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Table 1 Description of chemistry laboratory activities observed

From: Characterizing science graduate teaching assistants’ instructional practices in reformed laboratories and tutorials

Nature of laboratory activity

Laboratory topic

Brief description of laboratory activity

Number of observations

Conceptual

Electric solutions

Inquire about electrolytes using a conductivity apparatus and various solutions

11

Thermochemistry

Inquire about how and why acid strength affects the heat of a neutralization reaction

3

Conceptual/analytical

Environmental solutions I

Conceptualize a calibration curve and calculate serial dilutions

4

Environmental solutions II

Perform serial dilutions; conduct spectroscopic analysis on an unknown water sample

15

Chemical kinetics

Explore reaction rates and reaction orders in order to determine how changing the concentration of reagents affects the reaction rate

11

Hard water ions

Titration analysis to calculate the concentration of hard water ions in tap water

14