Question

14 which of these is not evidence of a chemical reaction? a an antacid tablet produces bubbles of gas when placed in water. b a piece of zinc raises the temperature of an acid as it reacts with it. c an iron nail changes to a brownish - orange color. d an ice cube melts into liquid water.

Explanation:

A chemical reaction involves a change in chemical composition. Antacid - gas production is a chemical change. Zinc - acid reaction shows heat change indicating a chemical reaction. Iron - color change is due to rusting (chemical reaction). Ice - melting is a physical change (change of state from solid to liquid without changing chemical composition).

Answer:

D. An ice cube melts into liquid water.