Answer: 8.59 L of oxygen gas are needed to produce 100 kJ of energy at STP
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
Standard condition of temperature (STP) is 273 K and atmospheric pressure is 1 atmosphere respectively.
1 mole of every gas occupy volume at STP = 22.4 L
The balanced chemical reaction is:
[tex]2C_6H_6(I)+15O_2(g)\rightarrow 12CO_2(g)+6H_2O(g)[/tex]
3909.9 kJ of of energy is produced by = [tex]15\times 22.4=336L[/tex]
100 kJ of oxygen gas are needed to produce = [tex]\frac{336}{3909.9}\times 100=8.59L[/tex]
The Earth’s inner core is made mostly of ____.
A) magma
B) halite
C) iron
D) diamond
Answer:
iron and nickel
______________
2) If I have an unknown quantity (# of moles) of gas at a pressure of 32 atm, a volume of 70 L, and a temperature of 25˚C. How many moles of gas are in the sample?
Answer:
91.5 mol
Explanation:
Volume of gas = 70 L
Temperature = 25°C
Pressure = 32 atm
Moles of gas = ?
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
Now we will convert the temperature.
25+273.15 = 298.15 K
By putting values,
32 atm × 70 L = n ×0.0821 atm.L /mol.K × 298.15 K
2240 atm.L = n ×24.48 atm.L /mol
n = 2240 atm.L / 24.48 atm.L /mol
n = 91.5 mol
The Earth’s orbit _____.
causes day and night
is a circle
is an ellipse
goes around the moon
Answer:
The Earth's orbit is an ellipse.
Explanation:
The Earth's orbit is not a perfect circle. It is elliptical, or slightly oval-shaped.
Earth's Rotation causes day and night.
The Moon goes around Earth. The Earth goes around the sun.
Megan let her wagon outside what was raining and filled with water. When Megan tried to move the wagon that afternoon, she failed to budge the wagon. Why did Megan's wagon become hard to move?
Answer:
The rain filled the wagon with water meaning it gave the wagon more weight which made it hard to move.
Which part of the mantle is still a solid but flows like a thick, heavy liquid?
-lithosphere
-asthenosphere
-core
-crust
i will give brainest
Answer:
Asthenosphere
Explanation:
The asthenosphere is the hot, weak, inner part of the upper mantle. Although it is solid, it can flow like a thick, heavy liquid.
What are the disadvantages of using nonrenewable energy resources?
They are readily available.
They are harmful to the environment.
There is only a certain amount of each source.
They are easy to extract from the earth.
What is the best definition of solar radiation?Storing Storing of of energy energy in in Earth'Earth's s oceansoceansEnergy Energy from from the the Sun Sun that that reaches reaches EarthEarthMoisture Moisture and and heat heat energy energy in in the the atmosphereatmosphereIncreased Increased evaporation evaporation due due to to warm warm waterwater
Answer:The solar energy that we receive through solar radiation is directly or indirectly responsible for aspects as important to life as: Photosynthesis in plants; maintaining a planet temperature compatible with life. of the wind. The solar energy that reaches the earth's surface is 10,000 times greater than the energy currently consumed by all
Explanation:
What is the electron configuration for Fe?
A. [He] 4s2 3d6
B. [Ne] 4s2 3d6
C. [Ar] 4s2 3d6
D. [Ar] 4s2 4d6
PLEASE HELP!!!
The following reaction takes place in an acidic solution.
Mno4- (aq) + Cl- (aq) → Mn2+ + Cl2 (g) (unbalanced)
Write the reduction and oxidation half-reactions (without electrons).
2MnO4-(aq) + 16H+ + 10Cl-(aq) ⇔ 2Mn2+(aq) + 8H2O + 5Cl2 (g)
Further explanationGiven
Reaction(unbalanced)
Mno4- (aq) + Cl- (aq) → Mn2+ + Cl2 (g)
Required
Half reaction
Solution
1. Add coefficient(equalizing atoms in reaction)
2. Adding H₂O on the O-deficient side.
3. Adding H⁺ on the H-deficient side.
4. Adding e⁻
5. Equalizing the number of electrons and sum the all the half-reaction
1.MnO₄⁻(aq) = Mn²⁺(aq) reduction
2.MnO4(aq) = Mn2+(aq) + 4H2O
3. MnO4-(aq) + 8H+ = Mn2+(aq) + 4H2O
4. MnO4-(aq) + 8H+ + 5e- = Mn2+(aq) + 4H2O
Cl⁻(aq) = Cl₂(g) oxidation
1. 2Cl-(aq) = Cl2 (g)
2-3 none
4. 2Cl-(aq) = Cl2 (g) + 2e-
5.
MnO4-(aq) + 8H+ + 5e- = Mn2+(aq) + 4H2O x2
2Cl-(aq) = Cl2 (g) + 2e- x5
2MnO4-(aq) + 16H+ + 10e- = 2Mn2+(aq) + 8H2O
10Cl-(aq) = 5Cl2 (g) + 10e-
2MnO4-(aq) + 16H+ + 10Cl-(aq) ⇔ 2Mn2+(aq) + 8H2O + 5Cl2 (g)
Convert the following word equations into formula equations by changing element and compound names into chemical formulas.
