3. A 650 mg sample is analyzed and found to contain

51.0 mg of hydrogen. What is the mass percent of

hydrogen in the sample?

Which element would most likely have chemical properties similar to that of fluorine (F) ? Ne N Li Br

Which of the following subshells will fill first in the third energy level? D F P S

Flammability is an example of what? A. chemical property B. physical property C. dangerous substance D. atomic bond

The reagent PCC in dry methylene chloride is successful in the selective oxidation of primary alcohols to aldehydes because A. PCC is a relatively weak oxidizing agent B. primary alcohols cannot oxidize any further C.

How many moles of aluminum do 3.90*1024 aluminum atoms represent?

How much ice at a temperature of - 17.5 ∘C must be dropped into the water so that the final temperature of the system will be 31.0 ∘C?

Why does a gas fill completely the vessel in which it is kept?

Individuals who work full time and those who work part-time enjoy basically the same number of paid leave benefits. True False

There is a large increase in ionization energy between the second and the third ionization energies of a metal. What kind of ion is the metal likely to form? Include the charge in your answer.

Which of the following are true statements about equilibrium systems? For the following reaction at equilibrium: CaCO3 (s) ⇌ CaO (s) + CO2 (g) adding more CaCO3 will shift the equilibrium to the right.