Do the following experiment. For this experiment on solutions, you will need: sugar cubes
regular granular sugar
three glasses
a spoon
water
You will be dissolving the sugar. Make a chart with three columns with the headings “Water Temperature,” “Sugar Size,” and “Stirred/Not stirred.”

a. Fill one glass with cold water, one with warm water, and one with hot water. Measure one teaspoon of regular granular sugar into each glass. Do not stir the liquid. Using your watch, time how long it takes for the sugar to dissolve in each glass. Record your results on the chart.

b. Try the same thing, but this time place one sugar cube in each glass. Do not stir the liquid. Using your watch, time how long it takes for the sugar cube to dissolve in each glass. Record your results on the chart.

c. Now repeat steps a. (regular sugar) and b. (sugar cube), but this time try stirring the glasses of water each time. Using your watch, time how long it takes for the sugar to dissolve in each glass. Record your results on the chart.

2. Based on the results, what conclusions can you draw. Record your conclusions and any observations in the data table.

gas

explanation:

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pre-sliced bread is a relatively recent development in baking technology. previous to that, it was always sold in a bakery in daily-made contiguous loaves with no wrapping, and was moderately perishable, usually being used with a day or two (which is why every bakery had a discounted “day-old” bread table.) therefore, pre-sliced bread would grow stale quickly. the hard crust provided a protective layer, and once the exposed dry slice left from the previous cut was removed, the interior was still soft.

what keeps bread soft is the moisture retained in the crumb (the light spongy part that’s not crust). the reason the crust develops is the surface of the dough gets exposed to hot dry air during baking which browns the outer layer and seals it, preventing all the moisture from escaping the dough. longer exposure to air will also eventually cause your bread to lose flavor and become stale.

people were used to cutting slices as they needed them and storing bread in a specially-made wooden or metal breadbox or pail with a lid to preserve it longer, but the first automatically sliced commercial loaves were produced on july 6, 1928, in chillicothe, missouri, using a machine invented by otto rohwedder, an iowa-born, missouri-based jeweler.[1] pre-sliced bread would indeed dry out, were it not for another 20th century technology: the plastic bag. bread could now be pre-sliced, and if the enclosing bag remains sealed as much as possible, the bread will remain soft and fresh for longer than if sitting unwrapped on a shelf or enclosed in a bread box that is not air-tight. sealed packaging meant bread could also be sold on store shelves and eliminate frequent trips to a bakery.

sealing bread in a plastic bag had another effect: the moisture in the loaf will re-distribute into the crust and soften it, which is sometimes more pleasing in a sandwich - especially for children whose teeth might not yet be strong enough to tear through a hard crust. a homemade loaf of bread can be sealed in a bag overnight and the crust will become soft like store-bought sandwich bread.

these were novel changes in how bread was produced and sold, which led to the coining of the phrase “the greatest thing since sliced bread.”

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.