Scientific Notation and Matter--Chemistry 11 by Tina Zhao

Scientific Notation:
-Scientists have developed a shorter method to express very large numbers. This method is called scientific notation. Any number in scientific notation will be between 1 to 10 and multiplied by a power of 10.

E.g. write  123,000,000,000 in scientific notation

First step: Put the decimal after the first digit and drop the zeros

Second step: you look the coefficient first.In this number coefficien will be 1.23.

Third step:count the number of places from the decimal to the end of the number.and then found exponent 

Answer:

*Numbers less smaller than 1 will have a negative exponent.

*Move decimal to the left-positive exponent

                                 rigth-negative exponent.

Rules for Multiplication in Scientific Notation:
1) Multiply the coefficients
2) Add the exponents (base 10 remains)
Example 1: (3 x 10⁴)(2x 10⁵) = 6 x 10⁹
Link for Scientific Notation practice :http://www.edinformatics.com/math_science/scinot_mult_div.htm
Rules for Division in Scientific Notation:
1) Divide the coefficients
2) Subtract the exponents (base 10 remains)
Example 1: (6 x 10⁶) / (2 x 10³) = 3 x 10³
Link for Science Notation practice:http://www.edinformatics.com/math_science/scinot_mult_divb.htm

what is Matter?
-Anything that has Mass and Takes up space.
What is Mass?
-A property of matter that cause it to have weight. Mass measures the resitance of an object to a change in its state of motion.

Matter

1.  Mixture                                                      

-have more than one set of properties                     

-physically combined                                         
-more than one kind of substance                             

 Homogenou:i)uniform throughout.ii)appear to have only one component.*solution,colloid                
Heterogeneous:i)non uniform.ii)appear to have more than one component.*suspension,mechanical mixture.                  

2. pure substance
-one set of properties
-one kind of particle
Element:i)simplest form of matter.ii)can't be decomposed.iii)made up pf atoms.*metal,non-metal,metalloids
Compound:i)made up of element.ii)smallest particle is called molecule.
*Ionic:acid,base salt
*covalent:organic compound