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The substance may be poisonous.
poisonous chemicals may go into your eye
It depends on what the chemicals are and the experiment itself. Also, it's not clear if you're asking about what the reagents are held in for storage prior to the experiment, what they are held in temporarily during the course of the experiment but before they are actually combined, or what they are held in when they are in the process of being combined.
The observations and measurements recorded during an experiment are called data. It is important to keep accurate data in order to understand the results of the experiment.
Because it is pointless doing an experiment if you are not going to be exact !
tongue
Because it is pointless doing an experiment if you are not going to be exact !
Observation is important in science because it allows for recordings during an experiment. It also is used as support for hypotheses.
becuase because
Clutter leads to accidents, and accidents can ruin the experiment.
The independent variable changes during an experiment.
so the solution will not be contaminated or changed during the reaction