1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
olganol [36]
3 years ago
14

How to find the oxidation number of an element

Chemistry
1 answer:
Virty [35]3 years ago
3 0
The thing you MUST do FIRST is look for any H's, O's, or F's in the equation

1)any element just by itself not in a compound, their oxidation number is 0
ex: H2's oxidation number is 0
ex: Ag: oxidation number is 0 if its just something like Ag + BLA = LALA

2) the oxidation number of H is always +1, unless its just by itself (see #1)
3) the oxidation number of O is always -2, unless its just by itself (see #1)
4) the oxidation number of F is always -1, unless its just by itself (see#1)


ok so after you have written those oxidation numbers in rules 1-4 over each H, F, or O atom in the compound, you can look at the elements that we havent talked about yet

for example::::
N2O4

the oxidation number of O is -2.

since there are 4 O's, the charge is -8. now remember that N2O4 has to be neutral so the N2 must have a charge of +8
+8 divided by 2 = +4

N has an oxidation number of +4.

more rules:
5) the sum of oxidation numbers in a compound add up to 0 (when multiplied by the subscripts!!!) (see above example)
6) the sum of oxidation numbers in a polyatomic ion is the charge (for example, PO4 has a charge of (-3) so

oxidation # of O = -2. (there are 4 O's = -8 charge on that side ) P must have an oxidation number of 5. (-8+5= -3), and -3 is the total charge of the polyatomic ion
You might be interested in
What traits do all organisms with no internal themoregulation have?
Nesterboy [21]
Ectothermy and Endothermy
4 0
3 years ago
Read 2 more answers
Level 1: 2Sr + 02 > 2Sro
tekilochka [14]

Answer:

Sr would be the limiting reactant

5 moles

Explanation:

Since the equation is a balanced equation, the coefficient shows how each substance relates to the other in terms of the number of moles.

Reactants would be those on the left hand side of the arrow, while the products would be found on te right and side of the arrow. In this question, the reactants would be Sr and O₂.

Limiting reactant is the reactant that is insufficient; meaning to say that there is not enough of that substance and thus the reaction cannot continue. The other reactant(s) that is not limiting is called the excess reactants.

From the balanced equation, 2 moles of Sr is needed to react with 1 mole of O₂. Thus, if we have 5 moles of each reactant, Sr would be the limiting reactant since for every 1 mole of O₂, there has to be 2 moles of Sr in order for the reaction to proceed. Thus, if we have 5 moles of O₂, we would need 10 moles of Sr.

When we work out the amount of products formed, we look at the number of moles of the limiting reactant. This is because the limiting reactant determines how much is being reacted, while the excess number of moles of the excess reactant will remain unreacted.

For every 2 moles of Sr reacted, 2 moles of SrO would be produced. This means that the mole ratio of Sr to SrO is 1:1. Thus, since 5 moles of Sr has been reacted, 5 moles of the product (SrO) would be produced.

8 0
2 years ago
What is the meaning of N, E, M, and S in periodic table Need ASAP!
Luba_88 [7]

Answer:

Molybdenum is M, Einsteinium is E, and N is Nitrogen. Lastly, S is sulfur.

4 0
2 years ago
Van der Waals bonds initiate
brilliants [131]

I think e no

I am giving you hint

7 0
2 years ago
What is the number 0.0062985632 written in scientific notation to three significant figures?
enot [183]
0.0062985632

6.30 x 10^ -3

( Its 6.29 but if you are rounding to the nearest thousandths then its 6.30 x 10 to the power of -3 since jumped 3 spaces back. Remember that when it starts with a 0 , you are moving to the first digit which in this case is 6)

- you're welcome
7 0
2 years ago
Read 2 more answers
Other questions:
  • A 56.8g sample of aluminum is heated from 79.5°C to 143.7°C. The specific heat capacity of aluminum is 0.900 J/(g*K). Calculate
    12·1 answer
  • Which physical property of water best allows solutes dissolved in it to be separated using simple distillation?
    12·1 answer
  • Which of the following will result in a chemical change?
    10·2 answers
  • 15 POINTS!!!
    14·2 answers
  • Assuming complete distribution, what is the molarity of 10 milligrams of lisinopril in 100 liters?
    12·1 answer
  • Define and then describe the difference between a polar covalent bond, nonpolar covalent bond and ionic bond.
    6·1 answer
  • What is the mass of water necessary to generate 11.2 L of hydrogen gas if calcium metal reacts with water at standard temperatur
    11·1 answer
  • On the graph, which shows the potential energy curve of two N atoms, carefully sketch a curve that corresponds to the potential
    5·1 answer
  • When would scientists need to change a theory?
    12·2 answers
  • Question 9 (4 points)
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!