CHEMISTRY HIGH SCHOOL

What did Bohr’s model of the atom include that Rutherford’s model did not have?

Answers

Answer 1

Answer:

What did Bohr’s model of the atom include that Rutherford’s model did not have?

The answer is energy levels

Answer 2

Answer: I think it's orbitals.
I'm pretty sure...

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If the acetylene tank contains 37.0 mol of C2H2 and the oxygen tank contains 81.0 mol of O2, what is the limiting reactant for this reaction?

Answers

Answer: $O_2$ is considered as the limiting reagent for this reaction.

Explanation:

Limiting reagent is the reagent which limits the formation of the product.

Excess reagent is the reagent which is present in excess in a chemical reaction.

For the combustion of acetylene, the reaction follows:

$2C_2H_2(g)+5O_2(g)\rightarrow 4CO_2+2H_2O$

By Stoichiometry,

5 moles of oxygen gas reacts with 2 moles of acetylene.

So, 81 moles of oxygen gas will react with = $(2)/(5)* 81$ = 32.4 moles of acetylene.

As, the required amount of acetylene is less than the given amount. So, it is considered as an excess reagent and oxygen gas is the limiting reagent.

Answer:

Oxygen is the limiting reactant of this reaction.

Explanation:

$2C_2H_2+5O_2\rightarrow 4CO_2+2H_2O$

2 moles of acetylene reacts with 5 moles of oxygen.

Then 37 moles of acetylene will react with :

$(5)/(2)* 37.0 mol=92.5 moles$ of oxygen gas.

But only 81 moles of oxygen gas is present.

Then 81.0 moles of oxygen gas will react with:

$(2)/(5)* 81.0 mol=32.4 moles$ of acetylene.

And still acetylene will remain after.

So, from the above calculation we cans see that oxygen is present in limiting amount which will limit the reaction.Hence, the limiting reactant of this reaction is oxygen.

The unstable arrangement of atoms that forms momentarily at the peak of the activation-energy barrier is known as the what?

Answers

The unstable arrangement of atoms that forms at the peak of the activation energy is called the transition state. If I remember correctly It is the point in which all the atoms or molecules (involved in the reaction) collide in the correct orientation to brake the bonds of the reactants and form the bonds in the products.

I hope this helps. Let me know if anything is unclear.

Answer:

activated complex.

Explanation:

What are energy sublevels? (A)multiple energy levels of any magnitude within an energy level
(B)multiple orbitals of specific magnitude within an energy level
(C)only those energy levels that overlap others
(D)electrons whose energy has dropped to a lower state

Answers

Answer:

Option B

Explanation:

First, we need to know what is an energy level.

An energy level corresponds to the row of the periodic table of element. So, if you see the attached picture, you can see that we have 7 rows where the elements are distributed, so, we have 7 energy levels for all those elements.

Knowing that, the sub levels are the caps where the electrons of the atoms are carried. These sublevels or caps, are called orbitals, these can be of several types

s orbytal: can hold 2 electrons

p orbytal: can hold up to 6 electrons.

d orbytal: can hold up to 10 electrons

f orbytal: can hold up to 14 electrons

g orbytal: can hold up to 18 electrons.

Depending on the row (or energy level) and the atom, we can know how many electrons can carry an element, in which period or row is, and the sub levels. For example, the Chlorine, with an atomic number of 17, can carry up to 7 electrons in it's outer level and it's on the third row (two energy levels). This can be known with it's electronic configuration:

[Cl] = 1s^2 2s^2 2p^6 3s^2 3p^5

The last energy level is 3, so it's the third period, and the electrons of those sub level are 2 and 5, 7 electrons.

Hope this can help better

The answer is B: multiple orbitals of specific magnitude within an energy level

The chemical symbol for sodium is
a. Sn.
b. N.
c. S.
d. Na.

Answers

For this question the answer would be D. Na is the chemical symbol for sodium.

The answer would be D.

How many grams of KNO3 would recrystallize from 100 g of water, if a saturated solution were cooled from 50 degrees celcius to 20 degrees celcius?

Answers

Answer:

$m_(cryst)=58g$

Explanation:

Hello there!

In this case, according to the attached solubility chart, it is possible for us to realize that about 88 grams of KNO3 are soluble at 50 °C but just 30 grams are soluble at 20 °C in the same 100 g of water.

In such a way, the crystalized mass of this solute can be calculated by subtracting the mass at 50 °C and the mass at 20 °C:

$m_(cryst)=88g-30g\n\nm_(cryst)=58g$

Best regards!

Absorption of energy into the refrigerant causes a phase change from _____.solid to liquid
liquid to vapor
vapor to liquid
liquid to solid

Answers

liquid to solid i think

the answer is liquid to gas :)

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