Which of these can be classified as a pure substance a. solution b. heterogeneous mixture c. compound d. homogeneous mixture

C. Compound, a pure substance is a compound.

Compound is the  pure substance

   Explanation

A compound is a pure substance which is made up of two or  more differences atoms which are chemically bonded to one another.compound cannot be physically separated.On other side  if the substance is not  chemically  pure it is referred to as heterogeneous or homogeneous mixture.  solution is an example of  a mixture therefore it no t pure.

Read the sentences below in 1962, i tried to enroll as the first black student at the university of mississippi. the governor of mississippi blocked my entrance which best describes the verbs used in the sentences? o they are past tense verbs, which are often used in narrative essays o they are past tense verbs, which are not often used in narrative essays. o they are future tense verbs, which are often used in narrative essays o they are future tense verbs, which are not often used in narrative essays.