By Robert Gardner
Young scientists will discover primary chemical ideas and know about what occurs while an acid and a base combine and which solids are strong conductors of electrical energy. Many enjoyable experiments are nice rules scholars can use for technological know-how reasonable initiatives.
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Image Credit: Stephen F. Delisle FIGURE 3: The 20 nails that were added to this measuring cup caused the volume to increase from 100 ml to 115 ml. Thus 20 nails were responsible for an increase in volume of 15 ml. 75 ml/nail. Once you know the volume of the object, determine its mass by placing it on a scale. If one nail or screw does not register a noticeable increase in mass, then place ten or twenty of them on the scale. Again be sure to divide the total increase in mass by the number of objects you weighed to get the mass of just one object.
When doing these experiments, use only nonmercury thermometers, such as those filled with alcohol. The liquid in some thermometers is mercury. It is dangerous to breathe mercury vapor. If you have mercury thermometers, ask an adult to take them to a local mercury thermometer exchange location. Do only those experiments that are described in the book or those that have been approved by an adult. Never engage in horseplay or play practical jokes. Before beginning, read through the entire experimental procedure to make sure you understand all instructions.
Mass is simply how much “stuff” there is. Volume is the amount of space the “stuff” occupies. Density is a measure of how tightly matter is packed. Which of the objects shown in Figure 2 is more dense? Density is usually expressed in units of grams per milliliter, or g/ml. Another way of expressing density is in units of grams per cubic centimeter, or g/cm3. 14 g/cm3. With the use of this value, you can determine the thickness of the zinc layer on a galvanized object. In this experiment, you may want to have your science teacher check the calculations that are required in the results.