Question

Which of the following equations demonstrates an actual chemical reaction that forms a new substance?

A1: ZN + 2HCl → 2NCl2 + H2

A2: H2O + NaCl → H2O

A3: Zn + Al + Cu → Zn + Cu + Al

A4: C12H22O11 + H2O → H2O + C12H22O11

Answer 1

hope this helps you!

Step-by-step explanation:

Answer 2

Answer:
`Zn+2HCl\rightarrow ZnCl_2+H_2`

Step-by-step explanation:

A chemical reaction is said to have occured when reactants react to form new products where the atoms undergo a change in bonding.

From the given reactions:

1.
`Zn+2HCl\rightarrow ZnCl_2+H_2`

Here Zn combines with hydrochloric acid to form zinc chloride and hydrogen.

2.
`H_2O+NaCl\rightarrow H_2O`

Here water remains as such as no new substance is formed.

3.
`Zn+Al+Cu\rightarrow Zn+Cu+Al`

Here no new substance is formed.

4.
`C_(12)H_(22)O_(11)+H_2O\rightarrow H_2O+C_(12)H_(22)O_(11)`

Here no new substance is formed.

Thus
`Zn+2HCl\rightarrow ZnCl_2+H_2` demonstrates an actual chemical reaction that forms a new substance