Why is NH3 not dried over
anhydrous CaCl2?

vWhich expression could be modeled using the diagram?

An area model has 4 shaded parts and 1 unshaded part. The shaded parts are labeled StartFraction 4 Over 5 EndFraction.

4 divided by one-fifth

4 divided by StartFraction 4 Over 5 EndFraction

StartFraction 4 Over 5 EndFraction divided by one-fifth

One-fifth divided by StartFraction 4 Over 5 EndFraction

Explanation:

Which expression could be modeled using the diagram?

An area model has 4 shaded parts and 1 unshaded part. The shaded parts are labeled StartFraction 4 Over 5 EndFraction.

4 divided by one-fifth

4 divided by StartFraction 4 Over 5 EndFraction

StartFraction 4 Over 5 EndFraction divided by one-fifth

One-fifth divided by StartFraction 4 Over 5 EndFraction

c

explanation:

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.