Rates of Reaction

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By: nadiamadzan (55 month(s) ago)

the video in slide 26 can't be viewed is it? anyways great pppt

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Rates of Reaction : 

Rates of Reaction 1 M.BREGAR (DANTE C.S.S.)

Reaction Rate : 

Reaction Rate The reaction rate is the speed of at which a reaction takes place. It is “how quickly” a product is made in a chemical reaction Example Mg + Cl2  MgCl2 REACTANTS PRODUCTS 2 M.BREGAR (DANTE C.S.S.)

DEMO: Rate of Reaction : 

DEMO: Rate of Reaction 3 M.BREGAR (DANTE C.S.S.)

COLLISION THEORY : 

COLLISION THEORY 4 M.BREGAR (DANTE C.S.S.)

Collision Theory : 

Collision Theory Reactions take place when reactants bump to make products 5 M.BREGAR (DANTE C.S.S.)

Slide 6: 

6 M.BREGAR (DANTE C.S.S.)

Reaction Rate : 

Reaction Rate Mg + Cl2  MgCl2 7 M.BREGAR (DANTE C.S.S.)

Collision Theory : 

Collision Theory Reaction Rate: is how quickly you create a new substance in a chemical reaction Faster reactions, have more collisions Slower reactions, have less collisions 8 M.BREGAR (DANTE C.S.S.)

Collision Theory : 

Collision Theory “Reaction Rate” can be changed by: Temperature Changing the concentration (number of molecules) Size of molecules / Changing the surface area 9 M.BREGAR (DANTE C.S.S.)

Factors Controlling Reaction Rate : 

Factors Controlling Reaction Rate 10 M.BREGAR (DANTE C.S.S.)

(1) Changing Temperature : 

(1) Changing Temperature Increasing temperature increases speed of molecules 11 M.BREGAR (DANTE C.S.S.)

(1) Changing Temperature : 

(1) Changing Temperature 12 M.BREGAR (DANTE C.S.S.)

(1) Changing Temperature : 

(1) Changing Temperature Increased temperature = faster chemical reaction, because there are MORE COLLISIONS 13 M.BREGAR (DANTE C.S.S.)

(1) Changing Temperature : 

(1) Changing Temperature 14 M.BREGAR (DANTE C.S.S.)

(2) Changing Surface Area : 

(2) Changing Surface Area Increasing “surface area” of molecules increases number of collisions . More collisions means “rate of reaction” is faster 15 M.BREGAR (DANTE C.S.S.)

(2) Changing Surface Area : 

(2) Changing Surface Area Perimeter of the large chip is 12 units Perimeter of small chips is 4, but there 9 small chips for total perimeter of 36 (9 x 4) 16 M.BREGAR (DANTE C.S.S.)

(2) Changing Surface Area : 

(2) Changing Surface Area MAGENSIUM POWDER MAGENSIUM RIBBON 17 M.BREGAR (DANTE C.S.S.)

(2) Changing Surface Area : 

(2) Changing Surface Area 18 M.BREGAR (DANTE C.S.S.)

(2) Changing Surface Area : 

(2) Changing Surface Area 19 M.BREGAR (DANTE C.S.S.)

(3) Changing Concentration : 

(3) Changing Concentration What is concentration? The amount of particles in a liquid . Example – a strong acid would contain more acid particles than a weak acid. STRONG ACID WEAK ACID 20 M.BREGAR (DANTE C.S.S.)

(3) Changing Concentration : 

(3) Changing Concentration 21 M.BREGAR (DANTE C.S.S.)

(3) Changing Concentration : 

(3) Changing Concentration Increasing the concentration, increases reaction rate. Why? Increase in concentration = more molecules This results in more collisions between molecules and an increase in reaction rate. 22 M.BREGAR (DANTE C.S.S.)

(3) Changing Concentration : 

(3) Changing Concentration 23 M.BREGAR (DANTE C.S.S.)

Catalysts : 

Catalysts 24 M.BREGAR (DANTE C.S.S.)

Catalysts : 

Catalysts These are “special molecules” which increase the reaction rate of a chemical reaction. Key: the catalysts are not used up in the reaction, but are actually reused. 25 M.BREGAR (DANTE C.S.S.)

Catalysts : 

Catalysts 26 M.BREGAR (DANTE C.S.S.)