Which of the following definitions characterizes an element? a. can only be broken down by chemical means b. contains a basic combination of two or more substances c. contains only one type of atom d. can be separated through physical means

Idont really know sorry

Answer///precipitate;

The answer is the third choice

The reaction 2kalsi3o8 + 2(h+ + hco3-) + h2o  →  al2si2o5(oh)4 + 2k+ + 2hco3- + 4sio2 shows that feldspar kalsi3o8 is chemically altered by hydrolysis to form chalky-looking clay mineral kaolinite al2si2o5(oh)4. the chemical breakdown of potassium feldspar due to exposure to acidic water results to the mineral binding with the water molecule to become kaolinite with silica and potassium and bicarbonate ions in solution.