The difference between the boiling point of a pure solvent and the boiling point of a solution of a nonelectrolyte in the same solvent is called the ___________________, a colligative property.A. boiling-point elevation
B. freezing-point depression
C. molar freezing-point constant
D. molal melting-point constant
E. molal boiling-point constant

Answers

Answer 1

Answer: Answer: A) Boiling-Point Elevation

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Which of the following solutions would show the greatest conductivity at 30°C?A. 0.20 M Ca(NO₃)₂
B. 0.25 M HCl
C. 0.30 M NaOH
D. 0.10 M NaCl
E. 0.40 M CH₃OH

Answers

Your answer will be A

#1: Which of the following is an exothermic reaction? A. dissolving ammonium nitrate in water to cool the water B. condensation C. melting ice D. dissolving sugar in water. #2: Two objects (A and B) of the same temperature are in contact with each other. Which of the following statements is true? A. Heat transfers from object B to object A, because molecules from B collide with those from A. B. Heat transfers from object A to object B, because molecules from A collide with those from B. C. Although the molecules collide, no heat transfers because there is no temperature difference between the objects. D. No heat transfers, because there are no collisions between the molecules of the objects. #3: Which of the following parameters is kept constant in a coffee-cup calorimeter? A. temperature B. volume C. pressure D. kinetic energy #4: What type of substance would be best for use in a heating system? A. a liquid with a high specific heat B. a solid with a high specific heat C. a liquid with a low specific heat D. a gas with a low specific heat. #5: The reaction 2 NO(g) → N2(g) + O2(g) has a ΔH = -180.5 kJ. How much heat will be required to produce 44.8 L of NO by the reverse reaction? A. 644 kJ B. 180.5 kJ C. 301 kJ D. 322.3 kJ

Answers

These are the following answers to the five questions:
(1) (B) condensation. Condensation is exothermic, but it's not a reaction, it's a physical change.
(2) (C) Although the molecules collide, no heat transfers because there is no temperature difference between the objects.
(3) (C) pressure
(4) (A) a liquid with a high specific heat
(5) Supposing the NO is measured at STP:
(44.8 L) / (22.4 L/mol) x (180.5 kJ / 2 mol NO) = (B) 180.5 J

(1) (B) condensation. Condensation is exothermic, but it's not a reaction, it's a physical change.

(2) (C) Although the molecules collide, no heat transfers because there is no temperature difference between the objects.

(3) (C) pressure

(4) (A) a liquid with a high specific heat

(5) Supposing the NO is measured at STP:

(44.8 L) / (22.4 L/mol) x (180.5 kJ / 2 mol NO) = (B) 180.5 J

Liquid petrol does not ignite spontaneously in air

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The statement "Liquid petrol does not ignite spontaneously in air" is true. It needs a light nenergy or a spark for the combustion reaction to occur. Without it, it would not ignite spontaneously in air

What is the hardest form of carbon

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The hardest form of carbon is diamond.

i believe the answer is diamond. hope this helps!

What is the correct formula for calculating pH?

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PH = - log [ H⁺ ] for POH = - log [ OH⁻]

hope this helps!

Paige heated 3.00 g mercury (II) oxide (HgO, 216.59 g/mol) to form mercury (Hg, 200.59 g/mol) and oxygen (O2, 32.00 g/mol). She collected 0.195 g oxygen. What was the percent yield of oxygen?