The vapour pressure in the water flask is 23.686 torr.
The pressure of [tex]H_2[/tex] in the flask was 713.514 torr.
Pressure is the [tex]H_2[/tex] exerting in the flask is 688.314 torr
What is vapour pressure?Vapour pressure is a measure of the tendency of a material to change into the gaseous or vapour state, and it increases with temperature.
a.The vapour pressure of water is given by:
[tex]Log_{10} P =A- \frac{B}{C+T}[/tex], where T is in degree Celcius, P is in torr.
For 0-100 degree celcius, A=8.07131, B=1730.63, C=233.426
[tex]Log_{10} P = 8.07131 - \frac{1730.63}{233.426+25} =1.3745[/tex]
As T =25 degree celcius
[tex]P = 10^{1.3745} torr[/tex] =23.686 torr
b.We know that [tex]P_{total} =P_{H_2} + P_{H_2O}[/tex]
[tex]P_{total}[/tex] = Atmospheric pressure
[tex]737.2 torr = P_{H_2} +23.686 torr[/tex]
[tex]P_{H_2} = 713.514 torr[/tex]
c.After there is a leak in the gas collection tube, the amount at pressure due to water vapour remains unchanged as it is a quantity dependent on temperature.
[tex]P_{total} =P_{H_2} + P_{H_2O} + P_{leaking \;air}[/tex]
[tex]737.2 torr = P_{H_2} + 23.686 torr + 25.2 torr[/tex]
[tex]P_{H_2} =688.314 torr[/tex]
For calculating molar mass of any gas:
M= Density X (RT ÷ P)
M= 0.714 g X ([tex]8.314 J mol^{-1}K^{-1}[/tex]273 K ÷ 101325 Pa)
M= 15.994 g/mol = 16 g/mol.
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The table below shows the electronegativity values of various elements on the periodic table.
Electronegativities
1
2
15 16 17
24
3A 4A 5A 6A 7A
Li Be
8
F
1.0 1.5
2.0 2.5 3.0 3.5 4.0
Na Mg
P
0.9 1.2
1.5 1.8 2.1 2.5 3.0
K
Ca
Ge As Se Br
1.8 2.0 2.4 2.8
0.8 1.0
Rb Sr
2.5
0.8 1.0
Cs Ba
0.7 0.9
Which pair of elements would form an ionic bond?
O carbon (C) and oxygen (0)
H
2.1
a
ON
00
O
An ionic bond can be formed between Na and O, Mg and F or Li and H since they have large differences in their electronegativity values.
What are ionic bonds?Ionic bonds are the bonds present in ionic compounds.
Ionic bonds are formed due to the electrostatic forces of attraction that exist between oppositely-charged ions.
Ionic bonds are formed between elements whose electronegativity values are far apart.
Thus, based on the given electronegativity values, an ionic bond can be formed between Na and O, Mg and F or Li and H.
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An ionic bond can be formed between Na and O, Mg and F or Li and H since they have large differences in their electronegativity values.
What are ionic bonds?Ionic bond, also called an electrovalent bond, type of linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound.
Metal atoms form positive ions, while non-metal atoms form negative ions. The strong electrostatic forces of attraction between oppositely charged ions are called ionic bonds.
Ionic bonds are formed between elements whose electronegativity values are far apart.
Thus, based on the given electronegativity values, an ionic bond can be formed between Na and O, Mg and F or Li and H.
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If air was not allowed to stream
through the kiln, how would the
production of lime be affected?
Explain your answer.
Answer:
The air flow carries away the carbon dioxide formed during the decomposition. Once accumulated in the furnace or if the air was not allowed to stream through, it begins to react again with the newly formed calcium oxide, equilibrating rather than completing the reaction.
Question 10 of 10
Why are railroad tracks built with a flexible expansion and contraction joint?
OA. The tracks have a larger coefficient of linear expansion than the
ground beneath.
