Evaporation is a process that requires energy to occur. Evaporation is a (n) _ reaction.

Tungsten carbide is becoming popular for making jewelry. a chemist is examining a sample of tungsten carbide (chemical formula WC). what is the percent composition of tungsten in this compound? round your answer to the nearest whole percent.

What are the coefficients that will balance the skeleton equation below? n + h ⟶ nh?

Table salt is a refined salt containing about 97 to 99% sodium Chloride iodized salt containing potassium iodide is widely available. Explain why the formula for table salt is NaCI and not NaCI²

What is the family number for helium?

Which move will produce light with the longer wavelength

Identify the spectator ions in the following complete ionic equation. 2k (aq) s2 - (aq) pb2 (aq) 2no-3 (aq) →pbs (s) 2k (aq) 2no-3 (aq) express your answers as ions separated by a comma.

4. A bird left its post and flew in a triangular path. It flew 21 yards south, 72 yards east and 75 yards diagonally to end back at the post. Is it a right triangle?

Condension occurs in the inside of your windows in Winters, why?

How can you use Hess's law to determine a reaction's enthalpy?

7. How much energy in KJ is released when 15.0 g of steam at 100.0 degrees Celsius is condensed and then frozen to ice at 0.0 degrees Celsius?