Science Essays

1. Objective 1. To study the effects of the normal reaction and surface area on the force of friction using a block. 2. To estimate and compare the coefficients of static and kinetic friction of different materials. 2. Apparatus * Wooden block (190.0 g) 3 * Elastic strings * Wooden …

Aim The target of this investigation is to find out how the force you exert on pulling back a rubber band, which will in turn catapult an empty margarine tub, affect the distance which the margarine tub will travel. We will not be changing any of the other factors of …

When supplied with a organic unknown there are many ways of determining its identity and it is important to use as much information as can be gained to work out the identity of an unknown as many are very similar in physical properties, chemical properties and/or chemical make up. In …

Aim: To investigate the relationship between the time taken for diffusion and cell dimension. Procedure: 1. Place the gelatin block on a tile or Petri dish and use a scalpel or razor blade to cut it in half, producing two cubes of 10mm sides 2. Keep on of these cubes …

To determine the enthalpy change of a displacement reaction (Between zinc and copper (II) ions) 5. Introduction : Excess zinc powder is added in a measured amount of aqueous copper (II) sulphate. The temperature change is then measured over a period of time so the enthalpy of this reaction can …

At the start of the year’s University Physics 1 degree course, the Physics Professor looked at the motley crew filling the lecture theatre. He knew some students were destined to survive, while others would drop-out. In a rather callous way, the professor wrote-off the previous twelve years of the students’ …

Part One Method: We switched on the laptop and connected the web cam into the USB. Once this was done we made sure that the web cam was working correctly and as soon as this watched checked we began to set up the practical part of the experiment. We then …

Introduction: Casein is a globular colloidal protein. Globular proteins are hydrophobic proteins which in certain external condition are soluble in eater. The ph at which the protein is electrically neutral is known as the isoelectric point. A globular protein such as a casein becomes increasingly insoluble as it approaches its …

Chemicals: 0.3 M methanal about 100 cm3 solution B (containing 0.20 M NaHSO3 and 0.05 M Na2SO3) about 100 cm3 phenolphthalein indicator several dropping bottles shared Apparatus: Boiling tube x 6 100 cm3 beaker x 2 Glass rod x 1 250 cm3 beaker x 1 stop watch x 1 600 …

Objective To determine the enthalpy change of the hydration of magnesium sulphate (MgSO4) using Hess’s law. Procedures 1. The mass of a clean and dry polystyrene foam cup was weighed and recorded. 2. 50.0 cm3 of de-ionized water was measured by using a measuring cylinder 3. The 50.0 cm3 of …