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4 years ago

. how many lone pairs of electrons are present in the lewis structure of calcium sulfide?

Chemistry

1 answer:

miv72 [106K]4 years ago

7 0

Answer:
Four

Explanation:
Calcium Sulfide is an ionic compound made up of Ca²⁺ and S²⁻.
Ca²⁺ is formed as,

Ca → Ca²⁺ + 2 e⁻

These two electrons are accepte by Sulfur as,

S + 2 e⁻ → S²⁻

So, before accepting 2 electrons S was having six valence electrons, after accepting two electrons from Ca it has 8 electrons which are present in four pairs as shown below,

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A team of scientists claim that they have discovered a new element. Which of

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B. Another team of scientists must be able to replicate the results of

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Explanation:

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careful observation and measurement
detailed experiment
the formulation, testing, and modification of hypotheses

Through this, when a finding is made, before it can be acceptable by the scientific community, it must be tested through a series of experiments by other scientist. These scientists will also test for the validity of the claim that a new element has been discovered.

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3 years ago

What is the sum of protons and neutrons in an atomic nucleus?

Alexxandr [17]

The sum of protons and neutrons in an atomic nucleus would be the MASS NUMBER.

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3 years ago

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Answer:

190.4g

Explanation:

1.6mol of KBr (119.002g KBr/1 mol) = 190.4g

since you want to find grams, take the molar mass of KBr (119.002) per 1 mol and use it as your conversion factor (119.002g KBr/1 mol) which will then cancel out mols and leave you with grams.

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3 years ago

The molar mass of iron(Fe) is 55.8 g/mol. what is the mass in grams of 2.25 moles of iron?

AnnyKZ [126]

Try this solution:

if 1 mole is 55.8 gr., then 2.25 moles the mass should be 55.8*2.25=125.55 gr.

Answer: 125.55 gr.

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3 years ago

Bromine has a higher ionization energy than chlorine True or False

torisob [31]

Answer:

Chlorine

Explanation:

Since chlorine is above bromine in the periodic table, following the trends of ionization energy in the periodic, the further up you go the more energy is required to ionize an atom.

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