Note: calculation of average rate of reaction should be represented as a positive value representing 'speed' of reaction. Many will argue that speed, or rate can be negative (-), but speed is a scalar quantity that represents change of position over a period of time. Acceleration can be negative (~deceleration) but speed is absolute. For example, if one is moving at a speed of 30mi/hr then its is 30mph or it is not 30mph, but can not be a negative in the context of rate. If you bring this up, you will be challenged. Good Luck :-)
Because a single computer can store more data than many journals put together. Computers have a large memory. Not only can scientific data be stored but it can be retrieved easily.
Particle Charge Proton +1 Neutron. 0 Electron. -1 Chemical properties of elements are primarily determined by the electrons/protons but not by the neutrons. Therefore, the Isotopes of the same element have similar chemical behaviour.