Unit 5 lesson 13, chemical reaction unit test. Which of the following equations shows a chemical change?

Answer 1

To determine which equations show a chemical change, it's essential to look for signs that a new substance is formed, which usually involves the breaking and forming of bonds between atoms. Chemical changes typically involve:

1. The formation of a precipitate (a solid that forms from a solution).
2. Gas production (bubbles or odorous gas emissions).
3. Color change (a distinct change indicating a new substance).
4. Energy change (such as release or absorption of heat).

If you provide the specific equations in question, I can help analyze them to identify which one represents a chemical change.