chemistry

Question 1

what is a chemical reaction

Answer 1

when a new suubstance is formed;
change of colour
gas given off
a new solid forms
energy change

Question 2

what does the reaction rate mean

Answer 2

describes the speed of a reaction,the faster the reaction, the higher the rate

Question 3

calculte the rate of a reaction if 10cm3 of gas is produced in 20 secs

Answer 3

rate=qauntity divided by time
rate=10 divided by 20=0.5cm3/s

Question 4

whats concentration

Answer 4

the concentration of a solution describes the amount of solute dissolved

Question 5

what is a catayst

Answer 5

is a substance that speeds up a chemical reaction without being used up

Question 6

in what way does a catalyst work

Answer 6

it reduces the energy requirments for the reaction making it faster and cheaperfor chemica industries

Question 7

what are enxymes made of

Answer 7

made from protein chains that are folded to form pockets called active sites

Question 8

what do enzymes do

Answer 8

enzymes usually break substances down or build them up

Question 9

what is denaturation

Answer 9

is caused by increasing/decreasing ph or temperature which causes the enzyme loose its shape which leads to the substance being unable to bind