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3 years ago

9

Which conclusion was drawn from the results ofthe gold foil experiment?(1) an atom is electrically neutral.(2) an atom is mostly

empty space.(3) the nucleus of an atom is negativelycharged.(4) the electrons in an atom are located inspecific shells.

1 answer:

damaskus [11]3 years ago

5 0

2) An atom is mostly empty space

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Farm water runoff, which causes nitrogen rich fertilizer to be washed into the body of water. The nitrogen feeds the algae bloom.. Hope this helps

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3 years ago

What is the lowest unoccupied molecular orbital in F2?

Juliette [100K]

Answer:

σ*2pₓ, also called $3\sigma_{u}\text{*}$

Explanation:

I have drawn the MO diagram for fluorine below.

Each F atom contributes seven valence electrons, so we fill the MOs of fluorine with 14 electrons.

We have filled the $\pi \text{*2p}_{y}$ and $\pi \text{*2p}_{z}$ MOs.

They are the highest occupied molecular orbitals (HOMOs).

The next unfilled level (the LUMO) is the σ*2pₓ orbital. If you use the symmetry notation, it is called the $3\sigma_{u}\text{*}$ orbital.

This is the orbital that fluorine uses when it acts as an electron acceptor.

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3 years ago

Identify from the following list of molecules and ions which behave as Lewis acids: CO2, NH3, BCl3, Fe3+. (A) CO2 and NH3 (B) NH

allsm [11]

Answer : The correct option is, (D) CO₂, BCl₃, and Fe³⁺

Explanation :

According to the Lewis concept, an acid is defined as a substance that accepts electron pairs and base is defined as a substance which donates electron pairs.

(a) $CO_2$

It is a Lewis-acid because it can accepts electron pairs.

(b) $NH_3$

It is not a Lewis-acid because it can not accepts electron pairs but it is a base because it can donates and accept hydrogen ion.

(c) $BCl_3$

It is a Lewis-acid because it can accepts electron pairs because it has an incomplete octet and an empty 2p orbital.

(d) $Fe^{3+}$

It is a Lewis-acid because it can accepts electron pairs.

Hence, the ions which behave as Lewis acids are, CO₂, BCl₃, and Fe³⁺

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3 years ago

In the reaction MgCl2 + 2KOH → Mg(OH)2 + 2KCI, how many grams of KOH

dsp73

Answer:

The correct option is;

D. (2)(56 g)

Explanation:

MgCl₂ + 2KOH → Mg(OH)₂ + 2KCl

From the balanced chemical reaction equation, we have;

One mole of MgCl₂ reacts with two moles of KOH to produce one mole of Mg(OH)₂ and 2 moles of KCl

Therefore, the number of moles of KOH that react with one mole of KCl = 2 moles

The mass, m, of the two moles of KOH = Number of moles of KOH × Molar mass of KOH

The molar mass of KOH = 56.1056 g/mol

∴ The mass, m, of the two moles of KOH = 2 moles × 56.1056 g/mol = 112.2112 grams

The amount in grams of KOH that react with one mole of MgCl₂ = 112.2112 grams ≈ 112 grams = (2)(56 g).

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4. Explain error and how it can impact your results from an experiment

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