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