Melissa uses a sunscreen with an spf rating of 20. what does this does this mean?

You now know that [Pb+2] = 0.17 M. Calculate [Cl-]. Refer to equations given in the text to determine the relationship between these ions. 0.17 M 0.26 M 0.34 M 0.51 M

What has occurred when a solid forms out of the mixing of two liquids in a chemical reaction? melting gas formation combustion precipitate formation

What type of rock is the Thornton Quarry made of?

Based on the standard free energies of formation, which of the following reactions represent a feasible way to synthesize the product? A. 2C (s) + H2 (g) →C2H2 (g); ΔG∘f=209.2 kJ/molB. N2 (g) + 3H2 (g) →2NH3 (g); ΔG∘f=-33.30 kJ/molC.

Name the haloalkane that has 7 carbons in a chain, a chlorine on the second carbon, and a bromine on the third carbon.

A man is making chicken noodle soup and has found it to be too salty. What method could he use to make the soup less salty? a. Add equal measured amounts of water to the soup. b. Bring the soup to a boil so that some of the broth evaporates. c.

A solution of H2SO4 (aq) with a molal concentration of 3.97 m has a density of 1.216 g/mL. What is the molar concentration of this solution?

How can you chose values for x when making a table of values representing a real world situation?

If a sample containing 2.50 ml of nitroglycerin (density=1.592g/ml) is detonated, how many total moles of gas are produced?

A helium balloon initially at room temperature is dunked into a bucket of liquid nitrogen (T = 77 K). Which of the following will occur?