Question

1. the initial mixture of all four substances can be classified as a __ mixture, and the final mixture of alcohol and substance d can be classified as a __ mixture. (a) heterogeneous; heterogeneous (b) homogeneous; homogeneous (c) homogeneous; heterogeneous (d) heterogeneous; homogeneous each substance in the table below corresponds to one of the unknown substances, a - d. 16. based on the data table above, which of the following sets correctly pairs each unknown substance letter with the appropriate identity? (a) a = neodymium powder, b = ammonium chloride, c = benzoic acid, d = lead chloride (b) a = lead chloride, b = benzoic acid, c = neodymium powder, d = ammonium chloride (c) a = ammonium chloride, b = lead chloride, c = neodymium powder, d = benzoic acid (d) a = benzoic acid, b = lead chloride, c = neodymium powder, d = ammonium chloride

Explanation:

Neodymium powder is magnetic, so it can be separated from the other substances using a magnet. The initial mixture of all four substances would have visible differences (since neodymium is a different - looking powder), making it heterogeneous. Ammonium chloride is soluble in alcohol, benzoic acid is soluble in alcohol, and lead chloride is insoluble in alcohol. When we have a mixture of alcohol and substance D (lead chloride which is insoluble in alcohol), we can see the undissolved particles, so it is heterogeneous.

Answer:

A. A = neodymium powder, B = ammonium chloride, C = benzoic acid, D = lead chloride