A sample of an unknown pure substance X is analyzed and found to contain 7.47 g of Element E, 8.53 g of Element Ey, and no other elements. A similar analysis is made of three other substances that also only contain Elements E1 and E2. The results are shown in the table below. Decide whether each of the other substances is also a pure substance. If you don't have enough information to decide, choose can't decide. Substance Mass of E1 Mass of E2 Pure substanceA 21.0 g 6.0 g pure substance Mixture Can't decide B 13.8 g 18.2 g pure substance Mixture Can't decide C 19.6g 19.4 g pure substance Mixture Can't decide

Why do you suppose the structural polysaccharide cellulose does not contain branches? why do you suppose the structural polysaccharide cellulose does not contain branches? branches in the molecule would generate side chains that would almost certainly make it difficult to pack the cellulose molecules into globules, thereby decreasing the flexibility and strength of the globules. branches in the molecule would generate side chains that would almost certainly make it difficult to pack the cellulose molecules into microfibrils, thereby increasing the rigidity and strength of the microfibrils. branches in the molecule would generate side chains that would almost certainly make it difficult to pack the cellulose molecules into globules, thereby increasing the flexibility and strength of the globules. branches in the molecule would generate side chains that would almost certainly make it difficult to pack the cellulose molecules into microfibrils, thereby decreasing the rigidity and strength of the microfibrils.

How do you convert 4 mmol of bromobenzene to ml?

Abeaker with 2.00×102 ml of an acetic acid buffer with a ph of 5.000 is sitting on a benchtop. the total molarity of acid and conjugate base in this buffer is 0.100 m. a student adds 4.70 ml of a 0.360 m hcl solution to the beaker. how much will the ph change? the pka of acetic acid is 4.740.