Universe Review Guide
Describe the properties of metals
- conductive, malleable, luster, high density and melting point
at what temperature range do pure substances melt
0.1degCelses
CI2
Chlorine,ionic
Who discovered galaxies are moving away from us?
Edwin Hubble
Radiation left over from the big bang is called
cosmic background radiation
chemical name H2
hydrogen,covalent
When did the Big Bang occur?
14 billion years ago
Compare and contrast homogeneous and heterogeneous
A homogeneous mixture has the same uniform appearance and composition throughout. Many homogeneous mixtures are commonly referred to as solutions. A heterogeneous mixture consists of visibly different substances or phases. The three phases or states of matter are gas, liquid, and solid.
What is a galaxy?
A large collection of billions of stars
What is a pure substance?
A sample of matter, either a single element or a single compound, that has definite chemical and physical properties
What are the properties of an elliptical galaxy?
An elliptical galaxy is a type of galaxy having an approximately ellipsoidal shape and a smooth, nearly featureless image. Unlike flat spiral galaxies with organization and structure, elliptical galaxies are more three-dimensional, without much structure, and their stars are in somewhat random orbits around the center.
What is dark matter?
An unknown substance which holds galaxies together, but doesn't emit any electromagnetic radiation
. How is the universe like blowing up a balloon?
Because it is expanding
The initial explosion that resulted in the formation and expansion of the universe is called the
Big Bang Therory
What did Edwin Hubble observe?
Edwin P. Hubble revolutionized cosmology by proving that the clouds of light astronomers saw in the night sky were actually other galaxies beyond our Milky Way. His greatest discovery was in 1929, when he identified the relationship between a galaxy's distance and the speed with which it is moving.
Why are Nebulas found in spiral galaxies but not found in elliptical galaxies?
Elliptical Galaxies. Elliptical galaxies are roughly egg-shaped (ellipsoidal or ovoid) found largely in galaxy clusters and smaller compact groups. Most ellipticals contain older, low-mass stars, and because they lack a great deal of star-making gas and dust clouds, there is little new star formation occurring in them.
What are galaxies primarily made of?
Elliptical galaxies are shaped like ellipses (stretched circles). They are divided into eight types: E0-E7 depending on how elliptical they are. E0 ellipticals are nearly circular, while E7s are very stretched out. Elliptical galaxies are made up of mostly old stars, and do not have much gas and dust.
What is dark energy?
It's responsible for the accelerated expansion of the universe
what does it mean for a substance to be malleable
Malleability is the ability of a substance, usually a metal, to be deformed or molded into a different shape. For chemists, the malleability of the metal gives an important means of describing the specific characteristics of a metal and relating it to the arrangement of the atoms within the metal.
. Where is our solar system in our galaxy?
Our local Orion Arm of the Milky Way is some 3,500 light years across. It's approximately 10,000 light years in length. Our sun, the Earth, and all the other planets in our solar system reside within this Orion Arm. We're located close to the inner rim of this spiral arm, about halfway along its length.
describe the properties of metaloids
Properties. Metalloids usually look like metals but behave largely like nonmetals. Physically, they are shiny, brittle solids with intermediate to relatively good electrical conductivity and the electronic band structure of a semimetal or semiconductor.
What are the properties of a spiral galaxy?
Property Spirals - Barred Spirals Color Bluish (disk), reddish (halo and nucleus) Neutral gas (fraction of mass) 5 % Gas and Dust Disks contain substantial amounts of gas and dust; halos contain little of either. Star formation Ongoing star formation in spiral arms. 6 more rows Galaxy Properties
What are the properties of an irregular galaxy?
Property Spirals - Barred Spirals Irregulars Neutral gas (fraction of mass) 5 % 15 % Gas and Dust Disks contain substantial amounts of gas and dust; halos contain little of either. Very abundant in gas and dust. Star formation Ongoing star formation in spiral arms. Vigorous ongoing star formation. 7 more rows
Compare and contrast blue and red shift (how are they different, how are they alike).
Redshift and blueshift describe how light shifts toward shorter or longer wavelengths as objects in space (such as stars or galaxies) move closer or farther away from us. ... When an object moves away from us, the light is shifted to the red end of the spectrum, as its wavelengths get longer.
What type of matter is heterogenous and homogenous fall under
The difference between heterogeneous and homogeneous mixtures is the degree to which the materials are mixed together and the uniformity of their composition.
What is the charge of an iron atom with 24 electrons
The element whose atoms have 26 protons (atomic number 26) is Fe (iron). The mass number of this isotope is 26 + 30 = 56 (the sum of the protons and neutrons). Because the ion has two more protons than electrons, it has a net charge of 2+. Thus, the complete symbol for the io
What is name of our galaxy and what type of galaxy is it?
The term "Milky Way", a term which emerged in Classical Antiquity to describe the band of light in the night sky, has since gone on to become the name for our galaxy. Like many others in the known Universe, the Milky Way is a barred, spiral galaxy that is part of the Local Group - a collection of 54 galaxies
What part of the electromagnetic spectrum can we see?
The visible spectrum is the portion of the electromagnetic spectrum that is visible to the human eye. Electromagnetic radiation in this range of wavelengths is called visible light or simply light. A typical human eye will respond to wavelengths from about 390 to 700 nanometers.
What are the three different types of galaxies?
There are three main types of galaxies: Elliptical, Spiral, and Irregular. Two of these three types are further divided and classified into a system that is now known the tuning fork diagram
Describe the properties of nonmetals
They are generally poor conductors of heat and electricity. Solid nonmetals are generally brittle, with little or no metallic luster. Most nonmetals have the ability to gain electrons easily. Nonmetals display a wide range of chemical properties and reactivities
True or false? The farther away a galaxy is from us, the faster it is moving away from us.
True
. Explain Hubble's Law
When blueshift is expanding and redshift is moving closer
How can astronomers determine how long the universe has been expanding?
by the stars
. If a galaxy is moving toward Earth wavelengths get _________ and show what type of shift? _______________
closer,redshift
. As a galaxies move away from Earth wavelengths get _________ and show what type of shift?_____________
expanded,blueshift
What Direction does energy move
hot to cold
Draw a eliptical galaxy
its the other image(Not an image to show)
MgI2
magnesium iodide,covalent
CH4
methane,covalent
PF
peak flow,ionic
H20
water,ionic
