The chemical change process whereby a molecule breaks down into simpler molecules or elements is called:
decomposition
endothermic
exothermic
a phase change

Which substances have the lowest melting points: ionic covalent, or metallic

Pls! plant cells and animal cells were observed under a microscope. the characteristics of two cells are listed below. cell p: does not capture sunlight cell q: has cytoplasm but no chloroplast which statement about the two cells is correct? cell q also has a cell wall. cell q also has large vacuole. cell p also has a large vacuole. cell p also has a cell membrane.

How many moles of air are there in a human lung with a volume of 2.4 l at stp? explain your answer