In the reaction C7H16 + __O2 → 8H2O + 7CO2, what coefficient should be placed in front of O2 to balance the reaction?

7

8

11

no coefficient is needed

Determine the mass in grams of 1.35 mol Fe

Describe the chemical reaction of: NH3 (g) + O2 (g) - > NO (g) + H2O

What is generally true about the particles in a gas? Gas particles are closer together and have stronger attraction between them than the particles in a solid.

Which substance was developed by chemists? A) silk B) nylon D) aspirin

Which elements likely conduct electricity well? Check all that apply. chromium iodine carbon calcium osmium

Why do cells have a plasma membrane? A. to separate protein from the nucleus B. to distinguish plants from animals C. to define the size of the cell D. to separate the inside of the cell from its enviroment

Base on its molecular mass, what is the molar mass of iron

For the following reaction in aqueous solution, identify all those species that will be spectator ions. Select all that apply. Na, SO4+Hg (NO3) 2HSO4+2NaNO3 Choose one or more: A. Hg2S04 B. Na2S04 C. Nat D. NO3 E. SO42- F. Hg2 (NO3) 2 G. NaNO3 H.

One mole of which hydrocarbon requires 8 mol o2 to achieve complete combustion to give carbon dioxide and water?

How many bromine atoms are present in 39.9 g of CH2Br2