All categories

4 years ago

The boiling point of an aqueous solution is 101.02 °C. What is the freezing point?

1 answer:

3 0

Colligative properties calculations are used for this type of problem. Calculations are as follows:

ΔT(boiling point) = 101.02 °C - 100.0 °C= 1.02 °C
ΔT(boiling point) = (Kb)m
m = 1.02 °C / 0.512 °C kg / mol
m = 1.99 mol / kg

ΔT(freezing point) = (Kf)m
ΔT(freezing point) = 1.86 °C kg / mol (1.99 mol / kg)
ΔT(freezing point) = 3.70 °C
Tf - T = 3.70 °C
T = -3.70 °C

You might be interested in

Calcium and bromine have formed a bond. Leading up to this, calcium gave up electrons. It was a(n) ____.

Savatey [412]

Answer:

C. Positive Ion

Explanation:

7 0

3 years ago

The products of a chemical reaction have different properties than the reactants.

Marta_Voda [28]

Answer:

Explanation:

The products of a chemical reaction have different properties than the reactant because they underwent a chemical change by definition of a chemical reaction. The products are new combinations atoms forming different molecules.

5 0

2 years ago

What causes hot air to rise, and cool air to sink?

nataly862011 [7]

Answer:

hot air rises because gases expand as they heat up.When air heats up and expands,its density also increases.The warmer,less dense air effectively floats on top of the colder, dense air below it. This creates a buoyant force that causes warmer air to rise.

cold air sinks because it is heavier as its more dense ( because of closely packed molecules) soits harder for them to move and they absorb less energy. Also, gravity pulls on it more strongly.

Hope it helps :)

8 0

3 years ago

Which atom, selenium (Se) or Arsenic (As), has the higher electron affinity and why?

IrinaVladis [17]

Answer:

5. Selenium, because it does not have a stable, half-filled p subshell and adding an electron does not decrease its stability.

Explanation:

Electron affinity is the amount of energy released when an isolated gaseous atom accepts electron to form the corresponding anion.

Selenium:-

The electronic configuration of the element is:-

$[Ar]3d^{10}4s^24p^4$

Arsenic:-

The electronic configuration of the element is:-

$[Ar]3d^{10}4s^24p^3$

The 4p orbital in case of arsenic is half filled which makes the element having more stability as compared to selenium.

Thus, selenium has higher electron affinity because adding electron does not decrease the stability as in case of arsenic.

8 0

3 years ago

Select the item(s) that are organs in either a plant or human

Nataly_w [17]

Plant: leaf tissue
Human: lungs

3 0

4 years ago