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3 years ago

Which of the following most likely happens during a physical change?

Chemistry

2 answers:

Paha777 [63]3 years ago

6 0

Answer:

B)Substance changes its form but not its molecular composition.

Explanation:

took the test

alexandr1967 [171]3 years ago

4 0

The correct answer is B.

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Aluminum reacts with sulfur gas to produce aluminum sulfide

weqwewe [10]

Answer:

What is the question? It looks like a fact.

Explanation:

4 0

3 years ago

The The thermal conductivity of a sheet of rigid, extruded insulation is reported to be k=0.029 W/ m measured temperature differ

vfiekz [6]

Answer:

Heat flux = 13.92 W/m2

Rate of heat transfer throug the 3m x 3m sheet = 125.28 W

The thermal resistance of the 3x3m sheet is 0.0958 K/W

Explanation:

The rate of heat transfer through a 3m x 3m sheet of insulation can be calculated as:

$q=-k*A*\frac{\Delta T}{\Delta X}\\\\q=-0.029\frac{W}{m*K}*(3m*3m)*\frac{12K}{0.025m} =125.28W$

The heat flux can be defined as the amount of heat flow by unit of area.

Using the previous calculation, we can estimate the heat flux:

$heat \, flux=\frac{q}{A}=\frac{125.28 W}{9 m^{2} } =13.92 W/m^{2}$

It can also be calculated as:

$q/A=-k*\frac{\Delta T}{\Delta X}$

The thermal resistance can be expressed as

$\Delta T=R_t*Q\\R_t=\Delta T/Q=\frac{\Delta X}{k*A}$

For the 3m x 3m sheet, the thermal resistance is

$R_t = \frac{\Delta X}{k*A}=\frac{0.025m}{0.029W/mK*9m^{2}}=0.0958 \, K/W$

4 0

3 years ago

Of the following: H2(g); He(g); CO2(g); which would behave least like an ideal gas? Why?

Margarita [4]

Answer:

CO2(g)

Because CO2 is the larges molecule with specific geometric, therefore it is not likely to behave as an ideal gas.

4 0

3 years ago

Calculate the solubility of cux(ksp=[cu2+][x2−]=1.27×10−36) in a solution that is 0.190 m in nacn.

nataly862011 [7]

if you have 1.27*10^-36= [Cu2+][X2-] then you can set both those values equal to x because they're stoichimetrically equal.

1.27*10^-36=x^2

Take the square root of both sides.

1.13*10^-18=x

That would be your solubility.

8 0

3 years ago

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Draw the repeat unit of the copolymer used for artificial skin growth, which is formed by condensation polymerization of lactic

elena55 [62]

Answer is in Word document below (x - number of units of lactic acid,
y - number of units of glycolic acid).
PLGA is a copolymer of poly lactic acid (PLA) and poly glycolic acid (PGA). It is biocompatible and biodegradable copolymer.

Download docx

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3 years ago

Read 2 more answers