Answers
Balanced equation
2Pb(NO₃)₂⇒2PbO+4NO₂+O₂
Further explanationGiven
Reaction
Pb(NO₃)₂⇒PbO+NO₂+O₂
Required
Balanced equation
Solution
Give coefficientPb(NO₃)₂⇒aPbO+bNO₂+cO₂
Make equationPb, left=1, right=a⇒a=1
N, left=2, right=b⇒b=2
O, left=6, right=a+2b+2c⇒6=1+2.2+2c⇒6=5+2c⇒1=2c⇒c=1/2
The reaction becomes :
Pb(NO₃)₂⇒PbO+2NO₂+1/2O₂ x2
2Pb(NO₃)₂⇒2PbO+4NO₂+O₂
Related Questions
Which of the following descriptions would not be considered a chemical property of the substance?
A: iron rusts when exposed to oxygen
B: sodium is easily oxidized by other elements
C: limestone is corroded by acid rain
D: sugar dissolves when placed in water.
Answers
Why:
Chemical properties/changes produce NEW substances.
So when sugar dissolves in water, it breaks down, but NOT to a chemical level that separates its elements. Therefore, it would still be sugar and will not create a new compound/element.
This results in the conclusion that when sugar dissolves in water, it is a physical property, NOT chemical.
You all should know that...
you guys are amazing
I just wanted you to know that
that's it
you can stop reading
why are you still reading?
I said that was it so why are you reading
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I said stop!
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jk im not writing anymore
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JK AGAIN!
you are all...
wonderful
smart
beautiful (inside and out)
loved
and cared for
so don't go
you gotta be here
you gotta be here to spread your amazingness
because you are a queen/king
Answers
Answer:
Thank you I needed this
you are...
wonderful
smart
beautiful (inside and out)
loved
and cared for
so don't go
you gotta be here
you gotta be here to spread your amazingness
because you are a queen/king
YES YOU ARE and SO IS EVERYONE ELSE, I HOPE YALL ALL STAY SAFE AND HAVE A GREAT DAY >-<
a covalent compound that shares two pairs of electrons.
What is it?
Answers
write the chemical equation of the reaction between more active metal and more active non metal ?
Answers
Answer: Jump to Active Metal Reactions with Oxygen · The method used to predict the products of reactions of the main group metals is simple, yet remarkably powerful. Exceptions to its predictions arise, however, when very active metals react with oxygen, which is one of the most reactive nonmetals. It reacts with O2 to form an oxide that contains the O2- ion.
3 facts about earths layers?
Answers
The inner core is solid, fourth layer and made out of iron and nickel. It's the one mostly in charge for the other layers. If the inner core stopped spinning, the outer core would lose its magnetic field, and this will be bad because of the sun's radiation wave. Including the other layers.
The outer core is the liquid, third layer. It's in charge of Earth's magnetic field.
The mantle is the second layer of earth, the original temperature can come up about to 1000+ or more, celsius.
PLEASE HELP
In the equation 2KCIO3 → 2KC1 + 302, how many moles of oxygen are produced when 3.0 mol of KCIO3 decompose completely?
Answers
Moles of Oxygen produced : 4.5 moles
Further explanationA reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.
The reaction coefficient shows the mole ratio of the reactants and products
Reaction
2KCIO₃ → 2KCl + 30₂
moles of KCIO₃ = 3
From equation, mol ratio of KCIO₃ : O₂ = 2 : 3, so mol O₂ :
[tex]\tt mol~O_2=\dfrac{3}{2}\times 3=4.5[/tex]
Calculate the number of moles in a liquid sample of a substance that has a molar heat of fusion of 3.811 kJ/mol, if the sample releases 90.6 kJ when it freezes. Answer in units of mol Calculate the molar mass of the substance if the mass of the sample is 2022 g. Answer in units of g/mol.
Answers
Answer:
23.77mole,85.1g/mol
Explanation:
the moles of liquid is 23.77mole which is obtained by divide 90.6kj to 3.811kj/mol and molar mass is obtained from the formula of mole eg mole=mass/molar mass but mass is given and moles is obtained above.
When the molar mass of the significance of the mass of the sample is 2022 g is = 23.77mole, 85.1g/mol.
Calculation of Molar mass
When the molar mass of a chemical combination is defined as the mass of a sample of that compound separated by the amount of substance in that instance, measured in moles.
Although, The molar mass is a bulk, not molecular, property of a substance. The molar mass is an average of many instances of the combination, which often change in mass due to the existence of isotopes.
