a sample of gas occupies a volume of 68.6 ml . as it expands, it does 142.1 j of work on its surroundings at a constant pressure of 783 torr . what is the final volume of the gas?

Answer:

(1)  LiCl + CaBr2 → CaCl2 + LiBr

     Balanced

    2LiCl + CaBr2 → CaCl2 + 2LiBr

(2) Cr(OH)3 + Na2CO3 → NaOH + Cr2(CO3)3

     Balanced

     2Cr(OH)3 + 3Na2CO3 → 6NaOH + Cr2(CO3)3

(3)   Sr3N2 + KClO3 → Sr(ClO3)2 + K3N

      Balanced

      Sr3N2 + 6KClO3 → 3Sr(ClO3)2 + 2K3N

(4) Fe(NO3)2 + AlPO4 → Fe3(PO4)2 + Al(NO3)3

     Balanced

      3Fe(NO3)2 + 2AlPO4 → Fe3(PO4)2 + 2Al(NO3)3

(5) CuSO4 + AgNO3 →  Ag2SO4 + Cu(NO3)2

     Balanced

     CuSO4 + 2AgNO3 →  Ag2SO4 + Cu(NO3)2

(6)   HCl + Ba(OH)2 → H2O + BaCl2

      Balanced

       2HCl + Ba(OH)2 → 2H2O + BaCl2

(7) CsCN + SnF4 → CsF + Sn(CN)4

    Balanced

  4CsCN + SnF4 → 4CsF + Sn(CN)4

(8) (NH4)2S + Mg(NO3)2 →  MgS + NH4NO3

     Balanced    

     (NH4)2S + Mg(NO3)2  → MgS + 2NH4NO3

(9) Na2CrO4 + Mo(OH)3 → NaOH + Mo2(CrO4)3

    Balanced

    3Na2CrO4 + 2Mo(OH)3 → 6NaOH + Mo2(CrO4)3  

(10) Ni(C2H3O2)2 + H3PO4 → Ni3(PO4)2 + C2H4O2

      Balanced

     3Ni(C2H3O2)2 + 2H3PO4 → Ni3(PO4)2 + 6C2H4O2

Answer:

Explanation:

GIven that:

The activation energy = 250 kJ

k₁ = 0.380 /M

k₂ = ???

Initial temperature \(T_1 =\) 1001 K

Final temperature \(T_2 =\) 298 K

Applying the equation of Arrhenius theory.

\(In \dfrac{k_2}{k_1 }= \dfrac{Ea}{R}( \dfrac{1}{T_1 }- \dfrac{1}{T_2})\)

where ;

R gas constant = 8.314  J/K/mol

\(In \dfrac{k_2}{0.380 }= \dfrac{250 * 10^3}{8,314}( \dfrac{1}{1001 }- \dfrac{1}{298})\)

\(In \dfrac{k_2}{0.380 }= -70.8655\)

\(\dfrac{k_2}{0.380 }= e^{-70.8655}\)

\(\dfrac{k_2}{0.380 }= 1.67303256 \times 10^{-31}\)

\({k_2}= 1.67303256 \times 10^{-31} \times {0.380 }\)

\({k_2}= 6.3575 \times 10^{-32}\)  /M .sec

Half life:

At 1001 K.

\(t_{1/2} = \dfrac{In_2}{k_1}\)

\(t_{1/2} = \dfrac{0.693}{0.38}\)

\(t_{1/2} =\) 1.82368 secc

At 298 K:

\(t_{1/2} = \dfrac{0.693}{6.3575 \times 10^{-32}}\)

\(t_{1/2} =1.09 \times 10^{31} \ sec\)

Answer:

Cornea

Lens

Retina

Explanation:

Brainliest?

10) there are approximately 0.00768 moles in 1 g of isopentyl acetate.

15) we will get 123.25 g of NaCl after the reaction.

10/ To calculate the number of moles in 1 g of product, you can use the formula:

No. of moles = given mass/molar mass

Molar mass of isopentyl acetate = 130.19 g/mol

No. of moles of C₇H₁₄O₂= 1/130.19 ≈ 0.00768 mol

Therefore, there are approximately 0.00768 moles in 1 g of isopentyl acetate.

15/ The balanced equation for the reaction between chlorine and metallic sodium is given as: 2 Na + Cl₂ → 2 NaCl

The molecular weight of NaCl is 58.44 g/mol and 1 mole of NaCl consists of 1 mole of sodium and 1 mole of chlorine.

To find how much cooking salt we will get, we need to first determine the limiting reagent (the reactant that is entirely consumed in the reaction).

The amount of moles of Cl₂ used = 150 g/ 70.90 g/mol = 2.11 moles

The amount of moles of Na used = 200 g/22.99 g/mol = 8.70 moles

Since the stoichiometric ratio is 1:1, chlorine is the limiting reagent

. Therefore, it will be entirely consumed and no chlorine will be left at the end of the reaction.

