Please help asap !! i don’t know if that’s the right answer

b, c and d (last three options)

Explanation:

It can't be the first one because:

On the left hand side there is one of everything and then on the right, ther is one zinc, two chloride and 2 hydrogen atoms. It is unbalanced

Second one:

there are 8 carbons on both sides, 20 hydrogens on both sides and 26 oxygen on both sides. It is balanced

Third

1 copper on both sides, 2 hydrogens on both sides and 1 oxygen on both sides. It is balanced

Fourth

4 silver on both sides and 2 oxygens on both sides

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)