Microscale Chemistry: Can you provide some information on microscale chemistry please?
This Connected Learning Experience looks at chemical reactions.
Description: In this investigation, students explore important chemical reactions such as neutralisation and combustion and their application in our world. Students will review the signs that indicate a chemical reaction has taken place and then apply this knowledge to their investigations.
Students will be able to:
In this investigation, four different types of chemical reactions are performed one at a time. Students then test their understanding by performing six further reactions and for each one: predict the products, identify the type of reaction and write balanced word and symbol equations.
This CLE represents an extension to what is required at Year 10 in Chemical sciences. The Australian Curriculum does not require students to write formula or write and balance symbol equations.
Combustion reaction: Is there any danger in getting students to burn steel wool in the school laboratory? I'm thinking of Year 10 students. I can think of one problem... What surface should they burn it on? Is a wooden heat mat okay? What is the best way to light it? I've seen it done holding the base of a Bunsen burner, angling it towards the wool to ignite it. Is this okay for students to do? I know the wool needs to be fluffed up to allow enough oxygen to circulate within it.
Making ionic compounds: I need help to understand the products we ended up with when we ran this practical.
Fresh solutions of sodium sulphide 0.1M and copper (II) chloride -0.1M were made up and 10 ml of each were mixed together as described in the practical.
The precipitate formed was black, but when filtered, the filtrate was yellow! Once the filtrate was evaporated off, the crystals remaining in the watch glass were sodium chloride.
This video demonstrates the production and uses of CO2.
This Surfing Scientist video (3 minutes 40 seconds) examines the chemical reaction between bicarb soda (sodium bicarbonate) and vinegar (acetic acid), producing invisible carbon dioxide that can be used to blow out candles on a birthday cake. A great way to create new interest in a well-known reaction.
This video also challenges the misconception that all gases are dangerous, or that they all rise up in the air.