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:

answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.