Answer Key Review Exam 1 1.Atom 2. Compound 3. Molecule 4

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Answer Key Review Exam 1
1.Atom
2. Compound
3. Molecule
4.Mixture
5. Nucleus is the protons and neutrons
Neutons(0) determine isotope and mass
Protons (+) determine element
Electron(-) determine charge
Group 1 Alkali Metals
Group 2 Alkaline Earth Metals
Group 17 Halogens
Groups 18 Noble Gases
Metals are on the left of the periodic table
Semimetals are located on a staircase in between the nonmetals and metals
Nonmetals are in the upper left
Matching
1.
2.
3.
4.
5.
6.
Bc
Df
Ad
Eb
Fe
Ca
tera T 1 terameter (Tm) = 1012 m
giga G 1 gigameter (Gm) = 10s m
mega M 1 megameter (Mm) = 106 m
kilo K 1 kilometer (Km) = 103 m
deci d 1 decimeter (dm) = 10-1 m
centi c 1 centimeter (cm) = 10-2 m
milli m 1 millimeter (mm) = 10-3 m
nano n 1 namometer (nm) = 10-9 m
angstrom Å 1 angstrom (Å) = 10-10 m
Sig Figs
1. 10.68
2. 72.98
3. 29
4. 1.80
5. 2.3
Rounding/Scientific notation
1.6.599X10^1
2. 7.84x10^-4
3. 3.9X10^4
4.6.7834X10^-5
5. 9X10^2
Temp Conversions
1. 21.95 C
2. 170 F
3. 19.4 C = 290 K
4. Boiling 373K 212F Freezing 273K 32F
DA
1.
a. 76mL
b. 50nm
c. 1.55g/L
d. 6.151X10^-3
e.4.32X10^5
f. 707.9 cm^3
2. 2.52 kg air
P or C
1. Chemical
2. Physical
3. Physical
4. Chemical
5. Chemical
Laws
1. Mass is neither created nor destroyed.
2. A pure chemical substance always contains the same ratio of elements
3. If 2 elements A and B combine to from more than one compound than
the mass of B that can combine with A is a small whole number.
4. 5.00g D, Conservation of mass
Chart in class activity
Ion-cation, loses,anion, gains
Isotopes B
Average atomic weight= 24.31amu
Naming/Ionic/Covalent
1. Magnesium oxide, ionic, 2
2. Sulfur hexafluoride, covalent,0
3. Coppe(II) sulfide,ionic, don’t worry about it
4. Dinitrogen tetroxide,covalent,0
Compound
1. CaCl2,ionic, 3
2. P4S10,covalent,0
3. Cu(ClO)2,ionic,don’t worry about it
4. Al(NO3)3
Balancing Equations
1. 4,3,2
2. 2,7,4,6
3. 2,1,2
4. 2,3,1,3, 6 mol CuO
Formula mass and molar mass are the same number but FM is in amu
and MM is in g/mol
Formula Weight
a. 342.0amu
b. 164.1amu
Conversions
1. 6.022X10^23 molecules of H2O
2. 0.874 mol C, 5.26X10/////623
3. 0.08267 mol MgCl2
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