semester i review answers. semester i review how many sig-figs are found in each number? 0.3453...
TRANSCRIPT
Semester I Review
ANSWERS
Semester I Review
How many sig-figs are found in each number?0.345 33005 4300 13.002 40.00023 2
Semester I Review
Round each number to three sig-figs.45678 457000.002894 0.0028923.76 23.8100.5 100.56.799 56.8
Semester I Review
Which of the following is a mixture.Pure water compoundClean air homogenous mixture Iron (II) oxide compoundSalt water homogenous mixtureCarbon dioxide compound
Semester I Review
Which of the following is a chemical change.Cutting paper physicalBoiling water physicalRusting iron chemicalBurning gasoline chemical
Symbol Mass # Atomic # Protons Neutrons Electrons
X - _25__ 25 10 10 15 10
Y - 35 35 14 14 21 14
Z - _56__ 56 25 25 31 25
Complete the table using the given numbers
Semester I Review
Calculate the average atomic mass given the following data: element Y has three isotopes 35.0% = 23.5 amu, 55.0% = 25.0 amu and 10.0% = 26.0 amu.
(35x23.5) + (55x25.0) + (10x26.0) = 24.6
100
Semester I Review
25.0 grams of a given metal displaces 44.2 mL of water; what is the density of the metal?
25.0g/44.2mL = 0.566g/mL
Semester I Review
What did each scientist contribute to the development of the modern atom.Dalton = proof of the atomThomson = cathode rays are electronsRutherford = dense positive nucleus,
electrons outside nucleus, atom mostly empty space
Milliken = mass to charge ratio of the electron
Trial # Measurement True Value = 34.50
1 34.56
Accurate and
precise
2 34.45
3 34.78
Determine if the data below is accurate, precise, both, or neither
Calculate the percent error using the average of the measurements. (34.60 – 34.50) x100 = 0.2899%
34.50
Semester I Review
1. The splitting of a nucleus is known as ___fission _____.
2. The combining of two small nuclei to form a larger one is known as ____Fusion______.
3. Give the formula of an alpha particle and beta particle.
He42 0
1
Semester I Review1. Decay of polonium-218 by alpha ()
emission.1. +
2. Decay of carbon – 14 by beta emission
3. +
4. Decay of Thorium - 232 by an electron capture
5. +
Po21884
He42 Pb214
82
C146 0
1 N147
Th23290 0
1 Ac23289
Semester I Review
1. The half-life of phosphorous-30 is 2.5 min. If you start with 55 g of phosphorus-30, how many grams would remain after 27.5 min?
Mfinal = (55g)(.5)11 = 0.027g
Semester I Review
Calculate the specific heat of an unknown metal, given that 25.0g of the metal lost 3570 J of energy during a temperature change from 100.0oC to 25.0oC
c = 3570J / (25.0g)x(75.0oC) c = 1.90 J/goC
Semester I Review
Identify each of the letters on the graph and explain what is occurring.
C = solid warming/cooling D = Phase change solid to
liquid or vice versa E = liquid warming/cooling F = phase change liquid to
gas or vice versa G = gas warming/cooling
C
D
E
F
G
Semester I Review
Label the solid, liquid, and gas regions on the graph.
Label the triple point and critical point
At 600oC and 90 atm, what phase is yummygum in?
Label the solid, liquid, and gas regions on the graph.
Label the triple point and critical point
At 600oC and 90 atm, what phase is yummygum in? liquid
solid
liquid
gas
Triple point
Critical point
Give the formula for the following compounds 1) iron (II) arsenide Fe3As2
2) lead (II) sulfate PbSO4
3) lead (IV) hydroxide Pb(OH)4
4) copper (II) acetate Cu(C2H3O2)2
5) beryllium chloride BeCl2 6) ammonium chromate (NH4)2CrO4
7) silver oxide Ag2O
8) potassium sulfide K2S
Semester I Review
Give the name of the following compounds 1) NaBr Sodium Bromide 2) Sc(OH)3 Scandium (III) Hydroxide 3) V2(SO4)3 Vanadium (III) Sulfate 4) NH4F Ammonium Fluoride 5) CaCO3 Calcium Carbonate 6) NiPO4 Nickel (III) Phosphate 7) Li2SO3 Lithium Sulfite 8) Zn3P2 Zinc Phosphide 9) Sr(C2H3O2)2 Strontium Acetate 10) Cu2O Copper (I) Oxide
Semester I Review
Name the compounds H2SO3 Sulfurous Acid H2S Hydrosulfuric acid H3PO4 Phosphoric acid HCN Hydrocyanic acid H3P Hydrophosphoric acid HBr Hydrobromic acid HClO Hypochlorous acid
Semester I Review
Give the formula for the following compounds hydrofluoric acid HF hydroselenic acid H2Se
carbonic acid H2CO3
nitrous acid HNO2
sulfuric acid H2SO4
hydrobromic acid HBr Chlorous acid HClO2
Semester I Review
Antimony tribromide SbBr3
Silicon difluoride SiF2
Tetracarbon octahydride C4H8
Dinitrogen monoxide N2O
Pentaphosphorous decoxide P5O10
Sulfur hexachloride SF6
Semester I Review
P2O5 Diphosphorous pentoxide
SO2 Sulfur dioxide
NO2 Nitrogen dioxide
AsCl3 Arsenic trichloride
P4H8 Tetraphosphorous octahydride
Semester I Review
Balance and classify the reactions _2_ C8H18 + _25_ O2 _16_ CO2 + _18_ H2O ____ FeCl3 + _3__ NaOH ____ Fe(OH)3 + _3__NaCl
_4__ P + __5_O2 _2__P2O5
_2__ Na + _2__ H2O __2_ NaOH + ____H2
_2__ Ag2O _4__ Ag + ____O2
____ S8 + _12_ O2 _8__ SO3
Semester I Review