Which of the following is a chemical change?
a. cutting
b. melting
c. rusting
d. bending

Earth's axis of rotation is tilted at an angle of 23.5 degrees. what is one change you would see on earth if its axis was not tilted?

An atom of lithium-7 has an equal number of(1) electrons and neutrons(2) electrons and protons(3) positrons and neutrons(4) positrons and protons

How does the presence of oxygen affect the chemical pathways used to extract energy from glucose?