Regents Chemistry Breaking Forming Bonds

Which substance contains bonds that involved the transfer of electrons from one atom to another?

• KBr

• CO₂

• Cl₂

• NH₃

As a chlorine atom becomes a negative ion, the atom

• loses an electron and its radius increases

• gains an electron and its radius decreases

• loses an electron and its radius decreases

• gains an electron and its radius increases

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A neutral atom with the electron configuration 2-6 would most likely form a bond with an atom having the configuration

• 2

• 2-2

• 2-8

• 2-8-8

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Compared to a calcium atom, the calcium ion Ca⁺² has

• more protons

• more electrons

• fewer protons

• fewer electrons

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The bonds in BaO are best described as

• ionic, because valence electrons are transferred

• covalent, because valence electrons are transferred

• covalent, because valence electrons are shared

• ionic, because valence electrons are shared

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Which compound has the least ionic character?

• AlCl₃

• CCl₄

• CaCl₂

• KCl

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Which statement best describes the substance that results when electrons are transferred rom a metal to a nonmetal?

• It contains covalent bonds and has a high melting point

• It contains covalent bonds and has a low melting point

• It contains ionic bonds and has a low melting point

• It contains ionic bonds and has a high melting point

A substance that does not conduct electricity as a solid but does conduct electricity when melted is most likely classified as

• an ionic compound

• a nonmetal

• a metal

• a molecular compound

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Element X is in Group 2 and element Y is on Group 17. What happens when a compound is formed between these two atoms?

• X loses electrons to Y to form an ionic bond

• X gains electrons from Y to form an ionic bond

• X loses electrons to Y to form a covalent bond

• X gains electrons from Y to form a covalent bond

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A solid substance was tested in the laboratory. The test results are listed below:

• dissolves in water
• is an electrolyte
• melts at a high temperature

Based on these results, the solid substance could be

• C₆H₁₂O₆

• CH₄

• H₂O

• CuBr₂

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