Topic 2.1 Molecular & Ionic Compound Structure & Properties

Topic 2.1 Molecular & Ionic Compound Structure & Properties

by Ashley Saenz

Multiple Choice

Two pure elements react to form a compound. One element is an alkali metal,  X , and the other element is a halogen,  Z . Which of the following is the most valid scientific claim that can be made about the compound?

• It has the formula XZ2

• it does not dissolve in water

• it contains ionic bonds

• it contains covalent bonds 

Multiple Choice

Which of the following scientific claims about the bond in the molecular compound  HF  is most likely to be true?

• There is a partial negative charge on the H atom

• Electrons are shared equally between H & F atoms

• The bond is extremely weak

• The bond is highly polar

Multiple Choice

The elements  C  and  Se  have the same electronegativity value, 2.55. Which of the following claims about the compound that forms from  C  and  Se  is most likely to be true?

• The carbon-to-selenium bond is unstable

• The carbon-to-selenium bond is nonpolar covalent

• The compound has the empirical formula  CSe

• A molecule of the compound will have a partial negative charge on the carbon atom