All categories

3 years ago

Why do gases condense when they are cooled

1 answer:

7 0

Because the molecules slow down and get closer together in the space that they are in. Once they get to freezing point, the molecules almost stop moving altogether.<span />

You might be interested in

Calculate the number of atoms contained in a cylinder (1 m radiusand1 m deep)of (a) magnesium (b) lead.

Jobisdone [24]

Answer:

The question is incomplete,below is the complete question

"Calculate the number of atoms contained in a cylinder (1μm radius and 1μm deep)of (a) magnesium (b) lead."

Answer:

a. 1.35*10^{11} atoms

b. 1.03*10^{11} atoms

Explanation:

First, we determine the volume of the magnesium in the cylinder container

using the volume of a cylinder

$V=\pi r^{2}h\\ r=10^{-6}m\\ h=10^{-6}m\\V=\pi *10^{-6*2}*10^{-6}\\V=\pi *10^{-18}\\V=3.14*10^{-18}m^{3}\\$

a. Next we determine the mass of the magnesium ,

using the density=mass/volume

since density of a magnesium

$the density of magnesium =1.738*10^{3}kg/m^{3} \\mass=density * volume \\mass=1.738*10^{3}*3.14*10^{-18}\\mass=5.46*10^{-15}kg\\ \\mass=5.46*10^{-12}g\\$

Finally to calculate the number of atoms,

we determine the number of moles

mole=mass/molarmass

$mole=5.46*10^{-12}/ 24.305\\mole=0.225*10^{-12}mol\\$

Hence the number of atoms is

number of atoms=mole*Avogadro's constant

$number of atoms = 0.225*10^{-12}*6.02*10^{23}\\number of atoms =1.35*10^{11} atoms$

b. for he lead, we determine the mass of the lead ,

using the density=mass/volume

since density of a magnesium

$the density of lead =11.34*10^{3}kg/m^{3} \\mass=density * volume \\mass=11.34*10^{3}*3.14*10^{-18}\\mass=35.60*10^{-15}kg\\ \\mass=35.60*10^{-12}g\\$

Finally to calculate the number of atoms,

we determine the number of moles

mole=mass/molarmass

$mole=35.60*10^{-12}/ 207.2\\mole=0.1718*10^{-12}mol\\$

Hence the number of atoms is

number of atoms=mole*Avogadro's constant

$number of atoms = 0.1718*10^{-12}*6.02*10^{23}\\number of atoms =1.03*10^{11} atoms$

3 0

2 years ago

An object is moving at a velocity of 14 m/s. It accelerates to a velocity of 48 m/s over a time

Tju [1.3M]

Answer:

Explanation:

5 0

2 years ago

Draw the graph of the cooling curve of Naphtalene; hence discuss the cooling curve of Nephtalene

ioda

Answer:

soory but i cant under stand it proper can explain

5 0

3 years ago

Read 2 more answers

Jason launches a model rocket with a mass of 2.0 kg from his spring-powered rocket launcher with a spring constant of 800 N/m. H

Arada [10]

Answer:

121 Joules

6.16717 m

Explanation:

m = Mass of the rocket = 2 kg

k = Spring constant = 800 N/m

x = Compression of spring = 0.55 m

Here, the kinetic energy of the spring and rocket will balance each other

$\frac{1}{2}mu^2=\frac{1}{2}kx^2\\\Rightarrow u=\sqrt{\frac{kx^2}{m}}\\\Rightarrow u=\sqrt{\frac{800\times 0.55^2}{2}}\\\Rightarrow u=11\ m/s$

The initial velocity of the rocket is 11 m/s = u.

v = Final velocity

s = Displacement

a = Acceleration due to gravity = 9.81 m/s² = g

$v^2-u^2=2as\\\Rightarrow s=\frac{v^2-u^2}{2a}\\\Rightarrow s=\frac{0^2-11^2}{2\times -9.81}\\\Rightarrow s=6.16717\ m$

The maximum height of the rocket will be 6.16717 m

Potential energy is given by

$P=mgh\\\Rightarrow P=2\times 9.81\times \frac{0^2-11^2}{2\times -9.81}\\\Rightarrow P=121\ J$

The potential energy of the rocket at the maximum height will be 121 Joules

5 0

3 years ago

Solids,liquids,and gases are three forms of matter that?

lora16 [44]

There are 3

Matter can exist in one of three main states: solid, liquid, or gas.
Solid matter is composed of tightly packed particles. ...
Liquid matter is made of more loosely packed particles. ...
Gaseous matter is composed of particles packed so loosely that it has neither a defined shape nor a defined volume.

8 0

3 years ago

Read 2 more answers