How many protons are there in the following atom? 235 92 U

235

143

317

92

What is the oxidation half-reaction for Fe (s) + 2HCl (aq) to FeCl2 (aq) + H2 (g) ?

Which is true of the buoyant force? It acts in the upward direction. It acts with the force of gravity. It makes an object feel heavier. It acts in the downward direction.

Which three minerals are usually found in granite? (1) biotite, olivine, and hornblende (2) quartz, pyroxene, and olivine (3) potassium feldspar, quartz, and hornblende (4) plagioclase feldspar, biotite, and pyroxene

All of the atoms of argon have the same? 1. atomic number 2. number of nucleons 3. mass number 4. number of neutrons

Radioactive radon-222 gas (222rn) occurs naturally as a product of uranium decay. the half-life of 222rn is 3.8 days. suppose a flask originally contained 4.0*1013 atoms of 222rn. how many atoms of 222rn will remain after one month (30. days) ?

Density is not a physical property of mass. True False

Does skin have a nucleus true or false

Bacteria are only found in decaying matter. A. True B. False

Which is considered a chemical mutagen? tanning beds tobacco X-rays precious metals

Combining 0.380 mol Fe2O3 with excess carbon produced 13.7 g Fe Fe2O3 + 3C → 2Fe + 3CO What is the actual yield of iron in moles? What is the theoretical yield of iron in moles? What is the percent yield?