Chemistry EOC Review

Chemistry EOC Review

Assessment

Quiz

Chemistry

10th - 12th Grade

Hard

NGSS
HS-PS1-1, MS-PS1-1, HS-PS1-2

+12

Standards-aligned

Created by

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

Media Image

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

Media Image

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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