1. sodium + oxygen → sodium oxide
2. copper + silver nitrate → copper(II) nitrate + silver
3. aluminum chlorate + barium sulfate → aluminum sulfate + barium chlorate
4. bromine + calcium iodide → calcium bromide + iodine
5. zinc sulfide + magnesium arsenate → zinc arsenate + magnesium sulfide
6. cobalt + lead(II) nitrite → cobalt(III) nitrite + lead
7. potassium + water → potassium hydroxide + hydrogen
Answer:
Na + O.2 = NaO.2 whereas Cu + AgNo3 = Cu.2No.3 +AG
The given reactions can be converted to equations as follows:
1. 2 Na + O2 → 2 Na2O
2. Cu + 2 AgNO3 → Cu(NO3)2 + 2 Ag
What is a balanced chemical equation ?A balanced chemical equation is a representation of a chemical reaction using chemical formulas of reactants and products. It shows the number of atoms of each element on both the reactant and product sides of the equation.
The equation is balanced when the number of atoms of each element is the same on both sides of the equation.
The given reactions can be written as balanced equations as follows:
2 Na + O₂ → 2 Na₂O2. Cu + 2 AgNO₃ → Cu(NO₃)₂ + 2 Ag2 Al(ClO₃)₃ + 3 BaSO4 → Al2(SO₄)₃ + 3 Ba(ClO₃)₂Br₂ + CaI₂ → CaBr₂ + I₂ZnS + Mg₃(AsO₄)2 → Zn₃(AsO₄)₂ + 3 MgSCo + 2 Pb(NO₂)₂ → Co(NO₂)₂ + 2 Pb2 K + 2 H₂O → 2 KOH + H₂Find more on balanced chemical equations :
https://brainly.com/question/30702275
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The soluble bases are called alkalis. *
true or false
Answer:
True
Explanation:
Those bases which are soluble in water are called alkalis
The diagram shows the movement of magma due to
convection currents.
Based on the diagram, which
part of Earth is the
coolest?
A) the crust
Crust
B) the mantle
the outer core
Mantle
C) Outer core
D) the inner core
Inner core
Answer:
A) The crust
hope this helps :)
Explanation:
Answer:
The coolest part in the diagram shown is A.) The Crust
Explanation:
This is because as more and more layers form, they soon harden because they are further away from the heat force, which would be the core.
Hope this helps. Sorry if I am wrong. ;-;
what mechanical weathering process is used when water turns to ice?
Answer:
frost wedging
Explanation:
Frost wedging is the process by which water seeps into cracks in a rock, expands on freezing, and thus enlarges the cracks. The effectiveness of frost wedging is related to the frequency of freezing and thawing.
I wish this helps you
Chemists once believed that an atom was made of negative electrons dispersed inside a positive mass like raisins in pudding. An experiment with radiation and gold foil demonstrated that most of an atom was
made of empty space. After this experiment, they adopted a new model of the atom that showed the electrons orbiting the nucleus of the atom from a distance. Which of the following statements about the new
model is true?
The new model is perfect and will not change.
The new model is a wrong model and will not last.
The new model fits the data worse than the old model.
The new model fits the data better than the old model.
the new model fits the data better than the old model
The true statement about the new model is the new model fits the data better than the old model. The correct option is b.
What is Rutherford’s gold foil experiment?In Rutherford's gold foil experiment, he discovered that most particles passed through the gold foil, some were distributed in other directions, and very few were redirected back toward the source.
Because all the particles would pass through without being deflected if there was a symmetrical distribution of charges, this experiment proves that the plum pudding model was erroneous.
Rutherford’s gold foil experiment demonstrated how tightly packed the positive charge is within the atom. This was a better experiment.
Thus, the correct option is b. The new model fits the data better than the old model.
To learn more about Rutherford’s gold foil experiment, refer to the below link:
https://brainly.com/question/13475490
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Can anything change solutions? Be
specific!
3. A solution that can hold more solute is called
Answer:
A solution that can hold more solute is called. saturated.What is the movement of matter due to density differences called?
A a convection current
B a pressure belt
C a climate cycle
D an ocean current
Answer:
A convention current.
Explanation:
what is the smallest atomic radius
Answer:
Helium
Explanation:
Helium has the smallest atomic radius. This is due to trends in the periodic table, and the effective nuclear charge that holds the valence electrons close to the nucleus.
A rectangle has a volume of 395cm3. It has a mass of 147g. What is its density? *
The density of a rectangle : ρ = 0.372 g/cm³
Further explanationGiven
The volume of rectangle : 395 cm³
Mass : 147 g
Required
The density
Solution
Density is a quantity derived from the mass and volume
Density is the ratio of mass per unit volume
Density formula:
[tex]\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}[/tex]
ρ = density
m = mass
v = volume
Input the value :
ρ = 147 g : 395 cm³
ρ = 0.372 g/cm³
The crack shown in the lithosphere was created by the movement of two or more tectonic plates. What is this crack called
Answer:
The lithosphere is made up of pieces of tectonic plates. These plates are constantly changing and move towards the mantle. Non-stop movement of tectonic plates causes stress on the earth's outermost layer i.e,the crust. When these stresses extends it leads to cause cracks called faults.
