CHEM-1411 (2) EXAM QUESTIONS WITH
100% CORRECT ANSWERS L LATEST
VERSION 2025/2026.
A 12.39 g sample of phosphorus reacts with 42.54 g of chlorine to form only phosphorus
trichloride (PCl 3). If it is the only product, what mass of PCl 3 is formed?
A) 30.15 g
B) 54.93 g
C) 140.01 g
D) 79.71 g
E) 91.86 g - ANS 54.93 g
Calculate the atomic mass of gallium if gallium has 2 naturally occurring isotopes with the
following masses and natural abundances:
Ga-69 68.9256 amu 60.11%
Ga-71 70.9247 amu 39.89%
A) 70.68 amu
B) 69.93 amu
C) 69.72 amu
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, D) 70.00 amu
E) 69.80 amu - ANS 69.72 amu
Determine the name for TiCO 3. Remember that titanium forms several ions.
A) titanium carbide
B) titanium (I) carbonate
C) titanium (II) carbonite
D) titanium (II) carbonate
E) titanium carbonite - ANS titanium (II) carbonateDetermine the number of protons,
neutrons and electrons in the following: X =40/18
Determine the number of protons, neutrons and electrons in the following:
X =40/18
A) p+ = 40 n° = 22 e- = 18
B) p+ = 22 n° = 18 e- = 18
C) p+ = 18 n° = 18 e- = 22
D) p+ = 18 n° = 22 e- = 40
E) p+ = 18 n° = 22 e- = 18 - ANS p+ = 18 n° = 22 e- = 18
Predict the charge that a calcium ion would have.
A) 2-
B) 3+
C) 2+
D) 1+
E) 6- - ANS 2+
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
100% CORRECT ANSWERS L LATEST
VERSION 2025/2026.
A 12.39 g sample of phosphorus reacts with 42.54 g of chlorine to form only phosphorus
trichloride (PCl 3). If it is the only product, what mass of PCl 3 is formed?
A) 30.15 g
B) 54.93 g
C) 140.01 g
D) 79.71 g
E) 91.86 g - ANS 54.93 g
Calculate the atomic mass of gallium if gallium has 2 naturally occurring isotopes with the
following masses and natural abundances:
Ga-69 68.9256 amu 60.11%
Ga-71 70.9247 amu 39.89%
A) 70.68 amu
B) 69.93 amu
C) 69.72 amu
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, D) 70.00 amu
E) 69.80 amu - ANS 69.72 amu
Determine the name for TiCO 3. Remember that titanium forms several ions.
A) titanium carbide
B) titanium (I) carbonate
C) titanium (II) carbonite
D) titanium (II) carbonate
E) titanium carbonite - ANS titanium (II) carbonateDetermine the number of protons,
neutrons and electrons in the following: X =40/18
Determine the number of protons, neutrons and electrons in the following:
X =40/18
A) p+ = 40 n° = 22 e- = 18
B) p+ = 22 n° = 18 e- = 18
C) p+ = 18 n° = 18 e- = 22
D) p+ = 18 n° = 22 e- = 40
E) p+ = 18 n° = 22 e- = 18 - ANS p+ = 18 n° = 22 e- = 18
Predict the charge that a calcium ion would have.
A) 2-
B) 3+
C) 2+
D) 1+
E) 6- - ANS 2+
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