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3 years ago

What is the specific heat, thermal conductivity, density of polyurethane foam?

1 answer:

4 0

Insulation materials with higher thicknesses have lower long-term thermal conductivity values in general. The density of rigid polyurethane foam (PUR/PIR) used for building thermal insulation typically ranges from 30 to 45 kg/m3. For some applications, however, it can achieve 100 kg/m3.

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366 Cal to kilowatt-hours, how to convert?

aniked [119]

Answer:

0.000425 kilowatt hour

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3 years ago

Are cells reproduced sexually

Vanyuwa [196]

I think that cells are reproduced sexually because i dont think there's another option. Right?

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4 years ago

Read 2 more answers

A 80.0 g piece of metal at 88.0°C is placed in 125 g of water at 20.0°C contained in a calorimeter. The metal and water come to

grandymaker [24]

Answer:

The specific heat of the metal is 0.485 J/g°C

Explanation:

<u>Step 1:</u> Data given

Mass of the piece of metal = 80.0 grams

Mass of the water = 125 grams

Initial temperature of the metal = 88.0 °C

Initial temperature of water =20.0 °C

Final temperature = 24.7 °C

pecific heat of water is 4.18 J/g*°C

<u>Step 2:</u> Calculate specific heat of the metal

Qgained = -Qlost

Q =m*c*ΔT

Qwater = - Qmetal

m(water)*c(water)*ΔT(water) = -m(metal)*c(metal)*ΔT(metal)

with mass of water = 125 grams

with c( water) = 4.18 J/g°C

with ΔT(water) = T2-T1 = 24.7 - 20 = 4.7°C

with mass of metal = 80.0 grams

with c(metal) = TO BE DETERMINED

with ΔT(metal) = 24.7 - 88.0 = -63.3 °C

125*4.18*4.7 = -80 * C(metal) * -63.3

2455.75 = -80 * C(metal) * -63.3

C(metal) = 2455.75 / (-80*-63.3)

C(metal) = 0.485 J/g°C

The specific heat of the metal is 0.485 J/g°C

3 0

4 years ago

Describe the process used to measure out a specific mass of a solid

raketka [301]

Place the solid on an electronic balance. Read the balance reading.

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4 years ago

A 8.5-liter sample of a gas has 1.2 mole of the gas. if 0.65 mole of the gas is added, what is the final volume of the gas? temp

stira [4]

13 liters is the correct answer

13 liters is the final volume of the gas when the temperature and pressure remain constant.

v1/n1 = v2/n2

where,

v1 = initial volume = 8.5 liter

n1= initial mole of gas = 1.2 mole

n2= final mole of gas = 1.2+0.65= 1.85 mole

v2= final volume = ?

8.5 L/1.2 mol = v2/1.85 mol

7 L x 1.85 mol = v2/1.85 mol x 1.85 mol

13 L = v2

v2= 13 liter

A mole is an SI unit used to measure significant numbers of subatomic particles, such as atoms, molecules, or smaller particles.
Any substance has an Avogadro number of molecules in a mole.
The value of the Avogadro number is 6.02214076 × $10^{23}$ .

22.4 L

At STP (Standard Temperature and Pressure = 0 °C, 1 atm), an ideal gas has a volume of 22.41 L/mol.

<h3>What makes something a mole?</h3>

Chemists use the term "mole" because atoms, molecules, and other particles are all very small and require a large amount to even weigh them.
A mole is a measurement of the number of particles present, not their mass.

To learn more about mole of gas visit:

brainly.com/question/1400967

#SPJ4

4 0

2 years ago