What is the oxidation number of tin (Sn) in the compound Na2SnO2? A. - 2 B. 0 C. + 2 D. + 3

Which statement most accurately describes the behavior of a catalyst? (A) A catalyst increases the ∆G of a reaction and hence the forward rate. (B) A catalyst reduces the ∆H of a reaction and hence the temperature needed to produce products.

Which would have a greater molar mass, carbon monoxide or carbon dioxide? why?

Find the mass of 250.0mL of benezene. The density of benezene is 0.8765 g/mL

What chemical is discovered to react to light in the 1700s?

Why is the presence of a dipole in a molecule so important?

The molar heats of fusion and sublimation of molecular iodineare 15.27 kJ/mol and 62.30 kJ/mol, respectively. Estimate the molarheat of vaporization of liquid Iodine.

Light, x-rays, microwaves, and radio waves are examples of which type of energy?

Which of the following is a natural material? cement A) cement B) cotton C) polyester D) nylon

Which of the following would be the best conductor of heat energy? a plastic spoon a wooden spoon a metal spoon

J. J thomsons experiment disproved the theory that an atom A) is divisible B) is indivisible C) contains protons D) contains electrons