B. The two have equal coefficients of linear expansion.
C. The ground beneath has a larger coefficient of linear expansion
than the tracks.
OD. The tracks have a smaller coefficient of linear expansion than the
ground beneath.
Railroad tracks built with a flexible expansion and contraction joint because the tracks have a larger coefficient of linear expansion than the ground beneath. Hence, Correct opotion is option (A)
Where is linear expansion used?The linear expansion of a solid under a change in temperature can be measured using Δℓ/ℓ = αΔT and has applications in the ways solids expand and contract in everyday life.
The strain that the object undergoes has implications in engineering when fitting objects among each other.
Hence, Railroad tracks built with a flexible expansion and contraction joint because the tracks have a larger coefficient of linear expansion than the ground beneath. Therefore, Correct opotion is option (A)
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The pressure of a sample of helium is 1.556 atm in a 268.5 mL container. If the container is compressed to 112.4 mL without changing the temperature, what is the new pressure?
a. 3.72
b. 0.651
c. 1.94e4
d. 277
Answer:
a. 3.72 [atm]
Explanation:
For a gas at constant temperature, (with no change in number of molecules of the gas), we can apply Boyle's Law: [tex]P_1V_1=P_2V_2[/tex]
[tex](1.556[atm])(268.5[mL])=P_2(112.4[mL])[/tex]
[tex]\dfrac{(1.556[atm])(268.5[mL\!\!\!\!\!\!\!\!{--}])}{112.4[mL \!\!\!\!\!\!\!\!{--}]}=\dfrac{P_2(112.4[mL]\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{-----})}{112.4[mL]\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{-----}}[/tex]
[tex]3.716957[atm]=P_2[/tex]
It seems like the answer should have 4 significant figures since all of the other quantities have 4 significant figures, but the closest answer choice of those provided is a. 3.72
justify the statement nuclear energy is harmful as well as useful
a sample of helium gas has a volume of 1.00 l. what is the final volume if both the pressure and kelvin temperature each double?
If the both pressure and temperature of the helium gas is doubled, the final volume is 1.00 Liters.
What is the final volume of the helium gas?Combined gas law put together both Boyle's Law, Charles's Law, and Gay-Lussac's Law. It states that "the ratio of the product of volume and pressure and the absolute temperature of a gas is equal to a constant.
It is expressed as;
P₁V₁/T₁ = P₂V₂/T₂
Given that;
Initial volume V₁ = 1.00LInitial Pressure = PInitial temperature = TFinal pressure = 2PFinal temperature = 2TFinal volume V₂ = ?P₁V₁/T₁ = P₂V₂/T₂
P₁V₁T₂ = P₂V₂T₁
V₂ = P₁V₁T₂ / P₂T₁
V₂ = ( P × 1.00L × 2T ) / ( 2P × T )
V₂ = ( 2.00L × P × T ) / ( 2 × P × T )
V₂ = ( 1.00L × P × T ) / ( × P × T )
V₂ = 1.00L
If the both pressure and temperature of the helium gas is doubled, the final volume is 1.00 Liters.
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what is formed when mixing a weak acid and strong base
Explanation:
when a weak acid and a strong based are mixed they react the pH can be determined by consider ing the equilibrium
if the same amount of heat is added to 50.0 g samples of each of the metals, which are all at the same temperature, which metal will reach the highest temperature?
The metal which will reach the highest temperature is the metal with the lowest specific heat capacity.
What is the amount of heat added to each metal?The amount of heat Q = mcΔT where
m = mass of metalc = specific heat capacity of mateal and ΔT = temperature changeTemperature change of the metalMaking ΔT subject of the formula, we have
ΔT = Q/mc
Given that Q and m are the same for each metal,
ΔT ∝ 1/c
We see that the temperature change is inversely proportional to the specific heat capacity.
Since the metals are at the same temperature, the metal which will reach the highest temperature is the metal with the lowest specific heat capacity.
So, the metal which will reach the highest temperature is the metal with the lowest specific heat capacity.
