CHM161-exam1

What purposes can funnels serve in the lab?

1. Support for filter paper during a gravity filtration 2. Assistance for pouring liquids into burets

Calculate the grams of ethane present in a sample containing 0.7080 moles if the molar mass of ethane is 30.067 g/mol.

21.287436g

Identify effective techniques for accurate pipet use.

1. Measure liquid by aligning the meniscus with the volume line. 2. Do not let liquid enter the pipet bulb or pump.

Read the Safety Data Sheet (SDS) (click the SDS icon below) of hydrogen peroxide to identify the type of eye protection recommended when handling this substance.

Tightly fitting safety goggles.

Which is NOT a good source of information about the hazards that affect waste disposal in a chemistry lab?

Your lab partner

t is often helpful to remember the acronym PASS when using a fire extinguisher. Fill in the word that corresponds with each letter to complete the steps needed for operation of this device.

1. pull the pin 2. aim the nozzle at the base of the fire. 3. squeeze the nozzle 4. sweep the spray from side to side of the fire.

In general, which characteristics are necessary for a location to be suitable for chemical storage?

Dark, cool, dry

Suppose that two students perform a titration experiment multiple times, resulting in the average concentrations reported here. Student A 0.125 ± 0.008 M Student B0.12 ± 0.03 M

The more precise work was done by student A because that student's data has a smaller standard deviation.