C6 Rates of reaction.

Question 1

what is a rate of reaction

Answer 1

how quickly the reactants form into the products

Question 2

give an example of a slow reaction

Answer 2

iron rusting

Question 3

give an example of a moderate reaction

Answer 3

magnesium reacting with acid

Question 4

give an example of a fast reaction

Answer 4

burning

Question 5

how does a reaction occur

Answer 5

particles colliding with high energy

Question 6

what is activation energy

Answer 6

the minimum amount of energy required for a reaction to happen

Question 7

Four variables that effect rate of reaction

Answer 7

temperature, pressure, surface area, catalyst

Question 8

equation for rate of reaction

Answer 8

rate of reaction= mass of product/time taken

Question 9

How do you record rate of reaction using colour change

Answer 9

in a transparent solution, you put your reactant in, and records the
time taken for it to cause a change in colour or disappear

Question 10

how do you record rate of reaction using change in mass

Answer 10

you put the mixture on a balance and record, at intervals, the amount
of gas given of by the reduction in mass”

Question 11

how do you record rate of reaction using volume of gas given off

Answer 11

you use a gas syringe to record the amount of gas given off

Question 12

what do magnesium and hcl react to create

Answer 12

H2

Question 13

describe the practical involving the reaction of magnesium and HCL

Answer 13

“HCL solution into a conical flask and onto a balance. add magnesium
along and then plug it with cotton wool. take readings of the mass at
regular intervals

Question 14

how do you find the mean rate of a reaction using a graph

Answer 14

ychange/xchange

Question 15

using a graph, how do you find a reaction rate at a specific point in the graph

Answer 15

draw a tangent and then do y change/ x change

Question 16

in what system only, can an equilibrium occur

Answer 16

a closed system

Question 17

describe an equilibrium

Answer 17

forward and backward reactions occur at exactly the same rate, in a closed system which causes the products and reactants to maintain the same concentrations.

Question 18

What is le chatelier’s principle

Answer 18

that an equilibrium will counteract any changes made to it

Question 19

using le chatelier’s principle, what will happen if an equilbrium gains heat

Answer 19

it will begin to give of heat

Question 20

what does sodium thiosulfate and HCL react to produce

Answer 20

A sulfur precipitate

Question 21

how would you investigate the effects of different concentrations of HCl/
sodium thiosulfate on the rate of reaction.

Answer 21

Add a set volume of sodium TS to a conical flask. place a black cross underneath it
and add some dilute HCL. Time how long it takes for black cross to disappear. repeat
for different concentrations of HCL/sodium thiosulfate to show how concentration
effects the rate of reaction.

Question 22

what effect will a higher concentration HCl have in the sulfur experiment

Answer 22

It will increase the rate of reaction

Question 23

why does higher pressure mean a faser rate of reaction

Answer 23

particles move faster. More collisions. this creates more energy for reaction to happen

Question 24

What is the main cause of a faster rate of reaction

Answer 24

More collisions between particles

Question 25

when answering a question on how the RoR increases, always explain how….

Answer 25

More collisions have occured

Question 26

How does a catalyst increase the rate of reaction

Answer 26

speeds up the reaction without actually being used itself. decreases the activation energy