When the moles of liquid is 23.77mole which is received by dividing 90.6kj to 3.811kj/mol and molar mass is acquired from the formula of mole eg mole is = mass/molar mass but the mass is given and moles is conveyed above.
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PLS PLS PLS HELP ME I WILL MARK YOU BRINLYEST JUST PLS :((
Answers
Kelly is walking on the beach when she finds interesting right she picks it up exam is it in wonder what type of rock it is and how the rock is formed what type of Rocky Kelly fine and how can you tell and describe how this type of rock is formed
Answers
Answer:
She found a Sedimentary rock.
Explanation:
Rocks found on beaches are Sedimentary. (The upcoming and this sentence is pre-written and copy and pasted in every brainly question or comment I write or answer.) If this answer helped you please consider giving it brainliest. If my answer was wrong and you got marked wrong for it, I deeply apologize and hope you will forgive me, since everyone makes mistakes sometimes. If you need me to elaborate on my answer or give further explanation on it, please ask and I will do so. If you need to explain your reasoning on your work feel free to use my words- word for word- without crediting me, the answer was made for you anyways! Hope yall learn from my answer and it helps you in the future with assignments, quizzes, test’s, and more!
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The glancing angle (θ) of a Bragg reflection (n = 1) from a set of crystal planes separated by 99.3 pm is 10.42°. Calculate the wavelength of the X-rays that is used.
Answers
Answer:
wavelength λ = 35.92 pm
Explanation:
Given that:
The glancing angle (θ) = 10.42°
Bragg reflection n = 1
wavelength λ = ???
diameter d = 99.3 pm
Using the formula:
nλ = 2dsinθ
we have:
1 × λ = 2 × ( 99.3) × sin (10.42°)
λ = 198.6 × 0.18086
λ = 35.92 pm
The wavelength of the X-rays that is used is equal to 35.9 nanometers.
Given the following data:
Bragg reflection, n = 1Glancing angle (θ) = 10.42°.Distance between planes = 99.3 picometers.To calculate the wavelength of the X-rays that is used, we would apply Bragg's law of reflection:
Mathematically, Bragg's law of reflection is given by the formula:
[tex]n\lambda = 2dsin\theta[/tex]
Where:
n is Bragg reflection.d is the distance between crystal planes.[tex]\lambda[/tex] is the wavelength.[tex]\theta[/tex] is the reflection angle.Substituting the given parameters into the formula, we have;
[tex]1 \times \lambda = 2 \times 99.3 \times 10^{-11} \times sin(10.42)\\\\ \lambda = 1.99 \times 10^{-9} \times 0.1809\\\\\lambda = 3.59 \times 10^{-10}[/tex]
Wavelength = 35.9 nanometers.
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HELP PLEASE!!!!!
An experiment calls for each student to use 3.50 g of sodium hydroxide.
There is only 78.2 g of sodium hydroxide remaining. How many students An experiment calls for each student to use 3.50 g of sodium hydroxide.
There is only 78.2 g of sodium hydroxide remaining. How many students
can complete the experiment?
Select one:
a. 22 students
b. 0 students
c. 78 students
d. 273 students
Answers
Answer:
22 students
Explanation:
i just answered it for a quiz and its correct
What are small subunits or building blocks of a large molecule called?
A. Macromolecules
B. Monomer
C. Polymer
D. Organic
Answers
Answer:
c
Explanation:
PLEASE!!!
1.-All of the following are phases (states)
of matter EXCEPT:
A.- solid
B.- liquid
C.- gas
D.-putty
2.-Water is different from other substances because:
A.- It is more dense as a solid than a liquid B.- It is less dense as a solid than liquid
C.- it is more dense as a gas than a liquid
D.- It is less dense as a solid than a gas
3.-This matter has a fixed shape and
volume with particles closely packed together with little movement. It is a:
A.- liquid
B.-solid
C.- gas
D.- plasma
4.-Matter changing from a solid to a liquid is called:
A .-evaporation
B.- sublimation
C .-deposition
D.- melting
5.-The melting point of water is:
A.- 0°C
B .-100°C
C.- 32°C
D.- 60°C
6.-Water is different from other substances because:
A.- It is more dense as a solid than a liquid
B.- It is less dense as a solid than liquid
C.- it is more dense as a gas than a liquid
D.- It is less dense as a solid than a gas
7.-Which of the following substances has
a higher melting point than water?
A.- salt
B.- sugar
C.- flour
D.- all of the above
8.-Which of the following is NOT a way that matter changes phase?
