I'm really
which of the following chemical reactions is an oxidation-reduction reaction?
a. cuso4 + bacl2 > baso4 + cucl2
b. agno3 + nacl > agcl + nano3
c. pb(no3)2 + 2nacl > pbcl2 + 2nano3
d. zn + h2so4 > znso4 + h2

Classify each statement about effective nuclear charge, zeff, as true or false.

How many liters of hydrogen gas will be produced at stp from the reaction of 7.179×10^23 atoms of magnesium with 54.219g of phosphoric acid (h3po4) the equation is 3mg + 2h3(> mg(po4)2+3h2

The covalent compound acetylene, which is the fuel of the oxyacetylene torch used by welders, has the molecular formula c2h2. the covalent compound benzene, a commercial solvent, has the molecular formula c6h6 each of these covalent compounds contains carbon and hydrogen atoms in a one-to-one ratio. would it be correct to write the chemical formulas of each as ch? explain.