In our chemistry help section, you'll find a broad range of topics from very basic chemistry all the way through some more advanced organic chemistry topics. Browse our chemistry topics below, or contact one of our chemistry tutors for private help. Before you get into the other topics, learning HOW to learn chemistry is a great place to start, and this section will help.
Almost everyone has heard of the periodic table, but do you know how to read it? This section gives you a thorough history of the periodic table, and explains how elements are divided and grouped in the table. Mixtures and solutions may seem to have a lot in common, but they're actually very different. Find out more here. Matter has a variety of different states, ranging from gases to solids.
Learn more about them in this section. What are the different bonds and how do you create a compound? Get some clarity in this thorough section. Let's learn more about writing simple chemical equations and types of reactions.
We cover a lot of ground here. What makes an acid or a base weak or strong? What are acids and bases in the first place? Polyatomic ions are ions with many atoms; they contain more than one element. They are charged just like regular ions; for example, an ion looks like this: Cl - , while a polyatomic ion looks like this: While the chloride ion only contains one element - chlorine - the chlorate ion contains both chlorine and oxygen.
Read this lesson for examples of other commonly known polyatomic ions. Electronegativity is a property of atoms that has to do with the tendency to attract electrons from another atom to form an ionic bond. Electronegativity is measured using the Pauling scale, which was instated by Linus Pauling. Read this lesson to find out all about electronegativity! All reactions can be classified as endothermic storing energy or exothermic releasing energy.
This lesson reviews the ways in which reactions store and give off energy, including items like heat, light, and mechanical energy. Once you've read this lesson, test yourself with a quick practice quiz to review the endothermic and exothermic concepts.
Hydrolysis occurs when one adds water to a compound, which causes the compound to break apart into a cation and an anion.
Then, water can bond chemically with the substance, changing its chemical form. These reactions often take place when ionic compounds dissolve in water. Read on to learn more about the process of hydrolysis!
When a reaction is in a state of dynamic equilibrium, the reaction is reversible. This means that, to maintain equilibrium, the products break apart to form the reactants. Read this lesson for more information on dynamic equilibrium! Enthalpy is a state function that is measured in kilojoules per mole. Enthalpy is abbreviated as H in the Gibbs free energy equation: Enthalpy can help an observer discern whether a reaction is endothermic or exothermic based on the enthalpy having a positive or negative value.
Read on to find out more about enthalpy! It is a spontaneous reaction that occurs naturally. Entropy measures the disorder of a system. Read this lesson to learn more about entropy!
Mass spectrometry is used to experimentally determine the molecular weight of a sample by ionizing a molecule and passing it through electrical and magnetic fields. The observer would then note how the ionized compound responds, which correlates with the molecular weight in a quantifiable way. Read on to learn more about the intricate process of mass spectrometry!
Hess's law is much like solving a puzzle using the change in entropy of a reaction. Hess's law requires a balanced equation with proper coefficients. Read on for more advice on implementing Hess's law! The Born-Haber cycle is a series of chemical processes that are used to calculate the lattice energy of ionic solids. The Born-Haber cycle can be thought of as a special case of Hess's law.
Read on for a definition of lattice energy as well as examples of how the Born-Haber cycle is used to calculate lattice energy. This page identifies different types of bonds, including covalent, polar covalent, ionic, and hydrogen. It explains how to draw compound structures by counting electrons and placing bonds accordingly.
The Octet and Duet rules are also explained here. This page details how electrons are arranged in an atom, including information about the orbitals s, p, d, and f and how to easily tell which orbital an electron is in. Electron delocalization can be really confusing!
In order to understand this concept, one must learn about resonance, bonding, and aromaticity. Read on for more information about electron delocalization! The Aufbau principle describes how electrons fill energy levels in an atom.
In order to write the electron configuration of an atom, one must know how the subshells fill. Using the diagonal rule will certainly help with this process.
Read on for more information about the Aufbau principle. Hybridization occurs when two atomic orbitals combine to form one hybrid orbital. One of the more common types of hybridization is sp 3 hybridization, which is described in detail in this lesson. Read on for more detailed information on the intricacies of electron orbitals. Electrolysis occurs in electrolytic cells when an electrical current causes a nonspontaneous oxidation-reduction reaction. This lesson describes how electrolysis is used, including extracting pure metals from the Earth's crust.
Read on for more information on the process of electrolysis! Voltaic cells use chemical energy to do electrical work. A redox reaction occurs, and the electrons are forced through an electrical circuit. Read on to find out the specifics on how voltaic cells power electrical processes! The study of nuclear reactions is called radiation chemistry. A nuclear reaction involves the nucleus of an atom. These types of processes were first discovered by Marie Curie in the late s. Read on for more details about radiation chemistry!
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