A.- melting
B.- freezing
C.- evaporation
D.- mixing
9.-Matter changing from a solid to a gas is called:
A.- evaporation
B .-sublimation
C.- deposition
D.- melting
Phases of Matter - Vocabulary Quiz
10-15: Name the six ways the phase (state) of matter changes:
10. _____________________
11.______________________
12.______________________
13.______________________
14.______________________
16.______________________
Review Important Points about Phases of Matter
16) What is matter? _____________________________________________________________________________________ 17) Name the three phases (states) of matter? _____________________________________________________________________________________
18) Identify and describe the particle in each phase of matter and how they are different in each phase of matter.
Answers
i think the first one is B Second once is D and thord is B
In our system mainly four states of matter are present and they are solid, liquid, gas and plasma. In melting solid changes into liquid and in sublimation solid changes into gas.
What are states?States are those phases which gives idea about the arrangement of constituent particles in it and also states the physical properties.
Main states of matter that are exist are solid, liquid, gas and plasma.Density of water is less in the solid state a compared to the liquid state, that's why ice is always present above the liquid.Solid state has a perfect shape, orientation and arrangement of atoms within it.Melting is a process in which solid state changes into liquid state.Melting point of water is 0°C.Meling point of flour is higher among salt and sugar and it is equal to approx 220 degree celsius.Sublimation is a process in which solid changes into gaseous state for example, sublimation of camphor.Melting of ice, freezing of water, burning of camphor, melting of wax and formation of precipitates are the example of changes of states of matter.Hence all points are discussed above.
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Complete the sentence to describe muscle tissue. Muscle tissue in the body is made up of a group of ___________ working together to perform a common function.
Answers
Answer:
tissue is made by a group of cells
Answer:
cells
Explanation:
taking the test =)
name as many tv shows as you can!!!
if u name more than 10 you get brainilest!!
Answers
Answer:
Vampire diaries Freinds Twilight My little pony Thats it
Explanation:
Answer:
spongebob square pants
family guy
american dad
the cleveland show
teen titans go
robot chicken
the loud house
the Cassandras
the big bang theory
steven universe
Explanation:
is tasting an advisable method for identifying substance?why?
Answers
7. What is the mass in grams of 5.90 mol CgH1g? (l point)
0.0512 g
O19.4 g
389 g
O673 g
Answers
Answer:
m = 673 g
Explanation:
We need to find the mass of 5.90 mol of [tex]C_8H_{18}[/tex]
Molar mass of [tex]C_8H_{18}[/tex] is:
[tex]M=8\times 12+1\times 18\\\\=114\ g/mol[/tex]
Let m be the mass of 5.90 mol of [tex]C_8H_{18}[/tex]. Using mole concept to find it.
No of moles = mass/molar mass
[tex]m=5.9\times 114\\\\=672.6\ g\\\\\approx 673\ g[/tex]
So, the required mass is 673 g. Hence, the correct option is (d).
Answer:
673 g
Explanation:
if you started with 2.34 grams of methane and 8.32 grams of oxeygyn and the combustion reaction went to completion how many grams of CO2 would be produced
Answers
Answer:
Mass of CO₂ produced = 5.72 g
Explanation:
Given data:
Mass of methane = 2.34 g
Mass of oxygen = 8.32 g
Mass of CO₂ produced = ?
Solution:
Chemical equation:
CH₄ + 2O₂ → CO₂ + 2H₂O
Number of moles of methane:
Number of moles = mass/molar mass
Number of moles = 2.34 g/ 16 g/mol
Number of moles = 0.146 mol
Number of moles of oxygen:
Number of moles = mass/molar mass
Number of moles = 8.32 g/ 32 g/mol
Number of moles = 0.26 mol
Now we will compare the moles of carbon dioxide with oxygen and methane.
CH₄ : CO₂
1 : 1
0.146 : 0.146
O₂ : CO₂
2 : 1
0.26 : 1/2×0.26 = 0.13 mol
Less number of moles of CO₂ are produced by oxygen thus oxygen will react as limiting reactant.
Mass of CO₂:
Mass = number of moles × molar mass
Mass = 0.13 mol × 44 g/mol
Mass = 5.72 g
After his initial reaction, Mr. Evil has some time to think. He calls you on the phone with a new plan. “OK,” he says. “I don’t need to be able to tunnel to the bank today, but I need to be able to do it within the next 30 years. I have access to a house that is much closer. I need to know if it will be close enough.” What do you need to know in order to answer him? Under what conditions would this new property be close enough to the bank? PLEASE HELP ME PLEASEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
Answers
Answer:
After experiencing inescapable brutalities as a prisoner in a Nazi concentration camp, Mr. Stermberg becomes apathetic, stopped eating, and gave up all efforts to physically survive the ordeal. His reaction …
Explanation:
1. Which scenario best describes Newton's 1st law?
Answers
Answer:
option B . because acording to Newton 1st law until or unless you donot apply force the object will not move or stops.
