Balance the following reactions:

Mg(CH:02)2 +K2CO3 →KCH:02 +MgCO
b.
Na +Cu(PO)–Na PO+Cu
c.
Rb +O2→Rb20

Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?

What is the wavelength of a 3*10^12 hz infrared wave a 3*10^20m b 1* 10^4m c 3*10^-3m d 1*10^-4 m

Dumbledore decides to gives a surprise demonstration. he starts with a hydrate of na2co3 which has a mass of 4.31 g before heating. after he heats it he finds the mass of the anhydrous compound is found to be 3.22 g. he asks everyone in class to determine the integer x in the hydrate: na2co3·xh2o; you should do this also. round your answer to the nearest integ