Just a little bit of glue is enough. Dip the glue-coated tip of the skewer into the salt in the bag. Twist the skewer back and forth a bit to coat the skewer's tip with the salt. Set the skewer aside to dry. Repeat this with two more skewers so you have a total of three skewers that have their tips coated with salt.
Next, have an adult coat three more skewers with copper sulfate. Read and follow all safety precautions on the packaging that the copper sulfate came in.
Be careful not to let anybody inhale any copper sulfate dust or get any on their skin or face. If desired, use disposable gloves and safety goggles. If not using gloves, be sure not to touch the copper sulfate. Coat the last inch of the tip of a skewer in a thin layer of glue and dip the glue-coated tip into the bag of blue-colored copper sulfate, twisting it back and forth to coat the tip.
Repeat this with two more skewers so that you have three with coated tips. Allow all six of your skewers to dry. This may take about half an hour. When you later burn the skewers, be sure to do it in an open, outdoor area and be careful not to breathe the fumes or smoke from the skewers coated in copper sulfate. Adult supervision is required when using fire, burning the skewers and handling the copper sulfate. Procedure When it is dark or twilight , take your candle, matches and prepared skewers to an open area outside where you can safely burn a candle.
Be sure there is good airflow and always stand upwind of the flame so that the breeze carries the smoke away from you. Also have a container of water with you as a safety precaution. Have an adult light the candle. Once the candle is burning well and you are on the upwind side of the flame, carefully take out one of the prepared skewers and hold the chemical-coated end in the flame.
Be sure not to breathe the fumes or smoke from the burning skewer! What color does the chemical burn? How does it compare with the normal color of the candle's flame?
You may be able to see the color in the candle's flame or by holding the skewer away from the candle once the chemicals have caught fire and looking at the flame on the tip of the skewer. The skewer may also catch fire after a few moments.
If this happens, remove it from the flame and extinguish it in the container of water. Repeat this process for the other five skewers.
To help you distinguish which chemical you are burning, remember that the skewers coated in sodium chloride table salt will have white-coated tips and those coated in copper sulfate will have blue-coated ones. We leave the paper bottom on. Toss one of these patties into the hottest part of the fire. It will melt, and the show begins! Sensor Materials.
Sensor Sizes. Fluids Sensed. Sensor Decision Tree. Sample Product Request. Contact Us. Thus, an atom of Na has different energy levels and transitions than an atom of Li. The different mix of energy differences for each atom produces different colours.
Each metal gives a characteristic flame emission spectrum. Check out these videos of flame tests Related questions What periodic table elements are radioactive? How can the periodic table be used to predict the properties of the elements?
How can elements have different isotopes? How can elements be broken down? How can elements properties be predicted?
0コメント