Exam (elaborations)

Chem 1020 Final EXAM 2024/25 UPDATE ALREADY PASSED !! WITH 100% VERIFIED ANSWERS

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Chem 1020

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Chem 1020

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 ANSWER b: Compounds, but not elements: are pure substances A pure substance F is found...

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chem 1020 final exam 202425
chem 1020 final exam 202425 update already passe
which of the following statements is true a elem

Institution Chem 1020
Course Chem 1020

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Chem 1020 Final EXAM 2024/25 UPDATE ALREADY
PASSED !! WITH 100% VERIFIED ANSWERS
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 ANSWER ✔ 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 ANSWER ✔ 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 ANSWER ✔ 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 ANSWER ✔ d: All subatomic
particles in an atom
Write the complete electron configuration of Oxygen - CORRECT ANSWER ✔ 1s2
2s2 2p4
Write the valence electron configuration of Sulfur - CORRECT ANSWER ✔ 3s2
3p4
Write the orbital diagram for Nitrogen - CORRECT ANSWER ✔ /\\/ /\\/ /\/\/\
1s 2s 2p
Group IA is called, how many valence electrons? - CORRECT ANSWER ✔ Alkali
Metals, 1
Group IIA is called, how many valence electrons? - CORRECT ANSWER ✔ Alkali
Earths, 2

, Chem 1020 Final EXAM 2024/25 UPDATE ALREADY
PASSED !! WITH 100% VERIFIED ANSWERS
Group VIIA is called, how many valence electrons? - CORRECT ANSWER ✔
Halogens, 7
Group VIIIA is called, how many valence electrons? - CORRECT ANSWER ✔ Noble
Gases, 8
Convert 80.0km into cm - CORRECT ANSWER ✔ 80.0km x 100000cm/1km = 8.0 x
10^7
Convert 80.0m into km - CORRECT ANSWER ✔ 80.0cm x 1km/1000m = 8.0 x 10^-
2
Convert 2.0 hours into seconds - CORRECT ANSWER ✔ 2.0hrs x 3600secs/1hr =
7200 seconds
Convert 20000 seconds into hours - CORRECT ANSWER ✔ 20000 x 1hr/3600secs
= 5.56 hours
Convert 2.5 m/s into km/hr - CORRECT ANSWER ✔ 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 ANSWER ✔ 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 ANSWER ✔ 10.0g/10.9mL
= 0.917 (Olive Oil)
There is a temperature of 25 degrees Celsius.
What would it be in Fahrenheit? - CORRECT ANSWER ✔ (25 x 9/5) + 32 = 77F
There is a temperature of 25 degrees Celsius.
What would it be in Kelvin? - CORRECT ANSWER ✔ 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 ANSWER
✔ 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 ANSWER ✔ 6 electrons
How many total electrons are present in an N3- ion? - CORRECT ANSWER ✔ 10
electrons

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