Different elements must have different numbers of what a. all particles b. protons c. electrons d. neutrons

Two atoms must represent the same element if they both have the same:

What are greenhouse gases? a) gases that transmit infrared light b) gases that absorb ultraviolet light c) gases that transmit visible light d) gases that absorb infrared light e) gases that absorb visible light

5. How many significant figures are in the measurement + 0.500 mg? two three four five

Calculate the number of grams of Fe that are produced when 57 grams of FeO is reacted with excess aluminum in the following reaction: 2Al (s) + 3FeO (s) - > 3Fe (s) + Al₂O₃ (s)

Which contains more molecules of water, 4.55 cm3 of ice (0.917 g/cm3) at 0◦C or 4.55 cm3 of liquid water at 0◦C? 1. the ice 2. the liquid? How many more molecules? Answer in units of molec.

Which of these molecules is least likely to form a hydrogen bond with a water molecule

George is writing an essay about the role of observation and inference in the development of the atomic theory. He wants to explain why it was more difficult to observe the presence of neutrons in atoms.

Which pair of statements below is correct? Multiple Choice An octet is formed via ionic bonding when one or more valence electrons are transferred from one atom to another.

If wave A has a frequency of 4.60 x 10^14 s-1, what is the wavelength in nanometers (show your work) ?

What is the mass in grams of 85.32 mL of blood plasma with a density of 1.03 g/mL?