Electromagnetic waves of various frequencies reach earth from distant parts of the universe. Which of the following can be inferred from this?

When the kinetic energy of particles in a substance decreases, what also decreases? а) The substance's temperature. b) The size of the particles in the substance. c) The number of particles in the substance. d) The substance's specific heat.

A chemist weighed out 101. g of sodium. Calculate the number of moles of sodium she weighed out.

Which of these is an ionic compound? A NO2 B LiCl C SO3 D CO

Silicon has three naturally occurring isotopes (Si-28, Si-29, and Si-30). The atomic mass and natural abundance of Si-28 are 27.9769 amu and 92.2 %, respectively. The atomic mass and natural abundance of Si-29 are 28.9765 amu and 4.

Sodium in Water A piece of ice melts and reacts with sodium. Is this a physical or chemical change, or both? Explain your answer in the description section A. Physical change B. Chemical change C. Both

What is number 16 on the periodic table

What is the strongest intermolecular force

If a sample of hydrochloric acid is neutralized with sodium hydroxide, what products are formed?

Prior to the development of DNA fingerprinting, blood type could be used to determine possible parentage. Although it might prove someone was not a parent, it could not show if someone was positively the parent, only that he or she might be a parent.

At room temperature, which of the following is the most compressible? A. One liter of oxygen, a gas B. One liter of water, a liquid C. One liter of mercury, a liquid D. One liter of iron, a solid