
Chemistry EOC Review

Quiz
•
Chemistry
•
10th - 12th Grade
•
Hard
+12
Standards-aligned
Laurissa Vines-Mccormick
Used 40+ times
FREE Resource
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145 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Which of the following isotopes has 18 neutrons?
40Ar
35Cl
18F
24Mg
Answer explanation
To find the number of neutrons, subtract the atomic number from the mass number. For 35Cl, the atomic number is 17, so 35 - 17 = 18 neutrons. Thus, 35Cl has 18 neutrons.
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
What is the correct name of Pb(CO3)2?
Lead carbonate
Lead (II) carbonate
Lead (IV) carbonate
Lead dicarbonate
Answer explanation
The correct name for Pb(CO3)2 is Lead (II) carbonate, as lead can have multiple oxidation states. In this case, the lead is in the +2 oxidation state, making 'Lead (II) carbonate' the accurate choice.
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
What is the most likely result of nitrogen and chlorine reacting based on their dot diagrams?
Three chlorine atoms will each steal one electron from nitrogen
Five chlorine atoms will each steal one electron from nitrogen
Three chlorine atoms will each share one electron with nitrogen
Five chlorine atoms will each share one electron from nitrogen
Answer explanation
Nitrogen has five valence electrons and needs three more to achieve stability. Chlorine has seven valence electrons and needs one more. Therefore, three chlorine atoms will share one electron each with nitrogen, forming covalent bonds.
Tags
NGSS.HS-PS1-1
NGSS.HS-PS1-2
4.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
As the number of protons increases across a period, while electrons are added to the same energy level, all of the following are true EXCEPT:
the effective nuclear charge increases
the electron shielding increases
the atomic radius decreases
the ionization energy increases
Answer explanation
As protons increase across a period, effective nuclear charge rises, atomic radius decreases, and ionization energy increases. However, electron shielding does not increase significantly since electrons are added to the same energy level.
Tags
NGSS.HS-PS1-1
NGSS.HS-PS1-2
5.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
If the number of protons changes, but the neutrons and electrons remain the same, which of the following is FALSE?
The identity of the element will change
The mass of the particle will change
The electron configuration of the particle will change
The charge of the particle will change
Answer explanation
Changing the number of protons alters the element's identity and charge, and affects mass. However, the electron configuration remains unchanged if electrons stay the same, making the statement about electron configuration false.
Tags
NGSS.HS-PS1-7
6.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
What is the percent composition by mass of nitrogen in Ca(NO3)2?
8.5 %
17 %
24 %
59 %
Answer explanation
To find the percent composition of nitrogen in Ca(NO3)2, calculate the molar mass: Ca=40.08, N=14.01 (2 N), O=16.00 (6 O). Total mass = 164.10 g. Nitrogen mass = 28.02 g. Percent = (28.02/164.10) x 100 = 17%. Thus, the answer is 17%.
Tags
NGSS.HS-PS1-7
7.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
What is the name of N2O5?
nitrate
dinitrogen pentoxide
nitrogen pentaoxide
dinitrogen pentoxygen
Answer explanation
The correct name for N2O5 is dinitrogen pentoxide, which indicates two nitrogen atoms and five oxygen atoms. The other options do not accurately reflect the chemical composition.
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