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Why does NaCl lower the freezing point of water by twice as much as sucrose?
Wiki User
∙ 11y ago
If the solutions have the same molality, the salt will produce twice as many dissolved particles (Na+ ions and Cl- ions) but the sugar does not dissociate into particles when dissolved.
Wiki User
∙ 11y ago
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What are the units of measurements in temperature?
Temperature is almost always stated in 'degrees', but there are several different systems. The differences are: -- the size of the degrees -- where their zero-point is, i.e. where they begin counting. Here are a few examples: Celsius: Zero point is the freezing temperature of water. Boiling point of water is called '100 degrees'. So the size of the degree is 1/100 of the difference. Fahrenheit: Freezing point of water is called '32 degrees'. Boiling point of water is called '212 degrees'. So the size of the degree is 1/180 of the difference. Kelvin: Zero point is 'absolute zero' ... the temperature where the 'thermal' motion of all molecules completely stops. Size of one "Kelvin" is the same as one Celsius degree. Freezing temperature of water is 273.15 Kelvins. Rankine (hardly ever used): Zero point is 'absolute zero'. Size of the degree is the same as Fahrenheit. Freezing point of water is 459.67 degrees Rankine. Reaumur (never used any more): Freezing point of water is called 'zero degrees'. Boiling point of water is called '80 degrees'. So the size of the degree is 1/80 of the difference.
Used as an alloy in ball point pens nearly twice as dense as lead the strong odor given off by this metal is a result of its highly toxic oxide?
osmium
What does it mean when lightning strikes twice?
Many people (not necessarily scientiest or meteorologists) think that lightning will not strike the same place twice. So they say that it is rare for lightning to strick twice, meaning twice at the same place. This term is used to imply something that is rare.
If the temp today is 0 degrees celsius today temp tomorrow is twice as cold what will the temp be?
this is sorta a trick question because you cant have twice as cold, there is no such thing as cold just absence of heat...think about it so say its 100 deg celsius, can you still say twice as cold as 100 deg? nope
What occurs twice each day in an ocean?
High tide and low tide both usually occur twice in 24 hours.
What would happen to the freezing point of the substance that you worked with if there was twice as much liquid in the test tube?
Nothing. The freezing point depends on the molecular structure, not the volume of the substance. It will take a longer time to freeze twice the amount of liquid, but the freezing point remains the same.
Will elevation in boiling point be same for 0.1 m NaCl and 0.1m sucrose solution?
No, if both substances are dissolved in water, because sodium chloride spontaneously dissociates into two ions that act independently in raising the boiling point, while dissolved sucrose does not dissociate into entities smaller than molecules. Therefore, 0.1 m NaCl will raise the boiling point about twice as much as 0.1 m sucrose.
Do salt water freeze faster than sweet water?
How much salt and how much sweet?By the way, which freezes "faster" is not a question that scientists tend to study a lot. They're more likely to be interested in the freezing point. At the same temperature, something with a lower freezing point will probably freeze slower, but quantifying this is complicated.Anyhow, that aside, adding any solute to a solvent lowers the freezing point. The amount the freezing point is lowered depends on the solvent and on the amount of solute that was added (measured in moles). Solutes that dissociate into multiple species in solution count multiple times (so adding one mole of table salt, which dissociates into one mole of sodium ions and one mole of chloride ions, lowers the freezing point of a certain amount of water twice as much as adding one mole of sugar, which doesn't dissociate). However, remember that it's the number of moles, not the volume or weight directly, that matters.If you have specific quantities in mind, you could calculate the molality of the resulting solutions (remember that table salt counts twice) and multiply that by the molal freezing point depression of water (about 1.85 K kg/mol) to find out exactly how much the freezing point was lowered in each case.
Would the ratio of solute to solvent in a sucrose solution be the same as in a glucose solution?
No. For the physical formula ratio, of [solute:solvent] to be the same, you would have to use twice as much glucose as sucrose, to make the solution; because sucrose is a disaccharide. But, when preparing the solution, the actual weight used will be approximately the same. You have a solution, with solute sucrose, at 1C ratio. Weighing the same amount of glucose (in grams), will make a solution of 2C ratio. General expression is Glucose:Sucrose::2:1.
The height of a wave is twice the measure of its what?
The height of the wave, above the rest position, is its Amplitude. Twice the amplitude is the distance from the deepest point to the highest point.
Is the b flat clarinet is twice as long as the bass clarinet and sounds an octave lower?
Nope. Other way around. The bass clarinet IS twice as long as the Bb one, and IS an octave lower.
What are the units of measurements in temperature?
Temperature is almost always stated in 'degrees', but there are several different systems. The differences are: -- the size of the degrees -- where their zero-point is, i.e. where they begin counting. Here are a few examples: Celsius: Zero point is the freezing temperature of water. Boiling point of water is called '100 degrees'. So the size of the degree is 1/100 of the difference. Fahrenheit: Freezing point of water is called '32 degrees'. Boiling point of water is called '212 degrees'. So the size of the degree is 1/180 of the difference. Kelvin: Zero point is 'absolute zero' ... the temperature where the 'thermal' motion of all molecules completely stops. Size of one "Kelvin" is the same as one Celsius degree. Freezing temperature of water is 273.15 Kelvins. Rankine (hardly ever used): Zero point is 'absolute zero'. Size of the degree is the same as Fahrenheit. Freezing point of water is 459.67 degrees Rankine. Reaumur (never used any more): Freezing point of water is called 'zero degrees'. Boiling point of water is called '80 degrees'. So the size of the degree is 1/80 of the difference.
Is it twice the stopping distance for a car in freezing conditions?
No - the stopping distance depends on the speed of the vehicle - it' not simply a case of 'doubling-up'.
Can you freeze pork twice?
Yes . Freeze it . then unfreeze it . then freeze it again . Keep doing those steps until you get to the amount of freezing or unfreezing numbers you get .
What is 28.6 percent as a decimal?
28.6% is 0.286 as a decimal.Tip: Move the decimal point twice to the left when converting into decimal; move the decimal point twice to the right when converting into percentage.
When does the sale take place?
when you lower your price every one or twice a month
Does and ice cube with salt melt faster or sugar?
Well. Bear with me here, this answer will be a little on the complicated side. The reason that solutes, like salt or sugar, melt ice is because of something called "freezing point depression" ... the salt (or sugar, or other solute) lowers the melting point of the ice. Freezing point depression is what physical chemists call a "colligative property." These doesn't depend on what the substance is, only how many dissolved "things" there are. Sugar is a covalent compound. It dissolves in water, but each sugar molecule produces only 1 "thing" ... the entire sugar molecule. Salt is an ionic compound. When it dissolves in water, for each formula unit 2 "things" are produced ... a sodium ion and a chloride ion. That means that sodium chloride is twice as effective per mole at lowering the freezing point of water as sugar is. How about by weight? A formula unit of sodium chloride is about 58.5 amu; a molecule of sugar ... well, there are lots of sugars; for simplicity's sake let's take table sugar with the formula C12H22O11. It's got a molecular weight of about 342 amu, nearly 6 times that of sodium chloride. Since sodium chloride is already twice as effective per mole, by weight it lowers the freezing point around 12 times as much as sugar does. This is one reason we use salt instead of sugar on our sidewalks in winter: it takes a lot less.
