Question

question 12
1 pts
consider the following reaction:
2 h₂ + o₂ -> 2h₂o
in this reaction, 2 h₂ + o₂ are the select and 2h₂o is the select

question 13
1 pts
water is a select molecule.

question 14
1 pts
which of the following are biologically important qualities of water? (select all that apply.)

• its solid form is less dense than its liquid form
• cohesion
• adhesion
• high surface tension
• high specific heat

Explanation:

Question 12

In a chemical reaction, the substances that react (on the left side of the arrow) are reactants, and the substances formed (on the right side) are products. For the reaction \(2H_2 + O_2
ightarrow 2H_2O\), \(2H_2 + O_2\) are the reactants, and \(2H_2O\) is the product.

Water (\(H_2O\)) is a polar molecule. The oxygen atom is more electronegative than hydrogen, creating a partial negative charge on oxygen and partial positive charges on hydrogens, leading to a polar covalent bond and a polar molecular structure.

• "its solid form is less dense than its liquid form": Ice floats on water, which is important for aquatic life (insulates water bodies).
• "cohesion": Water molecules stick to each other, important for water transport in plants.
• "adhesion": Water molecules stick to other surfaces, also aids in plant water transport.
• "high surface tension": Due to cohesion, allows small organisms to move on water surface.
• "high specific heat": Helps regulate temperature in organisms and environments. All these are biologically important qualities of water.

Answer:

First [Select]: reactants; Second [Select]: product

Question 13