What occurs when the products have less enthalpy than the reactants?

A. Heat energy is absorbed

B. Heat energy is released

C. The reaction will be complete

D. The reaction will reverse

Which type of radiation travels as an electromagnetic wave? * a) alpha particle b) beta particle c) gamma ray d) X-ray

The hydrogen atomic emission spectrum includes a UV line with a wavelength of 92.3 nm. Is this line associated with a transition between different excited states or between an excited state and the ground state?

Methanol can be synthesized by combining carbon monoxide and hydrogen. co (g) + 2h 2 (g) ch 3oh (g) δ h° rxn = - 90.7 kj a reaction vessel contains these compounds at equilibrium.

Highest ionization energy: Li, Be, B

Based on its location in the periodic table, which of these is a property of nickel? A Low density B Strong semi conductor C Highly reactive with other elements D Good conductor of heat and electricity

10) A screwdriver has the density of 5.5 grams per cubic centimeter. It also has the mass of 2.3 grams. What is the screwdriver's volume?

A chemist weighed out 20.7 g of sodium. Calculate the number of moles of sodium she weighed out

If 1.00 mol of argon is placed in a 0.500-L container at 20.0 ∘C, what is the difference between the ideal pressure (as predicted by the ideal gas law) and the real pressure (as predicted by the van der Waals equation) ? For argon, a=1.

Part 2: Finding Speed and Height Using Energy Directions: Use the KE and GPE equations to solve for speed or height depending on the situation. 1. A 1,000-kg car has 50,000 joules of kinetic energy. What is its speed? 2.

Why is conductivity be the best test to find a metal, non-metal or metalloid?