Chem Test 1
Terms in this set (32)
The study of matter and energy
Anything that has mass and occupies space
are the simplest form of matter that has distinct physical and chemical properties and cannot be broken down chemically into simpler, stable substances
is the smallest amount of an element that still has the characteristics of that element
hold the atoms together. These bonds can then be broken and new bonds formed with different atoms
is a chemical combination of elements that has its own set of properties and a definite composition.
elements and compounds
composed of different kinds, diverse (chicken soup)
of the same kind; alike (vodka)
which are the characteristics by which something can be identified
Properties that describe or identify a substance without changing its chemical composition, such as color, melting point, and conductivity
The characteristic chemical reactions a substance undergoes are its
Properties that depend on the amount of substance present
(mass and volume)
Properties that are the same regardless of sample size (Density, color, melting point)
Law of conservation of mass
states that in any chemical reaction or physical change, the total mass present after the change is equal to the total mass present before the change
Length, mass, time, electric current, temperature, amount of substance, and luminous intensity
SI unit of length
SI unit of mass
Rules for significant figures
•All nonzero numbers in a properly reported measurement are significant.
•Any zeros to the left of all nonzero digits are not significant; 0.03 contains only one significant digit.
•Any zeros between significant digits are significant; 903 contains three significant digits
•Any zeros to the right of all nonzero digits in a number with decimal-place digits are significant; 70.00 contains four significant digits.
•Any zeros to the right of all nonzero digits in an integer, such as in 4000, are uncertain unless further information is given; 4000 has only one significant digit.
•All the digits in the coefficient of a number in scientific notation are significant.
Formula for density
Percent by mass formula
mass of element/mass of compound x 100
Law of multiple proportions
states that for any two (or more) compounds that are composed of the same elements, for a given mass of one of the elements, the ratio of the masses of any other element in the compounds is a small, whole-number ratio
Proton charge and location
+1 in nucleus
Neutron charge and location
0 in nucleus
electron charge and location
-1 outside the nucleus in "ring"
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