1. Which of the following pairs of atoms are isotopes?

a) K-39 and K-40

c) C-12 and N-14

b) F-10 and Ne-10

d) H-2 and He-2

Which of the following is a postulate of the kinetic-molecular theory? A. Gases are made up of particles that act like small, soft spheres that are always moving in a calculated fashion. B.

Which statements describe the law of conservation of charge? Check all that apply. A. The total charge of the reactants and products must be equal. B. The net charge of an isolated system remains constant. C. The number of nucleons is constant. D.

A molecular compound is formed when a chemical reaction occurs between atoms of (1) chlorine and sodium (2) chlorine and yttrium (3) oxygen and hydrogen (4) oxygen and magnesium

Choose the TRUE statement. A. Mass is another word for inertia. B. Weight is another word for mass. C. The mass of an object can be measured by its inertia. D. The weight of an object can be measured by its volume.

Which action do reactant molecules perform when they create chemical reactions?

Peter is 5 ft, 11 inches tall. Paul is 176 cm tall. Who is taller?

Which is the MOST accurate description about how the different types of feedback mechanisms work

What was one of the main benefits to the use of the icebox for cooling food?

How many moles of chlorine gas would occupy a volume of 35.5 L at a pressure of 0.98 atm and a temperature of 373 K?

What are the building blocks