Question

Which of the following is an example of a chemical change?

A. Iron changing color when heated
B. Gas bubbles forming in boiling water
C. Balls of wax forming when melted wax is poured into ice water
D. A gas when vinegar and baking soda are mixed

Answer 1

A is wrong because something getting heated does not mean a chemical change.

B is wrong because its physical

C is wrong because its physical

D is correct because there is a new product.

btw the chemical formula for vinegar and baking soda is this I think:

CH3COOH + NaHCO3 ⇒ CH3COONa + CO2 + H2O.

Answer 2

HELLO THERE

THE ANSWER IS

D. A gas when vinegar and baking soda are mixed

EXTRA INFO: An exmaple of phyical change is sawing a piece of wood

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HOPE THIS HELPS