ECU CHEM 1120 Dutta Exams Review – All Tests, Notes & Practice
Questions
Which of the following statements is correct:
A) neither elements nor compounds are pure substances
B) both elements and compounds are pure substances
C) compounds, but not elements, are pure substances
D) elements, but not compounds, are pure substances - ANS ✔✔B
If 75.0 mg of potassium-42 was administered to a patient at 10 am on Monday, how many mg
will remain at 10 am on Thursday of that same week? The half-life of K-42 is 12 hours.
A) 18.8 mg
B) 9.38 mg
C) 37.5 mg
D) 1.17 mg - ANS ✔✔D
Which of the following is a chemical property of aspirin?
A) it does not readily dissolve in water
B) it is a white crystalline solid in pure form at room temp
C) it can be compressed into tablets when mixed with cornstarch
D) it melts at 135* C
E) it does not decompose when protected from moisture - ANS ✔✔E
Which of the following subtle consists of three orbitals?
A) 4f
B) 4p
,C) 4s
D) 4d
E) none of the above - ANS ✔✔B
In scientific notation, the number 0.0046 is expressed as
A) 4.6 x 10^-2
B) 46 x 10^-3
C) 4.6 x 10^-3
D) 4.6 x 10^-1
E) 46 x 10^-1 - ANS ✔✔C
In a neutral atom the number of ___ is equal to the number of ____
A) protons, neutrons
B) neutrons, electrons
C) protons, electrons
D) protons + electrons, neutrons
E) none of the above - ANS ✔✔C
How many milliliters are there in one liter?
A) 10^2 mL
B) 10^3 mL
C) 10^-3 mL
D) 10^-2 mL
E) 10^1 mL - ANS ✔✔B
,Two naturally occurring isotopes exist for the hypothetical element Carolinium. 75.0% of
Carolinium atoms have a relative mass of 100.0 amu and 25.0% have a relative mass of 102.0
amu. What is the atomic mass of Carolinium?
A) 101.5 amu
B) 101.8 amu
C) 100.5 amu
D) 101.0 amu
E) 100.3 amu - ANS ✔✔C
Calculate the density of a liquid if a 64.3 g sample has a volume f 50.0 mL
A) 0.322 g/mL
B) 114.3 g/mL
C) 0.778 g/mL
D) 1.29 g/mL
E) 14.3 g/mL - ANS ✔✔D
Find the difference between two masses measured as 123.6 g and 115.972 grams. Express the
answer to the correct number of significant figures.
A) 8.0 g
B) 7.628 g
C) 7.6 g
D) 8 g
E) 7.63 g - ANS ✔✔C
Which chemical symbol represents a metallic element?
A) P
B) H
, C) Br
D) Kr
E) K - ANS ✔✔E
What is the numerical value of 1.50 / (1.222 x 10^-3) ? Express your answer using the correct
number of significant figures.
A) 1.227 x 10^3
B) 1.23 x 10^3
C) 1.2 x 10^3
D) 1.23 x 10^-3
E) 1 x 10^3 - ANS ✔✔B
Radioactivity is generally associated with which part of the atom?
A) the entire atom
B) nucleus
C) protons
D) neutrons
E) electrons - ANS ✔✔B
Atoms of 35/17 Cl contain ___ protons and ___ neutrons
A) 35; 18
B) 35; 17
C) 17; 17
D) 18; 17
E) 17; 18 - ANS ✔✔E
Questions
Which of the following statements is correct:
A) neither elements nor compounds are pure substances
B) both elements and compounds are pure substances
C) compounds, but not elements, are pure substances
D) elements, but not compounds, are pure substances - ANS ✔✔B
If 75.0 mg of potassium-42 was administered to a patient at 10 am on Monday, how many mg
will remain at 10 am on Thursday of that same week? The half-life of K-42 is 12 hours.
A) 18.8 mg
B) 9.38 mg
C) 37.5 mg
D) 1.17 mg - ANS ✔✔D
Which of the following is a chemical property of aspirin?
A) it does not readily dissolve in water
B) it is a white crystalline solid in pure form at room temp
C) it can be compressed into tablets when mixed with cornstarch
D) it melts at 135* C
E) it does not decompose when protected from moisture - ANS ✔✔E
Which of the following subtle consists of three orbitals?
A) 4f
B) 4p
,C) 4s
D) 4d
E) none of the above - ANS ✔✔B
In scientific notation, the number 0.0046 is expressed as
A) 4.6 x 10^-2
B) 46 x 10^-3
C) 4.6 x 10^-3
D) 4.6 x 10^-1
E) 46 x 10^-1 - ANS ✔✔C
In a neutral atom the number of ___ is equal to the number of ____
A) protons, neutrons
B) neutrons, electrons
C) protons, electrons
D) protons + electrons, neutrons
E) none of the above - ANS ✔✔C
How many milliliters are there in one liter?
A) 10^2 mL
B) 10^3 mL
C) 10^-3 mL
D) 10^-2 mL
E) 10^1 mL - ANS ✔✔B
,Two naturally occurring isotopes exist for the hypothetical element Carolinium. 75.0% of
Carolinium atoms have a relative mass of 100.0 amu and 25.0% have a relative mass of 102.0
amu. What is the atomic mass of Carolinium?
A) 101.5 amu
B) 101.8 amu
C) 100.5 amu
D) 101.0 amu
E) 100.3 amu - ANS ✔✔C
Calculate the density of a liquid if a 64.3 g sample has a volume f 50.0 mL
A) 0.322 g/mL
B) 114.3 g/mL
C) 0.778 g/mL
D) 1.29 g/mL
E) 14.3 g/mL - ANS ✔✔D
Find the difference between two masses measured as 123.6 g and 115.972 grams. Express the
answer to the correct number of significant figures.
A) 8.0 g
B) 7.628 g
C) 7.6 g
D) 8 g
E) 7.63 g - ANS ✔✔C
Which chemical symbol represents a metallic element?
A) P
B) H
, C) Br
D) Kr
E) K - ANS ✔✔E
What is the numerical value of 1.50 / (1.222 x 10^-3) ? Express your answer using the correct
number of significant figures.
A) 1.227 x 10^3
B) 1.23 x 10^3
C) 1.2 x 10^3
D) 1.23 x 10^-3
E) 1 x 10^3 - ANS ✔✔B
Radioactivity is generally associated with which part of the atom?
A) the entire atom
B) nucleus
C) protons
D) neutrons
E) electrons - ANS ✔✔B
Atoms of 35/17 Cl contain ___ protons and ___ neutrons
A) 35; 18
B) 35; 17
C) 17; 17
D) 18; 17
E) 17; 18 - ANS ✔✔E
