CHEMISTRY HIGH SCHOOL

How do you find a Oxidation number

Answers

Answer 1
Answer: An oxidation number is the charge of the ion that would form if a covalent molecule was ionic. Oxidation numbers exist for covalent compounds, as ions are not formed.

The oxidation number is determined by the respective electronegativity of the atoms involved. A more electronegative element will always have a negative oxidation number. In the compound, all the oxidation numbers must add up to 0. Oxidation numbers of elements can vary between compunds.

A few rules to follow about oxidation numbers
Fluorine will always be -1
Oxygen will be -2 unless in a compound with fluorine
Hydrogen is usually +1

A few examples
HF (Hydrogen flouride) Oxy number of H= +1 and F = -1

H2O Oxy number of H = +1  and O= -2

NH3 Oxy of H= +1 and since there are 3 Hydrogens each with an oxidation number of +1 N must have an oxy number of -3 for the overall oxidation number of the compound to be 0.  

H2SO4 Oxy number of H= +1 O=-2 When adding up the hydrogen and oxygen oxidation numbers ( 1 + 1 -2 - 2 -2 -2) we are left with -6 thus S must have an oxidation number of +6 for the overall number to be 0. 

NO2 Oxidation number of O= -2 there are 2 oxygens leaving us with -4 thus N must have an Oxy number of +4 for the overall number to be 0.

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Which list includes three types of chemical formulas for organic compounds? 1. covalent, metallic, isotopic 2. covalent, metallic, molecular 3. empirical, structural, isotopic 4. empirical, structural, molecular

Answers

Option D is the correct answer. The three main formula for organic compounds are: Empirical formula (ratio of all atoms present in the compound), Structural Formula (graphic representation of the compund's structure and Molecular Formula (the total number and the total types of atoms present)

Answer: Option is the correct answer which is 4) Empirical, structural, molecular

Which type of change must occur to form a compound?(1) chemical (3) nuclear(2) physical (4) phase

Answers

To form a compound, we need to change the structure of the molecules and mostly form new bonds between molecules to result in a compound.

A nuclear change changes the element completely and forms new elements, so nuclear is a wrong choice.
A phase change only changes the phase of the element (solid, liquid or gas) but does not change structure, so phase is a wrong choice
A physical change does not change the structure of the molecules, so physical is also a wrong choice.

On the other hand, a chemical change changes the structure of molecules and/or breaks/forms bonds.
Therefore, the right choice is chemical.

Answer:

1) Chemical

Explanation:

What is the IUPAC name for the compound FeS?(1) iron(II) sulfate (3) iron(II) sulfide
(2) iron(III) sulfate (4) iron(III) sulfide

Answers

The correct answer is option 3. The IUPAC name is Iron(II) sulfide. It is the less stable amorphous form.  When this is powdered, it is pyrophoric or it ignites spontaneously in air. It readily reacts with hydrochloric acid producing hydrogen sulfide.

The IUPAC name for the compound FeS is "iron(II) sulfide." Therefore, option 3 is correct.

The IUPAC (International Union of Pure and Applied Chemistry) name is a systematic way of naming chemical compounds.

The compound FeS consists of iron (Fe) and sulfur (S) atoms. In FeS, iron has a +2 oxidation state, and sulfur has a -2 oxidation state.

According to the IUPAC nomenclature rules for naming inorganic compounds, the cation (iron) is named first, followed by the anion (sulfide).

To indicate the oxidation state of iron, the Roman numeral II is used in parentheses after the name "iron." The resulting name is "iron(II) sulfide."

To learn more about IUPAC, follow the link:

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Ionic crystals are excellent insulators and can hold a large amount of heat before melting or boiling.TRUE

FALSE

Answers

It is a true fact that ionic crystals are excellent insulators and can hold a large amount of heat before melting or boiling. The correct option among the two options that are given in the question is the first option. Salt is a great example of ionic crystals and we know that it takes a huge amount of time to melt or boil.

10. How many g of Cu(OH)2 can be made from 9.1 x 1025 atoms of O?

Answers

Molar mass Cu(OH)₂ = 97.561 g/mol

97.561 g Cu(OH)₂ --------------- 6.02x10²³ atoms
  ? g Cu(OH)₂ -------------------- 9.1x10²⁵ atoms

mass = 9.1x10²⁵ * 97.561 / 6.02x10²³

mass = 8.87x10²⁷ / 6.02x10²³

mass = 14734.2 g

hope this helps!

Which of the following is an example of how to supply activation energy to begin a reaction?a. Cool the reaction flask in an ice bath.
b. Add a catalyst.
c. Heat the reaction flask on a hot plate.
d. Add an inhibitor. '

Answers

The event that is an example of how to supply activation energy to begin a reaction is adding a catalyst. The answer is letter B. Cooling the reaction flask in an ice bath, heating the reaction flask on a hot plate. And adding an inhibitor does not answer the question.
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