All categories

3 years ago

The average distance between molecules always increases during which of the following phase changes?

Chemistry

1 answer:

vodomira [7]3 years ago

4 0

Answer:

B. liquid to gas

Explanation:

Matter exists in 3 different states:

- Solid: in solids, particles in the substance are tightly bond to each other through strong intermolecular forces. Therefore, they can only vibrate around their fixed position, but they cannot move freely: as a result, the distance between the particles is the smallest among the 3 states of matter.

- Liquid: in a liquid, particles are able to slide past each other, however there are still intermolecular forces keeping them not too far from each other. As a result, in liquids, particles are on average more distance from each other compared to solids.

- Gas: in a gas, particles are completely free to move, as the intermolecular forces between them are negligible. As a result, in gases, the distance between molecules is the greatest, compared with solids and liquids.

Therefore, the phase changes in which the average distance between molecules increases is:

B. liquid to gas

You might be interested in

If the pressure of 125 cm3 of nitrogen gas at 100 °c decreases from 885 torr to 225torr, what is the final volume? assume temper

navik [9.2K]

Suppose the Gas is acting ideally, Then, According to Ideal Gas Equation;

P₁ V₁ = P₂ V₂ ----- (1)
Data Given:
P₁ = 885 torr

V₁ = 125 cm³

P₂ = 225 torr

V₂ = ?

Puting values in eq, 1;

V₂ = P₁ V₁ / P₂

V₂ = (885 torr × 125 cm³) ÷ 225 torr

V₂ = 491.66 cm³

4 0

3 years ago

The hardest known mineral is _____. topaz talc diamond graphite

klemol [59]

Diamond. It can only be cut with another diamond.

8 0

3 years ago

Read 2 more answers

A chemist wishing to do an experiment requiring 47-Ca2+ (half-life = 4.5 days) needs 5.0 μg of the nuclide. What mass of 47-CaCO

NARA [144]

Answer:

5.8μg

Explanation:

According to the rate or decay law:

N/N₀ = exp(-λt)------------------------------- (1)

Where N = Current quantity, μg

N₀ = Original quantity, μg

λ= Decay constant day⁻¹

t = time in days

Since the half life is 4.5 days, we can calculate the λ from (1) by substituting N/N₀ = 0.5

0.5 = exp (-4.5λ)

ln 0.5 = -4.5λ

-0.6931 = -4.5λ

λ = -0.6931 /-4.5

=0.1540 day⁻¹

Substituting into (1) we have :

N/N₀ = exp(-0.154t)----------------------------- (2)

To receive 5.0 μg of the nuclide with a delivery time of 24 hours or 1 day:

N = 5.0 μg

N₀ = Unknown

t = 1 day

Substituting into (2) we have

[5/N₀] = exp (-0.154 x 1)

5/N₀ = 0.8572

N₀ = 5/0.8572

= 5.8329μg

≈ 5.8μg

The Chemist must order 5.8μg of 47-CaCO3

6 0

3 years ago

A student used 1.168g of an unknown weak acid and titrated it against 28.75 mL of 0.105M NaOH to reach the equivalence point. Wh

Vaselesa [24]

Answer:

The molar mass of the unknown acid is 386.8 g/mol

Explanation:

Step 1: Data given

Mass of the weak acid = 1.168 grams

volume of NaOH = 28.75 mL = 0.02875 L

Molarity of NaOH = 0.105 M

Since we only know 1 equivalence point, we suppose the acid is monoprotic

Step 2: Calculate moles NaOH

Moles NaOH = molarity NaOH * volume NaOH

Moles NaOH = 0.105 M * 0.02875 L

Moles NaOH = 0.00302 moles

We need 0.00302 moles of weak acid to neutralize the NaOH

Step 3: Calculate molar mass of weak acid

Molar mass = mass / moles

Molar mass = 1.168 grams / 0.00302 moles

Molar mass = 386.8 g/mol

The molar mass of the unknown acid is 386.8 g/mol

3 0

3 years ago

What is the partial pressure of C?<br> atm C

s344n2d4d5 [400]

The partial pressure of carbon is 45 mm Hg.

Explanation:

The partial pressure of carbon dioxide is referred as the amount of carbon dioxide present in venous or arterial blood. It acts as a ventilation in the lungs.
There is a formula for measuring partial pressure . As we know total pressure means summation of the pressure of all the gases included .
To find partial pressure we need- total pressure* fraction of mole of that gas. The partial pressure of CO2 is more because it carries deoxygenated blood from the whole body towards the lungs.

8 0

3 years ago