The top of the syringe is a circle. You need to

compute its area for use in later computations of

pressure values. Start by using a ruler to measure

the diameter. Estimate to the nearest 0.01 cm.

cm

Solubility would be your answer.

Sorry i dont understand the question can you rephase it?

Combustion is the act or process of burning. therefore, i believe the answer is  a: burning wood. 

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.