Which of these is an example of a chemical change? dissolving two cups of flour in a liter of water pouring water from a large trough into a beaker decreasing the motion of water molecules by freezing forming oxygen by bubbling fluorine through water

Forming oxygen By bubbling flourine through water

Explanation:

Chemical change is the change in which chemical composition of the substance changes by rearrangement of atoms.

Physical change is a change in which only the physical properties such as size, shape etc change and there is no rearrangement of atoms.

1. Dissolving two cups of flour in a liter changes the state and hence is a physical change.

2. Pouring water from a large trough into a beaker is a physical change.

3. Decreasing the motion of water molecules by freezing changes the state and hence is a physical change.

4. Forming oxygen By bubbling flourine through water involve rearrangement of atoms and thus is a chemical change.

the correct answer is option d

explanation:

i was wrong its d because they dont use cm when calculating square roots

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e