Which of the following elements will most likely form ions with a –2 charge? a) Cr b) Sr c) Se d) N

Sodium Chloride yellow color Cu(I) Oxide Cu₂0 blue color 3. In addition to vivid colors, the fireworks also use other visual features such as smoke, glitter effects, or delay in the firing train. Write correct ionic formulas for the following compounds used to create these effects: Ammonium (NH) Chloride. white smoke Zinc Oxide smoke Bismuth (III) Oxide Barium Chromate (CrO42-) Magnesium Carbonate (CO32-). MATERIALS Laboratory (Bunsen) Burner and Lighter (or Matches). Cotton Swabs (or wood sticks can be used with one side wrapped in cheese cloth or small pieces of cotton). crackling microstars delay charge glitter-delay Approximately 50 mL of Distilled Water. Approximately 20 mL of Dilute Hydrochloric Acid (3 M HCI). Spot Plates (or 16 small pieces of paper or weighing dishes). Compounds: Sodium Chloride Sodium Carbonate Strontium Acetate Copper(II) Oxide Potassium Nitrate Cobalt(II) Chlorido

Predict the chemical formulas for the binary compounds that hydrogen forms with the elements arsenic, chlorine, carbon, and polonium.