The solubility of the gas if the pressure is changed to 100 kPa is 0.742 g/L
Effect of Pressure on SolubilityAs the pressure of a gas increases, the solubility increases, and as the pressure of a gas decreases, the solubility decreases.
Thus, Solubility varies directly with Pressure
If S represents Solubility and P represents Pressure,
Then we can write that
S ∝ P
Introducing proportionality constant, k
S = kP
S/P = k
∴ We can write that
[tex]\frac{S_{1} }{P_{1} } = \frac{S_{2} }{P_{2} }[/tex]
Where [tex]S_{1}[/tex] is the initial solubility
[tex]P_{1}[/tex] is the initial pressure
[tex]S_{2}[/tex] is the final solubility
[tex]P_{2}[/tex] is the final pressure
From the given information
[tex]S_{1} = 0.890 \ g/L[/tex]
[tex]P_{1} = 120 \ kPa[/tex]
[tex]P_{2} = 100 \ kPa[/tex]
Putting the parameters into the formula, we get
[tex]\frac{0.890}{120}=\frac{S_{2}}{100}[/tex]
[tex]S_{2}= \frac{0.890 \times 100}{120}[/tex]
[tex]S_{2}= 0.742 \ g/L[/tex]
Hence, the solubility of the gas if the pressure is changed to 100 kPa is 0.742 g/L
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If a zero order reaction has a rate constant k of 0.0416Mmin and an initial concentration of 2.29 M, what will be its concentration after 20.0 minutes
Answer:
1.46 M
Explanation:
[A]t=−(0.0416 M/min) x (20.0 min)+2.29 M
[A]t=1.46 M
What is the oxidation number of each element in PbO2
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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What is the ph of a solution of h2so4 that has [h3o ] = 5.45 × 10–5 m?
The pH of a solution of sulphuric acid that has hydronium ion concentration is 4.26.
How do we calculate pH?pH of any solution is define as the negative logarithm of the concentration of H⁺ ion present in any solution, i.e.
pH = -log[H⁺]
In the question, it is given that:
Concentration of hydronium ion or H⁺ ion = 5.45×10⁻⁵ M
So, pH will be:
pH = -log(5.45×10⁻⁵)
pH = -(-4.26)
pH = 4.26
Hence required pH is 4.26.
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Toda [4 MARKS] GROUP D: HIGHER ABILITY (HA) 74.2073 Supp. Q.No. 25 केही वस्तुहरूको घनत्व तालिकामा दिइएको छ। उक्त तालिका अध्ययन गरी निम्न प्रश्नहरूको उत्तर दिनुहोस् । (Density of some substance is given in a table. Study the table and answer the following questions:) वस्तु (Substances) घनत्व (Density) X 11 gm/cm Y 8 gm/cm 2Z 0.9 gm/cm i. समान पिण्ड भएका तीनओटा मध्ये सबभन्दा कम आयतन कुन वस्तुको होला ? (Which substance will have least volume if equal masşes of all are taken?) ii. समान आयतन भएका तीनैओटा मध्ये सबभन्दा कम पिण्ड कुन वस्तुको होला ? (Which substance will have the least mass if equal volume of all are taken?) iii. कुन वस्तु पानीमा उविएला ? (Which one will float on water?)
Answer:
Explanation
substance X will have least volume because it has maximum density and using the relation volume inversly propotional to the density of a substance.
substance Z will have least mass beacause it has least density and using relation mass is directly proportional to the volume of a substance .
substance Z will float in water because its density is less than the water (1 gm/cm^3).
3. Which of the following sentences apply to neutrons? a. have a negative charge. b. circle around the atom nucleus. c. are the only particles that form the nucleus. d. have a mass of 1 amu. SA 2
Answer:
d.have a mass of 1 amu..
Explanation:
Does not match a as the answer for a is electrons B.electron circle around the nucleus because neutrons are inside the nucleus.C.proton and neutrons make the nucleus so the only answer left is .d .which is correct
Answer:c are the only are the only particle that form the nucleus
Explanation:
_____AI(NO3)3 + _____NaOH —> ___Al(OH)3
+ _____NaNO3
Answer:
Al(NO3)3 + 3NaOH -----> Al(OH)3 + 3NaNO3
In a constant-pressure calorimeter, the temperature of 60.0 g of water increases by 4.50 °C.
What amount of heat is transferred to the water? (Specific heat capacity of water = 4.2 J/gºC)
O A. 7.88 KJ
द
OB. 1.13 KJ
O C. 1.13 J
o D. 7.88 J
The amount of heat transferred to the water if the temperature of 60.0 g of water increases by 4.50 °C is 1.134Kj.
How to calculate heat?The quantity of heat transferred to a substance can be calculated using the following formula:
Q = mc∆T
Where;
Q = quantity of heat (J)m = mass of substancec = specific heat capacity∆T = change in temperatureAccording to the information in this question;
Q = ?m = 60gc = 4.2J/g°C∆T = 4.5°CQ = 60 × 4.2 × 4.5
Q = 1134J
Therefore, the amount of heat transferred to the water if the temperature of 60.0 g of water increases by 4.50 °C is 1.134KJ.
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Fill in the missing values in the chart below please. If you can please show your work.
The volume and temperature changes in according to Charles' law will be:
T2 = 363 °CT1 = 869 KV1 = 5.35 LV2 = 144.6 mLWhat is the relationship between volume and temperature of a given mass of gas?The relationship between the volume and temperature of a given mass of gas is given by Charles' Iaw which states that volume is directly proportional to temperature if a gas in Kelvin.
