What evidence leads us to believe that energy levels in the hydrogen atom are quantities?

Answers

Answer 1

Answer:

Answer:

Because only certain photons are emitted, we know that only certain energy changes are occurring. This means that the hydrogen atom must have certain discrete energy levels. Excited hydrogen atoms always emit photons with the same discrete colors (wavelengths). They never emit photons with energies between those shown. So we concluded, all hydrogen atoms have the same set of discrete energy levels.

Explanation:

unit 4 test (i have all the answers if you want me to send the link i can)

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If a cell is like a city, then city hall, or the control center, would be the cell's ___________.

Answers

Answer: Nucleus. the nucleus has control over the whole cell.

Answer: Nucleus

Explanation:

The cell’s nucleus is what controls all of the cell’s functions, therefore similar to how a city hall controls a city’s functions.

When silver coins are found in ancient shipwrecks,they are coated with a black crust. What question could you ask to help you decide whether the silver underwent a chemical change or a physical change? Explain.

Answers

It went under a physical change because it (1) changed color. (2) changed form.

Final answer:

To understand if the black crust on the silver coins signifies a chemical or physical change, you should determine if the substance's identity is altered. This is because a chemical change transforms the substance into a new material, while a physical change only alters its form. Knowing whether the crust changes the original silver coin's nature can differentiate between the two.

Explanation:

To discern whether the black crust on the silver coins signifies a chemical change or a physical change, you could ask: 'Can the black crust be removed to reveal the original silver coin beneath, without altering the silver coin's composition?'

This question is crucial because the main difference between chemical and physical changes on whether the substance's identity is altered. In a chemical change, substances are transformed into entirely new materials with different properties. An example of this is iron rusting. On the contrary, a physical change, such as ice melting into water, does not change the substance's fundamental nature, only its form.

If the black crust on the silver coins is a result of oxidation (combines with oxygen), similar to that in a rusting process, this would indicate a chemical change. However, if the black crust is merely tarnishing that can be polished off to reveal the same silver beneath, this would be an example of a physical change. Thus, understanding whether the crust alters the fundamental nature of the silver is important to differentiate between a chemical change and a physical change.

Learn more about Chemical and Physical Changes here:

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Calculate the mass in grams of 5.0 moles of Li

Answers

5.0 mols Li × 6.94 g Li/ 1 mol Li = 34.7 grams of Li

sig figs: 35 grams of Li

If a certain gas occupies a volume of 10 L when the applied pressure is 5.0 atm , find the pressure when the gas occupies a volume of 2.5 L .

Answers

We assume the change in volume occurs at constant temperature and so we use the Boyle's law formula $P_1V_1=P_2V_2$ .

We are given the initial volume and pressure as well as as final volume, the question wants the final pressure $P_2$

So we make $P_2$ the subject of the formula

$P_2= (P_1 V_1)/(V_2) = (5*10)/(2.5)= 20 atm$

Which of the following is a solution: pure water, fruit punch, cereal and milk in a bowl? Explain how you know.

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Hi. Fruit Punch is a solution and i know this because in a Fruit Punch, you have to mix water, the fruit juice, sugar and many other substances. In pure water it is just water. In cereal and milk, those are two different foods, not a combined one, like Fruit punch. Hope that was not too confusing! ;)

Fruit punch is because it blends together evenly and cereal and milk in a bowl you can't mix together you could easily take the cereal out and for the fruit punch you cant

List the number of atoms for each element in this compound: CaCO 3

Answers

calcium: 1
carbon: 1
oxygen: 3

YEP THAT THGE ASNWER 1,1,3

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