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
Stells [14]
3 years ago
8

Please answer all :)

Biology
1 answer:
Serggg [28]3 years ago
7 0

Answer:

i) Rusting occurs the least in tubes 2 and 3 because either of air and water which are necessary for rusting is absent in the two tubes respectively.

ii) Rusting occurs most in tube 1 because both air and water which are necessary for rusting are present.

Explanation:

Rusting is a chemical change which involves a redox reaction. During the process of rusting, metallic iron is oxidized to hydrated iron (iii) oxide by oxygen present in air.

For rusting to take place effectively, each of these three factors mist be available: metallic iron, oxygen and water.

In the figure above, the iron nails in the three tester tubes will rust to different extents based on the availability of the three factors.

In test tube 1, the iron nails will rust the most because all the three factors: metallic iron, oxygen present in air, and water are abundantly present.

In test tube 2, the iron nails will rust the least or not at all because boiling of water removes dissolved oxygen from water and the oil layer above the boiled water prevents entry of oxygen from air. Thus, the nail do not rust because one of the three factors for rusting to take place, in this instance, oxygen is absent.

In test tube 3, the iron nails rusts the least or not at all as well because moisture or water is absent. Calcium chloride, a drying agent removes all the moisture from inside the tube. Hence, even though air is present, rusting do not occur as there is no moisture or water present.

You might be interested in
What separates the thoracic cavity from the abdominal cavity?
aalyn [17]
Diaphragm separates the abdominal cavity from thoracic cavity... :)
i think this is right answer.... 
7 0
3 years ago
Which statement is true?
marysya [2.9K]

Answer:

A) diploid cells contain two sets of chromosomes

4 0
2 years ago
Read 2 more answers
what do the similarities between the skeletal structures of these three species most likely indicate about their evolutionary hi
xxTIMURxx [149]

These three species are distantly related and share a common ancestor

3 0
3 years ago
A respiratory rate of less than ________ and greater than ________ in cases of trauma are criteria for immediate transportation
vovikov84 [41]

The question is incomplete as it does not have the options which are:

A. 8; 32

B. 10; 29

C. 12; 20

D. 5; 45

Answer:

The correct answer will be option-B

Explanation:

Trauma is the experience caused by the life-threatening events or events which help develop the psychological distress conditions.

The trauma can cause changes in the physiologic and psychological responses in humans. The CDC guidelines have stated criterion for immediate transportation of the person to the trauma centre in which one of the criteria is that if a person has the respiratory rate of less than 10 and greater than 29 will be transported to the trauma centre immediately.

Thus, Option-B is the correct answer.

8 0
3 years ago
_ are the group of organisms always found at the base of a food chain. explain why
Alecsey [184]

Answer:

Plants Plants are autotrophs, which means they produce their own food. They use the process of photosynthesis to transform water, sunlight, and carbon dioxide into oxygen, and simple sugars that the plant uses as fuel. These primary producers form the base of an ecosystem and fuel the next trophic levels.

Explanation:

If you like my answer than please mark me brainliest thanks

5 0
2 years ago
Other questions:
  • How can animals have difficulty getting energy
    7·1 answer
  • What is the bacterial cell called when it lacks an f plasmid?
    13·1 answer
  • How does heat flow inside Earth move the tectonic plates?
    15·1 answer
  • Evolution is change in a population over time and includes the gene pools of that population. How does biogeographic isolation a
    10·1 answer
  • One effect of washing regularly with antibacterial agents is the removal of normal microbiota. this can result in
    9·1 answer
  • 3 questions, I really need help.
    5·1 answer
  • Do we live in the troposphere?
    9·2 answers
  • Which is one major product of the ETS series of reactions
    13·1 answer
  • What makes the Earth center act like a magnet
    12·1 answer
  • During DNA replication, what occurs?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!