Question

When a substance has changed into something new or different so that the original substance is gone, as in digestion, radioactive decay, or a battery in a flashlight producing light, it is known as a ______________________________.
a.physical property
b.chemical property
c.physical change
d.chemical change

Answer 1

Answer:

d . chemical change.

Explanation:

Physical change involves change which can be retrieved back . sugar is dissolved in water . It is physical change . because sugar can be retrieved by evaporating water.

burning of coal is a chemical change because the ash that we get after burning coal can not be turned into coal .

In the given case in the problem , after digestion , things that  are formed are  quite different . After radioactive decay new element is produced . In battery , current is produced after the chemical reaction which produces new products.

Hence all they involve chemical change.

Answer 2

Answer:

d

Explanation: