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ludmilkaskok [199]
3 years ago
9

Mention three sources of light​

Chemistry
1 answer:
Kitty [74]3 years ago
7 0

Answer:

Hey

You.

You emit infered light via heat.

The sun

The sun emits <em><u>all</u></em> frequincies of light, but mostly yellow light.

Your microwwaves

As your food gets hotter the microwwaves shake up the water molecules because they are the perfect frequincy to do so.

Wbob1314

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Who were the scientists who won the nobel prize for the atomic model?
AleksAgata [21]

Answer:

Here's what I find.  

Explanation:

Many scientists contributed to our model of the atom.

Among those who received the Nobel Prize for their work are:

1906 — J.J. Thomson        — discovery of the electron

1908 — Ernest Rutherford — nuclear model of the atom

1922 — Niels Bohr             — planetary model of the atom

1922 — Albert Einstein      — quantum mechanical model of the atom

1935 — James Chadwick  — discovery of the neutron

4 0
3 years ago
1. A student has a petri dish packed with a layer of marbles. Which of the following activities should the student perform to de
Sindrei [870]

Answer: A.) Removing a few marbles from the petri dish and stirring the rest around as energy is added

B) The high temperature makes the gas molecules spread apart according to Charles's law because this law describes how a gas will behave at constant pressure.

Explanation: The phase transition from solid to liquid involves the use of energy to make the molecules present in solid to break the inter molecular forces and to start moving away from each other as in liquid. The molecules in solid are closely packed whereas in liquids they are loosely packed. Thus less number of molecules are present per unit volume in a liquid. Thus the marbles have to be removed to show less density and the energy has to supplied. Removing all but two marbles from the petri dish and shaking them vigorously as energy is added will give us a more disorderd state called gas in which the molecules are very far apart and the density is least.

B) According to Boyle's law the pressure is inversely proportional to the volume of the gas at constant temperature and constant number of moles. P\propto \frac{1}{V}     (At constant temperature and number of moles)

According to Charle's law the volume is directly proportional to the temperature of the gas at constant pressure and constant number of moles.

V\propto T    (At constant pressure and number of moles)

Thus as temperature of the gas increases , the volume also increases, and the density decreases. the gas becomes lighter and thus rises up.

7 0
2 years ago
A person accidentally swallows a drop of liquid oxygen, O2(l), which has a density of 1.149 g/mL. Assuming the drop has a volume
nasty-shy [4]

Answer:

First, let's determine how many moles of oxygen we have.

Atomic weight oxygen = 15.999

Molar mass O2 = 2*15.999 = 31.998 g/mol

We have 3 drops at 0.050 ml each for a total volume of 3*0.050ml = 0.150 ml

Since the density is 1.149 g/mol,

we have 1.149 g/ml * 0.150 ml = 0.17235 g of O2

Divide the number of grams by the molar mass to get the number of moles 0.17235 g / 31.998 g/mol = 0.005386274 mol

Now we can use the ideal gas law. The equation PV = nRT where P = pressure (1.0 atm) V = volume n = number of moles (0.005386274 mol) R = ideal gas constant (0.082057338 L*atm/(K*mol) ) T = Absolute temperature ( 30 + 273.15 = 303.15 K)

Now take the formula and solve for V, then substitute the known values and solve.

PV = nRT V = nRT/P V = 0.005386274 mol * 0.082057338 L*atm/(K*mol) * 303.15 K / 1.0 atm V = 0.000441983 L*atm/(K*) * 303.15 K / 1.0 atm V = 0.133987239 L*atm / 1.0 atm V = 0.133987239 L

So the volume (rounded to 3 significant figures) will be 134 ml.

8 0
3 years ago
Read 2 more answers
Which statement about gases is true?
Whitepunk [10]

Answer:

they are made up of hard spheres that are in random motion

7 0
2 years ago
Read 2 more answers
What does literal mean in science please hurry it's due at 11:40!!
Leokris [45]

Answer:

In computer science, a literal is a notation for representing a fixed value in source code.  An anonymous function is a literal for the function type. In contrast to literals, variables or constants are symbols that can take on one of a class of fixed values, the constant being constrained not to change.

Explanation:

4 0
2 years ago
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