Types of Reactions

Chemical Reactions

• The chemical reaction is a process in which a chemical change takes place.
• In a chemical reaction, atoms of the reactants are arranged to produce the products.
•  A substance that enters into the chemical reaction are called reactant.
• A substance that is produced by a chemical reaction is called product.
• In a chemical reaction the atoms are neither created nor destroyed
• When a chemical reaction takes place, there is always a change in the properties and the energy content of substances involved in the chemical reaction.

Questions:

1.  Define Chemical reaction.
2. Tell weather the following are true or false.

           a-In a chemical reaction the atoms are either created or destroyed.
           b-A substance that enters into the chemical reactions are called reactants.
     3.  To identify that a chemical reaction occurs, some changes are observed. What are these changes?

References :

Yaghi, M. (1999). Chemistry. Lebanese Educational Publishing Company s.a.l.

Costello, K. (2006). ChemistryLand Nucleus.Retrieved July 05, 2011, from http://www.chemistryland.com/CHM151/chm151home.html

What is the rate of Chemical reaction'

What is the rate of the Chemical Reaction?

• The rate of a reaction is a measure of how quickly reactants change into products.
• An increase in temperature, generally increases the rate of the reaction.
• A catalyst is a substance that speed up the reaction without itself being used up.

 

Questions:

1. Define the rate of the reaction.
2. Define the catalyst.
3. Does temperature play a role in chemical reactions? Justify. 

References:

Yaghi, M. (1999). Chemistry. Lebanese Educational Publishing Company s.a.l.

Costello, K. (2006). ChemistryLand Nucleus.Retrieved July 05, 2011, from http://www.chemistryland.com/CHM151/chm151home.html

Types of Chemical Reactions

                                                      Types of Chemical Reactions

1. Synthesis reaction: involves two or more substance to form another single substance. It releases energy.    ex: A + B -> AB
2. Decompostion reaction: is the opposite of the synthesis reaction in which the reactants are broken down into 2 or more substances. This reaction needs energy or heat to take place.                            ex : AB + heat-> A+B
3. Single Displacement Reaction: An element replaced another element in a compound. Note that not alll elements can be replaced by other ones. ex: A +BC -> AB+C
4.  Double replacement reaction: In this reaction cations from two different ionic compound trade or switch places. ex AB + CB -> AD+ BC.  

Questions:

1. How many types of Chemical Reactions are there?
2. Give example about each type of Chemical reactions?
3. All the types requires energy except which one?

References: 

Yaghi, M. (1999). Chemistry. Lebanese Educational Publishing Company s.a.l.

Costello, K. (2006). ChemistryLand Nucleus.Retrieved July 05, 2011, from http://www.chemistryland.com/CHM151/chm151home.html