Explanation:
State three uses of oxidation number
Answers
Answer:
Explanation:
1. To identify what's been oxidised and what's been reduced in a redox reaction
2. In naming compounds
3. To work out reacting proportions in titration reactions
Is the following sentence true or false?
Warm water cools the air above it
Answers
Answer: It dependes
Explanation: which kind of warm water? Hot or normal warm? Because if hot then yes (true) if normal warm then no (false) if it is hot water then the steam coming from it makes the air above it warm. If it is normal warm then there is not enough ( I should say hotness? I don’t know any other way to say it) to make steam to make the air above it hot.
How many grams make up 0.780 moles of calcium cyanide (CaCN)
Answers
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 71.84g is the mass of 0.780 moles of calcium cyanide.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
Mathematically, the formula for mole can be given as
mole of calcium cyanide=given mass of calcium cyanide ÷ molar mass of calcium cyanide
number of mole of calcium cyanide= 0.780 moles
mass of calcium cyanide=?
molar mass of calcium cyanide=92.1128 g/mol
Substituting the values in above formula we get
0.780 moles = mass of carbon ÷92.1128 g/mol
On calculations, we get
mass of calcium cyanide=71.84g
Therefore, 71.84g is the mass of 0.780 moles of calcium cyanide.
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What happens to the radiant energy comes from the sun to the earth
Answers
Answer: Once the sun's energy reaches earth, it is intercepted first by the atmosphere. A small part of the sun's energy is directly absorbed, particularly by certain gases such as ozone and water vapor. Some of the sun's energy is reflected back to space by clouds and the earth's surface.
Select the correct location on the. Image
Which of these four elements is the most reactive metal?
2
He
10
Ne
18
Ar
36
Kr
54
Xe
85 86
Rn
6
B
Be
12
Mg
20
Ca
38
Sr
17
CI
35
Br
53
16
14
Si
15
P
Na
19
K
37
Rb
34
Se
52
Te
32 33
31
Ga
49
In
81 82
TI
113
Nh
Ge
50
Sn
As
51
Sb
83
B
115
Mc
55 56
84
Cs
87
Fr
Ba
88
Ra
Pb
114
FI
Po
At
116 117 118
Lv
Ts Og
Answers
Answer:
detail is given below.
Explanation:
First of all we will discuss the reactivity trend.
As we move from left to right across the periodic table the number of valance electrons in an atom increase. The atomic size tend to decrease in same period of periodic table because the electrons are added with in the same shell. When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons. This effect lead to the greater nuclear attraction. The electrons are pull towards the nucleus and valance shell get closer to the nucleus. As a result of this greater nuclear attraction atomic radius decreases and ionization energy increases and reactivity decreases.
As we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased.
As the size of atom increases the ionization energy from top to bottom also decreases because it becomes easier to remove the electron because of less nuclear attraction and reactivity increases.
In this way rubidium is more reactive than sodium and indium is more reactive than Al.
but when we compare across period sodium is more reactive than Al while Ra is more reactive than In.
When you move one of the bonding pairs of a molecule closer to another one, what is the effect?
Answers
Answer:
They repel due to a force of repulsion
How many elements are in Na2CO3?
Answers
Answer:
3 i believe
Explanation:
Answer: 3
Explanation: I took the test!!!
Two answer multiple-choice-- please help!
What is true about reaction spontaneity and entropy?
The rusting of iron is a nonspontaneous process because rust particles have less entropy than iron, and reactions with a decrease in entropy are nonspontaneous.
A spray of perfume diffusing in a room is a spontaneous process because gas particles have higher entropy when they are spread evenly around the room.
Answers
Answer:
A spray of perfume diffusing in a room is a spontaneous process because gas particles have higher entropy when they are spread evenly around the room.
This is true because entropy increase when gas particles spread
Explanation:
Suzy steps on the scale and measures her weight to be 125 lbs. How much
does she weigh in kg?
Select one:
O a 125 kg
O b. 0.0176 kg
O c.56.8 kg
O d. 275 kg
Answers
Answer:
125 lbs would round to C. 56.8kg
What ions are present in MgCO3????? Help again !! Asapppppp
Answers
Answer:
magnesium salt, a carbonate salt and a one-carbon compound
Explanation:
