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3 years ago

Which of the following changes can alter the form of a substance but does not necessarily change it to the other substance?

Chemistry

1 answer:

zheka24 [161]3 years ago

5 0

D - by undergoing all of these changes you would still be left with the same substance

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Logan is cooking, and he wants to increase the boiling point of the water. Which solute would not be a good choice as it would n

Mars2501 [29]

Sugar would not increase the boiling point of the water as much as the others.To show this, we recall the equation for boiling point elevation ∆t:
∆t = i Kb m

The difference in these four solutions will be in the product of the van't Hoff Factor i and molality m: i * m.

If we assume that we have 0.1m of each solute, the products i*m for these solutions are:

Solution Identity of particles   i i * m
0.1 m NaCl Na+, Cl-    2 2 * 0.1 = 0.2
0.1 m MgSO4 Mg^2+, SO4^2- 2 2 * 0.1 = 0.2
0.1 m K2SO4 two K+, SO4^2- 3 3 * 0.1 = 0.3
0.1 m C12H22O11 covalently bonded molecules 1 1 * 0.1 = 0.1

Therefore, having the lowest i * m, sucrose will have the lowest boiling point elevation.

8 0

3 years ago

Where dose the energy that drives the rock cycle come from

Elan Coil [88]

Answer:

It comes from the sun.

6 0

2 years ago

Is pepperoni pizza a compound or mixture?

stiks02 [169]

Answer:

Mixture.

Pizza is a mixture of a lot of things like dough, sauce, meat, veggies, cheese, etc.

Each of those things is a mixture of other things like proteins, starches, sugars, water, fiber, vitamins, minerals, etc.

3 0

3 years ago

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Who discovered that geologic changes are cyclical?

slega [8]

I believe it was James Hutton

7 0

3 years ago

Based upon the mass of baking soda (NaHCO3) and using an excess of HCl in this experiment, you will 1) determine the mass of CO2

weqwewe [10]

Equation of reaction

NaHCO3 + HCl ---------> NaCl + H2O + CO2(g)

1)The mass(actual yield) of CO2 can be gotten by isolating it from other products and getting its mass.

Assume 1.0g of CO2 was gotten as a product of the experiment

2) For the theoretical yield

The mass of NaHCO3 was not stated, but for the purpose of this solution, I would assume 2g of NaHCO3 was used for the experiment. You can substitute any parameter by following the steps I follow

Number of mole of NaHCO3 = Mass of NaHCO3/ Molar Mass of NaHCO3

Number of mole of NaHCO3 = 2/84.01 = 0.0238 moles

1 mole of NaHCO3 yielded 1 mole of CO2

0.0238 moles of NaHCO3 will yield 0.0238 moles of CO2

Mass of CO2 = Number of moles * Molar Mass

Mass of CO2 = 0.0238 * 44 = 1.0472g

Theoretical yield of CO2 = 1.0472 grams

3) Percentage yield of CO2 = Actual yield/Theoretical yield *100%

Percentage yield of CO2 = 1.0/1.0472 *100

Percentage yield of CO2 = 95.49%

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3 years ago

Read 2 more answers