Which statement about groups in the Periodic Table is correct? A)
All groups contain both metals and nonmetals
B)
Atoms of elements in the same group have the same total number of
electrons
C)
In Group I, reactivity decreases with increasing atomic number
D)
In group VII, the melting point of the elements increases with atomic
number

A30 kg weight lies on top of a massless piston of area a = 0.01 m2 the exterior air is at a (constant) p =1 atm and t = 27 c. the interior gas is 0.4 moles of (ideal) n2 and it has initial temperature 27.00 degrees c. 1. what is the initial pressure in the interior? a. 29.4 kpa b. 130.7 kpa c. 101.3 kpa the next three questions concern what happens when an amount of heat q is slowly added to the interior, raising the piston by 1 mm and raising the interior temperature to 27.40 c

What occurs during a combustion reaction

If you place a magnet under a clear dish, and sprinkle iron fillings over it, above what part of the magnet will most of the fillings gather