– → Zn2+(aq)
(2) Zn(s) → Zn2+(aq) + 2e–
(3) Cu2+(aq) → Cu(s) + 2e–
(4) Cu2+(aq) + 2e– → Cu(s)

Answers

Answer: Option (2) is the correct answer.

Explanation:

Oxidation is the process in which there is loss of electrons or increase in oxidation number of the element.

Whereas reduction is the process in which there is gain of electrons or decrease in oxidation number of the element.

For example, $Zn(s) + Cu^(2+) \rightarrow Zn^(2+) + Cu(s)$

Oxidation-half reaction: $Zn(s) \rightarrow Zn^(2+) + 2e^(-)$

Reduction-half reaction: $Cu^(2+) + 2e^(-) \rightarrow Cu(s)$

Thus, we can conclude that the given equation Zn(s) → Zn2+(aq) + 2e– represents the oxidation half reaction.

The equation that represents the oxidation half reaction is Zn(s) → Zn2+(aq) + 2e–

What is oxidation reaction?

Oxidation reaction is the process in which there is loss of electrons or increase in oxidation number of the element.

From all the given half reaction, there is only one reaction with increase in oxidation number;

Zn(s) → Zn2+(aq) + 2e–

Zn(s) - oxidation = 0
Zn2+ - oxidation number = +2

Thus, there is increase in oxidation number of 0 to + 2.

Learn more about oxidation number here: brainly.com/question/27239694

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Describe the difference between the terms “element”, “compound”, “molecule”, and “salt”.

Answers

You can define an element as a substance with only one type of atom in(e.g. only sulphur atoms). If a substance has more than one type of atomin, then it is either a compound or a mixture, depending on whether theelements have bonded. Examples of elements are:

Oxygen
Sulphur
Carbon
Hydrogen
Protactinium

Compound-
A substance made up of atoms of two or more different elements joined by chemical bounds.
Molecule- a pure substance that cannot be broken down
Salt- A Ionic Compound Formed From The Reaction Of An Acid And Base .

Can someone please take a look at this lab.? And show answers with work? Thanks! I tried it but I'm pretty sure I did it all wrong.