Observing God's World, Test 10, chapter 6
combustion
the rapid reaction of any substance with oxygen
halogens
highly reactive elements that tend to form compounds with alkali and alkaline earth metals
density
the amount of matter in one unit of volume
noble gases
the elements which do not combine with anything else except under unusual circumstances
positive
the proton has what kind of charge?
hydrogen
the simplest kind of atom with one proton and one electron
metals, nonmetals, semimetals
the three main groups of elements
chemical reaction
a process in which atoms of elements or compounds are rearranged to form new substances.
mass
the amount of matter that makes up an object
mercury
The only metal that is liquid at room temperature
silicon
The semimetal that is used to make computer chips
weight
The ____________ of an object changes from place to place
nitrogen
The colorless, odorless gas that makes up 78% of the earth's atmosphere
lead
The densest of the everyday metals
carbon
The element that is the basic building block of all the compound
ionic compound
a compound made of charged atoms
chemistry
the study of what substances are made of and how one substance can be changed into another
nucleus
the tiny, extremely dense core at the center of an atom
more
If two objects have the same volume but different densities, the object made of the denser substance weighs ( more , less)
iodine
The halogen that is added to table salt to prevent a deficiency disease
flourine
The halogen that is added to toothpaste and drinking water
matter
anything that takes up space and has mass
electrons
the tiny particles that swarm at tremendous spees
protons, neutrons
the two particles that make up the nucleus of an atom
molecule
two or more atoms firmly bound together form a __________
shell
formed by electrons that are in orbit the same distance from the nucleus
molecular compound
a compound made of molecules
electron cloud
formed by electrons zooming around the nucleus of an atom
diamond
the hardest of all known substances
solid
most metals are a) solid, b)liquid, c)gas
attract
two electrons ______ each other- (repel or attract?)
atomic number
the number of protons an atom has
weight
the measure of the pull of gravity on an object
equal
a neutral atom has an __________ number of protons and electrons
oxygen
the most abundant element at the surface of the earth
compound
a substance composed of one or more types of atoms bonded together
nickel
A very hard metal which is an important ingredient in stainless steel
element
a substance that is composed of only one type of atom
sublimes
Iodine, when heated, does not melt but instead _______, or turns to gas.
neutral
lacking an electrical charge
chlorine
the halogen that is useful as a bleach and a germ-killing agent
gram or kilograms
the metric unit that is used to measure an object's mass
periodic table of the elements
the organized arrangement of all known elements
atoms
the tiny particles of which all matter is composed