luminous objects such as flashlights emit light that we can see. how do we see an object that isnt luminous?

1 answer:

5 0

<span>In order for us to see an object that is non-luminous, it must reflect some of the light it receives from a luminous source, such as the Sun. Most of the objects we see, such as cars, clouds or even the Moon, are not luminous; it is just that they reflect sunlight</span>

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I have a 5 liter container of oxygen (O 2 ) gas at 2.0 atm and 25 0 C, what mass of gas is inside this

Thepotemich [5.8K]

Answer:

$m=13.1gO_2$

Explanation:

Hello,

In this case, by using the ideal gas equation, we first compute the moles of oxygen at the given volume, pressure and temperature:

$PV=nRT\\\\n=\frac{PV}{RT}=\frac{2.0atm*5L}{0.082\frac{atm*L}{mol*K}(25+273.15)K} =0.41mol$

Then, since molar mass of gaseous oxygen is 32 g/mol, we compute the contained mass in grams as shown below:

$m=0.41mol*\frac{32g}{1mol}\\\\m=13.1gO_2$

Best regards.

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lutik1710 [3]

I think the correct answer from the choices listed above is option B. When a substance changes from one phase to another, the average kinetic energy of the substance <span>changes since the molecules movements are changed as well. Hope this answers the question. Have a nice day.</span>

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Label each molecule with the name of its shape. click on the 3d models to rotate the molecules.

SIZIF [17.4K]

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Why do scientists repeat the experiment that lead to a scientific theory

Genrish500 [490]

Explanation:

Having a large sample size in the experiment: This helps to account for any small differences among the test subjects that may provide unexpected results. Repeating experimental trials multiple times: Errors may result from slight differences in test subjects, or mistakes in methodology or data collection...

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In crystal of an ionic compound, the cations are surrounded by anions so that the charges of the ions are balanced true or false

grandymaker [24]

True

Explanation:

In the crystal of an ionic compound, the cations are surrounded by anions so that the charges of the ions are balanced. This very correct.

Ionic compounds are electrically neutral and forms by a charge balance.

To form an ionic crystal, the charges overall must be balanced and the compound must remain electrically neutral.
Equal number of charges on the metal and non-metal must cancel out to establish an electrostatic force.

learn more:

Ionic compound brainly.com/question/6071838

#learnwithBrainly

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