Activity 2: Suggest the identity of the blue solution and explain your observations on your padlet.

Label your answers as Activity 1: See , Think and Wonder
2. Explanation

Think: what do you think has happened? 

I think the blue solution reacted with the aluminum to form a new substance

Wonder: any questions you have at the end of the video? 

What is the new black/brown substance formed.

Suggest the identity of the blue solution and explain your observations on your padlet!

The blue solution is copper chloride/copper sulfate/copper nitrate. Copper is less reactive than aluminum.

I see a chemical being poured onto a cupcake tin which then caused a hole to be formed. There is effervescence and the colour of the chemical changed at then end of the reaction.

I think the chemical being poured into the cupcake tray reacted with the aluminium which resulted in the change on state of the metal as well as the colour of the chemical

The blue solution could be copper (II) sulfate or nitrate. (Blue-green solution at the start -copper) Aluminium is more reactive than copper and hence the aluminium ions displaced the copper ions. 

activity 1: 

see: 

a beaker of blue-green solution was being reacted with aluminium. effervescence was observed almost immediately. the reaction had caused a hole in the cupcake tray (aluminium) and resulted in a brown/dark purple solution forming which did not corrode the glass.

think:

a chemical reaction (probably due to/revolves around metal reactivity) had taken place 

wonder: 

what was the initial substance as well as the end product?

why and how did the reaction happen so quickly and vigorously? 

The blue solution could either be aqueous copper nitrate or aqueous copper sulfate, solutions which are blue-green in nature. Copper ions in the aqueous solution were displaced by the more reactive aluminium. 

- See: effervescence is observed. The blue solution  reacted with the aluminium cupcake tray, forming a hole in the tray and blue solution flows into the glass. Blue solution turns black. 

- Think: a chemical reaction has taken place and a new compound was formed, resulting in the change of the colour of the solution. 

- Wonder: what is the blue solution? What kind of reaction was it, a displacement reaction in which the metal was displaced?

Activity 2: explanation 

- The blue solution may be copper (II) nitrate. Aluminium is more reactive than copper, thus displacing copper in the compound to form aluminium nitrate and copper metal through a displacement reaction. 

Think: I think a chemical reaction took place with the blue solution and aluminium, thus causing a hole in the aluminium cupcake holder and allowing the black solution to enter and drop into the glass cup.

Wonder:

Was it a chemical reaction? (What kind of reaction?)

What is the blue solution?

Why did the reaction cause a hole in the aluminium?

What is the black solution at the end?

Activity 2: Explanation

Identity of blue solution—copper(II) nitrate. A displacement reaction occurred, whereby the copper in the solution was displaced by aluminium since aluminium is more reactive than copper. Thus, aluminium nitrate solution and copper metal were formed.

See: 

Think: 

Wonder: 

Activity 2:

Explanation: The identity of the blue solution could be either copper(II) sulfate or copper(II) nitrate, as the appearance of copper(II) matches that of the blue solution, and sulfate and nitrate are soluble. Since according to the metals reactivity series copper is much less reactive than aluminium, copper ions would have been displaced by the faster-reacting aluminium ions, leading to the reaction observed and resulting in the hole formed and the change in colour of the solution/substance.