Concept Check Ch 3 (summer 2020) PDF

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Summary

These are concept check questions. Concept check questions are questions that cover the whole chapter, making sure you understand what the chapter is about . The chapter covered is chapter 3 The chemical buildings of life, from Unit 2: Cell Structure.
Concept check questions serve as a quest...

Description

Chapter 3 Concept Check Questions (Note: These questions serve as a study guide for your Exam)

Chapter 3 Concept Check Questions The answers to these questions can be found in the Narrated Chapter 3 PowerPoint Video #1

1.

What types of molecules are hydrophobic, what types are hydrophilic?

The non-polar molecules are hydrophobic, which means that they do not like water. The polar molecules are hydrophilic, which means that they are going to easily dissolve in water. 2. Are each of the following hydrophobic or hydrophilic? Hydrophilic: water DNA NaCl phosphate head groups proteins alcohol

Hydrocarbons

Hydrophobic: fatty acid tails Hydrocarbons proteins (?)

3. Which types of chemical bonds are dependent on a difference in electronegativity between two atoms? Polar covalent bond, ionic bonds, and hydrogen bonds 4. What are the emergent properties of water that make it essential for life? Cohesive behavior, ability to moderate temperature, expansion upon freezing, versatility as a solvent. 5. What chemical property (a type of bond) accounts for the majority of these emergent properties? Hydrogen bonds.

The answers to these questions can be found in the Narrated Chapter 3 PowerPoint Video #1 1.

What is an acid, a base, a buffer? Give an example of pH range for each.

An acid is a substance that increases the hydrogen ion concentration to make it more acidic. The pH range below 7.0

A base is a substance that reduce the concentration of the hydrogen ions, therefore, make the solution more basic. The pH range above 7.0 A buffer is a substance that minimize the change in the concentration of the 2 ions when acids and bases are added. The pH range varies. 2. The pH scale is a measure of what ion? Hydrogen ion. 3. What do you call a chemical that releases hydrogen ions (H+) when dissolved in water? An acid....