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Need Chemistry Help? This section consists of notes and study guides on general chemistry concepts that are covered in high school and university level courses.



So, what is chemistry? Chemistry is the study of matter and the changes it undergoes. General chemistry is a science course that is commonly taken in college and high school. The course, as well as organic chemistry, is required for many health professional schools. Unfortunately, some of the concepts and equations covered in this course can be difficult. Therefore, many students need a lot of help in chemistry.



In order to do well in chemistry, thoroughly understand the key concepts and complete a lot of practice problems. Practicing problems will help you discover what kind of questions to expect on course exams and standardized exams. Also look for a chemistry study guide that organizes the concepts of each topic in a simple outline format. This should help you to avoid reading the textbook.



Chemist holding chemical in a chemistry flask



In this section, SG Learn Online will provide you with detailed notes on the major topics covered. If you are not too familiar with chemistry, we recommend that you visit the Chemistry Review section.





Chemistry Equations: Before you get started with the lessons in the chemistry help study guide section, discover some of the equations and formulas that are used in the science.



Significant Figures: Precision can play an important role in the scientific data. When calculating measurements, you will get an approximation in most cases. Significant digits are digits that carry meaning for the measurement and express a closer approximation of the value.



What is Matter: This is an essential topic in a Chem course and it relates to anything that has mass and can occupy space. Classifications of matter discussed include elements, molecules, atoms, compounds and mixtures.



Atom Structure: The basic building block or unit for the matter is the atom and understanding the atomic structure is important. A detailed discussion about the elementary particles: electrons, protons, and neutrons. Also discussed is the atomic number and the mass number and isotopes.



Atomic Theory: A little bit about history is covered in this section and the atom theory is discussed: elements are made up of atoms, compounds are made up of atoms of more than one element, and atoms can not be created nor destroyed.



Polyatomic Ions: identify of the commonly seen polyatomic ions that are useful for chemical reactions



Chemical Formulas: A brief introduction to the formulas and compounds in chemistry, such as molecular compounds and ionic compounds.



Chemical Bonds: Learn about the basic types of chemical bonds: covalent, polar covalent and ionic. This page gives brief details about the intermolecular forces.



Chemical Reactions: The types of reaction covered in this section include combination, combustion, decomposition, double replacement and single replacement reactions. Learn find out about the steps and rules to writing and balancing equations.



Stoichiometry: Stoichiometric problems are very important for chemistry and it is about calculating amounts of substances that are involved in a chemical reaction. You will learn more about stoichiometry in the limiting reagent section and then learn about the theoretical yield, actual yield and percent yield. These topics are important to understand in the stoichiometry problems. Reviewing the polyatomic ions may be helpful too!



Molarity and Molality: Molarity refers to the number of moles of solute in one liter of a saturated solution, whereas molality is the number of moles of solute dissolved in 1 kg of solvent.



Formal Charge: A brief discussion about the difference in valence electrons and the number of electrons attributed to an atom in the Lewis structure. Formal charges are helpful topics for introductory organic chemistry help.



What is Resonance: Resonance structures are another topic that will be useful in ochem (organic chemistry) and it discusses about how there is more than one Lewis structure to represent a certain molecule.



Gas Laws: Gas is an important topic in chemistry and learn about the different principles and the laws: Boyle’s Law, Charles’s Law and Avogadro’s Law.



Liquids and Solids: learn about the properties of the solid and the liquid phase. For the solid phase, we talk about the unit cell in a cubic crystal, simple cubic, body centered cubic, and face centered cubic.



Acid Base Reactions: Basic introduction about acids and bases. Definitions are provided and examples are given for different acid base reaction problems. A discussion about pH is also noted.



Redox Reaction: This section is about balancing oxidation and reduction reactions. The steps are given if you are using oxidation number changes or using half reactions.



The chemistry help section provides an opportunity for students to get a good grasp on introductory chemistry. These topics are detailed, yet simple. High school and college university students would be able to do well in the class by understanding the topics mentioned in the chem study guide and lesson notes.



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