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Questions and Answers
How many neutrons do potassium-39 and potassium-40 have, respectively?
How many neutrons do potassium-39 and potassium-40 have, respectively?
Potassium-39 has 20 neutrons. Potassium-40 has 21 neutrons.
Which of the following statements is true of a neutral magnesium atom?
Which of the following statements is true of a neutral magnesium atom?
Which type of bond represents a weak chemical bond?
Which type of bond represents a weak chemical bond?
Hydrogen bond
An isotope of sodium (Na) has a mass number of 22. How many neutrons does it have?
An isotope of sodium (Na) has a mass number of 22. How many neutrons does it have?
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Which of the following statements is not true?
Which of the following statements is not true?
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Using a pH meter, you find the pH of an unknown solution to be 8.0. How would you describe this solution?
Using a pH meter, you find the pH of an unknown solution to be 8.0. How would you describe this solution?
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Approximately how much of an increase in hydrogen ion concentration is there between tomato juice and lemon juice if lemon juice has a pH of 2.0 and tomato juice has a pH of 4.0?
Approximately how much of an increase in hydrogen ion concentration is there between tomato juice and lemon juice if lemon juice has a pH of 2.0 and tomato juice has a pH of 4.0?
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An example of a monosaccharide is ___________.
An example of a monosaccharide is ___________.
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Cellulose and starch are examples of ___________.
Cellulose and starch are examples of ___________.
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Phospholipids are important components of ___________.
Phospholipids are important components of ___________.
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The monomers that make up proteins are called ___________.
The monomers that make up proteins are called ___________.
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Why are hydrogen bonds and van der Waals interactions necessary for cells?
Why are hydrogen bonds and van der Waals interactions necessary for cells?
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Why can some insects walk on water?
Why can some insects walk on water?
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Explain why water is an excellent solvent.
Explain why water is an excellent solvent.
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Explain at least three functions that lipids serve in plants and/or animals.
Explain at least three functions that lipids serve in plants and/or animals.
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Explain what happens if even one amino acid is substituted for another in a polypeptide chain. Provide a specific example.
Explain what happens if even one amino acid is substituted for another in a polypeptide chain. Provide a specific example.
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Study Notes
Neutrons in Potassium Isotopes
- Potassium-39 contains twenty neutrons.
- Potassium-40 contains twenty-one neutrons.
Neutral Magnesium Atom Characteristics
- A neutral magnesium atom has 12 protons, 12 electrons, and 12 neutrons.
Weak Chemical Bond
- Hydrogen bonds represent a weak type of chemical bond.
Neutrons in Sodium Isotope
- An isotope of sodium with a mass number of 22 contains 11 neutrons.
Misconception About Water in Atmosphere
- Water is not the most abundant atom in Earth's atmosphere.
pH Meter Reading
- A solution with a pH of 8.0 is described as weakly basic.
Hydrogen Ion Concentration in Juices
- Lemon juice (pH 2.0) has a hydrogen ion concentration approximately 100 times greater than that of tomato juice (pH 4.0).
Examples of Monosaccharides
- Common monosaccharides include fructose, glucose, and galactose.
Polysaccharide Examples
- Cellulose and starch are classified as polysaccharides.
Function of Phospholipids
- Phospholipids are crucial components of the plasma membrane in cells.
Protein Building Blocks
- Amino acids serve as the monomers that compose proteins.
Role of Hydrogen Bonds and Van der Waals Interactions
- These weak interactions are essential for molecular associations, providing structural integrity to proteins and DNA, and contribute to the unique properties of water necessary for life.
Insect locomotion on Water
- Certain insects can walk on water due to surface tension, which arises from cohesion among water molecules at the liquid-air interface.
Water as an Excellent Solvent
- Water's polarity allows it to stabilize charged particles and prevent reassociation of ions, facilitating dissolution.
Functions of Lipids
- Lipids serve multiple roles including energy storage, insulation, and as essential components of cell membranes (phospholipids and steroids).
Impact of Amino Acid Substitution on Polypeptides
- Substituting even one amino acid can alter protein structure and function; for example, sickle cell anemia results from a single amino acid change in hemoglobin, leading to crescent-shaped red blood cells with serious health consequences.
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Description
Test your knowledge of important concepts from Chemistry Chapter 2 with these flashcards. Explore topics such as isotopes, atomic structure, and chemical bonds through various questions and answers. Enhance your understanding of the fundamental principles of chemistry.
