a chemical substance that is made up of 2 or more different kinds of atoms that are bonded together
100
exothermic
a kind of chem change that releases heat to its surroundings
100
molecule
a unit of a compound
100
1. compare the elements on the left side of the periodic table to the right
b. left= better conductors of electricity
right = bad conductors of electricity
200
atomic number
# of protons in an atom's nucleus
200
concentration
the relative amount of material in a given volume, area or other substance
200
indication
sign that a reaction is taking place
200
noble gas
elements in column V111 A, they don't react with other elements
200
what is a property of a nonmetal
a. conducts heat well
b. gass @ room temp
c. drawn into wires
d. shiny
b
300
chemical change
a reaction between substances that results in new substances with different chemical properties to be formed
300
conservation of matter
the physical law stating that that matter can't be created r destroyed in chemical reactions; thus the # of particles before and after are equal
300
metal
elements that are on the left side; conduct heat and electricity well
300
nonmetals
on the right side of the taable; poor conductors of heat and electricity
300
3. which element wouldn't combine with another
a noble gas (c) see pg 106
400
chemical formula
letters and numbers tell the types and numbers of of atoms in a single molecule
400
element
a substance that cannot be broken down by simple chem and phys processes
400
metalloid
elements w the properties of metals and nonmetals
400
periodic table
organizes the elements by atomic #
400
see pg 106 (4)
5. see page 106
d
500
chemical property
the characteristic of a substance that describe what will happen when it interacts with other substances
500
endothermic
a type of chem change that absorbs heat energy from its surroundings
500
mixture
a combonation of 2 or more substances in which the chemical properties of the substances do not change
500
proton
reactant
reactivity
saturation
solution
positively charged particle in an atom's nucleus
1 of the original substances in the chem. reaction
the tendency or lack therof of an element to react with other elements
the point at which no more material can be dissolved in a solution
a mixture in which a solute is dissolved by a solvent
500
6. what will best seperate sand and sugar
7. 5 molecules of methane contain 5 carbon atoms and 20 hydrogen atoms. What is the chemical formula
8. see page 107