## Identifying powders by molar mass

In this activity, students choose from a variety of similar white solids and identify them using molar mass.

Students must generate their own procedure in this lab.

Molar Mass: Student Handout

Molar Mass: Teacher Notes

Students must generate their own procedure in this lab.

Molar Mass: Student Handout

Molar Mass: Teacher Notes

## What is the cost of an atom of aluminum?

Give the class a roll of aluminum foil, in the box, with a price tag on it.

Give each group a square of the foil (we used approx. 15x15cm squares) along with the task: Can you determine the cost per atom of aluminum?

This lab requires minimal direction (I just put the question on the board!), and it's very accessible... but the calculations require some real thought!

- centimetres to metres, grams to moles, moles to atoms, and then the cost piece...

Prior knowledge needed: unit conversions, Avogadro's number, and molar mass of elements.

This lab emphasizes how crazy-small atoms really are!

Cost of Aluminum (website)

Give each group a square of the foil (we used approx. 15x15cm squares) along with the task: Can you determine the cost per atom of aluminum?

This lab requires minimal direction (I just put the question on the board!), and it's very accessible... but the calculations require some real thought!

- centimetres to metres, grams to moles, moles to atoms, and then the cost piece...

Prior knowledge needed: unit conversions, Avogadro's number, and molar mass of elements.

This lab emphasizes how crazy-small atoms really are!

Cost of Aluminum (website)

## Find the evaporation rate of water

This activity comes from BC Science Chemistry 11 (Edvantage) - Act 3.3, p.129

I used this more as a demo / group question and built the data from it into our in-class practice.

Q: What is the evaporation rate of water, in molecules per second?

Ask students to make a guess... Then, what we would need to calculate this? What can we actually measure?

Mole calculations will take us from grams per minute to molecules per second. Students were surprised by the answer!

I used this more as a demo / group question and built the data from it into our in-class practice.

Q: What is the evaporation rate of water, in molecules per second?

Ask students to make a guess... Then, what we would need to calculate this? What can we actually measure?

Mole calculations will take us from grams per minute to molecules per second. Students were surprised by the answer!

## How many waters are in this hydrate?

This lab uses Copper(II) sulfate and Cobalt(II) chloride hydrates, so that different groups have different data.

The procedure is brainstormed as a class, and some guidance is required for the analysis portion.

Hydrate Lab: Student Handouts

Hydrate Lab: Teacher Notes

The procedure is brainstormed as a class, and some guidance is required for the analysis portion.

Hydrate Lab: Student Handouts

Hydrate Lab: Teacher Notes