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The hydrogen cyanide will bubble out of the solution, leaving behind the sodium sulfate that is still dissolved in the ­water. 2 The mixing of a silver sulfate solution with an aluminum chloride solution, results in the formation of aqueous aluminum sulfate and the precipitation of silver chloride. This is an example of a double displacement ­reaction. Types of Chemical ­Reactions 43 In the example of a double displacement reaction below, a silver sulfate (Ag2SO4) solution is mixed with an aluminum chloride (AlCl3) solution.

Here is another ­example: Al + 3 AgNO3 → Al(NO3)3 + 3 ­Ag element compound different ­ different compound ­ element In this reaction, the aluminum (Al) will take the place of silver (Ag) in the compound silver nitrate (AgNO3) because aluminum is more reactive, and, therefore, above silver in the activity ­series. But if a chemist placed metallic silver into hydrochloric acid, nothing would happen. That is because silver is not as reactive as hydrogen. It is below hydrogen in the activity series and it cannot replace the hydrogen in the ­reaction: Ag + 2 HCl → no ­reaction; element compound silver cannot take the place of ­hydrogen Many metals, such as zinc, iron, lead, copper, and aluminum are found chemically bonded to oxygen in nature.

Or kilograms. The time measurement might be in sec-­ onds, minutes, days, or even years. 56 Reaction ­Rates 57 In order for atoms, ions, or molecules to react, they must have two things: They must come into contact with one another and they must have enough kinetic energy. Kinetic energy is the energy an object has because of its motion. To speed up a reaction, the atoms, ions, or molecules must either collide more often, have more energy when they collide, or both. The following sections explain several ways in which the speed of a chemical reaction can ­change.

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