NEW
Font size
WorksheetsLab Assistant Practice
Total questions: 23
Worksheet time: 12mins
If an aqueous solution has H3O concentration of 1 x 10-9 mol/L, the solution is:
acidic and litmus paper will turn red
basic and litmus paper will turn red
acidic and litmus paper will turn blue
basic and litmus paper will turn blue
What type of liquid is pentanol?
Trihydroxil alcohol
Cyclic hydrocarbon
Polymer
Primary alcohol
What is the characteristic of most organic compounds?
Low melting point
Intermolecular force
Highly soluble in water
Ionic
Which device records the amount of light coming through a sample in a Spect20?
Sample well
Injector
Diverter
Detector
According to the ASTM, an acceptable elapsed time for a viscosity test is how many minutes?
1 to 3
5 to 10
10 to 12
12 to 15
1s 22s 22p63s 24s2 This electron configuration has an incomplete:
Second principle energy level
Second sublevel
Third principle energy level
Third sublevel
3 things that must appear properly kept in a laboratory databook page are assistant's signature, date, and:
Title of witness
Procedure
Witness's signature
Next scheduled activity
What does the 50 in the following signify: LD50
Lethal dosage that killed everyone in the population over the age of 50
Lethal dosage since 1950
Lethal dosage that caused the death of 50% of an animal population
Lethal dosage that killed everyone in the population under the age of 50
The only time g = mL is when:
The substance is alcohol
Acids are being made
Bases are being made
Water is the solvent
According to EPA, when taring for TSS and TDS how accurate in grams must the weight be?
0.005
0.05
0.5
5
What is the formula for aldehyde?
RCOR'
RCHO
RCOOR
ROR'
The compound CH 3 COCH3 is an example of what?
Ester
Aldehyde
Ether
Ketone
What is the unit for viscosity?
sec
stoke
mho
ntu
Which are common units for conductivity?
siemens and mho
ohms and ntu
moles and amperes
watts and voltage
A Spect20 was used to analyze an NO3 sample. The trend line found was y = x + 157.12. If a downstream sample reads 0.543 ABS, what is the ppm of NO3?
157.66
156.58
157.62
156.53
If a noxious organic chemical is spilled, the most effective respirator is one that has which type of cartridge?
Acid gas
HEPA
Activated carbon
Vapor gas
Which salt solution is in a pH probe?
NaCl
KCl
HHP
NaBr
How many atoms are in 1.0M of iron?
6.02*1023
2(6.02*1023)
6.02*1023/4
6.02*1023/2
Name the following compound: HOCH2CH2CH2CH2OH.
1,4-dibutanol
1,4-butanol
1,4-dipentanol
1,4-pentanol
Which primary eye protection is used when working with concentrated acids and bases?
Lab safety goggles
Wrap around safety glasses
Side shield safety glasses
Chemical goggles
If 36 μg of Substance A is mixed with 795 mg of Substance B, the ppm concentration is
831
22
45
759
What group is made of alkali metals?
1
2
3
4
What group is made of alkaline earth metals?
1
2
3
4
