A covalent bond occurs when:

a. Two nonmetal elements share electrons to fill octets

b. An element becomes stable by transferring electrons

C. Two metal elements share electrons

d. none of these

Which of the following rocks is formed by cooling lava? obsidian limestone sandstone marble

When a container is filled with 3 moles of helium gas, 2 moles of oxygen gas, and 1 mole of carbon dioxide gas, the pressure in the container is 786 kPa. What is the partial pressure of the oxygen gas? A. 131 kPa B. 262 kPa C. 393 kPa D. 786 kPa

Find the final concentration of NO3 - in a solution made by combining 0.954 L of 0.140 M Al (NO3) 3 with 0.652 L of 0.430M LiNO3. A) 0.026 M B) 0.052 M C) 0.160 M D) 0.320 M E) 0.639 M

Is fission or fusion used in nuclear power plants? Which is more powerful? Which is a cleaner source of energy? Why do you think one used as an energy source in power plants while the other is not?

Which of the following techniques involves separating volatile chemical into their components? a. UV spectrophotometry b. DNA analysis c. Gas chromatography d. Infrared spectrophotometry

How many moles of CO will be produced, if 32.5grams of H2O are produced? C6H6S+6O2=>6CO+3H2O+SO3

Identify and briefly describe two ecosystems in your community that are beyond schoolyard

Is N2H2 a ionic compound?

What do Lewis dot structures show?

300 grams of a compound which contains only carbon, hydrogen and oxygen is analyzed and found to contain the exact same percentage of carbon as it has oxygen. The percentage of hydrogen is known to be 5.98823%.