Evidence of Chemical Reactions Answers

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Each of the items pictured represents a different chemical reaction. Rank these four reactions in order from fastest to slowest.

A black powder is added to a clear liquid. Fizzing and bubbling occur, and the test tube becomes hot to the touch.

Two solids are combined. After a small amount of heat is applied, an explosion occurs and smoke is released.

Drops of a clear liquid are added to a red liquid. As the drops are added, the red liquid becomes orange, then yellow.

When an egg is placed in a hot frying pan, the yolk and white become firmer and more opaque, and steam is emitted.

Two colorless chemicals combine inside a glow stick. When the chemicals combine, they produce brightly colored light. The glow stick’s temperature does not change.

Bread dough rising:

Adding road salt to an icy street:

Igniting a road flare:

Adding bleach to colored fabric: