Given the following reactionsN2 (g) + 2O2 (g) → 2NO2 (g)ΔH = 66.4 kJ 2NO (g) + O2 (g) → 2NO2 (g) ΔH = -114.2 kJthe enthalpy of the reaction of the nitrogen to produce nitric oxide N2 (g) + O2 (g) → 2NO (g)is ________ kJ.

How many grams of sodium chloride are there in 55.0 mL of a 1.90 M aqueous solution of sodium chloride?

How many moles of CaCl2 are formed in the neutralization of 138 mL of 0.352 M Ca(OH)2 with aqueous HCl?

Balance the equation below.  List the coefficients (separate by commas) C7H16 + O2 → CO2 + H2O

Reflect on your learning experience so far. Then, in a paragraph, discuss 1) what you find most challenging in this class,  2) what you need to do to get more out of this class, 3) how can we help you.

In a brief paragraph, describes what are the most common types of malpractice that lead to research misconduct, and explain what are the two ethical pillars proposed by the American Physical Society.

Mark all the correct answers. A car accelerates (i.e. changes its velocity over time) when

Copernicus’ heliocentric model (as opposed to Ptolemy’s geocentric model) was not immediately accepted by astronomers because …

Match each physical quantity with its definition.

If a person is lying, the polygraph can pick up the following changes in his or her physiological functions EXCEPT: