Question 17
metal ions in water can react with soap to form
a)acid-base indicators
b)detergents
c)salts
d)soap

Metal ions in water can react with soap to form salts. ( option C)

Explanation:

Soaps have the general formula (RCO2−)nMn+ (Where R is an alkyl, M is a metal and n is the charge of the cation).

C17H35COO- Na+

The class of soaps is determined by the identity of Mn+. Those can be mettalic or lithium soaps.

Let's consider those metals are calcium or magnesium ions, dissolved, with soap, in the water, we'll find that the sodium ion (Na+)  at the polar end of the soap molecule is replaced by a metal ion such as calcium or magnesium ion. This will result in a salt, ( better said an insoluble fatty acid) salt.

This can be shown with the following reaction:

2 C17H35COO- Na+ + Ca2+  → (C17H35COO)2Ca + 2Na+

This results in Calcium stearate, which is the calciumcarboxylate  (calcium salt) of stearic acid.

Metal ions in water can react with soap to form salts.

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.

the answer is c.

by: nicholas dooley