Taking into account the definition of dilution, the molarity of the unknown solution is 0.133 M.
DilutionDilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.
In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.
A dilution is mathematically expressed as:
Ci×Vi = Cf×Vf
where
Ci: initial concentrationVi: initial volumeCf: final concentrationVf: final volumeInitial concentrationIn this case, you know:
Ci= ?Vi= 10.5 mLCf= 0.172 MVf= 80 mLReplacing in the definition of dilution:
Ci× 10.5 mL= 0.172 M× 80 mL
Solving:
Ci= (0.172 M× 80 mL)÷ 10.5 M
Ci= 0.133 M
In summary, the molarity of the unknown solution is 0.133 M.
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A sample of gas collected at 685 mm Hg occupies 131 mL. At constant temperature, what pressure does the gas exert if the volume increases to 478 mL? a. 188 b. 1320 c. 128 d. -88.8
Answer:
a. P=188mmHg
Explanation:
A gas undergoing a change of volume and pressure at constant temperature (and not changing the number of molecules), follows Boyle's Law: [tex]P_1V_1=P_2V_2[/tex]
The units of these quantities can be any measure of pressure and volume, so long as long as the units are the same between beginning and ending conditions.
Substitute and solve:
[tex]P_1V_1=P_2V_2[/tex]
[tex](685[mmHg])(131[mL])=P_2(478[mL])[/tex]
[tex]\dfrac{(685[mmHg])(131[mL\!\!\!\!\!\!\!\!\!{--}])}{478[mL\!\!\!\!\!\!\!\!\!{--}]}=\dfrac{P_2(478[mL]\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{----})}{478[mL] \!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{----}}[/tex]
[tex]187.730125523[mmHg]=P_2[/tex]
Accounting for significant figures, [tex]P_2=188[mmHg][/tex]
a burning candle wax reacts with oxygen. after a glass jar is placed over it, the candle goes out. what is the limiting reactant?
Answer:
The Oxygen
Explanation:
When fire is covered, it goes out due to the lack of oxygen to maintain itself.
The limiting reactant in the experiment of the burning candle is oxygen.
What is a limiting reactant?A limiting reactant is a reactant which determines the amount of product that ca be formed in a given reaction.
The limiting reactant is always used up in a reaction, after which the reaction stops.
In the experiment of the burning candle, covering the candle with the glass prevents more oxygen from taking part in the reaction.
Therefore, the limiting reactant is oxygen.
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Help please help! Please help..
How many moles of propane
react when 294 g of CO2 form?
C3H8 +502 → 3CO₂ + 4H₂O
2.23 moles of propane react when 294 g of CO₂ is formed .
What is moles ?Moles is a unit which is equal to the molar mass of an element.
A reaction is given
C₃H₈ +50₂ → 3CO₂ + 4H₂O
Grams of CO₂ formed = 294 gm
In moles = 294 /44 = 6.68 moles.
Let x be the moles of C₃H₈ is x
Mole ratio of CO₂ to C₃H₈ = 3 : 1
so
6.68 /x = 3/1
x = 6.68 /3 = 2.23 moles
Therefore 2.23 moles of propane react when 294 g of CO₂ is formed .
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If the pH of a solution is 4.7, what is the H+ concentration?
Answer:
0.000019952mol/dm3
Explanation:
pH=-log(H+)
4.7= -log(H+)
log(H+)=-4.7
(H+)=10*-4.7=0.000019952
plssssssssssssssssssssss helppppppppppppppppppppppppppppppppppppp
Answer:
protons and neutrons have different charges but they have approximately the same mass
How many moles of sulfur are in 80 grams of sulfur?
A. 1.5 moles
B. 2.5 moles
C. 1 mole
D. 2 moles
Answer:
2.5 moles
Explanation:
Number of moles = MassMolar mass
= 80⋅g32.06⋅g⋅mol−1 = ??mol
Note that sulfur likely exists in its elemental state as S8. I am perfectly justified in treating sulfur as S. The number of sulfur atoms is the same in each case.
When in contact with hydrochloric acid, which mineral gives off bubbles of carbon dioxide gas?.
Answer:
Calcite
Explanation:
When in contact with hydrochloric acid, calcite releases carbon dioxide gas.
