Question 138
Complete this table about some elements and compounds. The first one has been done for you.
| Chemical formula | Name of substance | Number of atoms of each element in formula | Is it an element? | Is it a compound? |
|---|---|---|---|---|
| $CaCl_2$ | calcium chloride | 1 calcium atom; 2 chlorine atoms | no | yes |
| $Cr_2O_3$ | chromium oxide | ___ | ___ | ___ |
| $CuCO_3$ | copper carbonate | ___ | ___ | ___ |
| $O_2$ | ___ | ___ | ___ | ___ |
| $FeO$ | iron oxide | ___ | ___ | ___ |
| Chemical formula | Name of substance | Number of atoms of each element in formula | Is it an element? | Is it a compound? |
|---|---|---|---|---|
| $CaCl_2$ | calcium chloride | 1 calcium atom; 2 chlorine atoms | no | yes |
| $Cr_2O_3$ | chromium oxide | ___ | ___ | ___ |
| $CuCO_3$ | copper carbonate | ___ | ___ | ___ |
| $O_2$ | ___ | ___ | ___ | ___ |
| $FeO$ | iron oxide | ___ | ___ | ___ |
