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 errors in the experiment that might cause a change in the outcome of the chemical change, and name 3 ways to fix them.
Three sources of errors in the experiment that might cause a change in the outcome of the chemical change are:
1. Inaccurate measurement of the copper solution or steel wool: If the mass of the substances used is not measured correctly, it can lead to inaccurate results. To fix this, ensure that precise measuring instruments like a digital balance are used and measurement procedures are followed accurately.
2. Contamination of the reactants: If there is contamination or impurities in the copper solution or steel wool, it may affect the reaction and the observed changes. To prevent this, make sure that the chemicals used are of high purity, and clean the experimental setup thoroughly before conducting the experiment.
3. Evaporation or loss of reactants: During the transfer of the reactants, evaporation or spillage may occur, leading to a loss of mass and affecting the outcome of the chemical change. To avoid this, handle the chemicals and equipment carefully, ensuring that the reactants are not lost during the transfer process.
Three ways to fix these errors are:
1. Use appropriate measuring instruments and techniques: Ensure that accurate measuring instruments, such as a digital balance or a graduated cylinder, are used to measure the mass or volume of the substances involved. Follow the measurement procedures carefully, taking multiple measurements if necessary, to reduce errors.
2. Maintain cleanliness and use pure chemicals: Clean the experimental setup thoroughly before conducting the experiment to prevent any contamination that could alter the reaction outcome. Additionally, use chemicals of high purity to minimize the chances of impurities affecting the results.
3. Minimize reactant loss: Handle the reactants and equipment with care during the experiment to prevent evaporation or spillage. Use appropriate containers, lids, or stoppers to securely hold the reactants and minimize the chances of any loss occurring. It may also be helpful to work in a controlled environment with good ventilation to avoid any unexpected movement or loss of the reactants.