Question

1. carbohydrates are macromolecules that store genetic information in cells. 35. enzymes are commonly called fats and oils and are a major component of cell membranes. 36. glucose, sucrose, starch, and cellulose are examples of ____________. 37. ____________ are catalytic molecules that help speed up reactions. properties of water review 1. write the chemical formula for water. 2. draw a model of a water molecule. label with the element symbol, charge, and place the electrons. 3. explain what a solution is. make sure to use the terms solute and solvent. 4. how is a water molecule like a magnet? 5. which property cohesion or adhesion causes surface tension in water? explain how this takes place. 6. give an example of when you observed of surface tension. give an example in nature. 7. define cohesion in your own words. give an example. 8. define adhesion in your own words. give an example. 9. explain how water makes its way to the leaves in the tops of the tallest trees against the force of gravity. name what the climbing of water is called and the two other properties that are responsible for making this possible.

Explanation:

Step1: Answer question 34

Carbohydrates do not store genetic information. Nucleic - acids (DNA and RNA) store genetic information. So the statement in 34 is False.

Step2: Answer question 35

Enzymes are proteins that catalyze reactions. Fats and oils are lipids and a major component of cell membranes are phospholipids. So the statement in 35 is False.

Step3: Answer question 36

Glucose, sucrose, starch, and cellulose are examples of carbohydrates.

Step4: Answer question 37

Enzymes are catalytic molecules that help speed up reactions.

Step5: Answer question 1

The chemical formula for water is $H_2O$.

Step6: Answer question 2

A water molecule has two hydrogen atoms ($H$) and one oxygen atom ($O$). The oxygen is more electronegative, so it has a partial negative charge ($\delta-$) and the hydrogens have partial positive charges ($\delta+$). The electrons are shared unequally between $O$ and $H$. A simple model can be drawn with $O$ in the center and two $H$ atoms bonded to it at an angle, with the partial - charges labeled and the shared electrons shown as dots.

Step7: Answer question 3

A solution is a homogeneous mixture. The solute is the substance that is dissolved, and the solvent is the substance in which the solute is dissolved. For example, in a salt - water solution, salt is the solute and water is the solvent.

Step8: Answer question 4

A water molecule is like a magnet because it is a polar molecule. The oxygen end has a partial negative charge and the hydrogen ends have partial positive charges. Opposite charges attract, similar to the poles of a magnet. So water molecules can attract each other and other polar substances.

Step9: Answer question 5

Cohesion causes surface tension in water. Cohesion is the attraction between like - molecules. In water, hydrogen bonds form between water molecules. At the surface, there are fewer water molecules to bond with, so the surface water molecules are pulled more strongly together, creating surface tension.

Step10: Answer question 6

An example of surface tension observed in daily life is a water strider walking on water. In nature, water droplets forming on leaves is also an example of surface tension.

Step11: Answer question 7

Cohesion is the attraction between molecules of the same substance. An example is water molecules sticking together to form a water droplet.

Step12: Answer question 8

Adhesion is the attraction between molecules of different substances. An example is water sticking to the side of a glass.

Step13: Answer question 9

Water makes its way to the leaves in the tops of the tallest trees against the force of gravity through a process called transpiration - pull. The climbing of water is called capillary action. Cohesion (water molecules sticking together) and adhesion (water molecules sticking to the walls of xylem vessels) along with transpiration (evaporation of water from leaves) are responsible for this.

Answer:

1. False
2. False
3. Carbohydrates
4. Enzymes
5. $H_2O$
6. A water molecule has $O$ in the center with two $H$ atoms bonded at an angle, $O$ has a $\delta -$ charge and $H$ has $\delta+$ charges, electrons are shared unequally.
7. A solution is a homogeneous mixture where the solute is the dissolved substance and the solvent is the substance in which the solute is dissolved.
8. Water is a polar molecule with partial positive and negative charges like the poles of a magnet, so it can attract other polar substances.
9. Cohesion causes surface tension. Hydrogen - bonded water molecules at the surface are pulled more strongly together.
10. Water strider on water; water droplets on leaves.
11. Attraction between like - molecules, e.g., water droplet formation.
12. Attraction between different - molecules, e.g., water on glass.
13. Through transpiration - pull and capillary action. Capillary action is responsible and cohesion and adhesion are also involved.