Question

@dan815

Answer 1

The rate of a reaction can be observed by measuring the change in the amount of a reactant over time, as given in the graph below. How does the rate of a reaction change with time and how does the collision theory explain this change?
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Answer 2

okay the concentration is getting less as time is increasing, and the reason this decrease in concentration is the same as the decrease in reactions is because there are less molecules to keep bumping into each other. As concentration of the substance is decreasing, meaning that the ammount of that substance present in some area just got smaller, so less of them occupy one area, so they have more room to move around and less collisions, ie less chances for electrons and elements and compounds to be exchanged between the. You would need more activation energy and give them more potential to allow them to react over larger distances.

Answer 3

can you dumb that down? or just condense?

Answer 4

you're the man DAN

Answer 5

Emi -.- you can just write the stuff you understand from that. I just rambled on a bit.

Answer 6

okay lol

Answer 7

i would fan you but youy know

Answer 8

I am not completely sure what collision theory states though, we should look it up

Answer 9

i got you

Answer 10

Collision theory is a theory proposed independently by [1] Max Trautz in 1916 and William Lewis in 1918, that qualitatively explains how chemical reactions occur and why reaction rates differ for different reactions.[2] The collision theory states that when suitable particles of the reactant hit each other, only a certain percentage of the collisions cause any noticeable or significant chemical change; these successful changes are called successful collisions. The successful collisions have enough energy, also known as activation energy, at the moment of impact to break the preexisting bonds and form all new bonds. This results in the products of the reaction. Increasing the concentration of the reactant particles or raising the temperature, thus bringing about more collisions and therefore many more successful collisions, increases the rate of reaction.

When a catalyst is involved in the collision between the reactant molecules, less energy is required for the chemical change to take place, and hence more collisions have sufficient energy for reaction to occur. The reaction rate therefore increases.

Collision theory is closely related to chemical kinetics.

Answer 11

copy and paste much??? lol just kidding dan.......

Answer 12

yeah lol xD

Answer 13

but its good, I cant be more clear that wikipedia

Answer 14

wikipeida XDXDXDXD

Answer 15

whaatt is your teacher against wikipedia =.=

Answer 16

Over time the concentration will decrease this is due to less molecules in the reaction. When the concentration is decreased there are less things being exchanged between each other. So you in the end have to acquire more activation energy in order to react. Collision theory : states that collisions cause the noticeable chemical changes. When you introduce a catalyst then the catalyst will cause for less activation energy in the reaction.

Answer 17

@dan815 i need small question............... :)

Answer 18

31.5 grams of an unknown substance is heated to 102.4 degrees Celsius and then placed into a calorimeter containing 103.5 grams of water at 24.5 degrees Celsius. If the final temperature reached in the calorimeter is 32.5 degrees Celsius, what is the specific heat of the unknown substance?

This is the problem I can do it i just dont know hot to find the total initial temperature. How to calculate it after the substance is placed in the water how much it cools.

Answer 19

DAN