The amount of NaCl produced = 2.11 mol × 58.44 g/mol = 123.25 g

Therefore, we will get 123.25 g of NaCl after the reaction.

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Answer:

Definitely not. This is because the alkaline earth metal [basically group 2 elements] are reactive and will react with the contents of the can, contaminating it.

No, alkaline earth metals would not be a good replacement for tin in a tin can because alkali from alkaline earth metals react with tin and release hydrogen.

Alkaline earth metals are present in group 2 of the periodic table. They are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).

They are called alkaline earth metals because their hydroxide and oxides are highly alkaline. Their metal oxides are found in the earth's crust.

These metals have 2 electrons in their outer shell, and they are highly reactive, so they will react with the tin in a tin can.

Thus, alkali from alkaline earth metals react with tin and generate hydrogen, hence they would not make an acceptable replacement for tin in a tin can.

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The value of x should be 1/9.

The proportion of Californians who are elderly is 0.111.

The probability that a person has received a vaccine shot given that the person is elderly is 70%

The probability that a person has received a vaccine shot given that the person is not elderly is 2%

Probability that a person is elderly given that the person has received a vaccine shot is to be calculated.

Probability that a person is elderly and has received a vaccine shot,

P(E and V)=P(V | E) P(E)P(V | E) = 70%, P(E) = 0.111, soP(E and V) = (0.7) (0.111) = 0.0777

Probability that a person has received a vaccine shot, P(V) = P(E and V) + P(NE and V) P(NE) = (0.7) (0.111) + P(NE and V) P(NE) = 0.0777 + P(NE and V)P(NE and V) = P(V | NE) P(NE)P(V | NE) = 2%, soP(NE and V) = (0.02) (1 - 0.111) = 0.0178P(V) = 0.0777 + 0.0178 = 0.0955

Probability that a person is elderly given that the person has received a vaccine shot, P(E | V) = P(E and V) / P(V) = 0.0777 / 0.0955 = 0.8148(a) P(Bc|A) is the probability of driver’s blood alcohol percentage is not exceeding the legal limit, given that the breath analyzer indicates that legal limit is exceeded.

(b) We know that P(A|B) = P(Ac|Bc) = 0.95 and P(B) = 0.05P(A) = 1 - P(Ac) = 1 - 0.95 = 0.05P(Bc|A) = P(Ac|Bc) P(Bc) / P(A)P(Bc) = 1 - P(B) = 1 - 0.05 = 0.95P(Bc|A) = 0.95 × 0.95 / 0.05 = 18.05(c) P(B|A) = x and P(A) = 0.05P(Ac) = 0.95, P(B|Ac) = 0P(B|A) = P(B and A) / P(A)P(B and A) = P(B|A) P(A) = x (0.05)P(Bc|Ac) = 1 - x = P(Ac|Bc) = P(Bc|Ac) P(Ac) / P(Bc) = (1 - x) (0.95) / 0.95P(B) = P(B and A) + P(B and Ac) = x (0.05) + (1 - x) (0.95) = 0.95 - 0.9 x

Therefore,0.9 x = 0.95 - 0.05x = 1/9

Hence, the value of x should be 1/9.

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When table salt (sodium chloride which ionizes into Na and Cl) is added to alginate, a gel does not form and spherification does not occur. This happens because the salt only has one positive charge that neutralizes the negative charge in the alginate.

There are various types of Spherification. Spherification is the creation of small spheres with a thin film on the surface and a liquid center. The process of spherification is mostly used in molecular gastronomy to make small, flavorful balls of liquid ingredients that burst in the mouth when bitten into. The method involves a process of encapsulating liquid droplets in a sphere made of a gel-like film. This process requires sodium alginate (E401), a gel-forming ingredient that thickens the liquids.

Sodium alginate gelation occurs as a result of the mixture of an alginate solution with a cation solution that causes the solution to gel. The sodium ions present in the solution swap with calcium ions present in the cation solution, causing a gel to form. This occurs as a result of a chemical reaction known as cross-linking. When table salt is added to the alginate solution, a gel does not form and spherification does not occur since the salt only has one positive charge that neutralizes the negative charge in the alginate. Alginate requires a doubly charged cation to cross-link.

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Answer:

Na valency 1

Explanation:

Na -sodium.

This element is in the 1A group, so it has 1 electron on the last (valent) level.

So, only 1 electron can participate in forming chemical bond, and therefore the valency of Na is 1.

The subatomic particle that plays the greatest part in determining the properties of an element is the electron (B).

The properties of an element are primarily determined by its atomic structure. Elements are characterized by the number of protons, neutrons, and electrons they possess.

Protons and neutrons are located in the nucleus of an atom, while electrons orbit around the nucleus in energy levels or shells.

The electron configuration of an atom, specifically the arrangement and distribution of electrons in the outermost shell, is what primarily influences the chemical and physical properties of an element. The behavior of atoms in chemical reactions, bonding patterns, and electrical conductivity are all related to the movement and interactions of electrons.

