Skip to content

Monthly Archives: January 2017

Enthalpy of Solution

Introduction The magic of hot and cold packs lies in the chemical reactions inside; they undergo a dramatic temperature change after an activation step. You may have noticed in previous experiments that sometimes dissolving a salt makes a solution warm, other times it will make the solution cold. This property of salts is the basis for many commercial […]

Colors, Part I: Absorption

Learning goals: work collaboratively with a lab partner, collect and analyze experimental data, formulate a logical conclusion based on experimental data Note: Plan on dressing in old clothes for this lab. These dyes are powerful and may permanently stain your clothes if you splash or drip them on yourself. Introduction Color vision provides a window […]

Estimation of Avogadro’s Number

Introduction Atoms and molecules are incredible tiny and weigh hardly anything, so scientists usually count them in terms of moles, which is 6.022140857 x 1023 particles. Why? For the same reason that we measure distance in terms of miles and donuts in terms of dozens: when you are counting to big numbers, it is easier […]

Molecular Modeling – Digital and Analog

Learning goals: follow instructions to complete a chemistry experiment, collect experimental data Introduction Models provide a useful way of visualizing the arrangement of electrons in a molecule. As you learned in class, there are several types of structure representations used by the chemist at different times to explain chemical phenomena. Today, we will use 3 […]

Deduction of an empirical formula

Learning Goals Build confidence in yourself as an independent experimentalist; Perform chemical degradation analysis, then use the results to calculate an empirical formula; Use a gravity filtration apparatus; Use a drying oven; Use a Bunsen burner to heat a solid; Observe a redox reaction and a precipitation reaction; Identify sources of uncertainty associated with the […]