Click on the graphic to choose the correct relationship on the graph.R = diffusion rate of gas
MW = molecular weight

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Answer 1

Answer:

The graph of the relationship between the rate of diffusion and molar weight is shown by option A

What is the relationship between rate of diffusion and molar weight?

Graham's law of diffusion states that the rate of diffusion is inversely related to the square root of the molar mass of a gas.

According to this relationship, under the same circumstances, lighter molecules disperse more quickly than heavier ones. It is crucial to comprehend how gases behave and how their molecular makeup affects how they travel and are distributed.

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Answer 2

Answer:

Answer:

its the first graph

Explanation:

i got the answer correct using odyssey-ware

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Based on the sign of E cell, classify these reactions as spontaneous or non spontaneous as written.? assume standard conditions. Ni^2+ (aq) + S^2- (aq) ----> + Ni (s) S (s) (nonspontaneous)? Pb^2+ (aq) +H2 (g) ----> Pb (s) +2H^+ (aq) (nonspontaneous)? 2Ag^+ (aq) + Cr(s) ---> 2 Ag (s) +Cr^2+ (aq) (spontaneous?) Are these correct?

Answers

A electrochemical reaction is said to be spontaneous, if $E^(0) cell is positive.$

Answer 1:
Consider reaction: Ni^2+ (aq) + S^2- (aq) ----> + Ni (s) + S (s)

The cell representation of above reaction is given by;
   $S^(2-)/S // Ni^(2+)/Ni$

Hence, $E^(0)cell = E^(0) Ni^(2+/Ni) - E^(0) S/S^(2-)$
we know that, ${E^(0) Ni^(2+)/Ni = -0.25 v$
and ${E^(0) S/ S^(2-) = -0.47 v$

Therefore, $E^(0) cell$ = - 0.25 - (-0.47) = 0.22 v

Since, $E^(0) cell$ is positive, hence cell reaction is spontaneous
.....................................................................................................................

Answer 2:
Consider reaction: Pb^2+ (aq) +H2 (g) ----> Pb (s) +2H^+ (aq)

The cell representation of above reaction is given by;
   $H_(2) / H^(+) // Pb^(2+) /Pb$

Hence, $E^(0)cell = E^(0) Pb/Pb^(2+) - E^(0) H_(2)/H^(+)$
we know that, ${E^(0) Pb^(2+)/Pb = -0.126 v$
and ${E^(0) H_(2)/ H^(+) = -0 v$

Therefore, $E^(0) cell$ = - 0.126 - 0 = -0.126 v

Since,   $E^(0) cell$ is negative, hence cell reaction is non-spontaneous.

....................................................................................................................

Answer 3:
Consider reaction: 2Ag^+ (aq) + Cr(s) ---> 2 Ag (s) +Cr^2+ (aq)

The cell representation of above reaction is given by;
   $Cr/Cr^(2+) // Ag^(+)/Ag$

Hence, $E^(0)cell = E^(0) Ag^(+)/Ag - E^(0) Cr/Cr^(2+)$
we know that, ${E^(0) Ag^(+)/Ag = -0.22 v$
and ${E^(0) Cr/ Cr^(2+) = -0.913 v$

Therefore, $E^(0) cell$ = - 0.22 - (-0.913) = 0.693 v

Since,   $E^(0) cell$ is positive, hence cell reaction is spontaneous

Answer: $Ni^(2+)(aq)+S^(2-)(aq)\rightarrow Ni(s)+S(s)$ : non spontaneous

$Pb^(2+)(aq)+H_2(g)\rightarrow Pb(s)+2H^+(aq)$ : non spontaneous

$2Ag^(+)(aq)+Cr(s)\rightarrow 2Ag(s)+Cr^(2+)(aq)$ : spontaneous

Explanation:

a) $Ni^(2+)(aq)+S^(2-)(aq)\rightarrow Ni(s)+S(s)$

Here S undergoes oxidation by loss of electrons, thus act as anode. Ni undergoes reduction by gain of electrons and thus act as cathode.

$E^0=E^0_(cathode)- E^0_(anode)$

Where both $E^0$ are standard reduction potentials.

$E^0_([Ni^(2+)/Ni])=-0.25V$

$E^0_([S^(2-)/S])=0.407VV$

$E^0=E^0_([Ni^(2+)/Ni])- E^0_([S^(2-)/S])$

$E^0=-0.25-(0.407V)-0.657V$

As value of $E^0$ is negative, the reaction is non spontaneous.

b) $Pb^(2+)(aq)+H_2(g)\rightarrow Pb(s)+2H^+(aq)$

Here Hydrogen undergoes oxidation by loss of electrons, thus act as anode. Pb undergoes reduction by gain of electrons and thus act as cathode.

$E^0=E^0_(cathode)- E^0_(anode)$

Where both $E^0$ are standard reduction potentials.

