What does every chemical reaction involve?

A change in concentration.

A change in mass.

A change in state.

A change in energy.

Which of these is a good example of Newton's First Law of inertia A) a ball sits motionless on the ground B) a ball gathers speed as it rolls downhill C) a ball accelerates as it falls out of the classroom window Eliminate D) a ball slows down after

What structure in plants allows them to perform photosynthesis? In science

How many significant figures are in 8790.9

Which is a element of the atoms

How does natural gas affect the way humans live

Which civilization formed a confederation thay may have impacted the us government A. Powhatan B. Algonquian C. Iroquois D. Anasazi

Jasmine breathed against the window pane and noticed that her breath made a spot on it from the water vapor in her breath. Which stage of the water cycle does this show? A. precipitation B. evaporation C. condensation D. transpiration

Amber has developed a line of organic lotions and handmade soaps with unique, herb-based scents and a touch of bee balm. She plans to sell these products to the wealthy residents of a nearby resort town.

Two pure elements react to form a compound. One element is an alkali metal, X, and the other element is a halogen, Z. Which of the following is the most valid scientific claim that can be made about the compound? a. It has the formula XZ2 b.

Are protons positive and neutrons neutral