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3 years ago

How do crystalline solids differ from amorphous solids?

Physics

1 answer:

LUCKY_DIMON [66]3 years ago

6 0

Crystalline crystals have sharp, well-defined melting points. Amorphous Solids don't have melting points.

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A common practice in cooking is the addition of salt to boiling water (Kb = 0.52 °C kg/mole). One of the reasons for this might

lozanna [386]

Answer:

640.59 g of NaCl.

Explanation:

Using Boiling point elevation,

ΔTb = kb * i * b

Where,

b = molality

kb = 0.52 °C kg/mole

i = van't koff factor

ΔTb = ΔTsol - ΔTsolv

= 2°C

2 = 0.52 * b

= 3.846 mol/kg.

Mass of water, solvent = 2.85 kg

Molality is the ratio of the number of moles of the solute to the mass of the solvent.

= 3.846 * 2.85

= 10.96 mol.

Mass of NaCl = molar mass * number of moles

= 58.44 * 10.96

= 640.59 g of NaCl.

5 0

3 years ago

A car has negative acceleration. What information can you infer from this?

-BARSIC- [3]

The car is not moving,or either it is going backwords

7 0

3 years ago

Read 2 more answers

A Ferris wheel on a California pier is 27 m high and rotates once every 32 seconds in the counterclockwise direction. When the w

Leto [7]

A) 140 degrees

First of all, we need to find the angular velocity of the Ferris wheel. We know that its period is

T = 32 s

So the angular velocity is

$\omega=\frac{2\pi}{T}=\frac{2\pi}{32 s}=0.20 rad/s$

Assuming the wheel is moving at constant angular velocity, we can now calculate the angular displacement with respect to the initial position:

$\theta= \omega t$

and substituting t = 75 seconds, we find

$\theta= (0.20 rad/s)(75 s)=15 rad$

In degrees, it is

$15 rad: x = 2\pi rad : 360^{\circ}\\
x=\frac{(15 rad)(360^{\circ})}{2\pi}=860^{\circ} = 140^{\circ}$

So, the new position is 140 degrees from the initial position at the top.

B) 2.7 m/s

The tangential speed, v, of a point at the egde of the wheel is given by

$v=\omega r$

where we have

$\omega=0.20 rad/s$

r = d/2 = (27 m)/2=13.5 m is the radius of the wheel

Substituting into the equation, we find

$v=(0.20 rad/s)(13.5 m)=2.7 m/s$

6 0

3 years ago

How are electrical current measured

katrin2010 [14]

Answer:

ammeter

Explanation:

hope this helps

6 0

3 years ago

Why are airbags, helmets, and other safety devices important? Physics

Ivenika [448]

Answer:to prevent serious damage when an accident occur

Explanation:to prevent serious damage when accident occur

4 0

3 years ago