Chemistry Igcse

In reference to the collision theory, molecules act as small spheres that collide and bounce off each other, transferring energy among themselves when the collide. In order for a reaction to occur, there must be collisions between molecules. Through experimentation, factors are discovered that influence the reaction rates of chemical reactions include the concentration of reactants, temperature, surface area, the physical state of reactants, and a catalyst. This experiment regarding the factors that affect reaction rate tests the effects of increased concentration and

There are many substances that can be manipulated and cause the rate of reaction in fermentation to either speed up or slow down. Substances that alter the rate of the reaction could be temperature of the water, the yeast concentration, pH, and the glucose concentration. In the experimental group of the experiment the amount of yeast concentration was manipulated. The objective of this experiment was to determine what factors affect the rate of the fermentation. To test this objective we changed the amount of yeast being used. A higher yeast concentration replaced the controlled yeast amount. A prediction made by my group was that higher amount of yeast would speed up the process of fermentation. Our null hypothesis is there will be no

Statement of Inquiry: What is the effect of changing a factor on the rate of chemical reaction?

Three factors that can affect the rate of reaction are temperature, pH and the salinity.

11. The experiment was repeated three more times using different water temperatures (room temp water, cold temp water, hot temp water).

These layers can be separated through the use of a seperatory funnel which drains the bottom layer into a separate container. This method uses the understanding of partition ratios of solutes to different paired solvents to produce an equilibrium leaning towards one solvent over another, thereby extracting a compound from one liquid to the other (Padias 128-37). For example, consider a mixture containing two solutes, solute A and solute B, and two immiscible solvents, solvent A and solvent B. If solute A dissolves well into solvent A, but not very well into solvent B, and solute B dissolves well into solvent B but not very well into solvent A, there would be a higher ratio of solute A in solvent A than in solvent B, and a higher ratio of solute B into solvent B than in solvent A. One can then see that, through the use of different solvents, two dissolved solutes can be separated from a mixture. This ratio of a solute concentration to different solvents is defined by K, the distribution constant. Successive filtrations yield’s a higher percentage of products.

In this experiment you will observe some physical and some chemical changes. You will observe that energy must be used to start some chemical reactions, and that it is produced in others.

This image explains that the higher the temperature, the concentration, and the pressure the faster the rate of the reaction is.

1. Place a small amount of wax from a birthday candle into a test tube. Heat gently over a burner flame until the wax melts completely; then allow

The reaction time (in seconds) is the dependent variable of this experiment. This will be changed by the temperature of the chemicals, and as it is affected by the independent variable it is considered the dependent variable.

The scientist’s topic reveals around temperature. The scientist trying to figure out which temperature has the fastest reaction time. The independent variable for this experiment is the different temperatures being used, the dependent variable is the reaction time for the Alka-Seltzer tablets.

Vacuum filtration is the method of separating a solid product from a liquid or solution mixture. The mixture is poured through a Buchner funnel containing filter paper. The filter paper holds the solid particles and the liquid draws through the funnel into the flask below.

Module Nine: Lab Questions Your first lab link can be found at Forensic Drug Chemistry. 1. Why is chemical analysis used in forensic science? It's use so on any cases the evidence that was submitted at the lab that it was detected and we can help find out the types of illegal drugs, and helped the law enforcements officers or others stop offenders.

c) Write the chemical equation that describes a nitroglycerine explosion. Why is this reaction explosive?

Faster Rate Of Reaction