Is chalk a compound or a element

If you slow the motion of water molecules down, they are more likely to become

A battery applies 45 volts to a circuit, while an ammeter reads 10 ma. later, the ammeter reading drops to 7 ma. assuming the resistance has not changed, the voltage must have

If the energy of a photon is 1.32 * 10¯18 j, what is its wavelength in nm? a. 1.50 * 10¯7 nm b. 150. nm c. 1.99 * 1015 nm d. 1.99 * 1024 nm e. none of these choices is correct.

A crane raises a 150 N weight to a height of 2.0 m in in 5.0 s. The crane does work at a rate of

Ice sheet movement rates have varied from about 50 to 320 meters per year for the margins of the ice sheet advancing from the hudson bay region during the ice age.

Which would react chemically by forming an ionic bond? A. 2 chlorine atoms with 7 valence electrons each B. 1 neon atom with 8 valence electrons and 1 lithium atom with 1 valence electron C.

Which of these are considered an oxidizing mutagenic agent? x-rays benzopyrene gamma rays

5. A B note has a frequency of 493.88 Hz. Calculate its wavelength in meters.

When one of the electrons of a particular atom undergoes a transition to a quantum state of lower energy, it a) collides with another of its electrons b) exchanges quantum states with another of its electrons c) undergoes a transition to a quantum

What's the symbol for an ionized bromine atom?