Answers ChemistryChemical Bonding and Reactions

Chemical Bonding and Reactions — Test Answers

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Which of these is a property of a substance that is composed of atoms that are held together by ionic bonds?

It can be shaped into wires.

It has a low melting point.

It conducts electricity when it is dissolved in water.

It conducts electricity when in solid form.

Which statement best characterizes chemical reactions?

They rarely occur in the natural environment.

Their rates vary significantly.

Their rates are always slow.

They always occur very quickly.

Which pair of elements would form an ionic bond?

strontium Sr and chlorine Cl

magnesium Mg and aluminum Al

cesium Cs and germanium Ge

carbon cap c and oxygen cap o

Which pair of atoms would form a covalent bond ?

cesium Cs and nitrogen cap n

rubidium Rb and sulfur cap s

oxygen cap o and chlorine Cl

calcium Ca and bromine Br

Which statement best describes what happens next?

Chlorine becomes an anion by gaining an electron from sodium.

Sodium becomes an anion by losing an electron to chlorine.

Sodium becomes a cation by gaining an electron from chlorine.

Chlorine becomes a cation by losing an electron to sodium.

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