Student A rinsed three (3) Erlenmeyer flasks with distilled water and, then, to each was added a 25.00-mL aliquot of dilute hydrochloric acid, HCl(aq) . The solution was titrated to a bromothymol blue end point with standardized aqueous sodium hydroxide, NaOH9aq). Student B, his lab partner, challenged his titration results because Student A failed to wash the Erlenmeyer flask with the HCl solution of unknown concentration. A) Student A is correct because the moles of analyte is related to the HCl aliquot’s volume.

B) Student A made an error since the additional wáter alters the titration’s end point.

C) Student B is correct because moles of analyte are altered by the diluting wáter drops.

D) Student B is not correct because the bromothymol blue indicator is added to the buret.

The best solution for preventing harm to people and pets from severe hurricanes involves determining and warning residents about what

1. an experiment in your science class lists the materials needed for the lab. it is your job, as a lab partner, to measure out 25 ml of distilled water and 2.5 grams of magnesium. what lab measuring tools would you choose to measure each substance and how would you use each tool to get the correct amounts? be sure to describe the process you would follow step-by-step. (5 points) 2.which of the following is an si base unit for measuring mass? (2 points) ampere gram meter pound 3.which of the following is an si base unit for time? (2 points) decades hours minutes seconds 4.which of the following tools should a scientist use to measure an object in milligrams? (2 points) graduated cylinder pan balance tape measure thermometer 4.which of the following tools should a scientist use to measure an object in milligrams? (2 points) graduated cylinder pan balance tape measure thermometer. 5.a pencil beside a metric ruler. the ruler is scaled from 1 centimeter to 10 centimeters, with markings for millimeters between each number. one end of the pencil is beside the 0 on the ruler, and the pencil point is beside the 5. which of the following measurements is accurate but not precise? (2 points) 5 mm 5 cm 50 mm 50 cm 6. which of the following prefixes represents the largest value? (2 points) giga hector kilo milli 7. which of the following types of graphs is best for plotting the percentages of a whole value in a data set? (2 points) bar graph circle graph histogram line graph

Which of the following is a physical change? a.burning a piece of wood b.sawing a piece of wood in half c.rust forming on an iron fence d.a copper roof changing color from orange to green