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Which of the following pairs are isotopes of each other?

H₂O and D₂O.

¹²₆C and ¹⁴₇N.

¹⁶₈O and ¹⁸₈O.

Na⁺ and Cl⁻.

Which subatomic particle is responsible for the chemical properties of an element?

Nucleus.

Proton.

Neutron.

Electron.

The molar mass of a substance is the mass in grams of __ of that substance.

n moles.

One mole.

Two moles.

Any moles.

What is the primary difference between a chemical change and a physical change?

Physical changes are reversible, chemical changes are not.

Physical changes involve a change in temperature, chemical changes do not.

Chemical changes result in new substances, physical changes do not.

Chemical changes involve a change in state, physical changes do not.

Two natural phenomena that support the kinetic theory of matter are:

Diffusion and Brownian motion.

Rainfall and Diffusion.

Diffusion and Transpiration.

Rainfall and Brownian motion.