The balanced equation is: Since silver is below hydrogen, it is not capable of replacing hydrogen in a reaction with an acid. The chemical equation for the reaction of methane with oxygen is shown: The equation above, called a skeleton equation, is an equation that shows only the formulas of the reactants and products with nothing to indicate the relative amounts. Silver metal dissolves in hot concentrated sulphuric acid. The cup shown above provides an example of tarnish, a chemical reaction caused when silver metal reacts with hydrogen sulfide gas produced by some industrial processes or as a result of decaying animal or plant materials: The tarnish can be removed using a number of polishes, but the process also removes a small amount of silver along with the tarnish. The Table below is an activity series of most common metals and of the halogens. Word equations are used to describe the conversion of reactants to products. The trick is to get the marshmallow a nice golden brown without catching it on fire. Silver metal dissolves in hot concentrated sulphuric acid. When the rim is combined with a tire, the product can be put on a car and used for a safe and comfortable ride. Both are double-replacement reactions. Therefore, the nickel metal will be capable of replacing the lead in a reaction, but will not be capable of replacing iron. Hydrogen remains the same at +1 and sulfur remains at an oxidation state of -2 on both sides of the equation. The nitrate ions and the chlorine atoms are unbalanced. Methane is the major component of natural gas and is commonly burned on a gas stove or in a Bunsen burner (figure below). The 2 in front of the H 2 means that there are a total of  atoms of hydrogen as reactants. It will also react with steam and with acids, since that requires a lower degree of reactivity. Combination reactions occur when two or more substances combine to form a new substance. What are the usual reactants in a double-replacement reaction? Another kind of double-replacement reaction is one that produces a molecular compound as one of its products. Oxygen gas is a diatomic molecule. Acid rain degrades marble statues like the one on the left (A). The cations of both reactants are +1 charged ions, while the anions are -1 charged ions. Combination reactions can also be called synthesis reactions. The trees in the forest on the right (B) have been killed by acid rain. Zinc reacts with hydrochloric acid to produce aqueous zinc chloride and hydrogen ( Figure below ). John Dalton’ atomic theory said that chemical reactions basically involve the rearrangement of atoms. Sulfur reacts with oxygen to form sulfur dioxide. If not, write NR. The post Predict the reaction products when silver sulfide is added to water by writing a balanced chemical equation. If the reaction does occur, write the products of the reaction and balance the equation. Are elements always the product of a decomposition reaction? Below are guidelines for writing and balancing chemical equations. Transition metals are capable of adopting multiple positive charges within their ionic compounds. (A) http://commons.wikimedia.org/wiki/File:Acid_rain_woods1.JPG; (B) http://commons.wikimedia.org/wiki/File:Pollution_-_Damaged_by_acid_rain.jpg . The thermally stable silver difluoride, silver(II) difluoride, AgF2, is formed in the reaction of silver metal and fluorine, F2. The word equation for the process is: The silver and the sulfur are the reactants in the equation, while the silver sulfide is the product. In order for a reaction to occur, one of the products is usually a solid precipitate, a gas, or a molecular compound such as water.

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