Energy in Reactions. Types of Reactions. Balancing Equations. Demonstrations/Experiments. Limiting Reagents. Kinetics and Equilibria. Learning Chemistry Easily: The Chemical Reaction, An Introduction. Hello,
Changes in Identity of Matter. Chemical Reactions This module contains lessons about the chemical interactions between molecules and/or atoms.
These interactions are chemical reactions and always result in a rearrangement of atoms. – Chemical reactions are the processes by which electrons are shared or transferred. This process often produces atoms with lower potential energies. These more stable atoms become more like the noble gases (same electron configurations). GoREACT. The world is your laboratory!
Experiment with chemistry virtually anywhere with goREACT! In this drag-and-drop laboratory, combine elements from the Periodic Table to create chemical reactions and discover the chemistry in the world around you! With goREACT, you can become a virtual chemist. Whether you're a novice or expert, the free play and guided modes make it fun and fascinating. Initiate nearly 300 virtual chemical reactions by dragging elements into the Reaction Area.Amazing images and videos illustrate the molecules you create.Select alternate views of the Periodic Table to discover different aspects of the elements’ chemical properties.Touch any of the Periodic Table's 118 elements to see an image and fun fact about it.With helpful hints about reactions to try, there’s always something exciting to explore. Play Online » Chemical Reactions and Stoichiometry. Making and Breaking Bonds. Bonding Models and Lewis Structures: Crash Course Chemistry #24.
Preparation of soap from fat - Chemistry. Law of Conservation of Mass experiment. Beautiful Reactions. Precipitation Chemical Garden Color Change Metal Displacement Crystallization.
The-Chemistry-of-Sparklers.png (PNG Image, 2480 × 1754 pixels) - Scaled (41%) Chemistry 604: Word Equations and Balancing. Instructions Before viewing an episode, download and print the note-taking guides, worksheets, and lab data sheets for that episode, keeping the printed sheets in order by page number.
During the lesson, watch and listen for instructions to take notes, pause the video, complete an assignment, and record lab data. See your classroom teacher for specific instructions. Note Taking Guide. Chemical Reactions. Chemical Equations. Reversible Reactions - PhET. Reactants, Products and Leftovers - PhET. Balancing Chemical Equations - PhET. Activation energy: Kickstarting chemical reactions - TedED. Enzymes: You heard a little about Sam and his team of MODS, but what is an enzyme and what is its role in a chemical reaction?
Find out more about enzymes through this video lecture and this online learning module Enzyme Catalyzed Reactions: Most of us learn best by doing. Each of these virtual labs will help you to understand different factors that can affect the activity of enzymes. And Activation Energy: The idea of activation energy is critical to any biological process. Real World: Sometimes appreciating the role of invisible molecules, such as enzymes, is easier when it can be placed in the context of our everyday experiences. The deadly irony of gunpowder - TedED. The Chemistry of Pizza - Reactions. A Basic Rule of Chemistry Can Be Broken, Calculations Show. Most of us learned in high school chemistry class that chemical bonds can only form when electrons are shared or given away from one atom’s outer shell to another’s.
But this may not be strictly true. A chemist has calculated that under very high pressure not just the outer electrons but the inner ones, too, could form bonds. Inside atoms, electrons are organized into energy levels, called shells, which can be thought of as buckets of increasing size that can each hold only a fixed number of electrons. Atoms prefer to have filled buckets, so if their outer shell is missing just one or two electrons, they are eager borrow form another atom that might have one or two to spare. But sometimes, a new study suggests, atoms can be incited to share not just their outer valence electrons, but those from their full inner shells.
Don’t Go in the Water: The Chemistry of Pee in the Pool [Video] Writing word equations. Example: When calcium hydroxide reacts with hydrochloric acid in water, dissolved calcium chloride and water are formed.
This reaction gives off heat. How to solve a problem like this: Step 1: Write the unbalanced equation by translating the written names into chemical formulas In this case, the formulas you need to know are those for calcium hydroxide, hydrochloric acid, calcium chloride, and water. When you translate these into their formulas, you should get the unbalanced equation: Ca(OH)2 + HCl --> CaCl2 + H2O If you've forgotten how to write formulas, visit here for more info about writing formulas for ionic compounds and here for writing formulas for covalent compounds. Step 2: Balance the equation You need to balance the equation to ensure that the chemical reaction follows the law of conservation of mass, which says that you've got to have the same number of atoms of each element on both sides of the equation.
For this reaction, the equation, when balanced, looks like this: The Stoichiometry of Product Formation and Percent Yield. In another tutorial, we considered the amount of reactant consumed by a chemical reaction.
Here, we'll consider the amount of product formed by a reaction. Product Formation and Percent Yield Movie Text One of the things reaction stoichiometry allows us to do is determine the amount of product formed from a given amount of reactant. As an example, consider the reaction that Joseph Priestley used to discover oxygen. HgO → Hg + O2 Priestly heated up HgO, which produced Hg and O2 gas. We begin by balancing the chemical reaction. Reaction Stoichiometry. Reaction stoichiometry allows us to determine the amount of substance that is consumed or produced by a reaction.
The following video considers the first part of this: how much of a reactant is consumed in a chemical reaction. Product formation is discussed elsewhere. Reaction Stochiometry Movie Text Stoichiometry was first discovered by Jeremias Richter, a German chemist. It was Richter who coined the term stoichiometry, a tongue-twisting word that baffles students to this day. Chemical Reactions. Orientation of Collisions. Activation Energy. Composition of Reacting Mixtures. For certain mixtures, reactions can be used to determine the relative composition of a mixture.
This is illustrated in the following video. Composition of Mixtures Movie Text On another page, we talked about using elemental analysis as a qualitative analysis technique. In that case, we had a pure mineral and we wanted to determine what type of mineral it was. By performing an elemental analysis, we could determine the empirical formula.