What is the oxidation state of an individual phosphorus atom in PO33−?


Answer 1

Express the oxidation state numerically (e.g., +1).

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In an ion, the sum of the oxidation states is equal to the overall ionic charge. Note that the sign of the oxidation states and the number of atoms associated with each oxidation state must be considered. In OH−, for example, the oxygen atom has an oxidation state of −2 and the hydrogen atom has an oxidation state of +1, for a total of (−2)+(+1)=−1.

Part C

What is the oxidation state of an individual phosphorus atom in PO33−?

Express the oxidation state numerically (e.g., +1).

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Part D

What is the oxidation state of each individual carbon atom in C2O42−?

Express the oxidation state numerically (e.g., +1).

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Assume that 8.5 L of iodine gas (I2) are produced at STP according to the following balanced equation: 2KI(aq) + Cl2(g) → 2KCl(aq) + I2(g)

How many moles of I2 are produced?
How many moles of Cl2 are used?
How many grams of Cl2 (g) are used?



a) 0.38 mol.

b) 0.38 mol.

c) 26.94 g.


  • For the balanced equation:

2KI(aq) + Cl₂(g) → 2KCl(aq) + I₂(g),

It is clear that 2 mol of KI react with 1 mol of Cl₂ to produce 2 mol of KCl and 1 mol of I₂.

a) How many moles of I₂ are produced?  

  • Firstly, we need to calculate the no. of moles of 8.5 L of produced I₂:

It is known that every 1.0 mol of any gas occupies 22.4 L at STP conditions.

Using cross multiplication:

1 mol of I₂ occupies → 22.4 L, at STP.

??? mol of I₂ occupies → 8.5 L, at STP.

∴ The no. of moles of I₂ produced = (1 mol)(8.5 mol)/(22.4 L) = 0.38 mol.

b) How many moles of Cl₂ are used?

Using cross multiplication:

1 mol of Cl₂ produces → 1 mol of I₂, from stichiometry.

∴ 0.38 mol of Cl₂ produces → 0.38 mol of I₂.

So, the no. of moles of Cl₂ are used = 0.38 mol.

c) How many grams of Cl₂(g) are used?

∴ The "no. of grams" of Cl₂(g) are used = (no. of moles of Cl₂)(molar mass of Cl₂) = (0.38 mol)(70.9 g/mol) = 26.94 g.


Which 2 elements have similar characteristics? A. Neon and fluorine
B. Chlorine and sulfur
C. Fluorine and chlorine
D. Oxygen and chlorine
E. Argon and fluorine


B. Chlorine and Sulfur

Which layer of the earth has the most mass and volume? the upper mantle or the lower mantle?


I think it may be the upper mantle. Sorry if I'm wrong!
Its the upper mantel because it has a higher circumference then the lower mantle and it take up more space underneath the crust. where as the lower mantel doesnt take up much space and its closer to the core. making take up not alot of space

Assuming all orbitals are in the same energy level which type of orbital has the lowest energy



s atomic orbital


Lets us consider 4s, 4p, 4d and 4f. Here 4 is the energy level or the principal quantum number. For all the atomic orbital s, p, d and f the energy level is the same. But the energy level of each  

Atomic orbital is different. s atomic orbital has the lowest energy followed by p, d and f.  

Arranging the atomic orbitals in order of increasing energy:

s < p < d < f

The correct answer is S orbital (apex)


Calculate the molarity of 0.50 mol MgCl2 in 750 ml of solution.


Answer : The correct answer for molarity of MgCl₂ solution is 0.67 M.

Molarity :

It expresses concentration of any solution . It can be defined as mole of solute present in volume of solution in Liter .

It uses unit M or

It can be formulated as :

Given : mol of MgCl₂ (solute ) = 0.50 mol

Volume of solution = 750 mL

Following steps can be done :

Step 1 ) To convert volume of solution from mL to L

1 L = 1000 mL

Volume of solution = 0.750 L

Step 2) To find molarity

Plugging mole of solute and volume of solution in molarity formula as :

Hence molarity of MgCl₂ solution is 0.67 M

Molarity = mol/L

0.50 mol of MgCl2
0.750 L (1000 mL = 1 L)

Molarity = 0.5 mol/0.75 L = 0.666667 M

What does integumentary mean?


Integumentary is the organ system that protects the body from various kinds of damage. 
It means relating to!

Who suggested that the molecular formula for water is H2O not OH


Its H2O whoever said ho is wrong            

The glycogen debranching enzyme is required for the transfer of 3-glucose units from one branch to another.
the transfer of phosphate from one position to another.
cleaving alpha (1 to 6) sugar linkages
A and C
A, B and C



A and C

A. the transfer of 3-glucose units from one branch to another.

C. cleaving alpha (1 to 6) sugar linkages


Glycogenolysis Enzymes

Two enzymes participate in glycogenolysis:

Glycogen phosphorylase, which catalyzes phosphorolysis or phosphorolytic cleavage of alpha 1-4 glycosidic bonds, which consists of the sequential separation of glucose residues from the non-reducing end, depending on the reaction:

(glucose) n + Pi3 ← → (glucose) n-1 + glucose-1-P

This reaction is very advantageous for the cell, compared to one of hydrolysis.

Glycogen debranching enzyme.

Glycogen phosphorylase cannot cleave O-glycosidic bonds in alpha (1-6). The glycogen de-branching enzyme has two activities: alpha (1-4) transferase glycosyl that transfers each unit of trisaccharide to the non-reducing end, and eliminates branching by alpha 1-6 glycosidic bonds:

glucose-6-P + H2O2 → glucose + Pi


While working on a pH lab, Alex spilled strong acid all over the table. What should Alex's first step be to remedy this problem? A) Inform his teacher.
B) Wipe it up with a paper towel.
C) Light it on fire to burn it off the table.
D) Mix it with a base and wipe it with a cloth rag.


While working in the laboratory safety measures must be followed to avoid accidents and injuries. Alex should inform his teacher after spilling strong acid. Thus, option A is correct.

What is a strong acid?

A strong acid is characterized by the dissociation ability of the hydrogen ions completely in an aqueous solution. They should be handled carefully as they are highly corrosive in nature.

Working in the laboratory should maintain safety and at first, Alex should inform his teacher as they will be able to properly guide and help to clean the chemical.

The strong acid must be cleaned by adding a base to it so that it will get neutralize and then can be cleaned with absorbent material and water to dispose of.

Therefore, option A. Alex should inform his teacher.

Learn more about acid spills here:



The correct answer is A) Inform his teacher


The reason that he want to inform his teacher is that since the acid is so strong the teacher can get the right things to clean up the mess.  

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