1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
den301095 [7]
3 years ago
7

How much electric energy does a 40 W light bulb use if it is left on for 12 hours?

Chemistry
1 answer:
OlgaM077 [116]3 years ago
3 0
480 hrs of electricity
You might be interested in
Can someone help me on this please ?
lesya [120]
If it’s 22.5 millimeters, it’s gonna be 22,500 micrometers. The answer is C
6 0
3 years ago
PLZ HELP WILL MARK BRAINLIEST I NEED INSTANT HELP THIS IS A MAJOR GRADE I THINK I KNOW THE ANSWER BUT NOT SURE IF IT'S RIGHT. PL
JulsSmile [24]
Asexual is growth and repair , 4 daughter cells and cell divides once dna replicates and the rest is sexual reproduction besides divides one
3 0
3 years ago
Explains how commercial land use negatively impacts watersheds?
Juli2301 [7.4K]
Polluted water. The growing crops and climate variability change. Basically the farming
3 0
3 years ago
An unknown piece of metal weighing 95.0 g is heated to 98.0°C. It is dropped into 250.0 g of water at 23.0°C. When equilibrium i
lutik1710 [3]

Answer:

C_{metal}=126.6\frac{J}{g\°C}

Explanation:

Hello!

In this case, when two substances at different temperature are put in contact and an equilibrium temperature is attained, we can evidence that the heat lost by the hot substance (metal) is gained by the cold substance (water) and we can write:

Q_{metal}=-Q_{water}

Which can be also written as:

m_{metal}C_{metal}(T_{EQ}-T_{metal})=-m_{water}C_{water}(T_{EQ}-T_{water})

Thus, since we need the specific heat of the metal, we solve for it as shown below:

C_{metal}=\frac{m_{water}C_{water}(T_{EQ}-T_{water})}{-m_{metal}(T_{EQ}-T_{metal})} \\\\C_{metal}=\frac{250.0g*4.184\frac{J}{g\°C}(29.0\°C-98.0\°C)}{95.0g(29.0\°C-23.0\°C)} \\\\C_{metal}=126.6\frac{J}{g\°C}

Best regards.

7 0
2 years ago
A gas within a piston–cylinder assembly undergoes an isothermal process at 400 K during which the change in entropy is −0.3 kJ/K
Karolina [17]

Answer:

W = -120 KJ

Explanation:

Since the piston–cylinder assembly undergoes an isothermal process, then the temperature is constant.

Thus; T1 = T2 = 400K

change in entropy; ΔS = −0.3 kJ/K

Formula for change in entropy is written as;

ΔS = Q/T

Where Q is amount of heat transferred.

Thus;

Q = ΔS × T

Q = -0.3 × 400

Q = -120 KJ

From the first law of thermodynamics, we can find the workdone from;

Q = ΔU + W

Where;

ΔU is Change in the internal energy

W = Work done

Now, since it's an ideal gas model, the change in internal energy is expressed as;

ΔU = m•C_v•ΔT

Where;

m is mass

C_v is heat capacity at constant volume

ΔT is change in temperature

Now, since it's an isothermal process where temperature is constant, then;

ΔT = T2 - T1 = 0

Thus;

ΔU = m•C_v•ΔT = 0

ΔU = 0

From earlier;

Q = ΔU + W

Thus;

-120 = 0+ W

W = -120 KJ

8 0
3 years ago
Other questions:
  • Help me !!!!!!!!!!! Please
    6·1 answer
  • . Ana has two mixtures. Mixture 1: marble and salt. Mixture 2: Salt and pepper She predicts she can easily separate the ingredie
    5·1 answer
  • Write the elections notation for bromine​
    10·1 answer
  • Which element is likely more reactive, and why
    9·1 answer
  • Which of the following correctly identifies a bryophyte
    6·1 answer
  • 4. When cerium sufate, Ce(SO4)3, is dissolved in water, energy is:?
    7·1 answer
  • Momentum is mass times<br><br> A. acceleration<br> B. velocity<br> C. distance
    11·1 answer
  • A motorcycle is moving at a constant speed of 35 km/h. How long (in hours) does it take the motorcycle to travel a distance of 6
    10·2 answers
  • What is the formula for the compound iodine trichoride?
    5·1 answer
  • A calorimeter contains 72.0 g of water at 19.2 oC. A 141 g piece of metal is heated to 89.0 oC and dropped into the water. The e
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!