Answer:
+4
Explanation:
In PbO
2
, oxygen exhibits an oxidation number of −2 (since it's not a peroxide or superoxide).
Let the oxidation number of Pb be x. Then, for the compound to be neutral, the oxidation numbers of all atoms should add up to zero.
⇒x+(−2)+(−2)=0
x=+4
So the oxidation no. of Pb is +4.
The lead (Pb) oxidation number in [tex]\rm PbO_2[/tex] is +4, whereas the oxygen (O) oxidation number is -2.
The idea of oxidation number, also known as oxidation state, is used in chemistry to describe the potential charge that an atom would have if electrons were completely transported in a chemical bond or reaction. It is a valuable instrument for tracking electron distribution in a chemical or ion and understanding redox (oxidation-reduction) reactions. Understanding redox processes, which involve the transfer of electrons between reactants, requires an understanding of oxidation numbers.
Oxidation number of Pb is given as:
(+x) + 2(-2) = 0
x - 4 = 0
x = +4
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complete and balance the following equation b. na2 co3
the question isnt clear where are the products ir the reactants like __ = ___ + ___
How does pathogen infection result in the occurrence of fevers in a host?
Edema caused by the pathogen raises the body temperature..
The pathogens break down the host's hypothalmus..
Pyrogens produced by the pathogen alter the host thermostat.
The interaction between PAMPs and PRPs causes a respiratory burst.
Answer:
The answer is Edema caused by the pathogen raises the body temperature. :)
Have an amazing day!!!
Please rate and mark brainliest!!
Why is carbon dioxide a necessary part of the atmosphere.
Answer:
it gives plants life and plants give us oxygen
what are the products for the following equation?
LiBr + F ->
[tex]\qquad\qquad\huge\underline{{\sf Answer}}♨[/tex]
Here's the balanced chemical equation for above reaction ~
[tex]\qquad \sf \:LiBr + F \rightarrow Li F + Br[/tex]
Here, fluorine is more more more reactive than Bromine, therefore it replaces Bromine from its compound and forms Lithium floride.
The parmo is a dish made from breaded meat and cheese sauce that originated in which english town?.
Answer:
Middlesbrough, North Yorkshire
,,Explanation:
What type of probes physically land on the surface of a planet or moon?
Answer:
Here are three types of probes that land on space physically. Interplantery, orbiters, and landers.
Explanation:
These are the ones that collect data and other stuff from space.
What is the most significant solute in determining the distribution of water among fluid compartments
Answer:
Sodium (Na+)
Explanation:
Volume status is regulated through the monitoring of systemic solute per unit volume, or osmolarity. Sodium, the most prominent electrolyte 'solute' in extracellular fluid, is used to monitor extracellular osmolarity. A disproportionate loss of water relative to sodium results in a concentrating osmolar effect.
help please giving brainliest!
Answer:
a reaction that can occur in both forward and reverse directions at the same time.
Explanation:
This is because ↓
A reversible reaction is a reaction in which the conversion of reactants to products and the conversion of products to reactants occur simultaneously. A and B can react to form C and D or, in the reverse reaction, C and D can react to form A and B.
Hope this helps =)
Jin listed some common thermal insulators and conductors in a chart. (attached below)
Which belongs in the area marked with an X?
A.) Iron
B.) Foam
C.) Wood
D.) Glass
Have a great rest of your day
#TheWizzer
Answer:
I would have to say the answer is A) iron. I say this because Iron is one of the most well know conductors and in the chart it as rubber and copper as the two conductors whole Air and Iron should be the x. Plus the rest don't make good conductors they are more insulators. So logicaly it wouldn't make sense to have any of the other answers.
Explanation:
Hope This Helps
Have A Great Day
~Zero~
According to the concept of conduction, iron belongs in the area marked with an X.
What is conduction?Conduction is defined as a process as a means of which heat is transferred from the hotter end of the body to it's cooler end.Heat flows spontaneously from a body which is hot to a body which is cold.
In the process of conduction,heat flow is within the body and through itself.In solids the conduction of heat is due to the vibrations and collisions of molecules while in liquids and gases it is due to the random motion of the molecules .
When conduction takes place, heat is usually transferred from one molecule to another as they are in direct contact with each other.There are 2 types of conduction:1) steady state conduction 2) transient conduction.According to the type of energy conduction is of three types:
1) heat conduction
2) electrical conduction
3)sound conduction
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ANSWER FAST PLS ILL GIVE BRAINLY 5. What are animals called that make their homes underground?
grazers
reptiles
burrowers
meat-eaters
Answer:
burrowers
Explanation:
I Need help with this worksheet I Need the Work Please Thank you
1. a. 3
b. 2
2. a. 4
b. 6
3. a. 1
b. 2
4. a. 5
Which is older? Dinosaurs or Grasshoppers?
