What kind of change occurs if a substance changes into a new substance?

List four observations that indicate that a chemical reaction may be taking place

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

Based on its chemical properties, identify the position of each chemical family on the periodic table.