Chem 101 Exam 2024 Questions With 100% Correct Answers
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Course
Chem 101
Institution
Chem 101
Chem 101 Exam 2024 Questions With 100% Correct Answers
Atoms combine in - ANSWER- small whole-number ratios when forming compounds
If the Thompson model were true, what would have happened to the alpha particle beam? - ANSWER- The beam should not interact with the diffuse electron cloud and...
Chem 101 Exam 2024 Questions With
100% Correct Answers
Atoms combine in - ANSWER- small whole-number ratios when forming compounds
If the Thompson model were true, what would have happened to the alpha particle
beam? - ANSWER- The beam should not interact with the diffuse electron cloud and go
straight through each gold atom.
The source of the deflection has to be what charge? - ANSWER- Positive
Since neutrons also contribute mass to an atom, where would you expect neutrons to
exist? - ANSWER- Inside the nucleus with protons
Carbon has a ________ nuclear charge than nitrogen. - ANSWER- Smaller
Sodium ______ one electron to become a +1 cation. - ANSWER- Loses
How many protons and electrons are in a Mg^2+ cation? - ANSWER- 12p, 10e
How many protons and electrons are in an O^2- anion? - ANSWER- 8p, 10e
Place the number of neutrons next to the correct isotope. 12C - ANSWER- 6n
Place the number of neutrons next to the correct isotope. 13C - ANSWER- 7n
Place the number of neutrons next to the correct isotope. 14C - ANSWER- 8n
Rank the following isotopes in order of increasing number of neutrons. - ANSWER- 2H,
81Br, 238U
Bromine has two naturally occurring isotopes,Br and Br. Br has an exact mass of
78.9183371 amu and is 50.69% abundant. Calculate the exact isotope mass of Br.
Report your answer to six decimal places. Do not enter the units of amu. - ANSWER-
80.909136
The atomic mass of Bromine=79.90 amu,
the equation becomes (78.9183371)(0.5069)+(exact isotope mass of
81Br)(0.4931)=79.904 and solve for amu of 81Br
Note: (1-0.5069=0.4931)
Identify the column containing the halogens. - ANSWER- 7th Column in periodic table
(does not include lower portion of periodic table with metals)
, Identify the column containing the alkaline earth metals. - ANSWER- 2nd Column in
periodic table
Which 4th row element prefers to form a +3 cation? - ANSWER- Ga
How many grams are in a 1.5 mole sample of sodium? - ANSWER- 34g
1.5 moles Na * 22.99 g Na/1 mol Na = 34 grams of Na
How many moles are in a 65.4 gram sample of boron? - ANSWER- 6.05 moles
65.4 grams B * 1mol/10.81 grams = 6.05 moles of boron
Match the following chemical species with their appropriate designation. - ANSWER-
Lithium (Li) - Metal
Li+ - Cation
Fluorine (F) - Nonmetal
F- -Anion
LiF - Formula unit (note: LiF is the smallest number of cations and anions that form a
neutral ionic compound, so it is the formula unit)
Classify each of the following compounds as either ionic or covalent. - ANSWER- NaCl -
Ionic
H2O - Covalent
KBr - Ionic
Na2O - Ionic
CO2 - Covalent
C2H6 - Covalent
What ions do Mg and S form? - ANSWER- Mg2+, S2-
Which of the following is the name for the compound MgS? - ANSWER- Magnesium
sulfide
Which of the following is the name for the compound K2O - ANSWER- Potassium oxide
Which of the following is the name for the compound FeCl2 - ANSWER- Iron(II) chloride
Which of the following is the name for the compound Cr2O3 - ANSWER- Chromium(III)
oxide
What is the formula of cobalt(III) bromide? - ANSWER- CoBr3
What is the formula of calcium nitrite? - ANSWER- Ca(NO2)2
Which of the following is the name for the compound N2O4 - ANSWER- Dinitrogen
tetraoxide
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