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Chem 1020 Final Exam With Complete Solutions
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Chem 1020 Final Exam WithComplete Solutions
Which of the following statements is true?
a: Elements, but not compounds, are pure substances
b: Compounds, but not elements: are pure substances
c: Both elements & compounds are pure substances CORRECT ANSWERS b:
Compounds, but not elements: are pure substances
A pure substance F is found to change upon heating into two new pure substances
M & Y. Both M & Y may be decomposed by chemical means. We can conclude
that:
a: F is an element, M & Y are compounds
b: F is a compound, M & Y are elements
c: All are elements
d: All are compounds CORRECT ANSWERS d: All are compounds
Isotopes of a given element:
a: Same mass # but different # of protons
b: Different mass # but identical # of protons
c: Same atomic # but different chemical properties
d: Same mass # but different chemical properties CORRECT ANSWERS b:
Different mass # but identical # of protons
The quantity "A+Z" gives the number of:
a: Electrons in an atom
b: Neutrons in an atomic nucleus
c: Nucleons in an atomic nucleus
d: All subatomic particles in an atom CORRECT ANSWERS d: All subatomic
particles in an atom
Write the complete electron configuration of Oxygen CORRECT ANSWERS 1s2
2s2 2p4
,Write the valence electron configuration of Sulfur CORRECT ANSWERS 3s2 3p4
Write the orbital diagram for Nitrogen CORRECT ANSWERS /\\/ /\\/ /\/\/\
1s 2s 2p
Group IA is called, how many valence electrons? CORRECT ANSWERS Alkali
Metals, 1
Group IIA is called, how many valence electrons? CORRECT ANSWERS Alkali
Earths, 2
Group VIIA is called, how many valence electrons? CORRECT ANSWERS
Halogens, 7
Group VIIIA is called, how many valence electrons? CORRECT ANSWERS
Noble Gases, 8
Convert 80.0km into cm CORRECT ANSWERS 80.0km x 100000cm/1km = 8.0 x
10^7
Convert 80.0m into km CORRECT ANSWERS 80.0cm x 1km/1000m = 8.0 x 10^-
2
Convert 2.0 hours into seconds CORRECT ANSWERS 2.0hrs x 3600secs/1hr =
7200 seconds
Convert 20000 seconds into hours CORRECT ANSWERS 20000 x 1hr/3600secs =
5.56 hours
Convert 2.5 m/s into km/hr CORRECT ANSWERS 2.5m/s x 1km/1000m x
3600/1hr = 9km/hr
What volume (in cm3) of gold is needed to have a mass of 22.8g? The density of
gold is 10.5 g/cm3. CORRECT ANSWERS 22.8g / 10.5g/cm = 2.17g/cm
, What is the density of a liquid if a 10.0g sample has a volume of 10.9mL. Identify
the substance (using the table of densities). CORRECT ANSWERS 10.0g/10.9mL
= 0.917 (Olive Oil)
There is a temperature of 25 degrees Celsius.
What would it be in Fahrenheit? CORRECT ANSWERS (25 x 9/5) + 32 = 77F
There is a temperature of 25 degrees Celsius.
What would it be in Kelvin? CORRECT ANSWERS 25 + 273 = 298 Kelvin
Which has similar properties? (MORE THAN ONE)
a: 1s2 2s1 & 1s2 2s2
b: 1s2 2s2 2p6 & 1s2 2s2 2p6 3s2 3p6
c: 1s2 2s2 2p3 & 1s2 2s2 2p6 3s2 3p6 4s2 3d3
d: 1s2 2s2 2p6 3s2 3p4 & 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p4 CORRECT
ANSWERS b: 1s2 2s2 2p6 & 1s2 2s2 2p6 3s2 3p6
d: 1s2 2s2 2p6 3s2 3p4 & 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p4
How many electrons appear in the Lewis symbol for an element whose electron
configuration is 1s2 2s2 2p6? CORRECT ANSWERS 6 electrons
How many total electrons are present in an N3- ion? CORRECT ANSWERS 10
electrons
Selenium & Potassium form. What's the equation if the charge be neutral?
CORRECT ANSWERS K2Se
Which of the following is a coordinate covalent bond?
a: H-C=N
b: O=C=O
c: N---N
d: N---N-O CORRECT ANSWERS d: N---N-O
Which bonds polarity is incorrect?
a: +->
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