CHEMISTRY 30A LAB PRACTICAL INFORMATION V1) Read and interpret correctly the lab
ID: 1063510 • Letter: C
Question
CHEMISTRY 30A LAB PRACTICAL INFORMATION V1) Read and interpret correctly the label on a bottle including the safety precautions (hazard code). This may include giving the chemical formula for the substance given the name or vice-versa 2) Measure the length of an object using a ruler and record it with the allowable number of significant figures 3) and correct unit. record it with the number of Measure the mass of an object using an electronic balance and allowable significant figures and the correct unit. units). V Measure dispense volume of a liquid using a graduated cylinder (correct number of sig figs and 4) the solution meter will not be asked to calibrate the meter). Measure pH using a pH V 6) whether a solution is acidic, basic, or neutral. 7) Determine the properties of a solution, using an indicator. (You may be asked to recall the color paper in acids and bases.) 8) Measure the temperature of a liquid 9) Light and control a Bunsen burner safely using either a match or a striker. 10) Test an unknown solution for the presence of starch, glucose, and/or chloride ion. V11) Determine the density of a substance (solid or liquid only). 12) Determine the concentration of a solution given its density. Calculate the amount of solute (e.g. sugar) from the concentration and the amount of solution. 13) Prepare a solution with the correct concentration m/v concentration or molarity only). 14) Perform a dilution. You need to know the dilution formula. M5) Identify common pieces of laboratory equipment and their uses. 16) Determine whether a chemical is soluble in water. 17) Identify the product in a precipitation reaction.Explanation / Answer
10)Starch is slightly soluble in water where are glucose is highly soluble in water. Solubility test can be used to distinguish between starch and glucose.
12) Density = mass/ Volume
concentration is expressed in moles/unit volume
dividing the density with molar mass gives concentratio
moles of solute= concentration* Volume of solution (L)
Volume of solution = mass of solution/ density