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
AnnyKZ [126]
4 years ago
9

Stalactites and stalagmites in most caves are made of limestone (calcium carbonate). The presence of calcium sulfate is explaine

d by the following sequence of reactions. a) H2S (aq) + 2 O2 (g) → H2SO4(aq) b) H2SO4 (aq) + CaCO3(s) → CaSO4 (s) + H2O (L) +CO2 (g) Which (if either) of these reactions is a reduction oxidation reaction? Identify the substance oxidized and substance reduced, and the oxidizing agent and the reducing agent.
Chemistry
1 answer:
Mama L [17]4 years ago
8 0

Explanation:

a) H2S (aq) + 2 O2 (g) → H2SO4(aq)

b) H2SO4 (aq) + CaCO3(s) → CaSO4 (s) + H2O (L) +CO2 (g)

To identify a redox reaction, we have to monitor the oxidation number of the elements to see if there is change.

In reaction (a);

The oxidation number of S increases from -2 (H2S) to + 6 (H2SO4). Also the oxidation number of O decreases from 0 (O2) to -2 (H2SO4). This is a redox reaction.

The oxidizing agent is O2 because it was reduced and the reducing agest is H2S.

In reaction (b);

There is no change in oxidation number in any f the elements. This is not a redox reaction.

You might be interested in
Which example best demonstrates Charles’s law?
Liono4ka [1.6K]

Answer:

A

Explanation:

The Charles law states that the volume of an ideal gas increases when temperature is increased under constant pressure. The pressure inside the balloon is always equal to the atmospheric pressure. Therefore answer A demonstrate the Charles law.

6 0
4 years ago
Read 2 more answers
How can you tell which ionic compounds will react in an aqueous solution
Darina [25.2K]
1.  Determine if the ionic substances can break apart into ions.
 - e.g. CaCO3 isn't very soluble, do it can't dissolve and dissociate.  If it can't pop apart, no ions.
2.  Swap the partners for all the other ions that you can get from step 1.  You can skip pairings with the same charge - a + can't get close to another + to react.
3.  Use solubility, acid/base, and redox rules to see if anything will happen with the ions in solution.<span />
3 0
3 years ago
What is the maximum amount of kcl that can dissolve in 200 g of water? (the solubility of kcl is 34 g/100 g h2o at 20°c.) (1 poi
Solnce55 [7]
The answer is 68g
hope this helps!!
5 0
4 years ago
What are the disadvantages of driverless cars ? Check all that apply
vladimir1956 [14]
Computers don’t have the ability to see as much as we do and in Construction sites this can be very dangerous if your driverless car has not been properly updated in an area where there’s a lot of construction you can we put into harms way. The lanes may have changed and they will not have the data to be able to recognize this in time and you could get into a serious car crash.
3 0
3 years ago
One city is located north of the equator and experiences average rainfall and warm temperatures. Another city is located exactly
antoniya [11.8K]
B I think ..........................
3 0
4 years ago
Other questions:
  • Atoms of which element can bond to each other to form chains, rings, and networks?
    13·1 answer
  • A solution of potassium cyanide, KCN, is made by dissolving 3.2 g of KCN in water. When this solution reacts with excess hydroch
    13·2 answers
  • How is the mass number calculated for an element
    5·2 answers
  • Please help!!!!
    7·1 answer
  • Draw the following isomers of the alkanes of molecular formula C-H16
    14·1 answer
  • Thermal energy is __________.
    7·2 answers
  • Over time, pollution generally leads to which of the following?
    10·1 answer
  • Match each element to the number of electrons in its valence shell
    10·1 answer
  • How many protons, neutrons, and electrons are in Ca-44?
    14·1 answer
  • What is the mass ethyl alcohol that fill 200.0 ml
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!