Which of the following is a serious source of experimental error? a. The sodium hydroxide is not mixed completely in the Florence flask.
b. The buret is not conditioned.
c. The KHP samples are dissolved in 50 mL (not 25 mL) of distilled water.
d. Two drops (not one drop) of phenolphthalein indicator is used.
e. Bubbles are not cleared from the tip of the buret.
f. The Erlenmeyer flasks are not dry before pipetting the vinegar samples.

Follow the steps provided in the simulation to add water to the graduated cylinder, select one of the three samples (copper, silver, or gold), set its mass to the values given in the statements below, and calculate its density. here is a summary of the steps required: add water by clicking and holding prepare a known volume of water button. until the desired volume of water has been added. if more than the desired volume is added, click the reset button. button and redo the procedure. a single click will add about 21.0 ml of water. to set the mass, click and hold weigh out metal button. until the desired amount of metal is added to the weighing pan. once the desired mass of the metal is added, release the button. transfer the metal to water and then click on calculate density button. to see how the density is calculated using water displacement to measure the volume of the solid. to save time you can approximate the initial volume of water to â±1 ml and the initial mass of the solid to â±1 g. for example, if you are asked to add 23 ml of water, add between 22 ml and 24 ml. which metals in each of the following sets will have equal density? check all that apply.

According to the vsepr theory what is the shape of a molecule that has a central atom valence three other items with no lone pairs of electrons

Which class of molecules functions as chemical signals? hormones water carbohydrates proteins