[tex]Mathematically, V_1/T_1 = V_2T_2[/tex]To complete the tables volume and temperature changes:
T2 = 3.5 × (273 +45)/1.75 = 636 K = 363 °CT1 = 35 × 298/12 = 869 KV1 = 250 × 7.6/355 = 5.35 LV2 = 150 × (273 + 24)/(273 + 35) = 144.6 mLTherefore, volume and temperature are directly proportional.
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Question 4 of 10
What effect does adding a solute have on the freezing point of a solution?
A. The solution will not reach a freezing point temperature.
B. The temperature at which the solution freezes is raised.
C. The temperature at which the solution freezes is lowered.
D. The temperature at which the solution freezes is unchanged.
Answer:
C. The temperature at which the solution freezes is lowered.
What is two masses exerting a force on each other an example of?
Kepler's law
geocentric theory
universal law of gravitation
heliocentric theory
Answer:
universal law of gravitation
Explanation:
According to Newton's law of gravitation, every particle in universe attracts every other particles with a force which is directly proportional to the product of their masses and inversely proportional to the square of distance between their centres!
Consider two particles having masses m1 and m2 and are apart r units, then the gravitational force acting between them is given by
[tex]F = G \cdot \frac{m1\cdot \: m2}{ {r}^{2} } [/tex]
Where G is universal gravitational constant or proportionality constant!!
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When a liquid is heated, the average (blank) energy of its
particles will increase.
Answer:
trueee is the answer heh need points
When a liquid is heated, the average kinetic energy of its particles will increase.
What is Energy?The ability to do work is called as energy. Work done is product of force and displacement. Energy is of different types as sound energy, kinetic energy, potential energy, electrical energy, light energy etc.
Law of conservation of energy states that energy can neither be created nor destroyed, but it can be transferred from one form to another.
Molecules can move so they show kinetic energy, molecules can be there at many positions so they can show potential energy, molecules can vibrate so they can show sound energy but molecules can only absorb light hence they can't have light energy.
Average kinetic energy = 3KT/2
If temperature increases, kinetic energy also increases.
Therefore, When a liquid is heated, the average kinetic energy of its particles will increase.
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Look at the screenshots and then answer! Please I need help
Correct answer gets brainlisted :)
Answer:
The first one goes second.
The thirth one goes first,
and the second goes third.
Explanation:
Consider the following oxidation-reduction reaction: 2fe3+(aq) + 2hg(l) + 2cl−(aq) → 2fe2+(aq) + hg2cl2(s). indicate the oxidizing agent and the reducing agent.
Answer:
The reducing agent is Hg (mercury) and the oxidixing agent is Cl (chlorine)
Explanation:
first find the oxidation charges of each of the different ions. All elements that are alone have a charge of 0. As you compare the reactants and products we can see that the chargers of Hg and Cl have changed.
Hg went from a charge of 0 to a charge of +1
Cl went from a charge of 0 to a charge of -1
remember when a substance gains electrons it is reducing and when a substance is losing electrons it is oxidizing.
use the acryonm
OIL
Oxidizing Is Losing
RIG
Reducing Is Gaining
Which substance is beneficial to the aquatic life?
Dissolved Oxygen
Phosphates
Sewage
Plastic
Barium nitrate Ba (NO3)2 is used to produce a green colour in fireworks. It is the product of Barium Hydroxide with HNO3. Propose its balanced chemical equation
The balanced chemical equation for the reaction between barium hydroxide, Ba(OH)₂ and HNO₃ to produce barium nitrate, Ba(NO₃)₂ is
Ba(OH)₂ + 2HNO₃ —> Ba(NO₃)₂ + 2H₂O
What is a chemical equation?Chemical equations are representations of chemical reactions using symbols and formula of the reactants and products.
The reactants are located on the left side while the products are located on the right side.
Reactants —> Products
The balancing of chemical equations follows the law of conservation of matter which states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.
How to write the balanced equationBa(OH)₂ + HNO₃ —> Ba(NO₃)₂ + H₂O
There are 2 atoms of N on the right side and 1 atom on the left side. It can be balanced by writing 2 before HNO₃ as shown below:
Ba(OH)₂ + 2HNO₃ —> Ba(NO₃)₂ + H₂O
There are 4 atoms of H on the left side and 2 atoms on the right side. It can be balanced by writing 2 before H₂O as shown below
Ba(OH)₂ + 2HNO₃ —> Ba(NO₃)₂ + 2H₂O
Now, the equation is balanced
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62. Write formulas for the following substances and
designate their physical states.
a. nitrogen dioxide gas
b. liquid gallium
c. barium chloride dissolved in water
d. solid ammonium carbonate
The formulas for the substances and designate their physical states as follows:
a. nitrogen dioxide gas NO₂(g)
b. liquid gallium GA (I)
c. barium chloride dissolved in water BaCI₂ (aq)
d. solid ammonium carbonate (NH₄) 2CO₃ (s)
What is chemical formula ?The term chemical formula is defined as an expression that presents the elements in a compound and the relative proportions of those elements.
If only one atom of a particular type is present, no subscript is used. For atoms that have two or more of a particular type of atom present, a subscript is written after the symbol for that atom.
It presents the constituent element and the number of atoms of each element present in one molecule of the compound. It also corresponds to the molecular mass of the compound.
Thus, The formula of nitrogen dioxide gas is NO₂(g).
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