Test 4: chapters 7 and 8 Flashcards
Why is the quantum-mechanical model of the atom imortant for understanding chmeistry?
It’s important because it explains the behavior or particles, such as photons and electrons, in the atomic and subatomic realms
What is light? How fast does it travel in a vaccum?
Light is eltromangetic radiation, a type of energy embodied in oscillating electric and magnetic fields. It travels at 3.00x10^8 m/s
Define the wavelength and amplitude of a wave. How are these related to the energy of the wave?
Amplitude- the verticle height of a crest or depth of a trough.
Wavelength- the distance between two adjacent crest/trough, measured in units such as meters, micrometers, or nanometers
Depending on the distance that a wavelength covers with the height of the amplitude, the amount of engergy produced will be determined
Define the frequency of electromagnetic radiation. How is frequency related to wavelength?
The frequency of elctromagnetic readition is directly proportional to its wavelength, thus waves go from a lowest energy to the higest. Ex. Radio waves has the lowest energy whereas Gamma rays have the highest energy.
What determines the color of light? Describe the difference between red light and blue light.
For visible light- the wavelength determines the color. Red light has a wavelength of about 750 nanometers(nm), and has the longest wavelength of visble light. Blue light has a wavelength 450 nanometers(nm), and the second shortest wavelength.
What determines the color of a colored object?
The refraction of a certain light that the object doesn’t absorb will be the color that we see.
What determines the color of a colored object? Explain why grass appears green.
The refraction of a certain light that the object doesn’t absorb will be the color that we see. We see the color green because every color but green gets absorbed by the object, therefore the object looks green
What is the quantum-mechanical model?
A model that explains the behaviors of electrons and why they exist in atoms
What’s a wavelength?
The distance between two adjacent crests (or trough) that is measured in meters, millimeters, and nanometers
What’s amplitude?
The vertical height of a crest (or depth of a trough) of a wavelength
What’s frequency?
the number of cycles( wave crest) that pass through a stationary point in a given period of time
What is the electromagnetic spectrum?
the range of the wavelengths of all possible electromagnetic radiation
What’s electromagnetic radiation?
form of energy embodied in oscillating electric and magnetic fields
What are the types of electromagnetic radiation?
Radio waves- longest electromagnetic wavelength which transmit signals responsible for AM/FM radio, TV, cell phone, etc
Microwaves: 2nd longest electromagnetic wavelength that’s used in ovens and radars
infrared radiation: electromagnetic radiation emitted from warm objects
visible light: electromagnetic light that can be seen
ultraviolet(UV) rays: THE SUUUUUUN!!
X-rays: 2nd shortest electromagnetic radiation that blocks visible light, used to see bones and organs
gamma ray: the shortest wavelength, EXTREMELY DANGEROUS
energy
the ability to do work
