CHEM 1c practice

glassware used to accurately transfer small variable volumes

graduated (mohr) pipet

glassware used to accurately transfer small fixed volumes

volumetric pipet

glassware used to accurately transfer & measure variable volumes

buret

glassware used when contents must be easily accessed

beaker

glassware used to prevent splashing or evaporation

Erlenmeyer flask

glassware used to make & store solutions of known concentrations

volumetric flask

Which of the following are possible reasons that you may need to dilute the bleach solution given (in reference to lab 3 session 2) (may be more than one answer)

*the dye is unreactive

*the concentration of the dye is too high

*the absorbance never decreases

*the reaction occurs too quickly to get good data

*the temperature of the solution is too low

Bleach breaks down dyes, removing color from solution, fabric, etc. Which of the following statements is/are correct?

-Red 40 breaks in 2 are the azo linkage

-Triarylmethane dyes react at their center carbon in a way that either separates the 3 aryl groups into 3 different chemicals

Which of the following actions should you take if you or a labmate are on fire?

-wrap the person in a fire blanket

-stop, drop, & roll

Referring to the PASS acronym, what does each letter stand for

Pull, Aim, Squeeze, Sweep

Referring to the P in the PASS acronym, what would you do?

pull the safety pin near the hand

Referring to the A in the PASS acronym, what would you do?

Aim the extinguisher at the base of the fire

Referring to the first S in the PASS acronym, what would you do?

Squeeze the handle to begin the discharge

Referring to the second S in the PASS acronym, what would you do?

Sweep the discharge back and forth at the fire

What are the four parts of the fire tetrahedron

heat, oxygen, chemical chain reaction, fuel

Which volume show the correct number of significant figures when using a 1 mL volumetric pipet

1.00 mL

What percentage of known chemicals have safety data sheets (SDS)

0.1%

Who creates SDS?

chemical suppliers

What GHS components are incorporated in SDS?

all of these (idk that was the correct answer)

Because SDS legally required to be accurate, one should

are not, examine SDSs from other manufacturers

SDS are written for__ setting, because of this, chemical hazards and PPE requirements may be__

industrial, overstated

What are the steps of using an SDS

1) compare label info

2)determine hazard class

3) look at the procedures

Which of the following should be done when handling a corrosive?

-carry bottles in secondary containers

-know the location of eyewash stations & safety showers

-use in the fume hood if the corrosive is an inhalant hazard

-wear long sleeved shirts, long pants, & liquid shedding close toed shoes

-if exposed, wash off skin immediately

-wear goggles, lab coat, & gloves

-discard gloves after contamination or taking off