we did a lab on chemical change, where we had to see how a chemical change affcts mass. so we measure the mass of 20ml of copper solution, and 2cm(cubed) of steel wool, and then we mixed them into a flask. soon the steel wool turned rusy, and broke apart. and the duofilm(which is a strtchy rubery lid) popped up as tho gas was produced.
then we had to answer some questions:here is the question i need help with.
sometimes in an experiment there are flaws due to lack of design and materials, therefore causing mistakes. what are 3 sources of air flaws and name 3 ways to fix them.
You need to be somewhat more specific about your experiment. There IS no gas produced, or at last there should not be, when steel wool (iron) and copper(II) solution are mixed. The rusty color you see is due to the iron going in to solution (forming iron(II) ions) while copper plates out. The copper is what you see that looks like rust. No gas in that reaction. Was the solution acid? An acid solution would produce gas. Did you test for the kind of gas? Did you weigh the resulting material and compare that with the original mass of the reactants? What conclusions did you draw concerning the changes in the chemical mass?
yah we weighed the resulting material and it turned out to weigh more than the starting material
I can help with some things that might have caused the experiment to fail to prove that mass can't be created nor destroyed. For one thing, how accurately did you measure the steel wool. If you took 3 cc of it steel wool, how tightly was that "wrapped" when it was measured. Stell wool, as you know, is quite flexible and there probably were air holes in it. That is, you may have measured a lot of space when measuring the steel wool. How accurately did you measure the 20 mL copper(II) solution. On a triple beam balance or better than that. You don't say how far the experiment was off (that is you don't say how much mass appeared to be created). Did you check for heat in the vessel? Could that have been heat that caused the durofilm to expand. I hope this helps you get started.
When conducting experiments, it is common to encounter flaws or sources of error that can affect the results. In the case of your chemical change lab, it seems like the question is asking about potential sources of error related to air, and how they can be addressed. Here are three possible sources of air flaws and three ways to fix them:
1. Contamination from ambient air: Airborne particles and gases from the surrounding environment can mix with the substances in your experiment, leading to inaccurate results. To address this, you can use airtight containers or storage to prevent exposure to air during the experiment. Additionally, conducting the experiment in a controlled environment, such as a fume hood or glove box, can minimize contamination.
2. Incomplete sealing of equipment: If the containers or apparatus used in the experiment are not properly sealed, air may enter or escape, leading to errors in the observations and measurements. To fix this, make sure all seals, lids, stoppers, or closures are secure and airtight. Check for leaks or gaps in the equipment before starting the experiment.
3. Variation in atmospheric pressure and temperature: Changes in atmospheric pressure and temperature can influence the behavior of gases involved in the experiment, affecting the overall outcome. To minimize this source of error, you can conduct the experiment within a controlled environment where temperature and pressure can be regulated and kept constant. Alternatively, you can measure and record the atmospheric conditions during the experiment, and then adjust the data accordingly using appropriate mathematical corrections.
Remember, each experiment may have its own unique sources of error and methods for addressing them. It is essential to evaluate and identify potential sources of flaws to improve the accuracy and reliability of your results.