in a beaker,a mixture of merCurt and water is taken. which one will float on other???????????
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Answers
Mercury is an element, and although it's a liquid at room temperature, it is very heavy. Not only does it sink in water, but heavy solid objects, such as iron cannonballs, will actually float in a pool of the silvery metal.
Mercury is a metallic element and has a density of 13.5 grams per cubic centimeter (0.49 pounds per cubic inch). This means that the density of mercury is approximately 13 times greater than that of water. Therefore, some objects that sink in water will float on mercury, including pieces of lead, silver and steel.
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Answer:
Students will observe three household liquids stacked on each other and conclude that their densities must be different. They will predict the relative densities of the liquids and then measure their volume and mass to see if their calculations match their observations and predictions.
Objective
Students will be able to determine whether a liquid will sink or float in water by comparing its density to the density of water.
Evaluation
Download the student activity sheet, and distribute one per student when specified in the activity. The activity sheet will serve as the “Evaluate” component of each 5-E lesson plan.
Safety
Make sure you and your students wear properly fitting goggles. When using isopropyl alcohol, read and follow all warnings on the label. Isopropyl alcohol is flammable. Keep it away from any flames or spark sources.
Materials for Each Group
Balance
Isopropyl alcohol, 70% or higher
Water
Graduated cylinder
2 identical tall clear plastic cups
2 tea light candles
Materials for the Demonstration
Balance
Isopropyl alcohol, 70% or higher
Water
Graduated cylinder
2 identical tall clear plastic cups
2 tea light candles
Notes about the Materials
Isopropyl alcohol
The demonstrations and activity work best with 91% isopropyl alcohol solution, which is available in many grocery stores and pharmacies. If you can’t find 91% solution, 70% will work, but your candle might not sink in it. If that happens, do not do that demonstration. Although the isopropyl alcohol solution is 91% alcohol and 9% water, you can disregard the small amount of water for the purpose of this lesson.
Balance
A simple balance is all that is required for the second demonstration. One of the least expensive is Delta Education Primary Balance (21-inch) Product #WW020-0452 (21-inch). Students can use the smaller version of the same balance, Delta Education, Primary Balance (12-inch), Product #WW020-0452.
Engage
Do two demonstrations to show that different liquids have different densities.
Materials
Balance
Isopropyl alcohol, 70% or higher
Water
Graduated cylinder
2 identical tall clear plastic cups
2 tea light candles
Teacher preparation
Use a graduated cylinder to measure 50 mL of water and pour it into a clear plastic cup.
Measure 50 mL of isopropyl alcohol and pour it into another identical clear plastic cup.
Procedure
Demonstrate the density of two liquids with sinking and floating
Place a tea light candle in a cup with water and another tea light candle in a cup with alcohol.
Hold up the two cups.
Expected results
The candle will float on water and sink in alcohol.
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