Unit 1 Midterm Review

Which of the following is true?

• Protons and electrons are the same size

• Th number of protons and neutrons must equal

• most of the atom is empty space

• Electrons determine what element it is

Tags

NGSS.MS-PS1-1

What is (3x10^-4)( 4x 10^-5) / (2 x 10^-5)

• 6 x 10^-4

• 8 x 10^-4

• 6 x 10^-5

• 5 x 10 ^-9

Which of the following is going to have the largest error when rounding?

• 19.0 g/mol

• 35.5 g/mol

• 89.9 g/mol

• 123.8g/mol

There are 2.2 pounds in a kilogram and 16 ounces in a pound. Express 22 pounds in mks units.

• 22 pounds

• 160 ounce

• 10 kg

• 48 kg

What is the correct order for decreasing energy?

• Microwaves, visible light, ultraviolet light, x-rays, g-rays
  

• Microwaves, x-rays, g-rays, visible light, ultraviolet light

• Microwaves, ultraviolet light, visible light, x-rays, g-rays

• g- rays, x-rays, ultraviolet light, visible light, microwaves

Tags

NGSS.HS-PS4-1

If a photons wavelength is 333 nm, what is the energy?

• 4.40 x 10 ^-37 J

• 6.00 x 10 ^-22 J

• 4.40 x 10 ^-40 J

• 6.00 x 10 ^-19 J

Tags

NGSS.HS-PS4-1

When a molecule absorbs a photon of microwaves

• It begins to rotate

• It begins to vibrate

• The electrons are excited to higher energy levels

• The nucleus begins to break apart

Given what you know about the photoelectric effect, what occurs when 10 photons of 4 eV
light strike a metal surface that has a 6 eV work function?

• Nothing happens

• 10 electrons are ejected from the metal

• 5 electrons are ejected from the metal

• 10 photons are ejected from the metal

Tags

NGSS.HS-PS3-1

NGSS.HS-PS4-3

NGSS.HS-PS4-4

For a Bohr atom, which of the following transitions emits the highest energy of photon?

• From n=10 to n= 8

• From n=4 to n=3

• From n=6 to n =5

• From n=2 to n=1

Which of the following emission lines corresponds to the part of the Lyman Series of lines in the spectrum of a hydrogen atom

• n =2 to n=1

• n = 4 to n = 2

• n= 4 to n = 3

• n= 3 to n = 2

Tags

NGSS.HS-PS4-3