Author: Anonymous

How many valence electrons are in a sodium (Na) atom and a sodium ion (Na⁺)?

How many valence electrons are in a bromine (Br) atom and a bromide ion (Br-)?

How many valence electrons are in a magnesium (Mg) atom and a magnesium ion (Mg²⁺)?

How many lone pairs (nonbonding pairs) does the central atom in the nitrate ion (NO₃⁻) have?

According to the kinetic molecular theory, what happens to gaseous molecules when the temperature of a gas increases?

A gas occupies a volume of 3.0 L at a pressure of 1.5 atm. If the pressure is increased to 3.0 atm at constant temperature, using Boyle’s law, what is the new volume?

What is the term for a reaction that proceeds by requiring heat energy?  N2(g)  + O2(g) + 203 kJ → 2NO(g) 

Which of the following statements best describes the compressibility of gases compared to other physical states?

What is the density of carbon dioxide gas (CO₂) at STP? Molar mass of CO₂ = 44.0 g/mol; 1 mol = 22.4 L (at STP)

What volume of carbon dioxide gas (CO₂) is produced when 56.0 L of methane gas (CH₄) reacts completely with 44.0 L of oxygen gas (O₂) at STP? CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(g) 1 mol = 22.4 L (at STP)