Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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can you please help me with these 3 questions? Thank you so much I'm really struggling
Transcribed Image Text:### Chemistry Fundamentals
**1. What is a polar covalent compound?**
A polar covalent compound is a type of chemical compound where the atoms involved in the bond have different electronegativities. This difference in electronegativity causes the electrons to be shared unevenly between the atoms, resulting in a molecule that has a partial positive charge on one end and a partial negative charge on the other. An example of a polar covalent compound is water (H₂O), where the oxygen atom is more electronegative than the hydrogen atoms, creating a dipole moment.
**2. Define hydrogen bond.**
A hydrogen bond is a weak bond that occurs between a hydrogen atom, which is covalently bonded to a more electronegative atom (such as oxygen, nitrogen, or fluorine), and another electronegative atom. This type of bond is significant in many biological processes and plays a crucial role in the properties of water and the structure of DNA. For instance, in water, hydrogen bonds form between the hydrogen atom of one water molecule and the oxygen atom of another water molecule.
**3. What is cohesion? Give an example.**
Cohesion refers to the attractive force between molecules of the same substance. This force causes the molecules to stick together. An example of cohesion is the behavior of water molecules, which tend to stick together due to hydrogen bonding. This property is responsible for phenomena such as water droplets forming beads on a surface and the ability of insects to walk on water.
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