Question

1. natural gas burns on a stove to heat food.

type of change:
explanation:

Explanation:

Natural gas burning involves a chemical reaction (combustion) where methane ($CH_4$) reacts with oxygen to form new substances like carbon dioxide ($CO_2$) and water ($H_2O$), releasing energy. A chemical change is defined by the formation of new substances, so this is a chemical change.

When natural gas (mainly methane) burns, it undergoes a chemical reaction with oxygen. The reaction is $CH_4 + 2O_2
ightarrow CO_2 + 2H_2O$, forming new substances (carbon dioxide and water) and releasing energy, which fits the definition of a chemical change (a change where new substances are formed).

Answer:

Type of change: Chemical change