Which biomolecule contains hydrogen, oxygen, nitrogen, carbon and phosphorus?

Who invented the thermometer

The atoms in a sample are close together but can slide past one another. As the atoms lose energy, they move slower. The atoms become locked in place because of attractive forces between themwhich change of state is taking place?

Common physical reactions that could be easily confused for a chemical reaction?

A photon has a wavelength of 624 nm. calculate the energy of the photon in joules

Determine the amount of atoms in 5.40g B

If a sample containing 2.50 ml of nitroglycerin (density=1.592g/ml) is detonated, how many total moles of gas are produced?

A helium balloon initially at room temperature is dunked into a bucket of liquid nitrogen (T = 77 K). Which of the following will occur?

Which statements indicate what the fossil record suggests about evolution on Earth? Check all that apply. Humans have only recently existed on Earth. Organisms originally lived only in Earth's water. Life on Earth started when water formed on Earth.

What does homogeneous mixture of elements mean

As an acid is added to neutral water the [OH-] will