What is the major different between the particles in a liquid and a gas of the same substance at the same temperature?
a. The particles in the gas are moving faster than the particles in the liquid
b. The particles in a liquid are still connected, but the particles in a gas have separated from each other and now fly around to fill the container
c. The particles in the liquid have higher masses than the particles in the gas
d. The particles the gas are separated, so they absorb less heat than normal, which is why gases are typically cooler than liquids
Answer: a. The particles in the gas are moving faster than the particles in the liquid
In a chemical reaction occurring in an open beaker, the reactants have a mass of 10.0 g and contain 1000 J of energy. The products in the beaker contain a mass of 5.0 g and 500 J of energy. Which best explains the difference in energy and mass as reactants are converted to products?
kinetic energy
closed systems
law of conservation of energy
electromagnetic energy
This happens because the beaker is open.
The Law of Mass Conservation says that in a close system all the mass and energy should be the same.
If the system is open, as in the case, we can have loss of mass, due to formation of gas, that will leave the beaker to the environment, and we can also have loss of energy, because the system will exchange the energy, as heat, with the environment, causing a loss on the total energy.
Answer:
Its C its C its C
Explanation:
i dislike expert verifeid beacause he wont say C
How do H3O+ and OH relate to acids, bases and the pH scale?
Answer: An acid is defined with having more [H₃O+] ions, and a base is defined with having more [OH-] ions. On the pH scale, an acid has a lower pH and a base has a higher pH. With this being said, the lower the pH, the more [H₃O+] ions are present and the higher the pH, the more [OH-] ions are present.
Explanation:
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In the nebular hypothesis, why did the nebula start to collapse?
Answer:
Because of gravity and as a result, created planets and stars.
(Likely by a nearby supernova shockwave also)
What is a step by step explanation of the nebular hypothesis?Although I'm not an expert, I seem to recall reading that solar systems often begin with clouds of unorganized matter measuring 20 parsecs (65 light years) across. Most of them are hydrogen molecules. The pressure required to hold the molecules together increases with temperature, but because the typical temperature is around 12 k, the pressure is negligible. It originates from the gravity of the cloud itself. Material from novas, colliding neutron stars, and high-speed material jets emerging from stars and black holes all contribute to the continuous enrichment of such clouds. That adds those heavy elements—like gold—that can only be produced by the rapid neutron capture (rNC) process as opposed to the simple nuclear fusion process (slow neutron capture). These clouds spontaneously emerge from floating pieces of material, hold together for millions of years, and eventually disperse. A component of the cloud condenses along the route for a variety of causes, including localized concentrations of greater density or shock waves from supernovae. Unbalances in the cloud lead it to split up when condensation takes place. Then those fragments shatter once again, leaving you with barely enough for a solar system. It would have been within 3.5 light years of the initial cloud for our galaxy. The contraction up to this point has been isothermal, which means that heat is being radiated so quickly that temperature stays mostly unchanged. The creation of a Bonnor-Ebert sphere comes next. Although such zones frequently appear in photographs in a faint manner, this is only a hypothetical area in which there is a certain amount of mass. The First Hydrostatic Core is located here (FHSC or First Core). The First Core can be imagined as a pre-proto Sun with an interior temperature of roughly 300 k and a radius of 1 AU (the same as the Earth's orbit) (26.85 C or 80.33 F). Although it first begins off chilly, it ultimately warms up to 300 k and then grows even hotter over the course of years. The friction of falling materials and adiabatic contraction provide the heat (the kind that makes things hotter). Hydrogen molecules start to break down into atomic hydrogen, which is more dense and falls to the center, at temperatures between 1500 k and 2000 k, on average. Eventually, the atomic hydrogen coalesces into a protostar-sized Second Core. Because the entire system is rotating swiftly and because momentum is being lost in some areas owing to gas shooting off, an accretion disk has already formed. Although in our instance it would have also been a protoplanetary disk, the disk is a protostellar disk. The protostar is regarded as a star until it becomes hot and brilliant enough to begin ejecting the gas and dust. (Prior to it, infalling gas and dust are still adding mass to the protostar.)
In the nebular hypothesis, the collapse of the nebula is believed to have been triggered by a disturbance or shock wave, such as a nearby supernova explosion or the gravitational influence of a passing star or gas cloud.
This disturbance caused the nebula, which was a large and diffuse cloud of gas and dust in space, to start collapsing under the force of its own gravity. As the nebula contracted, its particles came closer together, and the conservation of angular momentum caused it to spin faster.
The collapse and spin eventually led to the formation of a rotating protostellar disk at the center, which eventually evolved into a young star, while the surrounding material formed planets and other celestial bodies through accretion and gravitational attraction.
