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natita [175]
2 years ago
9

Which of the following is used as a thermal insulator?

Chemistry
1 answer:
Advocard [28]2 years ago
7 0
B !! Reasoning on why: a thermal insulator is basically somthing helping to keep heat in.
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100.0 g of water was placed in a simple, constant-pressure calorimeter. The temperature of the water was recorded as 295.0 K. A
Marizza181 [45]

Answer:

296.05\ \text{K}

Explanation:

m_w = Mass of water = 100 g

c_w = Specific heat of water = 4.184\ \text{J/g K}

m_c = Mass of copper = 20 g

c_c = Specific heat of copper = 0.385\ \text{J/g K}

\Delta T_w = Temperature change in water = (T-295)

\Delta T_c = Temperature change in cooper = (353-T)

T = Final temperature of the system

The heat balance of the system is given by

m_wc_w\Delta T_w=m_cc_c\Delta T_c\\\Rightarrow 100\times 4.184\times (T-295)=20\times 0.385\times (353-T)\\\Rightarrow 418400\left(T-295\right)=7700\left(353-T\right)\\\Rightarrow 418400T-123428000=2718100-7700T\\\Rightarrow T=\frac{1261461}{4261}\\\Rightarrow T=296.05\ \text{K}

The final temperature of the water is 296.05\ \text{K}.

7 0
3 years ago
Answer all with detail please! Easy for those who have completed chemistry courses!
Zina [86]

a) CH2O

each element can be divided by 2

b) BCl3

the molecule is already in it's empirical formula

c) CH4

the molecule is already in it's empirical formula

d)CH2O

each element can be divided by 6

5 0
3 years ago
What instrument, along with a telescope, allows study of the wavelengths of visible light coming from a star?
LenKa [72]
The answer is D. a spectrograph
4 0
4 years ago
Read 2 more answers
PLEASE HELP!!!!!!!!!
KonstantinChe [14]

Answer:

Option "C" is the correct answer to the following question.

Explanation:

Given:

Pressure in an automobile tire (P) = 1.88 atm

Temperature (K) = 25°C = 273 + 25 = 298 Kelvin

New temperature (K1) = 37°C = 273 + 37 = 310 Kelvin

Find:

New pressure in an automobile tire (P1) = ?

Computation:

\frac{P}{K}= \frac{P1}{K1} \\\\\frac{1.88}{298}= \frac{P1}{310}\\\\1.9557

New pressure in an automobile tire (P1) = 1.9557

New pressure in an automobile tire (P1) = 1.96 (Approx)

5 0
3 years ago
At 570 mm hg and 25 c a gas sample has a volume of 2270 ml what is the final pressure at a volume of 1250 ml?
ValentinkaMS [17]

Main Answer:

Given data:

Initial Pressure P1 = 570 mm hg

Initial Volume V1 = 2270 ml

Final Pressure P2 = ? mm hg

Final Volume V1 = 1250 ml

According to the ideal gas equation,

PV = constant.

P1V1 = P2V2

P2 = P1V1/V2

P2 = (570 x 2270) / 1250

P2 = 1035.12 mm hg

The final pressure at volume of 1250 ml is 1035.12 mm hg.

Explanation:

What is ideal gas equation ?

The ideal gas equation is as follows:

PV = nRT

where P = Pressure

V = Volume

n = number of moles of gas

R = Universal gas constant

T = Temperature

This ideal gas equation provides the macroscopic particles behavior of the gas. At this condition, the particles of the gas, won't be attract or repel each other. It is consider as the stable condition.

To know more about ideal gas equation, please visit:

brainly.com/question/21912477

#SPJ4

3 0
2 years ago
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