1 / 6

Counting Atoms

Counting Atoms. Vocabulary and Steps. Chemical Symbol. Usually a one- or two-letter set of characters that is used to identify an element. Examples: H, He, Ne, W, Li, Ag. Compound Formula. A combination of symbols that shows the ratio of elements in a compound.

rfremont
Download Presentation

Counting 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. Counting Atoms Vocabulary and Steps

  2. Chemical Symbol • Usually a one- or two-letter set of characters that is used to identify an element. • Examples: H, He, Ne, W, Li, Ag

  3. Compound Formula • A combination of symbols that shows the ratio of elements in a compound. • Example: H2O (two hydrogen : one oxygen)

  4. Subscript • Shows the number of atoms of an element in a molecule or the ratio of elements in a compound. • No subscript means one. • Example: H2O • The two is the subscript for hydrogen so there are two hydrogens • Oxygen has no subscript so there is one oxygen

  5. Coefficient or Pre-Script • A number placed in front of a chemical formula in an equation. • No coefficient means one. • Example: 6CO2 • Six is coefficient, it is used for all the elements of the compound or molecule. • There are six carbons and twelve oxygens in the formula above.

  6. Counting ‘em Up!! • If there is a subscript, but no coefficient use the subscript for the element. • H2O (2 hydrogen, 1 oxygen) • If there is a coefficient, but no subscript use the coefficient for every element . • 2AgS (2 silver, 2 sulfur) • If there is a subscript and a coefficient multiply the coefficient by the subscript for each element. • 12CO2 (12 carbon, 24 oxygen)

More Related