Are all elements abbreviated with one or two letters?

Sodium, atomic number 11, forms an ionic bond with an atom of an unknown element. what is one possible choice for the other element in the compound?

The relationship between molecular velocities and temperature is a ___relationship. indirect direct inversely proportional secondary

The air pollutant emitted by burning coal includes which of the following? A. sulfur oxides B. nitrogen oxides C. ozone D. carbon monoxide E. none of the above

Why does the rate of most reactions decrease over time? A) A decrease in reactant concentration reduces the frequency of successful collisions. B) A decrease in temperature reduces the average kinetic energy of the particles.

CH3-C (CH3) = CH-CH=CH2 + HBr->?

In a closed system, the total heat given off by warmer substances equals the total heat energy gained by cooler substances (qwater = - qliquid).

What compound will not give oxygen on heating

Choose one property of water that makes it unique. Describe the property and explain the chemical or physical?

An object is dropped onto the moon (g m = 5 ft/s 2). how long does it take to fall from an elevation of 250 ft.?

Which type of luster gives the mineral the appearance of metal?