Download presentation
Published byJordan Shields Modified over 9 years ago
1
KEY CONCEPT Water’s unique properties allow life to exist on Earth.
3
Important Functions of Water
To dissolve life’s molecules Transport molecules and ions through living cells and tissues. Moves substances by diffusion- cellular transport To hold large molecules together by forming hydrogen bonds. For example-carbohydrates and proteins. To maintain optimum temperature (homeostasis) Acts as an insulator Expands when freezes-erosion and insulation
4
Properties of Water Water is a polar molecule- a molecule with an unequal distribution of charges. Oxygen-8 protons pull the electrons to one end and the single proton in the hydrogen atom gains a positive charge. Results- weak hydrogen bonds that are easily formed and broken.
5
Life depends on hydrogen bonds in water.
Water is a polar molecule. Polar molecules have slightly charged regions. O H _ + Nonpolar molecules do not have charged regions. Hydrogen bonds form between slightly positive hydrogen atoms and slightly negative atoms.
7
“Like dissolves like.” Polar solvents dissolve polar solutes. Nonpolar solvents dissolve nonpolar solutes. Polar substances and nonpolar substances generally remain separate.
8
Hydrogen bonds are responsible for three important properties of water.
high specific heat cohesion adhesion
9
Many compounds dissolve in water.
A solution is formed when one substance dissolves in another. A solution is a homogeneous mixture. Solvents dissolve other substances. Solutes dissolve in a solvent. solution
10
Some compounds form acids or bases.
An acid releases a hydrogen ion when it dissolves in water. high H+ concentration pH less than 7 more acidic stomach acid pH between 1 and 3
11
A base removes hydrogen ions from a solution.
low H+ concentration pH greater than 7 bile pH between 8 and 9 more basic
12
A neutral solution has a pH of 7.
pure water pH 7
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.