Using a periodic table, answer the following question: Which series of elements have the same number of valence electrons?
A. Sn, Pb, F, I
B. Ca, Sr, Cu, Ag
C. Na, Mg, Si, B
D. N, P, Sb, Bi

1. calculate the approximate enthalpy of the reaction in joules. estimate that 1.0 ml of vinegar has the same thermal mass as 1.0 ml of water. iqnore the thermal mass of th sodium bicarbonate. note: it takes about 4.2 joules () to change 1.0 gram (1.0ml) of water 1.0 c

What energy is it when you flip on a switch on a lamp

What is the approximate vapor pressure when the gas condenses at 70 degrees celsius