State one difference between a reversible change and an irreversible change

Two brothers are digging a drainage ditch for a french drain around their home. The ditch is to be 2 feet deep, 1 foot wide, and 40 feet long. The older brother can dig the ditch in 14 hours. The younger brother can dig the ditch in 17 hours.

If an object has a volume of 5 mL and a mass of 50 g what is the density of the object

In what ways are sound waves and electromagnetic waves different? A. They travel at the same speed B. Electromagnetic waves have a frequency but not a wavelength C. Sound waves have frequency but not wavelength D.

Which term describes the reaction process in a fission reaction? A. Chain reaction B. Critical mass C. Neutron absorption D. Neutron moderation

What is the system of blood and blood vessels and the heart

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?