Draw all the benzoin condensation products that can be formed when a mixture of 1 mole of benzaldehyde and 1 mole of p-methoxybenzaldehyde is treated with sodium cyanide.

Skills of homo sapiens were found an excavation. the skulls were preserved because the bodies were frozen. so, these fossils are (blank) fossils.the image shows the evolution of skulls beginning 2 to 3 million years ago. based on the image, modern human skulls(blank) ape skulls.

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.

What does the symbol (–hfus) indicate in a phase change?