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indicator
is a substance that changes it color according to it medium
molarity
A concentration unit (M); defined as the number of moles of solute divided by liters of solution.
contact lenses are not permitted in the laboratory
certain chemical vapors may cause eye irritation when contact lenses are worn
never add boiling chips to a hot solution
adding boiling chips to a hot solution may cause it to boil over rapidly
when heating liquids in a test tube , hold the test tube with a test tube clamp at an ___ over the flame .
45 degree angle
never heat a liquid in a test tube with the test tube opened end pointed toward another person.
inhaling the vapors and gases resulting from the heating may affect the person's health
solvent
The substance which does the dissolving (typically a liquid, such as water or alcohol). Must be greater than 50% of the solution
solute
The substance which is dissolved, or has gone into solution (typically a solid)
solution
A homogeneous mixture of two or more substances. in a solution one pure substance is dissolved in another pure substance homogeneously The individual substances may be present in varying amounts
report mercury spills from a broken thermometer to the instructor and should be disposed immediately
because mercury is toxic
concentration
The relative amount of solute and solvent in a solution
never return unused chemical to a reagent bottle
doing so may contaminate the reagent bottle
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