1. Why do scientists use a common system of measurement?

This is the equation for the dissociation of ammonia gas at 293 K. H = 145 kJ and S = 195 J/k. 2NH3 (g) N2 (g) + 3H2 (g) Which correctly states the G for this dissociation and whether the process is spontaneous or nonspontaneous? Use G = H - TS.

Sodium atom Sodium has an atomic number of 11. Which atom would form an ionic bond with a sodium atom? Select one: a. Helium atom b. chloride atom c. Carbon atom d. oxygen atom

Which statement is true about Hf and HF? (1) both are elements (2) both are compounds (3) both are substances (4) Hf is a compound while HF is an element

What principal quantum number refers to:

Calculate the number of moles of sodium oxide that should be produced with 6.50 g of sodium react with oxygen gas

A cube has a mass of 100 grams and it's density is determined to be 1g/cm^3. The volume of the cube must be

The oxide of titanium, TiO2 is used as a "whitener" in toothpaste. It is obtained from the ore iron (II) titanate, FeTiO3. What is the change, if any, in the oxidation number (oxidation state) of titanium in the reaction

What happened to the mars Climate Orbiter and why? How much money did NASA lose from this incident?

How many bonds are present in HCI? a) 1 b) 3 c) 4 d) 2

Determine the number of moles 1) 20g Na and 2) 34g H2O