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14- Which statements about acids and bases are correct? (1 mark) 1- An acid reacts with a metal to give off hydrogen. 2- A base reacts with an ammonium salt to give off ammonia. 3-An acid reacts with a carbonate to give off carbon dioxide. 4- Alkaline solutions are orange in methyl orange.
A) 1, 2 and 3
B) 1, 2 and 4
C) 1, 3 and 4
D) 2, 3 and 4
Answer:
a)
Explanation:
4th is incorrect.
Alkaline solutions are yellow in methyl orange.
Which statements about acids and bases are correct ?
A) 1, 2 and 3<3
A switch controls the current in a circuit that has a large inductance. The electric arc at the switch (Fig. CQ32.3) can melt and oxidize the contact surfaces, resulting in high resistivity of the contacts and eventual destruction of the switch. Is a spark more likely to be produced at the switch when the switch is being closed, when it is being opened, or does it not matter
When the circuit is opened, a spark is much more possible.
What is an inductor?The primary purpose of an inductor is the storage of energy. This is why an inductor helps to eliminate a spark in a circuit.
In the circuit as described in the question, we know that there is no current when the circuit is closed, the current across the inductor remains constant but rapidly decreases at the opening of the circuit this could lead to a spark.
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Prepare a project report on various samples of
a) a mixture
b) a compound
c) an element ( metal or non metal)
( 2 from each ) highlighting the main characteristics features of elements, compounds and mixtures.
Answer:
please mark me as brain list
Explanation:
Any substance that contains only one kind of an atom is known as an element. Because atoms cannot be created or destroyed in a chemical reaction, elements such as phosphorus (P4) or sulfur (S8) cannot be broken down into simpler substances by these reactions
Example: Water decomposes into a mixture of hydrogen and oxygen, on the other hand, cannot be decomposed into simpler substances. They are therefore the elementary, or simplest, chemical substances elements.
Each element is represented by a unique symbol. The notation for each element can be found on a periodic table of elements.
The elements can be divided into three categories that have characteristics properties: metals, nonmetals and semimetals. Most elements are metals, which are found on the left and toward the bottom of the periodic table. A handful of nonmetals are clustered in the upper right corner of the periodic table. The semimetals can be found along the dividing line between the metals and the nonmetals.
What mass of H2 forms when
35.25 g Al reacts with excess
hydrochloric acid?
2AI + 6HCI →→2AICI 3 + 3H₂
Based on the mass ratio, the mass of H₂ produced is 3.51 g of H₂
What is the mass ratio of a reaction?The mass ratio of a reaction is the ratio of the masses of the reactants as well as as products in a balanced equation of a reaction.
The equation of the reaction is given below;
2 AI + 6 HCI → 2 AICI₃ + 3 H₂
From the reaction equation, 2 * 27 g of Al produces 3 * 2 g of H₂
32.25 g of Al will produce: 6/55 * 32.25 g of H₂
Therefore, mass of H₂ produced is 3.51 g of H₂
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Answer:
From the reaction equation, 2 * 27 g of Al produces 3 * 2 g of H₂
32.25 g of Al will produce: 6/55 * 32.25 g of H₂
Therefore, mass of H₂ produced is 3.51 g of H₂
Explanation:
How many xenon atoms are contained in 2. 36 moles of xenon?.
Answer:
14.212 x 10^23 atoms
Explanation:
Xenon is a noble gas and is MONOTOMIC so
EACH mole is an Avagadro's Number of atoms
2.36 * 6.022 x 10^23 atoms =
How many grams of methane,
CH4, are produced from the
complete reaction of 5.15 moles
of carbon monoxide, CO?
CO+ 3H₂ → H₂O + CH4
[? ] g CH4
Answer:
82.606g
Explanation:
[tex]5.15mol CO* \frac{1 mol CO}{1 mol CH4} *\frac{16.04 g CH4}{1 mol CH4} =82.606g CH4[/tex]
Determine if the following is a compound , Element or Mixture
Compound is a group of same molecules, Element is a group of same atoms and mixture is combination of two or more pure substances.
