Investigating How Changing Variables in an Experiment Affects the Rate of Reaction
The title of my investigation is FIZZY CHIPS. I will be investigating
how changing variables in an experiment effects the rate of reaction.
I will do this by observing a reaction between marble chips and
hydrochloric acid. There are many variables, which will affect this
experiment. The variable I will be changing is the amount of chips. To
make this a fair test I must keep the other variables the same right
thought the experiment.
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Variable
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Concentration of acid
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Size of chips
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Temperature of experiment
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Container
How I will keep it constant throughout the test
Use acid from the same container and if I use another container check
that it is of the same concentration (?molar)
In my experiment I have a choice of small or large chips.
Alternatively I could crush some chips making them smaller. Once I
have decided what size chips I I'm going to use I will keep the same
size throughout
To keep the same temperature levels in my experiment I will make sure
that I conduct my test in the same place each time and that I avoid
direct sunlight or drafts around my experiment.
If I was to change the container this would have effects on how the
particles were moving and colliding. For this reason I will conduct
all my tests in the same sort of flask
Text Box: Prediction I predict that as I increase the amount of chips the rate of reaction will increase because as the nuber of chips increases so does the surface area. Collision theory tells us that if the surface area of one of the reactants is increased then the reaction will speed up. This is because the acid particles have greater surface area to react with. This in turn means more carbon dioxide is produced.
Preliminary Results
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Before I decided on a method I carried out some preliminary
Investigating Rates of Reactions My aim is to investigate what factors affect the rate of reaction between magnesium and hydrochloric acid. The factor that I will be focusing on is the concentration of Hydrochloric acid. [IMAGE]Reaction Equation: Mg (s) +2HCl (aq) = MgCl2 (aq) +H2 (g)
and it is necessary for the back of the gas syringe to be taken out,
Repeated testing may lead to better or worse performance. Changes in performance on the test may be due to prior experience with the test and not to the independent variable. In addition, repeated testing fatigues the subjects, and their performance declines as a result (Jackson, 2012). Because the professor is interested in determining if the implementation of weekly quizzes would improve test scores, an experimenter and/or an instrumentation effect may also affect results. In a single group post-test only design, possible confounds include the lack of a comparison group and the absence of an equivalent control group.
The reason I believe this is that chemical reactions occur when particles of the reacting substances collide. Increasing the number of the particles increases the number of collisions per second and this increases the reaction rate. In the reaction between hydrochloric acid and calcium carbonate you can increase the number of particles in two ways. The first of these is to increase the surface area of the calcium carbonate.
To make sure that my test is fair I will make sure to keep all the
will result in an increase in the speed of the rate of reaction it has
who administers a series of test that must be passed, which points out normal or abnormal
The number and strength of collisions is increased so that the reaction can happen faster than it should. If the particles have more energy then more particles will be able to react to it. Solid reactants like marble chips are affected by surface area. The larger the surface area, the more collisions that will take place.
On a two pieces of paper, we drew a cross and place a beaker on top of
In a substance the rate of reaction will be quicker if it has a large
Chemical kinetics is the study and examination of chemical reactions regarding re-arrangement of atoms, reaction rates, effect of various variables, and more. Chemical reaction rates, are the rates of change in amounts or concentrations of either products or reactants. Concentration of solutions, surface area, catalysts, temperature and the nature of reactants are all factors that can influence a rate of reaction. Increasing the concentration of a solution allows the rate of reaction to increase because highly concentrated solutions have more molecules and as a result the molecules collide faster. Surface area also affects a
An investigation into how changing one variable influences the rate of reaction between marble chips and dilute Hydrochloric acid
The aim or purpose of this investigation is to explain how concentration affects the rate of reaction (the decomposition of sodium thiosulphate in reaction with hydrochloric).
There are five factors which affect the rate of a reaction, according to the collision theory of reacting particles: temperature, concentration (of solution), pressure (in gases), surface area (of solid reactants), and catalysts. I have chosen to investigate the effect of concentration on the rate of reaction. This is because it is the most practical way to investigate. Dealing with temperatures is a difficult task, especially when we have to keep constant high temperatures. Secondly, the rate equation and the constant k changes when the temperature of the reaction changes.
The rate of reaction is how quickly or slowly reactants in chemical reactants turn into products. A low reaction rate is when the reaction takes a long time to take place; hence, a reaction that occurs quickly has a high reaction rate. A rate refers to how slow or quick the product is produced. It is possible to control the rate of chemical reactions and speed up or slow down the rate of chemical reactions by altering three main factors which are temperature, concentration and the surface area. When the temperature of the reactants increases, the molecules vibrate at a more intense speed therefore colliding with each other more frequently and with increased energy resulting in a greater rate of reaction. Accordingly, as the temperature decreases the molecules will move slower, colliding less frequently and with decreased energy resulting in the rate of reaction decreasing. Concentration is how much solute is dissolved into a solution and is also a factor that affects the rate of reaction. When the concentration is greater this means there is an increased amount of reactant atoms and molecules resulting in a higher chance that collisions between molecules will occur. A higher collision rate means a higher reaction rate. Consequently at lower concentrations there are reduced chances of the molecules colliding resulting in a lower reaction rate. The measurement of how much an area of a solid is exposed is called the surface area. The quicker a reaction will occur the more finely divided the solid is. For example, a powdered solid will usually have a greater rate of reaction in comparison to a solid lump that contains the same mass for it has a lower surface area than the powdered solid.