Which physical property is used to identify matter based on solubility

20. I am a noble gas with 2 electrons.

madam [21]

Answer:

20.helium

21.silicon

hope this helps :)

8 0

3 years ago

The linear expansion coefficient of aluminium is 24 × 10^-6 (°C)^-1. When thetemperature is 33 °C, a spherical aluminium ball ha

KatRina [158]

A) Use the following formula for the linear expansion, in this case, of the diameter of the spherical ball:

$d=d_o\lbrack1+\alpha(T_2-T_1)\rbrack$

where,

do: initial diameter = 11.21cm

d: final diameter = ?

α: linear expansion coefficient = 24*10^6 /°C

T2: final temperature = 257°C

T1: intial temperature = 33°C

Replace the previous values of the parameters into the formula for d and simplify:

Hence, the diameter of the spherical ball is 11.27cm

B) First, consider what is the change in the radius of the sphere, as follow:

$\Delta V=0.0324V_o$

Now, use the following formula for the change in volume with the temperature:

$\Delta V=\beta V_o\Delta T=3\alpha V_o\Delta T$

where you have used the equivalence β = 3α.

Solve the equation above for the change in temperature and replace the values of the other parameters:

$\Delta T=\frac{\Delta V}{3\alpha V_o}=\frac{0.0324V_o}{3(24\cdot10^{-6}(\degree C)^{-1})V}=450\degree C$

Hence, the change in temperature is 450°C

6 0

1 year ago

An end of a light wire rod is bent into a hoop of radius r. The straight part of the rod has length l; a ball of mass M is attac

Roman55 [17]

Answer:

$arcsin(\frac{R\mu}{(R+l)\sqrt{\mu^2+1}})$

Explanation:

By the Law of Sines,

$sin \theta = \frac{sin \phi R}{ l + R}$

From Newton's Law,

$mg = N\sqrt{\mu^2+1}$

And the last equation again from Newton's Law,

$\mu N = mgsin\phi$

Then if we collect all equations together,

$\mu N = mgsin\phi = N\sqrt{\mu^2+1}sin\phi\\$

$sin\theta = \frac{\mu R}{ (l + R)\sqrt{\mu^2+1}}$

Thus,

$\theta = arcsin(\frac{R\mu}{(R+l)\sqrt{\mu^2+1}})$

8 0

3 years ago

Which is a sign of a chemical change? A) Ice cream left at room temperature melts. B) Calcium chloride is dissolved in H2O and d

Katarina [22]

Chemical change is any change that results in the formation of new chemical substances. (Thanks to google)

This the answer is D

5 0

3 years ago

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Which best describes the definition for the atomic mass of an element

Verizon [17]

Answer:

Atomic mass is the weighted average mass of an atom of an element based on the relative natural abundance of that element's isotopes. - Mass number: count of the total number of protons and neutrons in an atom's nucleus.

7 0

3 years ago

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