The quantum theory of energy levels within atoms was aided by:

study of the sun's light spectrum

emission line spectra of various elements

alpha particles

gamma rays

NaOH and bleach have several characteristics in common. They include all BUT one of the characteristics listed. A) Their pH is less than 7. Eliminate B) They conduct electricity in solution. C) They can be found in cleaning products.

Which is true about the symbols assigned to the elements? A. They are all taken from Latin names. B. They all have two letters. C. They are all recognized internationally.

What is the mass of a 1.00cm3 piece of iron having a density of 7.90g/cm3

A piece of metal is heated, then submerged in cool water. Which statement below describes what happens?

How many liters of plasma are present in 8.5 pt?

How many liters of 0.75 M solution can be made using. 336 moles of lead (II) oxide?

Which molecule, when added to a solution, would give the solution the highest ph? A. HCI B. H2SO4 C. KOH D. H2O

All matter has mass and takes up space. True False

What problems must be overcome before fusion can be used to produce energy? A. synthesizing deuterium and tritium and containing the plasma reactants B. achieving high temperatures and containing the plasma reactants C.

A 50 W engine generates 50 J of energy. How long did it run for? A. 10 s B. 1 s C. 5 s D. 100 s