$E^0_([Pb^(2+)/Pb])=-0.13$

$E^0_([H^(+)/H_2])=0V$

$E^0=E^0_([Pb^(2+)/Pb])- E^0_([H^(+)/H_2])$

$E^0=-0.13-(0V)=-0.13V$

As value of $E^0$ is negative, the reaction is non spontaneous.

c) $2Ag^(+)(aq)+Cr(s)\rightarrow 2Ag(s)+Cr^(2+)(aq)$

Here Cr undergoes oxidation by loss of electrons, thus act as anode. Ag undergoes reduction by gain of electrons and thus act as cathode.

$E^0=E^0_(cathode)- E^0_(anode)$

Where both $E^0$ are standard reduction potentials.

$E^0_([Ag^(+)/Ag])=+0.80V$

$E^0_([Cr^(2+)/Cr])=-0.913V$

$E^0=E^0_([Ag^(+)/Ag])- E^0_([Cr^(2+)/Cr])$

$E^0=+0.80-(-0.913V)=1.713V$

As value of $E^0$ is positive, the reaction is spontaneous.

Why is glass a good substance for storing chemicals?A. Glass is a noble solid.
B. Glass has low reactivity.
C. Glass is cheap and readily available.
D. The melting point of glass is very high.

Answers

B, I just took the test and the correct answer is b. Cheap doesn't always equal quality.

How do ionic bonds affect the properties of ionic compounds?A) The bonds weakly hold ions together, increasing the melting point.
B) The bonds strongly hold ions together, reducing the boiling point.
C) The bonds prevent ions from moving throughout the crystal, so a solid ionic compound is a poor conductor.
D) The bonds prevent electrons from moving throughout the crystal, so a solid ionic compound is a poor conductor.

Answers

C) The bonds prevent ions from moving throughout the crystal, so a solid ionic compound is a poor conductor is your answer, however, technically speaking the bonds prevent electrons from moving, since the ions are locked in place and don't want their electrons to go.

Final answer:

Ionic bonds in ionic compounds result in a crystal lattice structure that prevents free movement of ions, making solid ionic compounds poor conductors of electricity. However, dissolved or melted ionic compounds can conduct electricity. Additionally, these strong bonds lead to high melting and boiling points for ionic compounds.

Explanation:

Ionic bonds greatly affect the properties of ionic compounds. Ionic bonds are formed when one atom donates an electron to another, resulting in charged ions that attract each other. Option C) and D) are both partly correct. Ionic bonds lock these ions in a crystal lattice structure which prevents free movement. This makes solid ionic compounds poor conductors of electricity. However, if these compounds are dissolved in water or melted (thus allowing ions to move freely), they can conduct electricity.

Moreover, ionic bonds are strong. As a result, it requires a lot of energy to break these bonds, leading to high melting and boiling points for ionic compounds, which eliminates options A) and B).

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The _______ elements tend to lose electrons and form positive ions, while the _______ elements tend to gain electrons and form negative ions. A. Nonmetal, metal B. Metal, noble gas C. Metal, nonmetal D. Noble gas, nonmetal

Answers

Answer:

Explanation:

Metals tends to lose electrons and form positive ions, known as cations. Whereas, non-metals tend to gain electrons and form negative ions known as anions.

Answer:

C. Metal, nonmetal

Explanation:

Fill in the blanks

The metal elements tend to lose electrons and form positive ions, while the non-metal elements tend to gain electrons and form negative ions.

The reaction, 4Fe (s) + 3O2 (g) à 2 Fe2O3 (s), is the rusting of iron. What occurs as the reaction proceeds? a precipitate is formed the color of the solid will change a new odor is given off the solution bubbles

Answers

Answer: the color of the solid will change

Explanation:

A chemical reaction is defined as the reaction in which a change in chemical composition takes place. A new substance is formed in these reactions.

Example: Oxidation of iron to ferric oxide is a chemical change.

$4Fe(s)+3O_2(g)\rightarrow Fe_2O_3(s)$

Here iron which is grey in color changes first to green and then turns brownish red.

Characteristics of a chemical reaction:

1. change in color

2. heat is gained or lost

3. evolution of gas

4. formation of precipitate

The reaction, 4Fe (s) + 3O2 (g) -> 2 Fe2O3 (s), is the rusting of iron. As the reaction proceeds, the color of the solid will change due to the reacction of iron with air. The rest of the choices do not answer the question above.

What do you think will happen to the ecosystem if all the coral reefs are destroyed?

Answers

Animals that rely on coral for protection and cover, such as grouper, snapper, oysters and clams, would also be negatively impacted. And because this marine life is a vital staple in many peoples' diets, the death of the coral reefs would exacerbate the problem of feeding these groups [source: Skoloff].

Click on the graphic to choose the correct relationship on the graph.R = diffusion rate of gasMW = molecular weight

Answers

What is the relationship between rate of diffusion and molar weight?

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Final answer:

Explanation:

Learn more about Ionic bonds here:

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Fill in the blanks

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Click on the graphic to choose the correct relationship on the graph.R = diffusion rate of gas
MW = molecular weight