Also, it has a narrow top and so it is safer. My conclusion is justifiable because I have backed it up with points from my data and I have proved all the points that I made. The particle theory says that for a chemical reaction to occur, there must be a collision at a certain velocity and at a certain angle.
The timer was stopped when in see the black cross through the cloudy solution could no longer. It is shown on my graph.
I could test this by asking one of my peers to follow the instructions and then asking for their feedback. I had to make sure that my classmates were safe as well as myself. This is very important because loose hair can not only get dipped into chemicals but can also obscure vision.I will discuss these further in my evaluation. When you have decided on the method, give a detailed description of how you might carry it out. This shows that there is a difference in the data which proves accuracy. My data was precise because most of the points on my graphs are close to the line and are all close by each other. In the case of the sodium thiosulphate - acid reaction, you can leave the thermometer in the flask and take the temperature at the end, then use an average for the temperature of the reaction. The rate of reaction is the speed of a reaction. The state symbol for sulphur dioxide is aq not g because it is dissolved in water as its original state would be too toxic and corrosive for me to use safely. It is quite difficult to judge properly the exact moment that the cross disappears - the human eye is just not strong enough.
This causes them to move around more. A clearly labelled diagram of the method with a brief outline of how you intend to carry out the experiments - this cuts down on the writing and makes the scene clear!
An input of heat energy is required to start some reactions.