What are Molecules ?
Molecules are the combination of two or more different atoms combine in a fixed ratio.
Molecules can be independently founded.
Atoms are always founded in combined state and does not occurs independently except rare earth elements which belongs to 18th group of periodic table.
Chemicals are taken in compound state But they undergo chemical reaction individually in molecular level.
Hence, Compound is a group of same molecules, Element is a group of same atoms and mixture is combination of two or more pure substances.
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in this experiment, calcium hydroxide was partially dissolved in pure water. which of the following choices correctly expresses the relationship between [ca2 ] and [oh−] in this mixture?
The relationship between [tex][Ca2^{2+}][/tex] and [tex][OH^{-}][/tex] in this mixture is that there are 2 mole of hydroxide ions for every 1 mole of calcium ions.
What is solubility of a solute?The solubility of a solute is the amount of solute that can dissolve in a given volume of solvent at a particular temperature.
Calcium hydroxide is partially soluble in water. The dissolution of calcium hydroxide in water produces calcium ions and hydroxide ions.
The equation of the reaction is given below:
[tex]Ca(OH)_{2} \leftrightharpoons Ca^{2+} + 2\:OH^{-}[/tex]
Based on the equation of reaction, there are 2 mole of hydroxide ions for every mole of calcium ions.
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What is a chemical bond?
A. When electrons are shared between atoms
B. When protons are shared between
C. When neutrons are shared between atoms
Answer:
a
Explanation:
the bond is shared between the atoms because whith out it you cant have one
How many moles of water form
when would be required to react
with 183.5 g Ba(OH)2 reacts with
excess HBr?
2HBr + Ba(OH)2 → BaBr2 + 2H₂O
[?] mol H₂O
how is uranus and saturn similar
Answer:
Like Saturn, Uranus has rings and moons. But unlike Saturn — and indeed every other planet in the solar system — the ice giant is tipped on its side. In other words, rather than spinning like a top as it circles the sun, Uranus rolls around on its side.
Explanation:
How many grams of oxygen are contained in a sample of H2O that also contains 3.85 moles of hydrogen atoms?
Answer:
30.8 g oxygen
Explanation:
There are 1/2 as many Oxygen moles as hydrogen moles in H2O
so there are 3.85 / 2 * 16 gm of oxygen = 30.8 gms oxygen
what will happen when a wax candle burned in air with limited oxygen?
Answer:
The molecules of carbon dioxide are heavier than air. When a result, as they descend over the flame and candle, they push the oxygen and other air molecules out of the path. The oxygen can no longer react with the wax when it is pushed away from the wick. The flame is put out as a result.
Answer:
if the candle is burned in air with limited oxygen supply the candle will go out of fire as the oxygen is reducing....
Explanation:
Hope It Helps!!!
PLEASE HELP FAST! When 23.3 g of O2 reacts with 18.3 g C10H8, what is the limiting reactant. The equation is C10H8 + 12O2 --> 10CO2 + 4H2O?
Choices:
A. C10H8
B. O2
C. CO2
D. H2O
Answer:
B
Explanation:
The answer is B, O2
O₂ is the limiting reagent.
What is a limiting reactant?A limiting reactant is described as the one that will be consumed first in a chemical reaction.
CalculationC₁₀H₈ + 12O₂ → 10CO₂ + 4H₂O
Given, Mass of O₂ = 23.3 g
Mass of C₁₀H₈ = 18.3 g
Molar mass of O₂ = 32 g
No. of moles of O₂ = 32/23.3 = 1.4 moles
Molar mass of C₁₀H₈ = 128 g
No. of moles of C₁₀H₈ = 128/18.3 = 6.9 = 7 moles
According to the equation,
1 mole of C₁₀H₈ yields 10 moles of CO₂. So, 7 moles of C₁₀H₈, give 70 moles of CO₂.
