Biochemistry The Chemistry of Life

Matter Matter is anything that has mass and takes up space (volume). To determine the mass of an object you must use a triple beam balance. To determine the volume of an object you must use a graduated cylinder.

All matter is made up of atoms Atoms are the simplest form of matter. Each atom consists of protons, neutrons and electrons.

Atoms Protons and Neutrons are located in the nucleus of the atom. Electrons orbit the nucleus.

Protons have a positive charge. Neutrons have no charge. Electrons have a negative charge. The overall charge of an atoms is neutral therefore the number of electrons(-) must equal the number of protons(+).

Drawing an atom Before Drawing an atom, you must know the following: 1. Atomic Number: the number of protons in an atom 2. Atomic Mass: the Number of protons and neutrons in an atom.

Drawing an atom The number of electrons equals the number of protons Atomic Number equals the number of protons. Atomic Mass – Atomic Number equals the number of Neutrons

You can find these two things on the periodic table. Top number is the atomic number Bottom Number is the atomic mass(always round)

Or you can find this information The top number is the atomic mass and the bottom number is the atomic number 25 x 12

Finding the number of protons, neutrons and electrons Place the correct number of protons and neutrons in the nucleus of the atom. In the orbits surrounding the nucleus, the electrons float. In the first orbit only two electrons can stay, any other orbit can have 8.

Drawing atoms practice Draw the atom Oxygen

Isotopes Isotopes are atoms of the same element that have the same atomic number but different atomic mass. Therefore the atoms have the same number of protons but different number of neutrons. For example Carbon 12 and Carbon 14 are isotopesexample

Ions An ion is when the number of electrons doesn’t equal the number of protons. When this happens the atom is no longer neutral. If there are more protons than electrons, there will be a positive charge. If there are more electrons than protons there will be a negative charge.

Chemical Bonding Chemical Bonding is when 2 or more atoms are linked together to form a molecule. There are two types of chemical bonds: ionic and covalent. Ionic bonds Ionic bonds transfer electrons to form a bond. Covalent Bonds Covalent Bonds share electrons to form bond

Balancing Equations When writing a chemical equation the number of elements that go into a chemical equation must equal the number of elements that come out of an equation. 6H 2 O + 6CO > C 6 H 12 O 6 + 6O 2 The subscript(number below the element) tells how many of that element there are. The coefficient tells how many of the molecule there is.

pH Scale The ph scale measures the amount of acidity and alkalinity(basic) of a solution

pH Scale The lower the number on the pH scale the more acidic. The higher the number the more alkaline(basic) 7 is neutral. Pure water has a pH of 7.

Acids Acids are compounds that donate a hydrogen ion H+. The more H+ a solution gives off the more acidic it is Gastric Juices are a 2, while vinegar is 5

Alkaline Solutions or Bases Alkaline solutions are compounds that donate an OH- or hydroxide ion to a solution. The more OH- donated the more alkaline the solution.

Indicators In order to determine of something is alkaline or acidic, we use indicators. An indicator turns colors based on where the solution is on the pH scale. Litmus paper is the most common indicator. Red litmus paper turns blue in alkaline solution. Blue litmus paper turns red in acidic solutions.