Chap4 - Chem 200 Dr Saidane Lecture Notes Chapter 4...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Chem. 200 Dr. Saidane Lecture Notes Chapter 4 Chemical Equations and Reactions 1. A Chemical reaction is the process by which one or more substances, called reactants , are changed into one or more different substances called products . A chemical reaction is described by a chemical equation. Atoms of one reactant bond with atoms of another reactant to form products with a different combination and structure. 2. A chemical equation represents with symbols (see table 1) and formulas, the identities and relative amounts of the reactants and products in a chemical reaction. The law of conservation of mass must be satisfied in every chemical equation, meaning that atoms are neither created nor destroyed in the chemical reaction. The number of atoms of reactants must be the same as the number of atoms of products. 3. Balancing Chemical Equations Equalizing the number of atoms on each side of a chemical equation is called balancing the chemical equation . When balancing a chemical equation, a coefficient , which is a whole number , is added when necessary in front of the formula of the reactants and products. An equation must never be balanced by changing the subscripts in the chemical formulas. To balance a chemical equation it is best to: 4. Consider one element at a time. 5. Always start balancing the elements in the most complicated formula. 6. Balance first the element that occurs in the fewest formulas. 7.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 09/09/2011 for the course CHEM 200 taught by Professor Saidane during the Spring '11 term at Mesa CC.

Page1 / 5

Chap4 - Chem 200 Dr Saidane Lecture Notes Chapter 4...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online