Explanation:
In an unexpected temperature change,
what causes the temperature change?
Answer:
WEATHER!
Explanation:
Weather can cause an unexpected temperature change! :) Hope this helps!
Compare heat and thermal energy. Correct answers please. Or I’ll report you(:
What is CO??????????
4. Which type of bond will form between a calcium atom and a sulfur atom?
Answer:ionic
Explanation: ionic bond formation
In the ionic bond formation between calcium and sulfur, a calcium atom donates two valence electrons to a sulfur atom to form a Ca2+ ion and an S2+ ⁻ ion.
Question 1
What causes a thermocline?
a decline in the amount of nutrients available
a difference in water temperature
the absence of plankton
nutrients too heavy to rise to the surface
Question 2
Which organism is a kind of phytoplankton?
algae
sea butterfly
copepod
lion’s mane jellyfish
please help!! and try and answer them all, not just one!
Answer:
1) The Difference in water tempture
2) Algae
Explanation:
Have a good day! ∩__∩
Answer:
question 1. thermocline is caused by a difference in water temperature.
question 2. a kind of phytoplankton is algae
calculate the quantity of electricity obtained from 2 moles of electrons
The quantity of electricity : 2 Faraday = 193000 Coulomb
Further explanationGiven
2 moles of electrons
Required
The quantity of electricity
Solution
According to Faraday, the amount of current flowing in the electrolysis cell is closely related to the amount of substance that reacts
1 Faraday is the amount of electricity that is passed in the electrolysis cell to obtain 1 mole of electrons. 1 mole of electrons is equivalent to an electric charge of 96500 Coulombs.
The conversion / relationship can be stated as follows:
1 Faraday = 1 mole of electrons = 96500 Coulombs
1 faraday = coulomb / 96500
Can be formulated
Coulomb = Q = I. t so:
[tex]\large {\boxed {\bold {1 \: Faraday \: = \: \dfrac {i \: x \: t} {96500}}}}[/tex]
so for 2 moles electrons :
= 2 x 96500 C
= 193000 C
= 2 Faraday
PLEASE HELP QUICK!
1.) SnO2 (s) + 2 H2 (g) → Sn (s) + 2 H2O (l)
What mass of water is produce when 79.0g of SnO2 are consumed in the reaction above?
2.) C3H8(g) + 5 O2 (g) → 3 CO2 (g)+ 4 H2O (g)
What volume of oxygen is required to completely combust 0.499L of propane (C3H8) at STP?
BRAINLIEST FOR GOOD ANSWERS TO BOTH.
Answer:
1) Mass = 18.864 g
2) V = 2.47 L
Explanation:
1) Given data:
Mass of water produced = ?
Mass of SnO₂ react = 79.0 g
Solution:
SnO₂ + 2H₂ → Sn + 2H₂O
Number of moles of SnO₂:
Number of moles = mass/molar mass
Number of moles = 79.0 g/ 150.71 g/mol
Number of moles = 0.524mol
Now we will compare the moles of SnO₂ and H₂O
SnO₂ : H₂O
1 : 2
0.524 : 2/1×0.524 =1.048 mol
Mass of water:
Mass = number of moles × molar mass
Mass = 1.048 mol × 18 g/mol
Mass = 18.864 g
2) Given data:
Volume of oxygen required = ?
Volume of C₃H₈ combust at STP = 0.499 L
Solution:
Chemical equation:
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
Number of moles of C₃H₈:
PV = nRT
R = general gas constant = 0.0821 atm.L /mol.K
1 atm × 0.499 L = n × 0.0821 atm.L /mol.K × 273.15 K
0.499 L atm.L = n × 22.43 atm.L /mol
n = 0.499 L atm.L / 22.43 atm.L /mol
n = 0.022 mol
Now we will compare the moles of propane and oxygen.
C₃H₈ : O₂
1 : 5
0.022 : 5/1×0.022 = 0.11 mol
Volume of oxygen required:
PV = nRT
R = general gas constant = 0.0821 atm.L /mol.K
1 atm × V = 0.11 mol × 0.0821 atm.L /mol.K × 273.15 K
1 atm × V = 2.47 atm.L
V = 2.47 atm.L / 1 atm
V = 2.47 L
BRAINLIEST!! PLZ HELP
Answer:
1.0 is Answer
Explanation:
May be this is helpful!
A_______ contains specific instructions for making proteins
A- CHROMOSOMES
B- GENE
C- MOLECULES
D- RIBOSOMES
Answer:
D Ribosomes
Explanation:
Answer:
D. Ribosomes
What is CO2?????????
Answer: carbon dioxide
Explanation: because it is 1 carbon and 2 oxygen, and two means di-.
