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See: The solution turned brown and effervescence was formed. A hole was burnt through the bottom of the aluminium cupcake tray.

Think: The blue solution reacted with aluminium and produced a gas.

Wonder: What is the blue solution? How was the hole made?

Explanation: The blue solution is copper (II) nitrate. Aluminium is more reactive than copper, hence it will displace copper from its compound to form aluminium nitrate, a blue solution. Copper metal, brown solid, will be formed.

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See: effervescence observed. The aluminium reacted with the green solution to form a black solution and a colourless gas.

Think: Metal and acid reaction? Aluminium reacted with an acid to produce hydrogen gas.

Wonder: what was the gas produced?

Explanation: the blue solution is copper(ii) nitrate. Since copper is less reactive then aluminium, the aluminium displaces the copper to form copper metal and aluminium nitrate.

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See: Efferverscenece formed. Aluminium dissolved in green solution to form black solution and colourless gas.

Think: Green solution reacted with aluminium

Wonder: What was the gas formed? Was the gas pungent?

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See: Effervescence observed. Green solution reacted with the aluminum cupcake tray and turnt black,  also making a hole in the cupcake tray.

Think: this is some kind of chemical reaction between the green solution and the aluminum cupcake tray.

Wonder:  what happened? What causes this to happen?

Explanation: the blue solution is copper (ll) nitrate. Aluminum is more reactive than copper, thus it displaces the copper from the copper (ll) nitrate solution leaving copper metal as residue which can be seen on the sides of the cupcake tray.

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See: effervescence was observed, blue solution caused a hole in the aluminium cupcake tray to form, a gas was produced.

Think: the blue solution reacted with the aluminium to produce hydrogen gas

Wonder: what is the blue solution?

Explanation: the blue solution is copper(II) nitrate. Aluminium is more reactive than copper and thus displaces copper from copper (II) nitrate to form aluminium nitrate and copper metal.

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See: Effervescence observed. The blue solution burnt a hole through the bottom of the cupcake tray

Think: the blue solution reacted with the aluminium and produced a gas

Wonder: what is the blue solution ? What happened?

The blue solution is copper(II)nitrate. Aluminium is more reactive than copper, so it displaces copper from its solution, forming aluminium nitrate (solution in the cup) and copper metal(left on the cupcake tray)

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see: Effervescence was observed. The centre bit of the cupcake tray had also melted, causing a hole to form. A gas was also produced, and a solid and solution was formed.

think: The blue solution had reacted with aluminium to produce a large amount of heat that had melted the tray and produced a gas.

wonder: How did the reaction happen?

explanation: A displacement reaction has taken place. The original blue solution was copper (II) nitrate, and upon reacting with aluminium, the copper was displaced since it is less reactive than aluminium. This caused the formation of copper metal, the solid that had remained on the sides of the cupcake tray, as well as aluminium nitrate, the solution that had gathered at the bottom of the cup.

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See: After the blue solution has been poured into the aluminium tray, it starts to fizzle and bubble and dissolved the aluminium tray.
Think: The element in the blue solution reacts with aluminium and dissolve it
Wonder: Does this reaction happen to other metals or just aluminium? Will reaction with other metals be as fast as that of aluminium.

I think the blue solution is copper nitrate. As aluminium is more reactive than copper, it displaces copper, forming aluminium nitrate solution and copper. As a result, the aluminium tray

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See: Effervescence observed. The blue solution formed a hole at the bottom of the cupcake tray. There was dark brown precipitate formed around the sides of the aluminium tray

Think: The blue solution reacted with the aluminium to produce a gas.

Wonder: What is the blue solution? Does such a reaction only occur with aluminium metal?

Explanation: The blue solution is copper(II) nitrate. Since aluminium is more reactive than copper, it displaced copper to form aluminium nitrate (solution left in the cup) and copper metal (dark brown precipitate left behind).

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See: Effervescence observed. A hole in the cupcake try was formed. Brown ppt present along the sides of the cupcake tray.

Think: Blue solution reacted with aluminium, producing a gas.

Wonder: What is the blue solution?

Explanation: The solution was copper (ll) nitrate. A displacement reaction occured as aluminium is more reactive than copper. Thus, aluminium replaced copper in the solution to form aluminium nitrate. Copper metal was formed and seen on the cupcake tray.

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See: Effervescence was observed and after a while, a hole in the aluminium cupcake tray was formed, causing the blue solution to enter the wine glass. Brown ppt can also be seen on the sides of the aluminium cupcake tray.

Think: The blue solution may be acidic, causing a chemical reaction with the aluminium (metal).

Wonder: If the cupcake tray were made of a different material, would the same reaction occur?
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The blue solution is copper (||) nitrate. Since aluminium is more reactive than copper, it displaces copper and as a result, aluminium nitrate and copper metal is formed.

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See: There was bubbling and it caused a hole at the bottom of the cupcake tray. There was also a bit of dark brown precipitate left behind at the sides of the cupcake tray after the reaction.

Think: The blue solution reacted with the aluminium. There was gas produced as there was condensation on the sides of the glass cup at the end of the reaction.

Wonder: What is inside the blue solution that reacted with the aluminium?

Explanation: Blue solution is copper nitrate. Aluminium reacted with the copper nitrate to form copper metal and aluminium nitrate as aluminium is more reactive than copper and displaced it. The aluminium nitrate is the solution formed in the glass cup and the copper metal is the dark brown precipitate left at the sides of the aluminium tray.

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See: Effervescence observed, and heat was produced causing the Aluminium to melt and a hole is formed.
Think: The blue solution may be an acid which reacted with Aluminium to produce hydrogen, which forms the effervescence observed. Due to a high reactivity that Aluminium has, it caused a large amount of heat to be produced which melted the Aluminium.
Wonder: why is Aluminium so reactive? What determines the reactivity of a metal?

Explanation: the blue solution is silver nitrate, so since aluminium is more reactive than silver, it corrodes faster therefore forming the hole.

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See: Effervescence observed, a hole was form in the aluminium cupcake tray. There were remaining brown precipitate found along the sides of the aluminium tray. Condensation was formed on the inner surface of the glass cup.

Think: The blue solution reacted with aluminium to produce hydrogen.

Wonder: Does this blue solution only react with aluminium?

The blue solution is copper (II) nitrate. Aluminium is more reactive than copper, thus aluminium displaces copper from copper (II) nitrate and forms aluminium nitrate. Hence, aluminium nitrate is collected in the cup and the remaining black solid is copper.