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
Vadim26 [7]
3 years ago
12

What is the energy efficiency of a light bulb that gives you 30 units of usable energy for every 100 units of energy put in to i

t?
a. 0.3
b. 3
c. 30
Chemistry
2 answers:
NeX [460]3 years ago
7 0

Answer:

Explanation:

Given parameters:

Energy output = 30units

Energy input = 100units

problem:

Energy efficiency of light bulb:

Solution:

 Efficiency is given as:

    Efficieny = \frac{energy_{output} }{energy_{input } x100

   Efficieny = \frac{30}{100} x 100 = 30%

 

vladimir2022 [97]3 years ago
6 0

Answer:

The correct answer is option a.

Explanation:

Efficiency is defined as the ratio of output energy to input energy.

Efficiency(e)=\frac{E_o}{E_i}

Energy given out by the system = E_o

Energy given to the system = E_i

Here we are given with : E_o-30 units,E_i=100

Efficiency of of a light bulb:

e=\frac{30 units}{100 units}=0.3

You might be interested in
Write the balanced molecular equation for the reaction of barium hydroxide with perchloric acid. What is the coefficient of H2O?
djyliett [7]

Answer:

The reaction of perchloric acid and barium hydroxide yields to barium perchlorate (Ba(ClO4)2) and water (H2O). The resulting balanced equation is 2 HClO4 + Ba(OH)2 = Ba(ClO4)2 +2 H2O. This means, for every mole of barium perchlorate produced, 2 moles of perchloric acid and barium hydroxide are required.

Explanation:

7 0
3 years ago
Read 2 more answers
Don't answer if you're not 100%.
Ilia_Sergeevich [38]
<span>Answer: has only one identity

Compounds like water (H2O) has 2 kinds of atoms which are hydrogen and oxygen. They also have a chemical bond and their bond is not able to be separated by physical means. It different with a mixture of water with sugar. The water and sugar are two different molecules but they don't bind each other. If you evaporate the water, the sugar will remains so it </span>can be separated by physical means.<span>.</span>
3 0
3 years ago
What is the volume of 2.00 moles of ideal gas at 25'c and 121.59 kpa of pressure
katrin [286]

Answer:

40.73 L.

Explanation:

  • We can use the general law of ideal gas: <em>PV = nRT.</em>

where, P is the pressure of the gas in atm (P = 121.59 kPa/101.325 = 1.2 atm).

V is the volume of the gas in L (V = ??? L).

n is the no. of moles of the gas in mol (n = 2.0 mol).

R  is the general gas constant (R = 0.082 L.atm/mol.K),

T is the temperature of the gas in K (T = 25°C + 273 = 298 K).

<em>∴ V = nRT/P</em> = (2.0 mol)(0.082 L.atm/mol.K)(298 K)/(1.2 atm) = <em>40.73 L.</em>

6 0
3 years ago
The method by which the substances in a mixture are separated is called what?
yanalaym [24]

Answer:

Filtration is a separation method used to separate out pure substances in mixtures comprised of particles some of which are large enough in size to be captured with a porous material.

8 0
3 years ago
Why isn’t there anyone helping for chemistry I need this by literally tomorrow morning before 8:30 ;-;
Naily [24]

Answer:

Find it in the teacher desk by tomorrow 7:30

Explanation:

4 0
2 years ago
Read 2 more answers
Other questions:
  • An air temperature of 95°C most often exists in which layer of the atmosphere?
    9·1 answer
  • How does the density or aluminum compare to the density of gold
    14·1 answer
  • Compare a solvent and a solute?
    8·1 answer
  • Why is mendeleevâs periodic table considered a viable scientific model?
    7·1 answer
  • How are lactic and alcoholic fermentation similar?
    13·1 answer
  • 2. 7.5 g of potassium react with water to produce potassium hydroxide and hydrogen gas. Calculate the mass of potassium hydroxid
    11·1 answer
  • A 63.5 g sample of an unidentified metal absorbs 355 ) of heat when its temperature changes
    6·1 answer
  • What type of shape do solids have?
    7·1 answer
  • Define the terms Genotype and Phenotype.
    11·2 answers
  • What is the volume of a piece of metal that has a density of 6.68g.cm^3 and has a mass of 1975 g?
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!