1 / 15

Atoms Elements and Compounds

Atoms Elements and Compounds. Chapter 22. An Element. An Element is a substance that cannot be broken down into simpler substances by chemical means. If we examine all the materials in the world around us we would find that there are about 100 elements from which everything is made.

Download Presentation

Atoms Elements and Compounds

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. Atoms Elements and Compounds Chapter 22

  2. An Element • An Element is a substance that cannot be broken down into simpler substances by chemical means. • If we examine all the materials in the world around us we would find that there are about 100 elements from which everything is made. • All of the elements known at the present time are listed in a table called the Periodic Table of Elements

  3. The Periodic Table of Elements

  4. Atoms • All substances are made up of tiny particles called Atoms • An Atom is the smallest part of an element that still has the properties of that element.

  5. Elements

  6. Some common Elements and their uses

  7. Compounds • What is a Compound? • A Compound is formed when two or more elements combine together chemically. • Although there are only a little over 100 elements there are millions of compounds.

  8. Examples of Compounds

  9. A Molecule • A molecule is the smallest part of an element or compound that can exist on its own. • Examples of Molecules of Elements:

  10. Molecules of Compounds A molecule of water is made up of two atoms of Hydrogen and an atom of Oxygen. The elements that make up compounds are always present in definite amounts.

  11. Properties of compounds • The properties of compounds are usually totally different from the properties of the elements from which they are made. Sodium (a reactive metal) + = Table Salt Chlorine (a poisonous gas)

  12. TextbookChapter22-Elements,CompoundsandMixtures A1. Atom. A2. Element. A3. Compound. A4. Molecule. A5. Molecule,atoms,atom. A6. CO2,atom,atoms. A7. Molecule,element,compound.

  13. A8. Hydrogen atoms, nitrogen atoms. A9. New properties. A10. Mixture, substances, mingled, chemically combined. A11. New. A12. Salt, water, steel. A13. Mixture, nitrogen,oxygen,water. A14. Water. A15. Mixture, magnet. A16. Compound, iron sulfide

  14. B1. (a) An atom is the smallest part of an element that still has the properties of that element. (b) An element is a substance that cannot be broken down into simpler substances by chemical means . (c) A compound is formed when two or more elements combine chemically. (d) A molecule is the smallest part of an element or compound that can exist on its own. (e) A mixture consists of two or more different substances mingled together but not chemically combined.

  15. B2. H, C, Cu, S, Fe, N, Zn, Al, Na, Cl, Ag, Au. B3. (a)neon, (b)iron, (c)gold, (d)aluminium, (e)copper, (f)mercury, (g)carbon, (h)lead, (i)oxygen, (j)fluorine, (k)chlorine, (l)helium.

More Related