Which option correctly describes the enthalpy of formation?

Why is the atomic mass for Calcium a decimal?

A sample of helium gas has a volume of 0.180L, a pressure of 0.800a and a temperature of 29 C. What is the new temp or gas of volume of 90mL and pressure of 3.20 atm

Medeleleev arranged the known chemical elements in a table according to increasing ... A) atomic number b) number of electrons c) number of protons d) mass

How long will it take for 90% of the ch3cn to convert to ch3nc?

Calculate the resulting ph obtained by mixing 16.5 g hcl and 22.6 g nacl in water to create 482 l solution.

What should I do for the science fair?

Which compounds yield hydrogen ions as the only positive ions in an aqueous solution? (1) H2CO3 and HC2H3O2 (2) H2CO3 and NaHCO3 (3) NH3 and HC2H3O2 (4) NH3 and NaHCO3

4. How does the kinetic theory of gases explain the weather changes happening in the troposphere? You can also research on the Internet using keywords such as troposphere, atmospheric layers, and weather changes.

Is the earth older than any of they rock layers

What will be the charge of sulfur