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 possible sources of errors in the experiment that could impact the outcome of the chemical change are as follows:
1. Inaccurate measurement of the copper solution or steel wool: If the mass of the copper solution or steel wool was not measured correctly, it could introduce a significant error into the experiment. To fix this, ensure that proper measuring instruments, such as graduated cylinders and balances, are used and measurements are taken with precision.
2. Contamination of the steel wool or copper solution: Any impurities or foreign substances present in the steel wool or copper solution could interfere with the chemical change, leading to inaccurate results. To prevent this, ensure that the steel wool and copper solution are properly cleaned or purified before the experiment.
3. Incomplete reaction: If the reaction between the steel wool and copper solution was not allowed to proceed fully, it could affect the observed changes in mass and the appearance of gas production. To address this, ensure that sufficient time is given for the reaction to complete, and all components are mixed thoroughly to enhance the reactant contact.
To summarize, the three ways to fix these sources of errors are:
1. Use accurate measuring instruments to obtain precise measurements of the copper solution and steel wool.
2. Ensure that the steel wool and copper solution are free from contaminants or impurities before conducting the experiment.
3. Allow sufficient time for the reaction to occur completely and ensure thorough mixing of the components to enhance reaction efficiency.