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CHEM 120: Exam 1
In ________ and ___________ you round to the lowest number of decimal places.
|
addition
subtraction |
In ______________ or ________ you round to the least amount of numbers in a problem
|
multiplication
division |
___________ analysis is a technique used to convert one physical quantity to another
|
dimensional
|
Density = ____ divided by ______
|
mass
volume |
Mass = ______ times _______
|
volume
density |
Law of ________ composition states that composition of a pure substance never ______
|
constant
varies |
Law of multiple ___________ states that when two or more different compounds of the two elements are compared, the masses of one.......and in the ration of small whole numbers
|
proportions
|
Law of ____________ of Mass says the total mass is the same at the end as in the beginning
|
Conservation |
The atomic theory of matter states that matter is neither _______nor _________
|
created
destroyed |
Protons have a __ charge
|
1+ |
Neutrons have a _______ charge
|
neutral |
Electrons have a __ charge
|
1- |
All atoms of the same element have the same number of _______.
|
Protons |
The bottom left hand number beside the element symbol is the number of _______, and it is the ______ number |
protons
atomic |
Mass number is _______ plus ________
|
protons
neutrons |
________ are atoms that have the same number of protons but a different number of neutrons
|
isotopes |
______ ____ ____ or (___) is one-twelfth the mass of a carbon-12 atom
|
atomic mass unit
AMU |
Molecular/Empirical
Ex: H202 |
Molecular |
Molecular/Empirical
HO |
Empirical |
____ are formed when an atom loses or gains electrons
|
Ions |
A cation is a ________ charge
|
positive |
a anion is a ________ charge
|
negative |
protons and neutrons are in the _______ of an atom
|
nucleus |
65
Cu
29
65 is the ____ ______.
29 is the number of _______. |
mass number
protons |
On the periodic table...the number above the symbol is the ______ number (# of _______), and the number below is the ____ number. |
atomic
protons
mass |
N^3- means that there are 3 ____ protons than electrons
|
less |
Si is _______
N is ________
Cr is ________
Ar is _____
Sr is _________ |
Silicon
Nitrogen
Chromium
Argon
Strontium |
Group _ is alkali metals
|
1 |
Group _ is alkaline earth metals
|
2 |
Group __ is halogens
|
17 |
group __ is rare gases
|
18 |
The groups go _ through __, and the periods go _ through _
|
1
18
1
7 |
Groups _ through __ are called transition elements
|
3
12 |
The ______ are below and to the left of the zig zag line
|
metals |
the ___-______ are above and to the right of the zig-zag line
|
non-metals
|
non-metals
|
white |
Carbon atoms are _____
|
black |