Ammonia is made up of nitrogen and hydrogen. Nitrogen is in Group 15 of the periodic table, and hydrogen is in Group 1. Which statement about the bonds in a molecule of ammonia is correct? Each nitrogen atom is bonded to two hydrogen atoms.

Each hydrogen atom is bonded to two nitrogen atoms.

Each nitrogen atom is bonded to three hydrogen atoms.

Each hydrogen atom is bonded to three nitrogen atoms.

The polymer used for the nonstick surface of cooking utensils is 24.0%c and 76%f by mass. what is the empirical formula of this polymer?

Answer asap need to be answered by wednesday morning explain how a buffer works, using an ethanoic acid / sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.

At stp, which substance is the best conductor of electricity? a. nitrogen b. neon c. sulfur d. silver