The isotope lead-208 (208Pb) : ___ g/mol The isotope strontium-87 (87Sr) : ___ g/mol

How many electrons does barium have to give up to achieve a noble-gas electron configuration?

For each set of dilutions (bleach and mouthwash), the first tube contained a 1:11 dilution (0.5 mL of agent was added to 5.0 mL of nutrient broth).

Classify each of the following changes as Physical or Chemical: (a) Coal burning (b) ice melting (c) mixing chocolate syrup with milk (d) explosion of a firecraker (e) magnetizing of a screwdriver

Vibrations that move through the ground carrying the energy released during an earthquake are called

Which of the solutions below is a weak electrolyte? nacl (aq) koh (aq) hcl (aq) h2so3 (aq) all of these?

Where does geothermal energy come from? A. sunlight B. the oceans C. the land D. inside Earth E. wind

Dimethylnitrosamine (CH3) 2N2O, is a carcinogenic formed in foods from nitrite ions used as preservatives. Calculate each of the following for this compound. Show all work for full credit. a. molar mass b. What is the % N

Does biomass energy come from petroleum?

What type of bond would occur between carbon (C) and nitrogen (N) ? A. Metallic bond B. Ionic bond C. Paired bond D. Covalent bond

Consider a reaction of chemicals depicted as a + b → c + d. suppose reaction of 21.8 grams of a with 40.7 grams of b gave 31.8 grams of c. however, the theoretical yield of c for this reaction was 49.9 grams.