CHM lab final

which of the following count as one electron domain?

-a lone pair of electrons -the pair of electrons in a single bond -the four electrons in a double bond

The larger the "load" connected to the hand-held device, the larger the amount of work the device must do. How does one assess how large the load is in this lab?

By how hard the handle is to turn

What is the name of the hand-held device used to produce electricity In this lab?

DC generator

Non-spontaneous reactions are reactions that do not automatically produce any product. How can products be made to form from a non-spontaneous reaction?

Products cannot be made to form from a non-spontaneous reaction.

Suppose the pinch clamp on the flask assembly was not opened prior to heating the flask assembly in boiling water. Which of the following is the most likely problem that this would create?

The stopper assembly might be forced out of the mouth of the flask

A blank is a solution that should contain

everything that the sample contains except for the species to be determined.

The electronic geometry gives the "actual shape of a molecule"

false

The volume occupied by air inside the flask is equal to the volume engraved on the flask.

false

In this lab the volume of the Erlenmeyer flask is measured by

filling the flask with water, the transferring the water to a graduated cylinder.

According to Beer's law, a plot of absorbance vs. concentration is

linear

The Dumas method is used to determine the ______ of a volatile liquid.

molar mass

An indication that vaporization of the unknown liquid is complete is that the

ring of liquid around the boiling stone disappears or stops changing.

A cuvette is a

sample holder for measuring absorbance

The electronic geometry of PCL3 is

tetrahedral

In this lab the inside of the flask must be absolutely dry before it is fitted with the stopper assembly and weighed. The main reason is that

the water inside the flask is hard to get to evaporate.

The molecular geometry of PCL3 is

trigonal pyramidal

Electrical work is done by turning the crank of the hand-held device.

true

Which instrument is used to measure the amount of voltage produced from the reaction between a metal and an ionic compound?

voltmeter