Increasing the surface area of a solid reactant increases the frequency of molec
ID: 485075 • Letter: I
Question
Increasing the surface area of a solid reactant increases the frequency of molecular collisions. increases the energy of molecular collisions. increases both the frequency and energy of molecular collisions. lowers the activation energy of the reaction. The presence of a reaction catalyst increases the frequency of molecular collisions. increases the energy of molecular collisions. increases both the frequency and energy of molecular collisions. lowers the activation energy of the reaction. Which has a greater surface area? 1 kg of wood sawdust a piece of solid wood with a mass of 1 kg The rate of a reaction usually doubles for every 10 degree C increase in temperature. Is heat a catalyst? Explain. ___ What precautions should be observed when handling hydrochloric acid and hydrogen peroxide? ___
Explanation / Answer
7)Particles can only react when they collide. If you heat a substance, the particles move faster and so collide more frequently. That will speed up the rate of reaction. That seems a fairly straightforward explanation until you look at the numbers, It turns out that the frequency of two-particle collisions in gases is proportional to the square root of the kelvin temperature. If you increase the temperature from 293 K to 303 K (20°C to 30°C), you will increase the collision frequency by a factor of: 303/293 = 1.017
That's an increase of 1.7% for a 10° rise. The rate of reaction will probably have doubled for that increase in temperature - in other words, an increase of about 100%. The effect of increasing collision frequency on the rate of the reaction is very minor.
8) Wear a chemical-resistant apron, chemical-resistant gloves and chemical splash goggles at all times when handling HCl to protect your eyes and skin. Concentrated hydrochloric acid is toxic if inhaled, so avoid breathing it in and always handle it while under a fume hood.Use unbreakable bottle carriers or PVC-coated bottles when transporting HCl. Check for cracks on the acid bottle before picking it up or touching it. Look for spilled acid on the handle or on the table before touching the bottle. Small amounts of HCl can be flushed down the sink with large quantities of water.
hydrogen eroxide;
Eye Protection: Hydrogen peroxide and its decomposition products are not systematic poisons but contact with hydrogen peroxide can be irritating. Concentrated vapors cause discomfort in the mucous membranes and the eyes. Contact of the eyes with hydrogen peroxide is particularly dangerous because corneal burns can occur very rapidly. Therefore, safety glasses or, preferably, goggles should always be worn when handling concentrated hydrogen peroxide.
Protective Clothing:In addition to eye protection, rubber gloves and suitable protective clothing such as aprons or coveralls made of polyester acrylic fiber, polyvinyl chloride, polyethylene, or neoprene should be worn when handling concentrated hydrogen peroxide. Protective clothing, which lacks fire resistance, must be washed thoroughly with water should it come in contact with hydrogen peroxide. If allowed to dry in the fabric, the chemical may cause fire, particularly if the clothing is soiled.