Which of these are chemical changes in matter? check all that apply. mixing lemonade powder in water bleaching your hair mowing the lawn lighting a match letting fruit rot?

Answer is: bleaching your hair, lighting a match letting fruit rot.

bleaching your hair, lighting a match letting fruit rot are chemical changes (chemical reactions), because new substances are formed, the atoms are rearranged and the reaction is followed by an energy change.

Physical property can be observed and measured without any changes in molecular composition.

The same substance is present before and after the psysical change (mowing the lawn), just with different form or state of matter.

Making mixture (mixing lemonade powder in water) is physical change (physical change is reversible).

bleaching your hair, lighting a match, and letting fruit rot.

Explanation:

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.