Water polar molecules and an intro to solutions
Download
1 / 32

Water, Polar molecules, and an Intro to Solutions - PowerPoint PPT Presentation


  • 97 Views
  • Uploaded on

Water, Polar molecules, and an Intro to Solutions. Review of bond types. Review of bond types. Review of bond types. Polar Molecules. If a molecule contains polar covalent bonds, the entire molecule may have a positive end and a negative end.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Water, Polar molecules, and an Intro to Solutions' - candace-gentry


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript




Polar molecules
Polar Molecules

  • If a molecule contains polar covalent bonds, the entire molecule may have a positive end and a negative end.

  • This would then be classified as a polar molecule.


Polar molecules1
Polar molecules

  • Not all molecules that contain polar covalent bonds are polar molecules.

  • This can be due to the shape of the molecule.




Intermolecular forces
Intermolecular Forces

  • Van der Waals forces

    • Dipole dipole – attractive force between polar molecules

    • London dispersion force – attractive force between all molecules


  • Hydrogen bonds

  • A strong dipole-dipole force between a positive hydrogen atom of one molecule, and a highly electronegative atom (N, O, F) in another molecule.


Water essential for life
Water: Essential for Life

  • 70% of the earth is covered in water yet only 3 % of it is fresh water and only 1 % of this is water is in a liquid state.

  • Canada has the most abundant supply of fresh water in the world but this doesn’t mean that we shouldn’t learn how to conserve water.



Physical properties of water
Physical properties of water Energy from the sun causes water to evaporate, dissolved contaminants are left behind as it rises. When the water condenses it returns to earth as precipitation.

  • Pure water is colourless, odourless, and tasteless.

  • Whether or not an object sinks or floats relates to its density compared to water.

    • Pure water density = 1.0 g / mL


  • Water is unique in the fact that its Energy from the sun causes water to evaporate, dissolved contaminants are left behind as it rises. When the water condenses it returns to earth as precipitation. density decreases when it becomes a solid, this is what causes ice to float.

  • This in turn acts a blanket which prevents the water underneath from freezing and killing all life.


  • Heat capacity Energy from the sun causes water to evaporate, dissolved contaminants are left behind as it rises. When the water condenses it returns to earth as precipitation. is a measure of how much heat it takes to heat one gram of a substance 1 ° C.

  • Water requires 4.18 J of heat to increase the temperature of 1 gram 1 ° C.


Chemical properties of water
Chemical Properties of Water Energy from the sun causes water to evaporate, dissolved contaminants are left behind as it rises. When the water condenses it returns to earth as precipitation.

  • Water is a polar molecule that consists of oxygen and hydrogen molecules. The oxygen has a larger electronegativity and so it creates a partial – charge as it draws hydrogen’s electrons closer to it.

  • Draw this







What s in polluted water
What’s in Polluted Water? contaminated easily.

  • As the amount of human activity increases the amount of contaminants found in nearby water also increase. Contaminants are classified into three types.


1 physical contaminants
1. Physical Contaminants contaminated easily.

  • Objects that do not dissolve in water.

    • Ex – oil, plastic, tree branches, leaves, peat, silt.


2 biological contaminants
2. Biological Contaminants contaminated easily.

  • Biological contaminants include bacteria and viruses which may make the water unsafe to consume.


3 chemical contaminants
3. Chemical Contaminants contaminated easily.

  • Chemicals that are soluble in water.

    • Ex – metal ions, pesticides, fertilizers.

  • These are not visible but can lead to visible effects such as an algae bloom


Solutions
Solutions contaminated easily.

  • Most substances contain water because it is so good at dissolving other substances.

  • AKA the “Universal Solvent”

    • Technically it is not universal because water does not dissolve non-polar substances. Only non-polar can dissolve non-polar.

  • All aqueous solutions use water as the solvent and are transparent.


  • A solution is a contaminated easily. homogeneous mixtureof substances composed of at least onesoluteand one solvent that are uniform throughout the sample. This can be in a liquid or gas state.


  • Solute – contaminated easily. A substance that is dissolved in a solvent

  • Solvent – The medium in which a solute is dissolved.


Properties of aqueous solutions
Properties of Aqueous Solutions contaminated easily.

  • Compounds can be classified as either electrolytes or non-electrolytes.

  • Electrolytes – solutes that form aqueous solutions that conduct electricity.


  • Non-electrolytes – contaminated easily. solutes that form aqueous solutions that do not conduct electricity.



ad