Chem final

Which list of symbols represents nonmetals, only?

• B, Al, Ga

• Li, Be, B

• C, Si, Ge

• P, S, Cl

What is the chemical formula for lead(IV) oxide?

• PbO₂

• PbO₄

• Pb₂O

• Pb₄O

Which statement describes the general trends in electronegativity and atomic radius as the elements in Period 2 are considered in order from left to right? 

• Both electronegativity and atomic radius increase.
• Both electronegativity and atomic radius decrease. 
• Electronegativity increases and atomic radius decreases.
• Electronegativity decreases and atomic radius increases.

What is the percent composition by mass of nitrogen in (NH₄)₂CO₃ (gram-formula mass = 96.0 g/mol)? 

• 14.6% 
• 29.2%
• 8.4%
• 87.5%

Given the balanced equation:
2KI + F₂ → 2KF + I₂
Which type of chemical reaction does this equation represent? 

• synthesis 
• decomposition
• single replacement 
• double replacement 

Which formula represents a nonpolar molecule containing polar covalent bonds?

• 1
• 2
• 3
• 4

What is the total amount of heat required to completely melt 347 grams of ice at its melting point? 

• 334 J
• 1450 J
• 116000 J
• 784000 J

What is the charge of the nucleus of an oxygen atom?

• 0
• -2
• +8
• +16

Which Lewis electron-dot diagram represents a nitrogen atom in the ground state?

• 1
• 2
• 3
• 4

What is the most likely electronegativity value for a metallic element?

• 1.3
• 2.7
• 3.4
• 4