This frequently causes problems!
Chemical Reactions Photo by: It involves making and breaking chemical bonds and the rearrangement of atoms. Chemical reactions are represented by balanced chemical equations, with chemical formulas symbolizing reactants and products.
For specific chemical reactants, two questions may be posed about a possible chemical reaction. First, will a reaction occur? Second, what are the possible products if a reaction occurs? This Sulfur reacting to heat. The most reliable answer is obtained by conducting an experiment—mixing the reactants and then isolating and identifying the products.
We can also use periodicity, since elements within the same group in the Periodic Table undergo similar reactions. Finally, we can use rules to help predict the products of reactions, based on the classification of inorganic chemical reactions into four general categories: Reactions may also be classified according to whether the oxidation number of one or more elements changes.
Those reactions in which a change in oxidation number occurs are called oxidation—reduction reactions. One element increases its oxidation number is oxidizedwhile the other decreases its oxidation number is reduced.
Combination Reactions In combination reactions, two substances, either elements or compounds, react to produce a single compound. One type of combination reaction involves two elements.
Most metals react with most nonmetals to form ionic compounds. The products can be predicted from the charges expected for cations of the metal and anions of the nonmetal. For example, the product of the reaction between aluminum and bromine can be predicted from the following charges: Since there is a change in the oxidation numbers of the elements, this type of reaction is an oxidation—reduction reaction: The composition of the product is predicted from the common oxidation numbers of the elements, positive for the less reactive and negative for the more reactive nonmetal usually located closer to the upper right side of the Periodic Table.
For example, sulfur reacts with oxygen gas to form gaseous sulfur dioxide: Carbon monoxide, formed by the burning of hydrocarbons under conditions of oxygen deficiency, reacts with oxygen to form carbon dioxide: Two compounds may react to form a new compound.
For example, calcium oxide or lime reacts with carbon dioxide to form calcium carbonate limestone: The products of a decomposition reaction are determined largely by the identity of the anion in the compound.
The ammonium ion also has characteristic decomposition reactions.Writing, Balancing and Predicting Products of Chemical Write a balanced equation for the reaction.
Solving Process: Step 1. Write the word equation: The following are some general types of decomposition reactions. 1. If some acids are heated, they . Contents. Introduction; Reactions and Heat; Black Powder; Fulminate; High Explosives; Smokeless Powder; Aromatic Explosives; Pyrotechnics; Fireworks; Safety; References.
Thermal decomposition of sodium chlorate, NaClO3, should yield sodium chloride and oxygen as the products. 2NaClO3(s) = 2NaCl(s) + 3O2(g).
This page may be out of date. Save your draft before refreshing this page. All reactants and products of a reaction must be known before attempting to write an equation. Identify the reactants and products and write their chemical symbols or formulas CORRECTLY.
Indicate the state of substances: (g) for gas, (l) for liquid, (s) for solid, and (aq) for aqueous solution. Below you will find my initial comments (there will likely be more after some reflection) and draft answers to the Free Response questions that were released by the College Board earlier today.
As ever, these are in draft form and I would be happy to receive comments and corrections. General comments Based upon the [ ]. Note: I've noticed a lot of people linking here. I do not own the rights to this book. I originally made this page a long time ago to easily .