When ammonium nitrate crystals are dissolved in water, heat energy is taken in. A student puts some water in a beaker. He puts a thermometer in the water. He adds some ammonium nitrate crystals
and stirs the mixture.
Describe what the student would see.

Match term definition ellipse a) diagonal cross section of a cylinder circle b) diagonal cross section through the widest part of a sphere sphere c) cross section parallel to the base of a cone great circle d) shape created when a semi-circle is rotated around the y-axis triangle e) perpendicular cross section of a cone

Calculate the molar mass of aluminum oxide (al2o3). express your answer to four significant figures.

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?