TEST-Ionic/Covalent, Hydrates, Molar mass, Empirical

An empirical formula:

• is a formula that calculates the coefficients of a compound in a balanced equation.
• is the simplest whole-number ratio of moles of elements in the compound.

What is the name of : Cr(NO₃)₃ ⋅ 9H₂O

• chromium nitrate nonahydrate

• chromium nitrogen trioxide nonahydrate

• chromium (III) nitrate nonahydrate

• chromium (I) tritrioxide heptahydrate

What is the correct chemical formula for barium hydroxide octahydrate?

• Ba(OH)₂ . 8H₂O

• Ba(OH)₂ . H₂O

• 8Ba(OH)₂ . H₂O

• Ba . 8(OH)₂

A 15.67 g sample of a hydrate of magnesium carbonate was heated to drive off the water. The mass was reduced to 7.58 g. What is the formula of the hydrate?

• MgCO₃ · 5H₂O
• MgCO₃ · 4H₂O
• MgCO₃ · 6H₂O
• MgCO₃ · 1H₂O

A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?

• Mg₄N₃
• MgN₂
• Mg₃N₂ 
• MgN

What is the empirical formula if a compound shows that it contains 0.728 g of phosphorus and 2.50 g chlorine.

• PCl

• PCl₃

• P₃Cl

• P₂Cl₆

What is the empirical formula for a compound containing the following ratio:

3Na: 1P: 4O

• NaPO₄

• Na₃P₄O

• Na₃PO₄

• NaPO

Phosphorous trichloride

• PCl₃
  
• P₃Cl
• P₃Cl₃
• PCl

A binary covalent bond exists between

• 2 metals
• 1 metal and 1 nonmetal
• 2 nonmetals
• Any 2 elements

What is the correct name for NO?

• Mononitrogen monoxide
• Nitrogen monoxide
• Mononitrogen dioxide
• Nitrogen oxide