The number-average molecular weight of a polypropylene is 663419 g/mol. Compute the degree of polymerization (Key in your answer as the whole number only. Avoiding round-off error by using all the numbers during intermediate steps.

Answer:

The glass cup falling from the counter

Explanation:

the glass isn't changing in any chemical way. it's still made of the same material, just broken apart.

Final answer:

Physical changes involve the alteration of the state or appearance of matter, without changing the composition. An example is solid wax turning into liquid wax when heated, or steam condensing inside a cooking pot.

Explanation:

The question asks for an example of a physical change. Physical changes involve alterations in the state or appearance of matter, without changing its composition. For example, solid wax turning into liquid wax when heated is a physical change. The wax is still the same substance, it's just in a different state. Similarly, steam condensing inside a cooking pot is also a physical change. The water vapor turns back into liquid water, but it's still water. These are distinguished from chemical changes, which transform one substance into a different substance.

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The heat that is required to change the temperature of two cups of water (500 g) from room temperature (25◦C) to boiling

C) 157 kJ

Heat

Heat required= Mass of water x specific heat capacity of water x change in temperature of water required

Q=m* c* delta T

M = 500g

C = 4.184 g°C

Delta T = 100 - 25(room temp) = 75°C

Heat = 500 x 4.184 x 75

Heat = 156900 J

Heat = 156.9 KJ

Heat ~ 157.0 KJ (3.D.P)

Thus, the correct answer is C.

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Answer:

C

Explanation:

Heat required= Mass of water x specific heat capacity of water x change in temperature of water required

M = 500g

C = 4.184 g°C

Delta T = 100 - 25(room temp) = 75°C

Heat needed= 500 x 4.184 x 75

= 156900 J

= 156.9 KJ

~ 157.0 KJ (3.D.P)

Answer:

D. Y will replace ions of X in a solution

Explanation:

If metal X is lower than metal Y on the activity series, then Y will replace ions of X in a solution.

This is the crux of single displacement reactions.

• In a single displacement reaction, a metallic ion in solution is replaced by a metal higher in the activity series than the metal in solution.
• On the activity series, metals higher are more reactive and will displace the lower and less reactive ones.
• Reactivity increases up the group.

The value of the van't Hoff factor for the given solute is 2.7

Option (A) 2.7 is correct.

What is van't Hoff factor?

The Van't Hoff factor is a measure of a solute's effect on colligative qualities such boiling point elevation, osmotic pressure, and relative vapor pressure reduction.

Given,

Molar mass is 132.15 g/mol

Boiling point elevation is 102.5 °C

kb for water is  0.512°c/m

Molarity of solution is 1.83 m

The value of van't Hoff factor is: 2.66 or 2.7 (approx)

Now, from the solution of colligative properties to calculate elevation in boiling point.

where Δ = elevation of boiling point (102.5)

Thus, The value is 2.7 option (A) is correct.

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We need to know the value of van't hoff factor.

The van't hoff factor is: 2.66 or 2.7 (approximately)

(NH₄)₂SO₄ is an ionic compound, so it dissociates in solution and produces 3 ionic species. Therefore van't hoff factor is more than one.

From the equation: Δ=i .m, where Δ= elevation of boiling point=102.5 - 100=2.5°C.

m=molality of solute=1.83 m (Given)

= Ebullioscopic constant or Boiling point elevation constant= 0.512°C/m (Given)

i= Van't Hoff factor

So, 2.5= i X 0.512 X 1.83

i=

i=2.66= 2.7 (approx.)