Chemistry Final S1

A gamma ray has a frequency of 2.88 × 10²¹ Hz. What does this mean

• , indicating it is high-energy electromagnetic radiation.

• , indicating it is low-energy radiation.

• A frequency of 2.88 × 10^21 Hz suggests the gamma ray is visible light.
• The frequency of 2.88 × 10^21 Hz means the gamma ray is a type of sound wave.

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

If a radio station were to increase its frequency from 94.5 MHz to 99.1 MHz, what would happen to the station's wavelength?

• The station's wavelength will fluctuate randomly.
• The station's wavelength will increase.
• The station's wavelength will remain the same.
• The station's wavelength will decrease.

Tags

NGSS.HS-PS4-1

Heating 235 g of water from 22.6°C to 94.4°C in a microwave oven requires 7.06 × 10⁴ J of energy. If the microwave frequency is 2.88 × 10¹⁰ s^-1, how many quanta are required to supply the 7.06 × 10⁴ J?

• 3.69 × 10^27
• 5.67 × 10^25
• 1.20 × 10^28
• 2.45 × 10^26

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Match the following frequencies to the type of EMR.

• Microwave

• X-Ray

• UV

• Gamma

• Radio

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

The Heisenberg uncertainty principle states that ____________.

• it is impossible to simultaneously know both the exact position and exact momentum of a particle.
• it is possible to know both the exact position and exact momentum of a particle simultaneously.
• the position of a particle can be known with absolute certainty.
• the momentum of a particle can be measured without any uncertainty.

What is the primary difference between the 1s and the 2s orbitals?

• The 1s orbital has more angular momentum than the 2s orbital.
• The 1s orbital can hold more electrons than the 2s orbital.
• The 1s orbital is at a lower energy level and closer to the nucleus than the 2s orbital.
• The 2s orbital is filled before the 1s orbital in electron configuration.

What does n represent in the quantum mechanical model of the atom?

• The principal quantum number, indicating the energy level of an electron.
• The angular momentum of an electron.
• The number of protons in the nucleus.
• The distance of the electron from the nucleus.

When one substance changes identity, it exhibits a(n)

• physical change
• state change
• chemical change
• phase change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Match each type substance to the example that best represents it.

• alloy

• Steam

• vapor

• Gold

• Gas

• sterling silver (silver and copper

• element

• Methane

Tags

NGSS.MS-PS1-1

Crushing an a​ aluminum can ​ ​ (a)  
recycling used aluminum cans to make new aluminum cans ​ (b)  

aluminum combining with oxygen to form aluminum oxide​ (c)  

• Physical Change
• Physical change
• chemical change
• Melting process
• Combustion reaction
• Sublimation effect

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5