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1 year ago

Which of the following best describes how a compound naturally occurs?

Chemistry

2 answers:

FrozenT [24]1 year ago

7 0

I think C but I could be wrong.

xxMikexx [17]1 year ago

6 0

Answer:the molecular formula

Explanation:

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The modern view of an electron orbital in an atom can best be described as

Roman55 [17]

Answer:

An orbital is a region in space where there is a high probability of finding an electron.

Explanation:

The orbital is a concept that developed in quantum mechanics. Recall that Neils Bohr postulated that the electron occupied stationary states which he called energy levels. Electrons emit radiation when the move from a higher to a lower energy level. Similarly, energy is absorbed by an electron to move from a lower to a higher orbit.

This idea was upturned by the Heisenberg uncertainty principle. This principle state that the momentum and position of a particle can not be simultaneously measured with precision.

Instead of defining a 'fixed position' for the electron, we define a region in space where there is a possibility of finding an electron with a certain amount of energy. This orbital is identified by a set of quantum numbers.

7 0

2 years ago

When a 11.9 gram sample of copper metal is dropped into a glass of cold water, the temperature of the copper drops from 55°C to

Ugo [173]

Answer:

I need this one asap

Explanation:

Please

8 0

2 years ago

Solid lead(ii) iodide was prepared by reacting 65.0 ml of a solution containing 0.218 m lead(ii) ions with 80.0 ml of a solution

lutik1710 [3]

The balanced chemical reaction will be as follows:

$Pb^{2+}+2I^{-}\rightarrow PbI_{2}$

To determine the % yield, first calculate the theoretical yield.

Molairty and volume of $Pb^{2+}$ is 0.218 M and 65 mL respectively. Convert it into number of moles as follows:

$n=M\times V$

Here, volume should be in L thus,

$n=0.218 M\times 65\times 10^{-3}L=0.01417 mol$

Similarly, calculate number of moles of iodide ion,

$n=0.265 M\times 80\times 10^{-3}L=0.0212 mol$

Now, from the balanced chemical equation, 1 mole of $Pb^{2+}$ gives 1 mol of $PbI_{2}$ , thus, 0.01417 mol will give 0.01417 mol of $PbI_{2}$ .

Also, 2 mole of $I^{-}$ will give 1 mole of $PbI_{2}$ thus, 0.0212 mol will give,

$n=0.0212 mol\times \frac{1}{2}=0.0106 mol$

Molar mass of $PbI_{2}$ is 461.01 g/mol calculating mass of $PbI_{2}$ obtained from $Pb^{2+}$ and $I^{-}$ as follows:

From $Pb^{2+}$ :

$m=n\times M=0.01417 mol\times 461.01 g/mol=6.5325 g$

Similarly, for $I^{-}$ :

$m=n\times M=0.0106 mol\times 461.01 g/mol=4.8867 g$

Here, $I^{-}$ is limiting reactant as it produced less amount of $PbI_{2}$ as compared with $Pb^{2+}$ .

Theoretical yield is amount of product obtained from limiting reactant thus, theoretical yield will be 4.8867 g.

Percentage yield can be calculated as follows:

$Percentage yield=\frac{Actual yeild}{theoretical yield}\times 100$

Actual yield is 3.26 g thus, percentage yield will be:

$Percentage yield=\frac{3.26}{4.8867}\times 100$ =66.7%

Therefore, % yield will be 66.7%

7 0

2 years ago

Which of the following processes has an increase in entropy?

Airida [17]

Entropy is defined as "randomness," so having that in mind, the process which has an increase in entropy is A. boiling a pot of water because when you boil water, the molecules space out and become gas.

7 0

2 years ago

Read 2 more answers

Anna is conducting an experiment how rather affects cell phone reception. Which of the following is the best answer

docker41 [41]

Answer:

You did not provide any details about the experiment, nor provided any answers for us from which to choose "the best answer" from. Please refine your question next time.

Explanation:

7 0

2 years ago