Which correctly pairs the element with its effective nuclear charge? (A) K, +2 (B) K, +4 (C) Cs, +1 (D) Cs, +6

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

Which is the layer underground where all empty spaces are filled with a combination of air and water ?

How does the principle of electromagnetism explain the interaction between earth’s magnetic field and the solar wind?