A 0.250 g sample of impure sodium carbonate required 18.29ml of 0.1055M HCI in a titration to methyl orange end point. The percent of Na2CO3 (FW 106 g/mol)in the sample.
Select one:
O a. 10.23%
O b. 42.91%
O c. 40.905%
O d. 20.46%​

Covalent bonds generally form when the bonded elements have a difference in electronegativity less than 1.5. subtract the electronegativities for the following pairs of elements and predict whether they form a covalent bond. electronegativity difference of c and c: ionic covalent electronegativity difference of mg and cl: ionic covalent

The comparison of the number of atoms in a copper coin the size of a penny with the number of people on earth is made to illustrate which of the following? a. that atoms are indivisible b. that atoms are very small c. that atoms are very large d. that in a copper penny, there is one atom for every person on earth

Which of the following is in the lanthanide family? a) uranium b) promethium c) silver d) gold