Quarter IIPart I: Stoichiometry

Sample Question I

Elements from which two groups in the periodic table would most likely

combine with each other to form an ionic compound?

From: Virginia End-of-Course Assessments, 2001 Chemistry

A 1 and 2 B 1 and 17 C 16 and 17 D 17 and 18

Sample Question II

What is the approximate mass of one mole of CO2?

From: 2008 Virginia End-of-Course Assessments, Chemistry

A 24 g B 44 g C 28 g D 56 g

Sample Question III

A student calculated the molar mass of Ca(OH)2 as follows: The answer he

calculated is wrong. Which labeled step contains his

mistake?

A. Step 1

B. Step 2

C. Step 3

D. Step 4

Sample Question IV

In chemical compounds, covalent bonds form when —From: 2003 Virginia End-of-Course Assessments, Chemistry

A the electronegativity difference between two atoms is very large

B electrons are completely transferred between two metals

C pairs of electrons are shared between two nonmetal atoms

D two nonmetal ions are attracted to each other by opposite charges

Sample Question V

If the diagram below was the correct representation for the Lewis structure

of a molecule, then the X would be representative of the element —

From: 2003 Virginia End of Course Assessments, Chemistry

A OxygenC NitrogenB FluorineD Potassium

The sample below contains approximately 9.03 x 1023 atoms of Carbon. The sample most likely contains…

A. 1 mole of CarbonB. 1.5 moles of CarbonC. 1 molecule of CarbonD. 6.022 x 1023 molecules of C

Sample Question VI

A student was asked to calculate for the approximate number of molecules that can be expected from a 40-gram sample of glucose. Her calculations are found below.

Her teacher informed her that she made an error. Which labeled step contains the error?

A. Step 1 B. Step 2 C. Step 3 D. Step 4

Sample Question VII

Sample Question VIIIThe structural formula of methane is

shown below: From the elements making up the

compound, this molecule is most likely…

A. crystalline B. ionic C. covalent D. highly polar

Sample Question IX

A compound has the empirical formula CH2O and a gram-formula mass of 60 grams per mole. What is the molecular formula of this compound?

From: 2009 Aug NY Regents (Chemistry)

A) CH2O

B) C2H4O2

C) C3H8O

D ) C4H8O4

Sample Question No. X

The mass of one atom of Potassium is...

A) 1.54 x 1022 g B) 6.49 x 10-23 g C) 3.15 x 10-23 g D) 1.14 x 1022 g

Sample Question XI

Which atom in the ground state has the most stable valence electron configuration?

From: 2009 June NY Regents (Chemistry)

A) KB) SiC) ScD) Kr