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Key conceptsWaterIceChemistrySolutionsPhases of matterIntroductionDo you periodically dump ice cubes into a drink to help keep cool ~ above a warm summer day? have actually you ever watched the ice cream cubes melt and wondered just how you can make castle melt an ext slowly—or even faster? In this science activity you will acquire to shot some different, usual household building materials to shot and answer this question: What will aid a solid ice cube turn right into a fluid puddle the fastest?BackgroundTemperature isn"t the just thing the affects exactly how a liquid freezes—and melts. If you"ve ever before made homemade ice cream cream the old-fashioned method using a hand-crank machine, girlfriend probably know that you need ice and salt to frozen the cream mixture. Similarly, if you live in a cold climate, you"ve probably seen the trucks the salt and also sand the roads after a snowfall to protect against ice from building up on the roads. In both of these instances salt is lowering the freezing point of water, which way that the water needs to be colder to revolve from liquid right into ice. Because that the ice cream maker, the temperature the the ice–salt mixture can get much reduced than if just using common ice, and this makes it feasible to frozen the ice cream mixture. For the salt spread out on streets, lowering the freeze point way that ice have the right to melt also when the out temperature is listed below water’s freeze point. Both of these events show “freezing suggest depression.”Salt mixed with water is an example of a chemistry solution. In a equipment there is a solute (salt in this example) that gets liquified in a solvent (water in this case). When other substances are blended with water lock may additionally lower its freeze point. In this science task you"ll investigate exactly how salt, sand and sugar impact water"s freezing point.

You are watching: What melts ice faster salt or sugar

Materials

Four ice cream cubes (They must all it is in the same size and shape.)Four drinking glasses (They must all it is in identical.)Table saltSugarSandOne-quarter tespoon measuring spoon

Preparation

Prepare (or purchase) some ice cubes if you carry out not have any type of ready. They should all be the very same size and shape.


Procedure

Into each drinking glass place one ice cube. Make certain the ice cube is oriented the same method in each glass. (Tip: If you room using ice cubes native a tray, it help to permit the tray sit in ~ room temperature for about five minute so that the ice cubes an ext easily come out of the tray cups and also do not break into pieces.)Carefully sprinkle one-quarter teaspoon (tsp.) that salt over the ice cube in one drink glass. Climate sprinkle one-quarter tsp. That sugar over the cube in one more glass and also one-quarter tsp. Of sand over the ice in the third. Do not sprinkle anything end the ice cream cube in the 4th glass. (It will be your control.) How execute you think the salt, sugar and sand will impact how conveniently the ice cream cubes melt?Set the drinking glasses aside somewhere indoors, out of straight sunlight.Watch the ice cubes over time, checking on lock every 5 to 10 minutes. After around 30 minutes, i m sorry cube has melted the most? i m sorry is the very first one to melt completely? i m sorry is the last?Overall, exactly how do you think added salt, sugar or sand affects how quickly the ice cream melts? have the right to you define why this could be?Extra: You could try this task at different temperatures, such together in the refrigerator or exterior on a warm day. How does adding salt, sugar or sand come the cubes affect how conveniently they melt as soon as exposed come a hotter or chillier environment?Extra: In this task you used one-quarter tsp. Of every substance, but you could try adding an ext or less. Does the melting rate depend ~ above the quantity of the problem added?Extra: determine some other substances to check on the ice cubes. Do other substances help melt the cubes much more quickly or perform they end up melting much more slowly?

Observations and resultsDid the ice cube sprinkled through table salt melt the fastest?In this activity you tried adding salt, sugar or sand to ice to watch whether the substance would assist melt the ice. In various other words, you wanted to test whether these substances can demonstrate freezing allude depression, or the lowering of the ice"s freezing suggest so the it melted into a fluid at a reduced temperature than normal. You should have actually seen that the ice cube with salt sprinkled on that melted faster than any kind of of the other cubes. This is because the amount whereby the freezing suggest is lowered relies on the number of molecules dissolved, but not their chemical nature. (This is an instance of what"s referred to as a "colligative property.") In the same volume over there are an ext molecules of salt 보다 there room of sugar or sand due to the fact that the chemical materials that make up the salt are much smaller 보다 the sugar or sand.

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CleanupBe certain not to pour the sand down a sink drain or garbage disposal! Instead, throw the end the wet sand exterior or in a rubbish can.More to exploreSalt and Icy Roads, from science KidsHow walk Salt Melt Ice and also Snow?, native HighlightsWhat renders Ice Melt Fastest?, from scientific research BuddiesMake ice cream Cream in a Bag, from scientific research Buddies