1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
dimulka [17.4K]
3 years ago
8

Which of these redox reactions is spontaneous as written? (a)Ag + Cu2+ → Ag+ + Cu (b)Al + H+ → Al3+ + H2 (c)H2 + Al3+ → H+ + Al

(d)Na + K+ → Na+ + K

Chemistry
2 answers:
Svetach [21]3 years ago
7 0

<u>Answer:</u> The correct answer is Option b.

<u>Explanation:</u>

The given reactions are the examples of single displacement reactions.

Single displacement reactions are defined as the reactions in which more reactive metal replaces the less reactive metal from its chemical reaction. The reactivity of metals is given by the series known as reactivity series.

The metals which lie above in the series can replace the metals which lie low in the reactivity series.

A+BX\rightarrow AX+B

For the given options:

<u>Option a:</u> Ag+Cu^{2+}\rightarrow Ag^++Cu

Silver lies low in the series than copper and hence is less reactive. Therefore, it will not replace copper. Thus, this is a non-spontaneous reaction.

<u>Option b:</u> Al+H^+\rightarrow Al^{3+}+H_2

Aluminium lies above in the series than hydrogen and hence is more reactive. Therefore, it will easily replace hydrogen. Thus, this is a spontaneous reaction.

<u>Option c:</u> H_2+Al^{3+}\rightarrow H^++Al

Hydrogen lies low in the series than aluminium and hence is less reactive. Therefore, it will not replace aluminium. Thus, this is a non-spontaneous reaction.

<u>Option d:</u> Na+K^+\rightarrow Na^++K

Sodium lies low in the series than potassium and hence is less reactive. Therefore, it will not replace potassium. Thus, this is a non-spontaneous reaction.

Hence, the correct answer is Option b.

valina [46]3 years ago
6 0
The answer is <span>Al + H+ → Al3+ + H2
Hope this helps!
#platofam</span>
You might be interested in
Which of the following would be more likely to conduct electrons? Strontium or Iodine? Defend your choice.
Alchen [17]
Strontium because it is a metal
6 0
3 years ago
What mass of CaSO3 must have been present initially to produce 14.5 L of SO2 gas at a temperature of 12.5°C and a pressure of 1.
german
When the reaction equation is:

CaSO3(s) → CaO(s) + SO2(g)

we can see that the molar ratio between CaSO3 & SO2 is 1:1 so, we need to find first the moles SO2.

to get the moles of SO2 we are going to use the ideal gas equation:

PV = nRT

when P is the pressure =  1.1 atm

and V is the volume = 14.5 L 

n is the moles' number (which we need to calculate)

R ideal gas constant = 0.0821

and T is the temperature in Kelvin = 12.5 + 273 = 285.5 K

so, by substitution:

1.1 * 14.5 L = n * 0.0821 * 285.5

∴ n = 1.1 * 14.5 / (0.0821*285.5)

       = 0.68 moles SO2

∴ moles CaSO3 = 0.68 moles

so we can easily get the mass of CaSO3:

when mass = moles * molar mass

and we know that the molar mass of CaSO3= 40 + 32 + 16 * 3 = 120 g/mol


∴ mass = 0.68 moles* 120 g/mol = 81.6 g
7 0
3 years ago
Which of the following best describes the solar radiation absorbed by and radiated from earth?
FinnZ [79.3K]

Answer:

the answer that you are looking for is d

Explanation:

4 0
3 years ago
Read 2 more answers
Pre-lab questions 1. a concentration gradient affects the direction that solutes diffuse. describe how molecules move with respe
VLD [36.1K]

Just like how heat moves from a region of higher temperature to a region of lower temperature, molecules also tend to move from a region of higher concentration to a region of lower concentration. This is called natural diffusion and is naturally happening to reach stability.

7 0
3 years ago
Which has the greater polarizing power, Li+ or Be2+ and why?
kvasek [131]

Answer:

Polarizing power refers to an atoms ability to pull an electron toward it, polarizing the atom the electron comes from. Since cations are positive, they are able to attract electrons toward themselves. Anions are negative and so do not attract more electrons.

Therefore, Be2+ has a higher polarizing power because it has a higher quantitiy of protons, hence a higher polarizing power.

4 0
3 years ago
Other questions:
  • Which bond from each set is the longest N-O or N=O
    15·2 answers
  • Glycerol boils at a higher temperature than water. What does this indicate about the attractive forces of glycerol?
    14·2 answers
  • If Donald Trump has 5 kids how many does Hillary have Answer 0 cause she got an abortion killing her flesh and blood. DONT USE A
    6·2 answers
  • Mary put a plant on a table in her room. After a few weeks, she saw that the stem of the plant was starting to bend toward the w
    9·1 answer
  • Phytoplankton are microscopic photosynthesizing organisms that typically live in the upper layers of the ocean. What trophic lev
    14·1 answer
  • Which is the fundamental law of energy?
    7·2 answers
  • Which of the following describes the characteristics of a plasma?
    14·1 answer
  • NEED HELP ASAP
    13·2 answers
  • Which of the following chemical formulas would require a prefix when named?
    8·2 answers
  • If the change in entropy of the surroundings for a process at 451 k and constant pressure is -326 j/k, what is the heat flow abs
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!