If 20 grams of water absorbs 820 joules of heat, what is the temperature change of the water

Explain briefly why oxygen exists as diatonic molecules?

If an object loses electrons it will become negatively charged. True False

The frequencies of visible light are slightly higher than ultraviolet waves. True False

Urbanization is the cause of "urban heat island" a condition that could be described as

What is the density (in g/l) of a gas with a molar mass of 146.06 g/mol at 1.03 atmosphere and 297 k

What is a example of one natural source of radioactivity

Give the coordination number for each metal ion in the following compounds: (a) [Co (CO3) 3]3 - (note that CO32 - is bidentate in this complex) (b) [Cu (NH3) 4]2+ (c) [Co (NH3) 4Br2]2 (SO4) 3 (d) [Pt (NH3) 4][PtCl4] (e) [Cr (en) 3] (NO3) 3 (f) [Pd

A gas contained in a steel tank has a pressure of 1.5 atm at a temperature of 320 K. What will be the gas pressure when the temperature changes to 450 K?

How many ml is in a teaspoon?

In 1987 the first substance to act as a superconductor at a temperature above that of liquid nitrogen (77 k) was discovered. the approximate formula of this substance is yba2cu3o7. calculate the percent composition by mass of this material.