SDSMT Chem 112 Test 2 study questions

Define frequency as it relates to a electromagnetic wave.

• Frequency is the distance between two consecutive peaks or troughs in a wave

• Frequency corresponds to the magnitude of a wave's height

• Frequency is the number of wave cycles that pass in a specified point in time

• Frequency corresponds to how many coffees per hour

Tags

NGSS.HS-PS4-1

What is the wavelength (in nm) of a photon if the energy is 7.26 × 10⁻¹⁹ J? (h = 6.626 × 10⁻³⁴ J • s)

• 676 nm

• 274 nm

• 424 nm

• 548 nm

Tags

NGSS.HS-PS4-1

The green light emitted by a stoplight has a wavelength of 505 nm. What is the frequency of this photon? (c = 3.00 × 10⁸ m/s).

• 5.94 x 10¹⁴ Hz

• 3.59 x 10¹⁴ Hz

• 5.94 x 10¹² Hz

• 3.59 x 10¹² Hz

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NGSS.HS-PS4-1

 A lone pair is defined as

• A pair of bonding electrons
• One non-bonding electron
• A pair of non-bonding electrons
• A pair of electrons on the central atom

Which molecule would have this molecular geometry?

• BF₃
• CH₄
• PCl₅
• CO₂

What is the VSEPR theory used to predict?

• Bond Strength
• Polarity
• Molecular Shape
• Electronegativity

Which of the following shapes has an unshared pairs of electrons on the central atom? 

• Bipyramidal
• Bent
• Trigonal Planar
• Tetrahedral

Who could this molecule be?

• CH₄
• CO₂
• PCl₅
• BF₃

Tags

NGSS.HS-PS1-1

According to VSEPR, molecules adjust their shapes to keep which of the following as far away as possible?

• Pairs of valence electrons
• Inner shell electrons
• Mobile Electrons
• Electrons closest to the nucleus

What molecule could this be? 

• BF₃
• CH₄
• H₂O
• CO₂

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2