Which of the following best describes the practice of slavery at the time of the Dred Scott case?

Slavery had expanded extensively across the continent, which made Northerners extremely nervous.

Slavery had been banned almost everywhere, which made Southerners extremely nervous.

There was a great deal of tension between the North and South over the practice of slavery.

The North and South remained in agreement about the Missouri Compromise, which had settled the slavery issue.

chemistry sucks a**

explanation:

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-