Which element has the highest electronegativity on the Pauling scale?
B. Fluorine
Fluorine has a value of 3.98, the highest of all elements.
At constant temperature, the pressure of a fixed mass of gas is inversely proportional to its volume. This is the statement of:
A. Boyle's law
Boyle's law: PV = constant at constant temperature.
What is the hybridization of carbon atoms in ethene (C2H4)?
D. sp2
Each carbon forms three sigma bonds and one pi bond, so it is sp2 hybridized.
What is the pH of a 0.01 M solution of HCl?
C. 2
HCl is a strong acid: [H+] = 10^-2 M, so pH = −log(10^-2) = 2.
How many moles are present in 36 g of water? (H = 1, O = 16)
A. 2 mol
Molar mass of H2O = 18 g/mol; moles = 36 / 18 = 2.