Are pure substances homogeneous or heterogeneous

When chromium loses two electrons, its configuration changes to A. [Ar]4s13d5. B. [Ar]3d4. C. [Ar]4s13d4. D. [Ar]4s1.

Which statement best describes the formation of h20 (g) ?

Some of the characteristics that make a good index fossil are: A. the organism lived over a wide area. B. They lived for long periods of time. C. They lived for fairly short periods of time. D. The organism was in abundance.

How many days pass between the minimum and maximum of the tidal range in any giving area?

During a canoe race, a camper paddles a distance of 406 meters in 70 seconds. what's the average speed of the race?

What moves in or out of a substance during a change of state?

2.5 moles of sodium chloride is dissolved to make 0.050 liters of solution

2. The minimized structure of phenacetin is planar, and the chemical shifts of the aromatic protons in the NMR spectrum can be rationalized by electron delocalization.

Altering the pressure of a system can affect the rate of a chemical reaction. true false

What does ice cream melt on a hot day which type of thermal energy transfer does this melting represents