7th Grade Science Midterm Auto saved at 15 20 444
Question Category: Using Newton's First Law
Select the correct answer.
Which diagram represents an object in equilibrium?
applied
force = 20 N
force due to
friction = 15 N
z
applied
force = 30 N
force due to
friction = 15 N
O
applied
force = 30 N
force due to
friction = 20 N
о
applied
force = 15 N
force due to
friction = 25 N
applied
force = 20 N
force due to
friction = 20 N

chemistry sucks a**

explanation:

the link still does not work even when adding it to the url bar

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-