Answer:
i think grass hopper
Explanation:
answer my question i am am brainiest
ID: A
8. Gold is reacted with chlorine gas according to the reaction 2 Au + 3Cl2 → 2 AuClz. Use the data in the table
to determine the percent yield of gold chloride.
Mass of Gold
Mass of Chlorine Theoretical Yield Actual Yield
39.4 g
?
35.2 g
21.3 g
a. 60.7%
b. 54.1 %
c. 58.1 %
d. 51.4 %
9. How many moles of Al would be produced from 20 moles of AlO3?
A. The percentage yield of gold chloride is 58%
B. The number of mole of Al produced is 40 moles
A. How to determine the percentage of gold2Au + 3Cl₂ → 2AuCl₃
Molar mass of Au = 197 g/mol
Mass of Au from the balanced equation = 2 × 197 = 394 g
Molar mass of Cl₂ = 2 × 35.5 = 71 g/mol
Mass of Cl₂ from the balanced equation = 3 × 71 = 213 g
Molar mass of AuCl₃ = 197 + (3×35.5) = 303.5 g/mol
Mass of AuCl₃ from the balanced equation = 2 × 303.5 = 607 g
We'll begin by determining the limiting reactant
From the balanced equation above,
394 g of Au reacted with 213 g of Cl₂
Therefore,
39.4 g of Au will react with = (39.4 × 213) / 394 = 21.3 g of Cl₂
From the above, both Au and Cl₂ are limiting reactant.
Next, we shall determine the theoretical yield.
From the balanced equation above,
394 g of Au reacted to produce 607 g of AuCl₃
Therefore,
39.4 g of Au will react to produce = (39.4 × 607) / 394 = 60.7 g of AuCl₃
Thus, the theoretical yield of AuCl₃ is 60.7 g
Finally, we shall determine the percentage yield.
Actual yield = 35.2 g
Theoretical yield = 60.7 g
Percentage yield =?
Percentage yield = (Actual / Theoretical) × 100
Percentage yield = (35.2 / 60.7) × 100
Percentage yield = 57.99%
Percentage yield ≈ 58%
B. How to determine the mole of Al producedBalanced equation
2Al₂O₃ → 4Al + 3O₂
From the balanced equation above,
2 moles of Al₂O₃ produced 4 moles of Al
Therefore,
20 moles of Al₂O₃ will produce = (20 × 4) / 2 = 40 moles of Al
Thus, 40 moles of Al were obtained from the reaction.
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Anyone know this? Cuz I don’t this one is
Answer:
its legislative.
A buffer solution is prepared by adding NH4Cl to a solution of NH3 (ammonia).
NH3(aq) + H2O(I) = NH4+(aq) +OH-(aq0
What happens if Ca(NO3)2 is added?
Shifts to reactants, remain the same, shifts to products.
Please HELP!
I watched the video, but I still don't get it!
I don't know how this works
Answer:
Remains the same
Explanation:
I just got it right on Acellus!
Sodium Hydroxide, which is a base, has a pH of _____
a
2
b
3
c
14
d
6
Answer:
c
Explanation:
Given that sodium hydroxide is a base, it's pH has to be above pH 7. Thus, option c is the correct option.
On the other hand, acids have a pH of lesser than 7 while pure water has a pH of 7. All the other options have a pH of less than 7, indicating that they are acids.
what are the basic elements of environment
Answer:
the basic elements of environment are lithosphere, hydrosphere, atmosphere and biosphere.
Explanation:
The interstitial fluid is generally poor, while the plasma is generally rich in ---------. A. Protein B. Sodium and chloride ions C. Hydrogen ions D. Carbohydrates
Answer:
B Hydrogen Ions is answer
Pregnant women are often cautioned against cleaning cat litter boxes. This is because Toxoplasma, an intestinal parasite of cats, can be transmitted from infected feces to the expectant mother and ultimately to the fetus. For these reasons, Toxoplasma is considered
....
a noninfectious disease.
a communicable disease.
an addictive disease.
a nosocomial disease.
a zoonotic disease.
a necrotizing disease..
Answer:
A communicable disease
Explanation:
Diseases that can be transferred are known as communicable diseases.
HELP ANYONE PLEASE ASAP TYY!!!
An envelope could be a source of DNA evidence.
True
False
Answer:
True
Explanation:
DNA can be extracted from bite marks, cigarette buds, postage stamps on envelopes, and envelope flaps for DNA analysis.
Answer:
false. a envelope is what the DNA evidence goes in
Explanation:
At body temperature, 2404 J is required to evaporate 1 g of water. After vigorous exercise, a person feels chilly because the body is giving up heat to evaporate perspiration. A typical person perspires 25 mL of water after 20 minutes of exercise. How much body heat is used to evaporate this water
Answer: - 1.45 kJ
Explanation:
Using q = m x C x (ΔT)
Given : m = 3.8 g , C = 0.900 J/g°C, = -(450-25)°C = -425°C (Since final temperature is less than the initial, the sign is negative)
q = (3.8 g) x (0.900 J/goC) x ( -425 °C)
= -1453.5 J
= -1.45 kJ
Note that negative sign of q indicates that this much heat is released, when the metal cools down.