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On a heating curve, in which section(s) would you use the equation, Q=mCΔT, to calculate the total heat required?
only on plateaus or flat parts of the curve
on a sloped part only if under 0oC
on a sloped part only if over 100oC
on all sloped parts of the curve
Answer:
all sloped parts
Explanation:
Sloped part of the curve - all as this would show a change in T ( or delta T)
the flat parts would involve no change in Temp
Please Answer!!!!
Which equation is balanced?
A) H₂+ O2 → H₂O + O2
B) 4H2₂+ O2 → H₂O + O
C) 2H₂ + O2 → 2H₂O
D) H₂ + O2 → H₂O
Option C is the correct answer
2H₂ + O2 → 2H₂OIn LHSNo. of hydrogen atoms is 4No. of oxygen atoms is 2In RHS No. of hydrogen atoms is 4No. of oxygen atoms is 2Hence , LHS = RHS
A balanced equation obey the law of conservation of mass. According to this law mass can neither be created nor be destroyed. Among the given options, the balanced equation is 2H₂ + O₂ → 2H₂O. The correct option is C.
What is a balanced equation?A chemical equation in which the number of atoms of reactants and products are equal on both sides of the equation is defined as the balanced chemical equation. The numbers which are used to balance the equation are called the coefficients.
The coefficients are generally placed in front of the formulas. The substances on the left hand side are called the reactants and the substances on the right hand side are called the products.
Here the balanced equation is:
2H₂ + O₂ → 2H₂O
The number of 'H' and 'O' atoms are equal on both sides.
Thus the correct option is C.
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The diagram represents the general equation for photosynthesis.
What does the X represent?
hydrogen
oxygen
glucose
carbon dioxide
Answer:
The diagram represents the general equation for photosynthesis.
What does the X represent?
Explanation:
Carbon dioxide
Perform the following calculations and report each answer with the correct number of significant figures.
62.1 x 37
Answer:
19-73 19-73 70-65-46 71-76-63 25-46-79
Which type of chemical bonding involves a transfer of electrons?
Answer:
ionic bond
Explanation:
Answer:
Ionic bonding
Explanation:
Salt Na+Cl- is an example
The main component of smog is NO2(g). Smog is a product that is formed through the following series of intermediate chemical reactions.
Answer:
D
Explanation:
bc im smart
calculate mole fraction of benzene (70 g) having 30 gram of mass of carbon tetrahedral
Moles of benzene
70/90=7/9=0.8molmoles of CCl_4
30/1540.2molNow
[tex]\\ \rm\Rrightarrow \chi_{C_6H_6}[/tex]
[tex]\\ \rm\Rrightarrow \dfrac{\chi_{C_6H_6}}{\chi_{sol^n}}[/tex]
[tex]\\ \rm\Rrightarrow \dfrac{0.8}{0.8+0.2}[/tex]
[tex]\\ \rm\Rrightarrow \dfrac{0.8}{1}[/tex]
[tex]\\ \rm\Rrightarrow 0.8[/tex]
How many moles of h+ ions are present in 2.8 l of 0.25 m hydrobromic acid solution?
0.7 mol of H⁺ ions are present in 2.8 l of 0.25 m hydrobromic acid solution.
Hydrobromic acid is a strong acid, we can assume that all acid molecules dissociate completely to yield H+ ions and dissociated anion.
The equation for the dissociation of HBr :Hbr (s) → H⁺ (aq) + Br⁻ (aq)
moles H⁺ = ([tex]2800ml[/tex]) ( [tex]\frac{1L}{1000ML}[/tex]) ([tex]\frac{0.25 mol Hbr}{L}[/tex]) ( [tex]\frac{1 mol H}{1 mol Hbr}[/tex])
= 0.7 mol
Therefore, 0.7 mol of H⁺ ions is present.
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One of the postulates of bohr's atomic model of a moving electron is that angular momentum of a moving electron is quantized. Explain its meaning and calculate the angular momentum of third orbit (i.e n=3)
The angular momentum of an electron in the third Bohr orbit of a hydrogen atom is given by mvr=3h÷2π
What is momentum?Momentum is defined as the amount of motion occurring in something that is moving, or the force that drives something forward to keep it moving.
Bohr never assumed stable electronic orbits with the electronic angular momentum quantized as
l=mvr = [tex]\frac{nh}{2pi}[/tex]
Quantization of angular momentum means that the radius of the orbit and the energy will be quantized as well.
