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a group of individual stars, star systems, star clusters, dust and gas bound together by gravity
a large group of older stars that usually lack sufficient amounts of gas and dust to form new stars
What determines whether a star will form a black hole or a neutron star?
the mass and density of the star during its death
In the Big Bang theory, the universe's beginning size
the universe began with a small amount of matter smaller than the period at the end of this sentence.
knowledge of the universe
scientists have a good idea -- but with further study that idea may change
Life cycle of the average star (like our Sun)
nebula -- protostar -- main sequence star -- red giant -- planetary nebula -- white dwarf -- Black dwarf
what is the possible lifecycle of a super giant star?
Supergiant -- supernova -- neutron star or black hole
a region of space containing so much matter that it collapses into an infinitely dense point.
the dense remnant of a high mass star that has exploded as a supernova which are smaller and denser than white dwarfs.
matter that does not give off radiation. It cannot be seen directly, but its presence can be detected by observing its gravitational effects on visible matter
is a wide belt that extends from Pluto's orbit out to about 100 AU or more from the sun.
a representation of a chemical reaction that uses symbols to show the relationship between the reactants and products
the relative number of moles of the substances required to produce a given amount of product in a chemical reaction
a reaction in which a single compound breaks down to form two or more simpler substances
a reaction in which one element or radical takes the place of another element or radical in a compound
a reaction in which a gas, a solid precipitate, or a molecular compound forms from the apparent exchange of atoms or ions between two compounds
any chemical change in which one species is oxidized (loses electrons) and another species is reduced (gains electrons)
a substance that changes the rate of a chemical reaction without being consumed or changed significantly
a type of protein that speeds up metabolic reaction in plants and animals without being permanently changed or destroyed
a state of balance in which the rate of a forward reaction equals the rate of the reverse reaction and the concentrations of products and reactants remain unchanged
arrangement of elements in columns, based on a set of properties that repeat from row to row
left of the zigzag line, shiny, malleable, ductile, good conductors of electric current, good conductors of thermal energy
elements that are usually dull in appearance, poor conductors of heat and electricity, gases at room temperature
elements that form a bridge between the elements on the left and right side of the periodic table
Theorey that states that all matter is made up of indivisual particles called atoms, which cannot be divided.
Thompson's Model of the Atom
Called the 'plum pudding' model. The atom is a lump of positively charged material with negatively charged electrons scattered in it.
1. All elements are composed of atoms
2. All atoms of the same element have the same mass
3.Compounds contain atoms of more than one element
4.In a particular compound, atoms of diffrent elements always combine in the same way.
The constant motion of particles in a gas allows a gas to fill a container of any shape or size
The volume of a gas is directly proportional to its temperature in kelvins if the pressure and the number of particles of the gas are constant
The volume of a gas in inversely proportional to its pressure if the temperature and the number of particls are constant
Combined Gas Law
The relationship among the temperature, volume, and pressure of a gas when the number of particles are constant
The reversible physical change that occurs when a substance changes from one state of matter to antoher
Occurs when a substance reacts with another substance forming one or more new substances.
Contains some particles that are intermediate in size between the small particles in a solution and the larger particles in a suspension.
A substance that is made from two or more simpler substances and can be broken down into those simpler substances.
The substances are so evenly distributed that it is difficult to distinguish one substance in the mixture from another.
When a substance undergoes a change of state and/or shape, but the chemical properties remain the same.
Any characteristic of a material that can be observed or measured without changing the composition of the substance.
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