What happens when samples of metals and non-metals are mixed with acids?

Explanation

**Step-by-Step Solution:**

1. **Understanding the Reaction of Metals with Acids:**
- When metals react with acids, they typically undergo a chemical reaction that produces a salt and hydrogen gas.

2. **Example of Metal Reaction:**
- For instance, when magnesium (Mg) reacts with hydrochloric acid (HCl), the reaction can be represented as:
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