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Chemical and physical change lab report copper sulfate
Methods of experimentation
Chemical and physical change lab report copper sulfate
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Volume's Effect on a Copper Sulphate Solution
We are trying to find out if the current though a copper sulphate
solutions volume is increased. To find this information out I shall
perform an experiment using the following equipment;
· 1 power pack
· 1 beaker
· 2 carbon rods for anode and cathode
· 1 ammeter
· 1 measuring cylinder
· 2 crocodile clip wirers
I shall also be using 60cm3 volume of copper sulphate in my
preliminary results to decide upon the concentration of copper
sulphate and the voltage I shall use. The following diagrams show the
step by step process in which I will do my experiment;
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I will take 10 readings from 10cm3 to 100cm3. I will repeat my
experiment to give my experiment a fair average. I will keep the power
pack the beaker the carbon rods the crocodile clips the ammeter the
concentration of copper sulphate and the measuring cylinder the same
each time I do the experiment this experiment. I intend to change the
volume of the copper sulphate I shall change this by going up 10cm3
each time. To keep my experiment safe I shall wear goggles and have a
bench wipe close by to mop up any spillages.
I predict that when the volume of copper sulphate is increased the
current going though it will also increase, and if the volume is
doubled the current should also be doubled. I believe my prediction to
be true and I will now try to prove this by using my scientific
knowledge and other resources.
An electrode is a component of an electric circuit that connects the
conventional wiring of the circuit to a conducting medium such as an
electrolyte or a gas. The electrically positive electrode is called
the anode and the negative electrode the cathode. If an anode and a
cathode are placed in a solution of an electrolyte and a source of
direct current is connected between them, the positive ions in the
the replicate shows the same trend as the first experiment. I used a measuring cylinder and a beaker to measure out the amounts of water; however these did not seem to affect the quality of my results. To increase the accuracy of my results I could have perhaps used a burette. Even though I did the best I could to keep the experiment accurate, I did. some places there were mistakes that unintentionally occurred.
- The area should be kept dry and taps should be switched off. Variables: I will only be changing the current by moving the variable resistor. I will repeat the experiment twice so that I can be sure of my readings and see if anything has changed or gone wrong. I will take 12 readings at 0.1 amps intervals. Apparatus: o Voltmeter o Ammeter o Variable resistor o 12 volt lamp o Battery pack (set at 12 volts ) o Leads Method: 1.
Investigating the Effect of Concentration on the Rate of Diffusion Aim: To find out if concentration affects the rate of diffusion. Prediction: I predict that the higher the concentration of acid the faster the reaction will be. Hypothesis: Diffusion is the spreading out of a gas or liquid from an area of low concentration to another area where it has a lower concentration until the overall concentrations are balanced. The Hydrochloric acid (HCl) diffuses into the gelatine cube of which contains Sodium Hydroxide (NaOH), which is an alkali. When the Hydrochloric acid combines with the Sodium Hydroxide they form salt and water, which is neutral therefore turning the pink cube to clear.
The Effect of Solute Concentration on the Rate of Osmosis Aim: To test and observe how the concentration gradient between a potato and water & sugar solution will affect the rate of osmosis. Introduction: Osmosis is defined as, diffusion, or net movement, of free water molecules from high to low concentration through a semi-permeable membrane. When a substance, such as sugar (which we will be using in the experiment we are about to analyse), dissolves in water, it attracts free water molecules to itself, and in doing so, stops them from moving freely. The effect of this, is that the concentration of (free) water molecules in that environment goes down. There are less free water molecules, and therefore less water molecules to pass across a semi-permeable membrane, through which sugar molecules and other molecules attached to them are too big to diffuse across with ease.
In my experiment, I will use an overall volume of 50 cm³ of 2moles of
3. Add on of the following volumes of distilled water to the test tube, as assigned by your teacher: 10.0mL, 15.0mL, 20.0mL, 25.0mL, 30.0mL. (If you use a graduated cylinder, remember to read the volume from the bottom of the water meniscus. You can make more a more accurate volume measurement using either a pipette or a burette.)
Metals contain a sea of electrons (which are negatively charged) and which flow throughout the metal. This is what allows electric current to flow so well in all metals. An electrode is a component of an electric circuit that connects the wiring of the circuit to a gas or electrolyte. A compound that conducts in a solution is called an electrolyte. The electrically positive electrode is called the anode and the negative electrode the cathode.
1.) Gas Syringe 100cm³ - I chose this as it is easy to measure the
The Enzyme Concentration and The Volume of Juice As the enzyme concentration increases so too does the volume of juice. This is because as the concentration of enzyme molecules increase there is more chance of a collision with an apple substrate molecule. If the chance of a collision is increased then the number of collisions will increase resulting in a higher rate of reaction. The enzyme combines with the substrate to form an enzyme-substrate complex.
Osmosis in Potato Tubes Osmosis: Osmosis is the movement of water molecules through a semi-permeable membrane from a high concentration to a low concentration. Diagram: [IMAGE] [IMAGE] Aim: To see the effects of different concentration of sugar solution on Osmosis in potato tubes. Key factor: In the investigation we change the sugar solution from: 0%-10%-20%-30%-40%-50% this is the independent variable; the dependant variable is the change in mass. Prediction: I predict that all the potato tubes in pure water or low concentration sugar solution will swell because water enters their cells by osmosis.
Copper wire, bare, 24-gauge, 9 V battery, 9 V battery clip, and more. I am going test each liquid to see which liquid has more electrolytes, and by knowing that it will help me find out which is better for you. I believe by doing this experiment it will help me see if my hypothesis is right or
To investigate the temperature change in a displacement reaction between Copper Sulphate Solution and Zinc Powder
In the experiment there are several possible ways of changing the electric current such as changing the voltage or the position of the electrodes within the electrolysis cell. However, it was found from preliminary work that the most effective way to change the current was to change the concentration of the acid solution. The preliminary work showed that the greater the concentration of the acid, the greater the current. Ohm's law states that R(resistance) =
of Copper Sulphate. To do this I plan to work out the amount of water
Firstly, we need to keep the chemical at a constant concentration. So, in this experiment we have chosen to keep hydrochloric acid at a constant concentration (5cm3). We could have, however, used Sodium Thiosulphate as a constant, but we had chosen to use Hydrochloric acid. Next, we must make sure that the solution is kept at a constant volume throughout the experiment. If the volume is different, then it could give different results if it was at a constant volume.