Based on your knowledge of factors affecting the rate of reaction, why is there a danger of explosions in places such as silos and coal mines where there are large quantities of powdered, combustible materials?
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Powdered materials have a higher surface area than solid materials. When large quantities of powdered, combustible materials are present, the chances of an effective collision are increased.
Due to decomposition reactions with oxygen or carbon dioxide in the air, meat begins to feel slimy and smell spoiled. Explain, using your knowledge of chemical kinetics, why meat spoils less rapidly when left unsliced.
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Unsliced meat would have a lower surface area. This means that fewer particles are exposed to the oxygen or carbon dioxide in the air, slowing the spoiling.
Why would iron filings rust faster than an iron nail?
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Iron filings have a greater surface area than the nail. This exposes a greater area of contact between the reactants.
Why would a mixture of gases react faster when the volume they occupy is decreased?
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When the volume of the gases is decreased, the particles are forced closer together. This increases the chances of an effective collision.
What are the FIVE major factors that affect reaction rate?
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nature of the reactants
concentration of the reactants
temperature
catalyst
surface area
What are the TWO characteristics of an effective collision?
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Particles must collide with the correct orientation and the proper amount of energy.