Question

just accept their results?
unit 2: properties of water, m
question 6
list the 4 types of macromolecules:
1.
2.
3.
4.
question 7
what type of macromolecule is glucose?

question 8
what type are the 2 types of nucleic acids?
1.
2.
question 9
how are these words different from each other:
cohesion vs. adhesion:

solute vs. solvent:

acid vs. base:

question 10
match the property with what it means:
property\twhat it me
cohesion\twater abso
\t\tchange in t
adhesion\twater expa
high heat capacity\twater mole
ice is less dense than liquid water\twater mole
\t\t\surface te
question 11
how does a catalyst affect activation energy?

Explanation:

Question 6:

Macromolecules are large molecules essential for life. The four types are based on biological classification:

1. Carbohydrates: Include sugars, starches, etc., for energy and structure.
2. Lipids: Fats, oils, waxes, used for energy storage, insulation, etc.
3. Proteins: Made of amino acids, involved in structure, enzymes, transport, etc.
4. Nucleic Acids: DNA and RNA, carry genetic information.

Question 7:

Glucose is a simple sugar (monosaccharide), which is a building block of carbohydrates. Carbohydrates are macromolecules (polysaccharides are made of monosaccharides like glucose) or the monosaccharide itself is a carbohydrate - type molecule (though technically, monosaccharides are the monomers, and carbohydrates as a macromolecule can refer to polysaccharides, but glucose is a carbohydrate - class molecule).

Question 8:

Nucleic acids are of two types:

1. DNA (Deoxyribonucleic Acid): Stores genetic information.
2. RNA (Ribonucleic Acid): Involved in protein synthesis, gene expression, etc.

Question 9:

• Cohesion vs. Adhesion:
• Cohesion: Attraction between molecules of the same substance (e.g., water molecules sticking to each other, causing surface tension).
• Adhesion: Attraction between molecules of different substances (e.g., water sticking to the sides of a glass tube, causing capillary action).
• Solute vs. Solvent:
• Solute: The substance that is dissolved in a solution (e.g., salt in salt - water).
• Solvent: The substance that dissolves the solute (e.g., water in salt - water, the dissolving medium).
• Acid vs. Base:
• Acid: A substance that donates protons ($H^+$) or increases the $H^+$ concentration in a solution (pH < 7), tastes sour, etc.
• Base: A substance that accepts protons or increases the $OH^-$ concentration in a solution (pH > 7), tastes bitter, feels slippery, etc.

Question 10:

(Assuming the "What It Means" column has typical definitions, though some text is cut off. Here are the correct matches based on standard properties of water: )

• Cohesion: Water molecules stick to each other (related to surface tension, e.g., water forming drops).
• Adhesion: Water molecules stick to other substances (e.g., water climbing up a paper towel or glass tube).
• High Heat Capacity: Water absorbs a lot of heat energy with a small change in temperature (helps regulate temperature in organisms and the environment).
• Ice Is Less Dense Than Liquid Water: Water expands when it freezes, so ice (solid water) is less dense than liquid water (this is why ice floats).

Question 11:

A catalyst (like an enzyme in biological systems) lowers the activation energy of a chemical reaction. Activation energy is the minimum energy required for a reaction to occur. By lowering this energy, the reaction can proceed faster (more reactant molecules have enough energy to react at a given temperature).

Answer:

Question 6:

1. Carbohydrates
2. Lipids
3. Proteins
4. Nucleic Acids

Question 7:

Carbohydrate (specifically a monosaccharide, which is a type of carbohydrate - related macromolecule or monomer of carbohydrates)

Question 8:

1. DNA (Deoxyribonucleic Acid)
2. RNA (Ribonucleic Acid)

Question 9:

• Cohesion: Attraction between same - substance molecules; Adhesion: Attraction between different - substance molecules.
• Solute: Substance dissolved; Solvent: Substance that dissolves solute.
• Acid: Donates $H^+$ (low pH); Base: Accepts $H^+$ (high pH).

Question 10:

• Cohesion: Water molecules stick to each other (e.g., surface tension)
• Adhesion: Water molecules stick to other substances (e.g., capillary action)
• High Heat Capacity: Water absorbs much heat with little temp change
• Ice Is Less Dense Than Liquid Water: Water expands when freezing

Question 11:

A catalyst lowers the activation energy of a reaction.