If 40mL of 2.50M HCl neutralizes 500ml. of KOH, what is the molarity of the KOH?
The molarity of the 500 mL KOH solution needed to neutralize the 40 mL of 2.50 M HCl is 0.2 M
Balanced equationHCl + KOH —> KCl + H₂O
From the balanced equation above,
The mole ratio of the acid, HCl (nA) = 1
The mole ratio of the base, KOH (nB) = 1
How to determine the molarity of KOH Volume of acid, HCl (Va) = 40 mLMolarity of acid, HCl (Ma) = 2.5 MVolume of base, KOH (Vb) = 500 mL Molarity of base, KOH (Mb) =?MaVa / MbVb = nA / nB
(2.5 × 40) / (0.15 × Vb) = 1
100 / (Mb × 500) = 1
Cross multiply
Mb × 500 = 100
Divide both side by 500
Mb = 100 / 500
Mb = 0.2 M
Thus, the molarity of the KOH solution needed is 0.2 M
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What amount of heat is required to increase the temperature of 75.0 g of water from 22.3˚C to 36.1˚C?
Answer:
4332.5 j
Explanation:
Specific heat of water is 4.186 j /g-C
4.186 j / g-C * 75 g * (36.1-22.3 C) =
1. -A mixture of aluminum metal and chlorine gas reacts to form aluminum chloride (AlCl3): 2Al(s) +
3Cl2(g) → 2AlCl3(s). How many moles of aluminum chloride will form when 5 moles of chlorine gas react
with excess aluminum metal?
Answer:
3.33 moles
Explanation:
We know that our limiting reactant is chlorine so we just have to figure out how much of the product aluminum chloride (AlCl3) would be formed from 5 moles of chlorine gas. As we can see in the balanced equation, the mole ratio of chlorine gas (Cl2) to aluminum chloride is 3:2 based on the coefficients of the species. All you have to do from here is divide the amount of moles of chlorine gas by its own coefficient and then multiply the number you receive by the coefficient of AlCl3.
5/3=1.66
1.66*2=3.33
How many atoms in total are present in sucrose C12H2011 weighs 1.4 mg
Answer:
2.46×10²¹atoms
Explanation:
[tex]molar \: mass \: of \: the \: sucrose = 12(12) + 22(1) + 11(16) \\ = 144 + 22 + 176 \\ = 342g {mol}^{ - 1} \\ mole = \frac{1.4 \times {10}^{ - 3} }{342} \\ = 4.09 \times {10}^{ - 6} \\ number \: of \: atoms = 4.09 \times {10}^{ - 6} \times 6.022 \times {10}^{23} \\ = 2.46 \times {10}^{21} atoms[/tex]
If one 330 mL Coca-Cola contains 170 grams of dissolved C*O_{2} how many H^ + ions are made if 70% of the dissolved C*O_{2} reacts completely with water until it is a simple carbonate ion (CO 3 ^ 2- ) ?
Please help me!!!
Answer:
bu bir kimya sorusu sanırim
If 162.35 g aluminum hydroxide are dissolved in 6750 mL of solution, what is the concentration of the solution?
If 162.35 g aluminum hydroxide are dissolved in 6750 mL of solution, the concentration of the solution is 0.308M
How to calculate concentration?The concentration of a solution can be calculated using the following formula:
Molarity = no of moles ÷ volume (L)
However, the number of moles in 162.35g of Al(OH)3 must be calculated as follows:
Molar mass of Al(OH)3 = 78g/mol
no of moles = 162.35g ÷ 78mol
no of moles = 2.08mol
Molarity = 2.08mol ÷ 6.75L
Molarity = 0.308M
Therefore, if 162.35 g aluminum hydroxide are dissolved in 6750 mL of solution, the concentration of the solution is 0.308M.
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which molecule can't be exist?
A)NCl3 B)OF6 C)ONF3 D)PCl3
Answer:
OF6
Explanation:
Oxygen and fluorine have almost the same electronegativity, so oxygen isn't able to donate enough electron density to fluorine to form OF6. Atomic size. There isn't enough room around an oxygen atom for six fluorine atoms.
:-befrank
A solution was made using NaOH, the pH of the solution was found to be 11.452. What is the concentration of the hydroxide ion, OH^- in this solution
Answer:
i think it is 0.002831392
Explanation:
pOH = 14 - 11.452 = 2.548
pOH = -log(OH)
2.548 = -log(OH)
10^(-2548) = 0.002831392