https://padlet.com/john_gao_jiahao/ua2d764mdhei Made with cancer en-us 2017-03-30 04:06:51 UTC 2017-03-30 04:26:52 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Pizza.png john_gao_jiahao https://padlet.com/john_gao_jiahao/ua2d764mdhei/wish/163596492 If you want to measure speed of reaction, it is always measured against time, there are different ways that you can measure against time

1. Change in temperature against time
If the reaction is exothermic or endothermic, you can use the method above.

2. Formation of precipitate against time.
If the reaction involves precipitates, you can measure how fast the precipitate is formed.

3. Change in color against time.
If  the reacting chemicals are a different color to the reaction products, you can use the method above.

4. Change in PH against time.
If the reaction involves an acid being neutralized by an alkali, you can use the method above.

5. Change in volume or pressure against time.
If the reaction produces a gas as one of the reaction product, you can use the method above.

6. Change in mass against time.
If the reaction has gas escaping, then the change in mass could be measured against time

 ]]> 2017-03-30 04:10:17 UTC https://padlet.com/john_gao_jiahao/ua2d764mdhei/wish/163596492 teo_ming_rui_xa https://padlet.com/john_gao_jiahao/ua2d764mdhei/wish/163596554 What actually happens during a chemical reaction?
During a chemical reaction...]]> 2017-03-30 04:11:10 UTC https://padlet.com/john_gao_jiahao/ua2d764mdhei/wish/163596554 wee_wei_san_justin https://padlet.com/john_gao_jiahao/ua2d764mdhei/wish/163596665 1. Temperature
Increasing temperature will increase rate of reaction.
Increasing the temperature of a reaction mixture increases the kinetic energy of the particles in the mixture.  
The particles collide and each collision is more energetic increasing the frequency of the collisions between the frequency of collisions between particle.

2. Concentration
Increasing the concentration of a solution will increase the rate of reaction. This increases the frequency of which the particles collide and will therefore increase the rate of reaction.

3. Pressure (of a gas) 
Increasing the pressure reduces the distance between particles and will allow particles to collide more frequently, therefore increasing the rate of reaction.

4. Surface area (of a solid)
Increasing the surface area will increase the amount of surfaces that the reagents can collide into with, therefore increasing the rate of reaction.

5.Catalyst
Addition of the catalyst decreases the activation energy required to start a reaction, which allows the reactions to happen faster, therefore increasing the rate of reaction]]> 2017-03-30 04:12:56 UTC https://padlet.com/john_gao_jiahao/ua2d764mdhei/wish/163596665 teo_ming_rui_xa https://padlet.com/john_gao_jiahao/ua2d764mdhei/wish/163596718 Because of their random movement...]]> 2017-03-30 04:13:36 UTC https://padlet.com/john_gao_jiahao/ua2d764mdhei/wish/163596718 teo_ming_rui_xa https://padlet.com/john_gao_jiahao/ua2d764mdhei/wish/163596799 This is the molecules coming into contact with one another...]]> 2017-03-30 04:15:16 UTC https://padlet.com/john_gao_jiahao/ua2d764mdhei/wish/163596799 teo_ming_rui_xa https://padlet.com/john_gao_jiahao/ua2d764mdhei/wish/163596912 The reacting chemicals must collide with the correct orientation (meaning the right way round) and with sufficient energy, equal to or greater than the reaction's activation energy for the...]]> 2017-03-30 04:17:04 UTC https://padlet.com/john_gao_jiahao/ua2d764mdhei/wish/163596912 teo_ming_rui_xa https://padlet.com/john_gao_jiahao/ua2d764mdhei/wish/163597071 If the energy of the collision exceeds the required activation energy, chemical bonds of the 2 molecules break.]]> 2017-03-30 04:19:52 UTC https://padlet.com/john_gao_jiahao/ua2d764mdhei/wish/163597071 teo_ming_rui_xa https://padlet.com/john_gao_jiahao/ua2d764mdhei/wish/163597164 Which results in the formation of the new reaction products]]> 2017-03-30 04:22:07 UTC https://padlet.com/john_gao_jiahao/ua2d764mdhei/wish/163597164