Chemistry Final Completion

In the chemical reaction represented by the equation 2Cr (s) + 3O2 (g) yields 2CrO3 (s), two chromium atoms combine with ____ oxygen atoms.

6

The reaction represented by the equation Mg(s) + 2HCl(aq) yields H2(g) + MgCl2(aq) is classified as a(n) ___________ reaction.

single displacement

In the chemical equation 2AlCl3(aq) + 3Pb(NO3)2 (aq) yields 3PbCl2(s) + 2Al(NO3)3(aq) , the state of PbCl2 is a(n)___________

solid

The reaction represented by the equation 2HgO (s) yields 2Hg (l) + O2 (g) is classified as a(n) __________ reaction.

decomposition

When placed in water, a metal more active than hydrogen will form two substances, a metal hydroxide and _______ gas.

hydrogen

In writing a formula equation for a reaction that produces hydrogen gas, the correct representation of hydrogen gas is _________

H2