1 / 25

Drawing Atoms

kareem
Download Presentation

Drawing Atoms

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. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 8/29/2011Objectives:Distinguish that homogenous mixtures are solutions and heterogeneous mixtures are colloids or suspensions.Interpret and create models (words or pictures) that represent atoms, molecules, elements, compounds, and mixtures at the particle level.Catalyst:Convert the following: 1. 0.25 km to nm2. 7.3 cL to L

  2. Drawing Atoms • Atoms are the smallest unit of matter • They are too small to see except with the most powerful microscopes, so we draw them to help us understand

  3. What do we call these things? An Atom 3 Atoms

  4. Drawing molecules • Molecules are groups of atoms that are joined together • These atoms can be of the same or different elements

  5. Substances • All molecules are the same • Element: all atoms are the same • Compound: there are different atoms within the molecule, but each molecule is the same

  6. element This molecule is 2 atoms joined together but we don’t call it “2 atoms joined together” we say it is one molecule compound This molecules is 4 atoms of two different types joined together to make a compound

  7. Pure substances include: • Elements are found on the periodic table • Some elements are: iron, gold, silver, aluminum, and carbon • Compounds are bonded groups of atoms • some basic compounds are: Carbon monoxide (CO), and carbon dioxide (CO2), water (H2O), hydrogen peroxide (H2O2).

  8. Mixtures • Molecules are not all the same

  9. Element vs.Compounds vs. mixtures ElementCompoundMixture Single atom two different two or more Or group of atoms joined molecule types Same atoms *heterogenous (looks different throughout) *homogenous (looks the same throughout)

  10. Many things we experience are mixtures of elements and compounds: • Heterogenous: • Coke (bubbles) • Milk (globs of fat) • Chocolate chip cookies (chocolate chips) • Homogenous: • Kool-Aid • The air • Vinegar

  11. Homogenous v. Heterogenous Atoms/Molecules evenly spread throughout Atoms/Molecules separated or “clumped”

  12. atoms of one Element Atoms of the same Element (Gas) (Solid)

  13. Another element A mixture of two elements This one likes to go round in pairs as a gas (molecules)

  14. This is not a mixture, it is a COMPOUND of two elements This is just a mixture of two elements

  15. Definitions • Matter – anything that occupies space and has mass • Physical properties – properties that can be observed and measured without changing the chemical makeup of the substance • Density – mass of material within a given volume • Aqueous solution – a solution in which something is dissolved in water.

  16. Definitions • Mixture – combination of substances in which each substance retains its individual properties • Suspension – a mixture containing large, dispersed solid particles that can settle out or be separated by filtration • Colloid – a mixture containing solid particles small enough to remain suspended and not settle out • Tyndall effect – the scattering of a beam of light caused by reflection from suspended particles

  17. Definitions • Solution – a homogeneous mixture of two or more substances • Solvent – the thing doing the dissolving • Solute – the thing getting dissolved

More Related