Chemistry Chapters 0,1,2

Isotopes have ________

• the same atomic mass.

• the same number of protons but different numbers of electrons.

• the same number of protons but a different number of neutrons.

• the same total number of protons and neutrons.

What is the electron configuration of carbon?

• [He] 2s2 2p4

• 1s2, 2s2, 2p2

• 1s1, 2s2, 2p4

• 1s2, 2s2, 2p6

How many significant figures are in 0.000345?

• 6 sig figs

• 7 sig figs

• 3 sig figs

• 4 sig figs

Calculate the wavelength of a photon that has a frequency of 2.5 x 10^12 Hz?

• Don't know

• 3.34 x 10^7 nm

• 1.2 x 10^4 m

• 6.7 x 10^5 m

What is 250,000 in scientific notation?

• 2.5 x 10^-5

• 2.5 x 10^5

• 2.5 x 10^8

• 2.5 x 10^6

Which is a diatomic molecule?

• CO2

• NO3

• H2O

• O2

Which is untrue about Dalton's Atomic Theory?

• Atoms are indestructible

• Each element is made up of tiny particles

• Chemical compounds are formed when atoms of different elements combine

• Atoms are identical.

How many protons, neutrons and elections does Carbon 14 have?

• 6 : 8 : 6

• 8 : 6 : 6

• 6 : 6 : 8

• 5 : 4 : 5

Say you want to calculate frequency, what formula would you use?

• E = hv

• v = λ x c

• λv = c

• v = c / λ

What is planck's constant?

• h = 6.626 x 10^-34

• h = 2.9979 x 10^-18

• h = 2.178 x 10^18

• h = -2.178 x 10^18