Nomenclature
Experiment 1 (Measurement and Density)
Experiment 2 (Elements, Compounds, and Mixtures)
Experiment 3 (Chromatography)
Safety and Equipment
100

What is this polyatomic ion?

NO3

Nitrate

100

What is the formula for density?

D = M/V

100

Is air an element, a compound, or a mixture?

Mixture because it comprises both elements and compounds like O2, N2, CO2, etc

100
What is the difference between absorption and adsorption?

Absorption = molecules penetrate the material 

Adsorption = molecules linger around  the surface of a material 

100

What is the only thing that can go down the sink?

Soapy water / water

200

Formula for N2H4

Dinitrogen tetrahydride
200

What is the average mass of this set of data?

3.7g, 4.6g, 5.2g, 2.3g

4.0g or 3.95g

200

What is the difference between heterogeneous and homogeneous mixtures?

Homogeneous = uniform 

Heterogeneous = not uniform

200
The solvent in the jar must be _____ when the TLC plate is set in the jar


a. above the pencil line

b. below the pencil line

Below because we don't want the pencil line to be in the solvent or it will stop the solvent from rising
200

What should be worn at all times?

A. Flip flops 

B. Safety glasses

C. Safety goggles

D. Shorts

GOGGLES

300

What is this acid's name?

H2CO3(aq)

Carbonic acid

300

What is the standard deviation for this set of data?

2.1, 2.3, 2.9, 2.4, 2.6

SD = range / sqrt of # of measurements 

SD =  2.9-2.1 / sqrt of 5

SD = 0.4

300

Name at least 3 types of methods of separation

Filtration, evaporation, decantation, chromatography, distillation, and solubility 
300

What is the formula for calculating Rf values?

Distance traveled by the solute (spot sample) / distance traveled by the solvent (liquid in jar)

300

What is this?

(Show a pic)

Erlenmeyer flask 

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