Question

While modelling a volcano using two substances, Dereck observes bubbling and fizzing. Which of the following best names and explains the change that causes bubbling and

fizzing?
Chemical change, because bubbling and fizzing indicate transfer of heat within substances
Physical change, because bubbling and fizzing indicate transfer of heat within substances
Chemical change, because bubbling and fizzing indicate production of a gas, which is a new substance
Physical change, because bubbling and fizzing indicate production of a gas, which is a new substance

Answer 1

Chemical change, because bubbling and fizzing indicate production of a gas, which is a new substance.

Answer 2

• Chemical change, because bubbling and fizzing indicate production of a gas, which is a new substance.

Step-by-step explanation:

When you model a volcano using two substances and observe bubbling and fizzing you must think that the bubbles are a new gas produced by the chemical reaction between the two substances.

Modelling volcanos is usually made by mixing vinegar (a solution of acetic acid) and baking soda (sodium bicarbonate).

Those two substances react producing carbonic acid and sodium acetate. Next the carbonic acid is decomposed into carbon dioxide and water.

The carbon dioxide is a gas (the same gas in the carbonated beverages) and is the substance that forms the bubbles and responsible for the fizzing.

Since the carbon dioxide is not present originally in either of the reactants substances (vinegar and baking soda) is a new substance, this is the product of the chemical reaction,