What did Democritus teach?

A that all matter was composed of tiny atoms

B that all mater was composed of earth, fire, water, and air

C that atoms could be divided into smaller particles

D that experiments should be done in a systematic way

Why is an extraction a useful method of "pre-purification" of organic compounds? what physical properties does the process rely on?

Alkanes are hydrocarbons that contain what type of bonds? A) Single covalent bonds only B) At least one double bond C) At least one triple bond D) Ionic bonds

Homogeneous mixtures

What form of the ideal gas law would you use to calculate the number of moles of a gas? A. T = pv nR B. n = PV RT C. v = nRT p D. p = nRT v

Which choice is not true of a liquid in a glass capillary with a convex meniscus? Which choice is not true of a liquid in a glass capillary with a convex meniscus? The liquid has strong cohesive forces.

What causes an increase in the average global temperature?

Which of the following is true regarding nuclear fission and nuclear fusion? A. Both of these processes can provide energy. B. Our sun's heat is an example of both of these processes. C. Both of these processes are equally complex to control. D.

It takes 5.2 minutes for a 4.0 g sample of francium-210 to decay until only 1.0 g is left. What is the half-life of francium-210? 7.8 minutes 1.3 minutes 2.6 minutes 5.2 minutes

What is the correct orbital diagram for carbon

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