one reaction was between the aluminum and the leftover hydrochloric acid the products are aluminum chloride and hydrogen gas. the other reaction was the aluminum and the copper(II)chloride.. this produced aluminum chloride and copper metal. what was the evidence that hydrogen gas was procuced? what was the evidence that the copper(II)chloride was no longer present? where was the aluminum chloride that was formed?

There isn't enough information there for me to know what you are/were doing. Clarify the question along with what you were doing; perhaps we can help. By the way, start a sentence with a capital letter. It makes a question easier to read.

To determine the evidence that hydrogen gas was produced in the reaction between aluminum and hydrochloric acid, you can look for the following signs:

1. Gas bubbles: When a reactive metal like aluminum reacts with an acid like hydrochloric acid, it releases hydrogen gas. Look for effervescence or gas bubbles being formed during the reaction. This is a visible indication of the presence of hydrogen gas being produced.

2. Pop sound: Hydrogen gas is highly flammable. If you collect the gas and ignite it, you will observe a distinctive pop sound. However, please note that for safety reasons, this demonstration should be carried out with caution and proper safety measures.

Regarding the evidence that the copper(II) chloride was no longer present after the reaction with aluminum, you can consider the following observations:

1. Change in color: Copper(II) chloride has a distinctive blue-green color. If the copper(II) chloride is no longer present, there may be a change in the color of the reaction mixture. It may become colorless or less intense in color.

2. Precipitation: Copper in solution can form a solid precipitate when it reacts with certain chemicals. If there is no evidence of a solid precipitate forming after the reaction, it suggests that the copper(II) chloride is no longer present.

Finally, regarding the location of the aluminum chloride that was formed, it would be in the resulting solution from the reactions. Aluminum chloride dissolves easily in water, forming a colorless solution. So, after the reactions occur, the aluminum chloride would be present in the solution formed from the reaction mixture.