12 moles of O₂ yields 10 moles of CO₂. So, 1.4 moles of O₂ give 1.16 moles of CO₂.
We do know, however, that based on our balanced equation, if we were to totally react all 1.4 moles of O2, we could only produce a maximum of 1.16 moles of CO2. Even while there is enough C10H8 to generate more, the amount of O2 we have is a limiting factor because it will be consumed first.
So, our limiting reactant is O₂.
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You test your hypothesis by completing a(n) _________.
You test your hypothesis by completing an experiment.
How we test our hypothesis?We test our hypothesis by performing experiment or research because in an experiment, we test our hypothesis and collect data in order to draw a conclusion from it.
So we can conclude that you test your hypothesis by completing an experiment.
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a burning candle wax reacts with oxygen. after a glass jar is placed over it, the candle goes out. what is the limiting reactant?
If the candle goes out when a glass jar is placed over it, then oxygen is the limiting reactant.
What is a limiting reactant?The limiting reactant is the reactant that is present in the least amount. When the limiting reactant is exhausted, the reaction comes to a halt.
Thus, if the candle goes out when a glass jar is placed over it, then oxygen is the limiting reactant.
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What is the optimum pH of formic acid-formate buffer? (The pK, of formic acid is 3.75.)
1.875
3.75
5.625
7.50
The optimum pH of formic acid - formate buffer is 3.75
What is Buffer ?
A substance or a solution which resists any changes in pH, when acid or alkali is added to it.
pH = pKa + log[base] / [acid]
Considering equimolar concentration of acid and base
pH = 3.75 + log(x)/(x)
pH = 3.75 + log (1)
pH = 3.75 + 0
pH = 3.75
Hence,
The optimum pH of formic acid - formate buffer is 3.75
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Helpp!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
A homogenous mixture is that mixture in which the components mix with each other and its composition is uniform throughout the solution. A heterogenous mixture is that mixture in which the composition is not uniform throughout and different components are observed.
will you be my friend
Answer:
your cool
Explanation:
A balloon sits in the sunlight causing it to heat up and explode. Which of the following
explains what happened the best:
a. the particles of gas inside the balloon moved faster and decreased pressure in
the balloon, causing it to explode
b. the particles of gas inside the balloon moved faster and increased pressure in
the balloon, causing it to explode
c. the particles of gas outside the balloon moved faster and decreased pressure
on the balloon, causing it to explode
d. the particles of gas outside the balloon became more excited moved faster and
increased pressure on the balloon, causing it to explode
Fast food and juice boxes are example of which of these?
group of answer choices
habitat destruction
air pollution
water pollution
overpackaging
i need a answer within 20 mins i will give 30 points
Answer:
habitat destruction I think
Explanation:
Find the magnetic force experienced by a proton moving with the speed of 3 × 105 m/s in the magnetic field B of magnitude 6 × 10-5 T.
The magnetic force experienced by a proton moving with a speed of 3 ×[tex]10^{5}[/tex] m/s in the magnetic field B of magnitude 6 ×[tex]10^{-5}[/tex] T will be 2.88×[tex]10^{-18}[/tex] N.
Magnetic force can be defined as the attraction or repulsion force that arises between electrically charged particles due to the motion of the charged particles.
Given,
Speed = 3×[tex]10^{5}[/tex] m/s
Magnetic Field, B= 6 ×[tex]10^{-5}[/tex] T
Magnetic force is the product of velocity, the charge of a proton, and the magnetic field present there.
The magnetic force can be represented as:
F=qvB
F=1.6×[tex]10^{-19}[/tex]×3×[tex]10^{5}[/tex] ×6 ×[tex]10^{-5}[/tex]
F=2.88×[tex]10^{-18}[/tex] N
Hence, the magnetic force experienced by the proton will be 2.88×[tex]10^{-18}[/tex] N.
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Answer this please!!!
Answer:
c
Explanation:
The answer is both i and iii.
