Biology Test 2 Part 2

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1. Rainwater has a pH of about 5.6; therefore, rainwater is

Explanation

Rainwater has a pH of about 5.6, which is below 7 on the pH scale. A pH below 7 indicates acidity, so rainwater is considered an acidic solution.

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Biology Test 2 Part 2 - Quiz

Biology Test 2 Part 2 explores key concepts in molecular biology, focusing on properties of water, types of bonds, and their biological implications. This quiz assesses understanding of hydrogen bonds, water's cohesive nature, and heat capacity, crucial for students in advanced biology courses.

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2. Water can absorb a large amount of heat without much change in temperature, and therefore it has

Explanation

Water has a high heat capacity because it can absorb a large amount of heat without a significant change in temperature. This is due to the strong hydrogen bonding between water molecules. When heat is added to water, the hydrogen bonds absorb the energy and prevent the temperature from rising rapidly. This property of water is important for regulating temperature in living organisms and for moderating climate on Earth.

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3. Which of these best describes the changes that occur when a solution goes from pH 5 to pH 8?

Explanation

pH is a measure of the concentration of hydrogen ions in a solution. A pH of 5 indicates an acidic solution with a higher concentration of hydrogen ions, while a pH of 8 indicates a basic solution with a lower concentration of hydrogen ions. Therefore, as the solution goes from pH 5 to pH 8, the hydrogen ion concentration decreases.

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4. An example of a hydrogen bond would be the

Explanation

A hydrogen bond is a type of intermolecular bond that occurs when a hydrogen atom is bonded to a highly electronegative atom (such as oxygen or nitrogen) and is attracted to another electronegative atom nearby. In the case of two water molecules, the oxygen atom in one molecule is attracted to the hydrogen atom in the other molecule, forming a hydrogen bond. This bond is important in the unique properties of water, such as its high boiling point and surface tension.

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5. In which of these are the electrons always shared unequally?

Explanation

In a polar covalent bond, the electrons are always shared unequally between the two atoms. This is because one atom has a higher electronegativity than the other, causing it to attract the shared electrons more strongly. As a result, the electron density is shifted towards the more electronegative atom, creating partial positive and negative charges within the molecule. This unequal sharing of electrons in a polar covalent bond leads to the formation of a dipole, which can result in unique chemical properties and interactions.

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6. Acids

Explanation

Acids release hydrogen ions in solution. This is because acids are substances that can donate protons (H+) to a solution. When an acid dissolves in water, it releases these hydrogen ions, which are responsible for the acidic properties of the solution. The release of hydrogen ions lowers the pH of the solution, making it more acidic. Therefore, the correct answer is that acids release hydrogen ions in solution.

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7. Water flows freely, but does not separate into individual molecules because water is

Explanation

Water flows freely because it is cohesive. Cohesion refers to the attraction between molecules of the same substance, and in the case of water, it is due to the hydrogen bonding between water molecules. This cohesive force allows water molecules to stick together, forming a continuous flow. It prevents the water from separating into individual molecules and allows it to maintain its liquid state.

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8. When water dissociates, it releases

Explanation

When water dissociates, it releases equal amounts of H+ and OH– ions. This is because water molecules can ionize into H+ ions (protons) and OH– ions (hydroxide ions). The concentration of H+ ions is equal to the concentration of OH– ions, resulting in a neutral solution. This is known as the self-ionization of water.

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9. If a chemical accepted H+ from the surrounding solution, the chemical could be

Explanation

If a chemical accepts H+ ions from the surrounding solution, it means that it is capable of donating or releasing H+ ions. This behavior is characteristic of acids, as they are substances that can donate protons or H+ ions. Therefore, the correct answer is "an acid".

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10.  This Graph illustrates

Explanation

The graph in question likely shows the relationship between the density of ice and water. It is known that ice is less dense than water, which is why it floats on water. However, it is also true that ice can be more dense than water under certain conditions. This can occur when the ice is subjected to high pressure, causing the water molecules to pack more closely together. Therefore, both statements are correct.

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11. Which of these properties of water cannot be attributed to hydrogen bonding between water molecules?  

Explanation

The property of water being a solvent for many molecules is not directly attributed to hydrogen bonding between water molecules. It is primarily due to the polar nature of water molecules, which allows them to interact with and dissolve other polar or charged molecules. Hydrogen bonding, on the other hand, is responsible for properties such as water's high boiling point, surface tension, and cohesion.

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Rainwater has a pH of about 5.6; therefore, rainwater is
Water can absorb a large amount of heat without much change in...
Which of these best describes the changes that occur when a solution...
An example of a hydrogen bond would be the
In which of these are the electrons always shared unequally?
Acids
Water flows freely, but does not separate into individual molecules...
When water dissociates, it releases
If a chemical accepted H+ from the surrounding solution, the chemical...
 This Graph illustrates
Which of these properties of water cannot be attributed to hydrogen...
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