2.68 g of zinc reacts with 120.0 mL of 0.750 M hydrochloric acid, producing 6.28 kJ of heat.  Calculate

You carry out a chemical reaction, and obtain 1.261 grams of product.  The expected yield is 1.855 grams of product.  What is the percent yield of product?

A container contains a gas mixture of 1 mol Ar, 1 mol Kr, 1 mol He and 1 mol Ne.  Which gas particles are hitting the container walls with the most force per collision?

Which of the following is most likely to give the brightest electrolyte demo result when dissolved in water?

Which of the following properties of a substance is intensive?

Which of the following is a valid mole ratio associated with the combustion of pentane?

Complete the following table.  (1 pt each)   Isotopic Notation Atomic Number Mass Number   # protons # neutrons # electrons [atomic1] [mass1] [proton1] [neutron1] [electron1]

Assign oxidation numbers to each atom of the redox equation below (9 pts – 1 pt per ON).  In addition, identify the oxidizing and reducing agents (2 pts – 1 pt per agent). Just list the oxidation numbers in order from left to right in your answer space.  You don’t need to write them as superscripts, and you don’t need to rewrite the entire redox equation over.   4 ClO3-  +  3 N2H4      —–>      6 NO  +  4 Cl-  +  6 H2O  

The pressure of a gas sample is measured with an open-ended manometer containing mercury, with the mercury level on the far side (towards the opening) 13.7 mm higher than the nearer side (towards the gas sample).  If the pressure of the gas sample is 787.5 mm Hg, what is the barometric pressure, in atm?

Which of the following elements is tetratomic in its standard state?