Chemistry SCIEP

Authors Avatar

        Page  of

S.C.I.E.P.

        My aim is to discover and investigate the relationship between the reactants and the rate of the chemical reaction.  Basically i will work out what affects the rate of reaction and why.  The reactants are marble chips and hydrochloric acid.  We can carry out this investigation in several ways; first we can use a gas syringe connected to a test tube via a rubber tube, containing the reactants.  This is shown in method 1.  We can also displace the carbon dioxide into a tray filled with water which is then trapped in an upside down tube.  See method 2.

Method 1

_____________________________________

Method 2

Factors

The rate of reaction between the marble chips and hydrochloric acid is affected by a number of variants such as temperature, concentration surface area and changing the quantity and air pressure.  

        To make this a reliable experiment the factors that could affect the experiment will be controlled and measured. A thermometer  will be used to so we can adjust the temperature accordingly.  We cannot easily control the size of the individual marble chips but we decided to use small marbles chips of similar size, instead of medium or large.  We will also restrict the weight of the marble chips to 2 grams to be as accurate as possible.  The concentration of the acid will always have a margin of difference because this is what we are investigating but we will use the same bottle of acid each time and also use 20cm3 quantities.  The pressure will also be the same because we will not change altitude when doing the experiment.

Theory

We will start with a 2molar (m is molar) HCL - this means 2m dissolved in 1 litre of water.

The equation for concentration is 20cm3 of 2m = 100% concentration.

15cm3 of 2m +5cm3 water= 15/20X100 = 75%

Hydrogen =1g

Chlorine =36.5g

Hcl 1m =36.5g

Hcl 2m =73g

This means 73g of Hcl was dissolved in 1 litre of water to make 2M solution.  We will be using a volume of 20cm3 and each time we will reduce the concentration by serial dilution.

Join now!

 This equation works out the concentration of the hydrochloric acid.

1M =1moler

My theory is that If I double concentration the rate doubles, 4moler is half the time of 2moler solution.

        My theory is that the higher the concentration the more molecules that can react are able too because there is a higher percentage of them, so the quicker the reaction, this is also known as the collision theory.

Strategy

        The purpose of our investigation is to find a link between what affects the amount of gas and the time it takes to reach that amount.  We will ...

This is a preview of the whole essay

Here's what a teacher thought of this essay

Avatar

This report describes two good ways of measuring the rate of a reaction. It collects reliable results and draws good graphs. It is, however, written very poorly, with lots of grammatical as well as technical errors. Overall, this piece of work is 3 stars out of 5