Bohr assumed that the discrete lines seen in the spectrum of the hydrogen atom were due to transitions of an electron from one allowed orbit/energy to another.
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A 25.0 g sample of metal is
warmed by 6.1 °C using 1259 ] of
energy.
What is the specific heat of the
metal?
Answer:
Below
Explanation:
Units of specific heat are J / (g- °C)
so to get these units :
1259 J / (25 g *6.1 °C) = 8.26 J / (g °C)
The valence electrons found in metallic bonds are different from other bonds
because
A. their valance electrons are free-roaming
B.they allow conductivity of electricity
C.their valence electrons are immobile
D. They’re able to share electrons with other atoms
Answer:
their valence electrons are free roaming
Substances are classified as acidic, basic, or neutral. The pH scale can be used to classify a substance. Which feature suggests that a substance is basic?
a. The pH is greater than 7.
b. The pH is 0.
c. The pH is 7.
d. The pH is less than 7.
Answer:
a
Explanation:
from pH of 0-6 is acidic and 7 is neutral above 7 is basic or alkali
3. Why did the solution change from blue to yellow (what chemical reaction happened)?
Answer:
it was more acidic
Explanation:
changing the pH of the solution and making it more acidic results in the color of the solution changing it from blue to yellow
solution is Bromothymol blue
in a ph below 6 it turns yellow because
a ph below 6 is acidic
a ph above 7.6 its blue because
a ph above 7.6 is basic
Bromothymol blue is made in a basic solution, so it starts out as blue, thus the name 'blue'. It changes to yellow in acidic conditions
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during chemical reactions do atoms get destroyed?
No. Atoms do not get destroyed during reactions.
Law of conservation of matterAccording to the law of conservation of matter, matters can not be created nor destroyed in any way. Be it during reactions or otherwise.
However, matters can be converted from one form to another during reactions.
Atoms are a form of matter, and thus, cannot be destroyed during reactions.
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what is chemical energy
Answer:
chemical energy is the energy of a chemical substance that is stored in the bonds of chemical compounds and is released when they undergo a chemical reaction and transform into another substance
N₂(g) + 3H₂(g) → 2NH3(g)
224 L of nitrogen reacts with
excess hydrogen at 2773 K and
95.0 atm. How many moles of
nitrogen react?
Answer:
93.5 moles N₂
Explanation:
To find the moles, you need to use the Ideal Gas Law. The equation looks like this:
PV = nRT
In this equation,
-----> P = pressure (atm)
-----> V = volume (L)
-----> n = number of moles
-----> R = constant (0.0821 atm*L/mol*K)
-----> T = temperature (K)
You can plug the given values into the equation and simplify to find moles. The final answer should have 3 sig figs to match the lowest number of sig figs among the given values.
P = 95.0 atm R = 0.0821 atm*L/mol*K
V = 224 L T = 2773 K
n = ?
PV = nRT
(95.0 atm)(224 L) = n(0.0821 atm*L/mol*K)(2773 K)
21280 = n(227.6633)
93.5 = n
Answer:
93.5 moles N₂
Explanation:
You can plug the given values into the equation and simplify to find moles. The final answer should have 3 sig figs to match the lowest number of sig figs among the given values.
P = 95.0 atm R = 0.0821 atm*L/mol*K
V = 224 L T = 2773 K
n = ?
PV = nRT
(95.0 atm)(224 L) = n(0.0821 atm*L/mol*K)(2773 K)
21280 = n(227.6633)
93.5 = n
Explanation:
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Outline the differences between respiration and combustion.
Respiration is the process of oxidation of food materials like glucose, Amino acids, fatty acids to water and carbon dioxide. Respiration does not require any external heat to carry on the process. Combustion is only done by applying external heat to the sugar molecule to burn.
A piece of lithium is added to a beaker of water. Will the solution formed be acidic, alkaline or neutral?
Answer:
alkaline
Explanation:
Lithium reacts intensely with water, forming lithium hydroxide and highly flammable hydrogen. The colorless solution is highly alkalic.
According to the chemical reaction between lithium and water, lithium hydroxide is formed which is a basic substance.
What are chemical reactions?Chemical reactions are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.
There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical reactions:
1) inorganic reactions
2)organic reactions
3) biochemical reactions
During chemical reactions atoms are rearranged and changes are accompanied by an energy change as new substances are formed.
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