Which of the following sets represents a pair of isotopes?

A. 14C and 14N

B. Br and Br2

C. 9B and 11B

D. 16O and 16O2-

Calculate the mass of sodium acetate (CHaCOONa) required to prepare 50 mL of a 0.10 M sodium acetate solution. Calculate the volume of 1 M sodium hydroxide (NaOH) needed to prepare 10 mLcf a 0.10 M sodium hydroxide solution

An atom is silicon has a mass number of 28 and an atomic number of 14 how many protons and electrons and neutrons does this atom have and what is the election configuration for a silicon atom?

Define empirical formula

Which of the following combines with harmful gases to create air pollution? fertilizers smoke particulates sewage

According to VSEPR theory, the structure of the ammonia molecule, NH3, is A) triagonal planar B) linear C) bent D) triagonal pryramidal

Chemical reactions occur when molecules or atoms collide so that the bonds between atoms break and new bonds form. breaking the bonds of the reactants requires energy; whereas, bond formation releases energy.

Calculate the volume of a 0.323-mol sample of a gas at 265 K and 0.900 atm.

What is the molar mass of the following substance : Cs2CO3

What does the velocity of a wave describe

Sulfur (S) has 16 protons and 16 neutrons. How many electron shells does an element of sulfur have?