CHEMICAL CHANGE Signs of a Chemical Change WHAT

CHEMICAL CHANGE Signs of a Chemical Change

WHAT IS A CHEMICAL CHANGE • Definition: A change that alters the identity of a substance resulting in a new substance or substances with different properties.

CHEMICAL CHANGE • https: //www. youtube. com/watch? v=Fof. Pjj 7 v 414

SIGNS OF A CHEMICAL CHANGE • There are 4 signs to look for that signal a chemical change may have taken place: • Color Change • Temperature Change • Formation of Gas • Formation of a Precipitate

COLOR CHANGE • Everyday examples include: • • • A banana turning brown as it ages Burning things turning black The chemicals in this video: https: //www. youtube. com/watch? v=ad-C 2 xz 5 D 4 c Other examples? • Adding coloring to water is not a chemical change. Why not?

TEMPERATURE CHANGE • Everyday examples include: • • • Activating an icepack Causing something to explode (due to heat) The chemicals in this video: https: //www. youtube. com/watch? v=GQk. JI-Nq 3 Os Other examples? • Freezing water into ice is not a chemical change. Why not?

FORMATION OF A GAS • Everyday examples include: • • • Mixing baking soda and vinegar Smoke made when things are burned The chemicals in this video: https: //www. youtube. com/watch? v=5 q 5 bz. Hck. SIM Other examples? • Boiling water is not a chemical change. Why not?

FORMATION OF A PRECIPITATE • Precipitate: Solid particles that form or separate out of a liquid • Everyday example: • Adding lemon to milk (or letting milk to get old and curdle) • The chemicals in this video: • https: //www. youtube. com/watch? v=2 EQzn. GPZY 5 A