Yeah, i need : ( a student is deciding which chemicals are acids by measuring their ph. he sees that a solution of co2 has an acidic ph. he decides that he must have contaminated his sample. he thinks that co2 could not create hydrogen ions in the solution since it contains no hydrogen atoms. explain what is incorrect about the student’s reasoning.

The student is worng, because CO₂ is acidic oxide. When an acidic oxide reacts with water, acid is formed. In the student's case, the following reaction happens:

H₂O + CO₂ ⇒ H₂CO₃

The H₂CO₃ is carbonic acid and it is the scoure of the H⁺ atoms. The sample is not contaminated.

water   molecules stay close to each other through cohesion, the collective action of hydrogen bonds between water molecules. cohesion plants draw water upwards from the root through the stem's transport tubes (xylem) to the leaf. this transport occurs even in large trees and against gravity. transpiration, evaporation of water from plant leaves, creates a tension on water molecules being pulled up from the stem and roots.

water also has high (the attraction of one substance to another) properties because of its polar nature. adhesion of water molecules to plant cell walls counteract gravity while water is transported from roots to leaves.

water exhibits a very high surface tension when compared to other liquids. surface tension is a property of a liquid that holds the surface together and allows it to resist an external force. by capillary action, the water forms concave menisci inside the pores. the high surface tension of water pulls the concavity outwards, generating enough force to lift water from the roots to the leaves of plants.

thus, cohesion, along with adhesion and surface tension creates a capillary action that keeps water molecules interacting and moving through the plants out to the leaf cells.

therefore, option d) is the correct answer.

explanation:

i think it's c. i'm not sure but i think so.