Although protons and neutrons contribute to factors such as atomic mass and stability, the electron's involvement in chemical reactions and interactions is most significant in determining an element's properties.

Therefore, the subatomic particle that plays the greatest part in determining the properties of an element is the electron (B).

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The method used to obtain colored light from a filament lamp is additive. A filament lamp is a device that emits white light when it's turned on. However, the light can be made to appear colored by using a technique called additive color mixing. In this method, colored filters are used to filter the white light emitted by the filament lamp. The colored filters absorb some of the light wavelengths and allow others to pass through. When different colored filters are used, the colors of the light that passes through them combine to produce a new color. This method is called additive because the colors of light are added together to produce a new color.

The correct option is A. additive.

Answer

To answer this question we need to use the following equation

P1/T1 = P2/T2

We can rearrange to make T1 subject of the formula as shown

T1 = (P1 x T2)/ P2

= (3.40 x 340)/ 5.90

= 195.9 K

Explanation:

V = 20

V = 5

M/V = Density

20 / 5 = 4

The term for the propane and butane phases that can be liquefied is "liquefied petroleum gas" or LPG. LPG is a mixture of propane and butane gases that are compressed and cooled to a point where they transition from their gaseous state to a liquid state.

This process of converting the gases into a liquid form allows for easier storage, transportation, and handling. LPG is commonly used as a fuel for heating, cooking, and powering various appliances. It is widely available in portable cylinders and larger storage tanks. LPG has a higher energy content compared to its gaseous form, making it a convenient and efficient fuel source. The ability of propane and butane to be liquefied and stored as LPG is due to their relatively low boiling points and the pressure at which they are compressed. By controlling the temperature and pressure, the gases can be condensed into a liquid state, allowing for greater convenience and versatility in their use.

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Answer:

stratosphere

Explanation:

This reaction can be written as:

HF(aq) + Ba2+(aq) + 2OH-(aq) → BaF2(s) + H2O(l)

The net ionic equation for the reaction between aqueous solutions of hydrofluoric acid (HF) and barium hydroxide

(Ba(OH)2) is : HF + Ba(OH)2 → BaF2 + H2O.

The net ionic equation for the reaction is:

HF + Ba(OH)2 → BaF2 + H2O

Chemically, this reaction can be written as:

HF(aq) + Ba2+(aq) + 2OH-(aq) → BaF2(s) + H2O(l)

An ionic equation is a chemical equation that describes the movement of ions in a chemical reaction. In an ionic equation, charged ions are represented by their chemical symbols and charges. Neutral molecules are represented by their chemical formulas.

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Resistance exercise can impact nitrogen balance by promoting an increase in muscle protein synthesis and reducing muscle protein breakdown. This results in a positive nitrogen balance, indicating that the body is retaining more nitrogen than it is excreting.

Resistance exercise stimulates muscle protein synthesis, which is the process of creating new proteins in muscle cells. This increase in protein synthesis requires a positive nitrogen balance, as proteins are composed of amino acids, and nitrogen is an essential component of amino acids. During resistance exercise, the body adapts to the increased demand by enhancing the rate of muscle protein synthesis.

Additionally, resistance exercise also reduces muscle protein breakdown. By engaging in resistance training, the body signals a need to preserve muscle tissue, leading to a decrease in muscle protein breakdown.

The combination of increased muscle protein synthesis and reduced protein breakdown results in a positive nitrogen balance, indicating that the body is retaining more nitrogen than it is losing. This is important for muscle growth and adaptation to resistance training.

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Answer:

computer is a device used to make work easy and comfort

Answer:

._______.

Explanation:

Explanation:

The forces of attraction between one individual molecule and another. ... Gas phase molecules will in turn condense. ... The vapor pressure of a molecular substance depends on the strength of its ... If the external pressure on a liquid is increased, the vapor pressure of the liquid must___ in order for the liquid to boil.

Answer:

It has a chemical called cinnamaldehyde in it and cinnamaldehyde is a skin irritant

Explanation:

Answer:

infrared light

Explanation:

if calories were supplied to a sample of ethyl ether, you could vaporize 0.0046 grams at its boiling point.

The amount of ethyl ether that can be vaporized at its boiling point if calories are given to it can be determined using the following equation.

Q = m × ΔHv

where Q is the energy needed to vaporize the sample, m is the mass of the sample, and ΔHv is the molar heat of vaporization.

The molar heat of vaporization for ethyl ether is 26.0 kJ/mol.

To find the amount of ethyl ether that can be vaporized, we will use the formula Q = mcΔT,

where c is the specific heat of ethyl ether, which is 1.72 J/g°C, and ΔT is the change in temperature between the initial and final states.

To find the quantity of ethyl ether vaporized, we'll use the following formula:

Q = mcΔT = mΔHv = (m)(1.72 J/g°C)(34.6°C) = (m)(26.0 kJ/mol)

where m is the mass of ethyl ether in grams.

Let's solve the equation for m as follows:

m = (Q/ΔHv)(1/1000)(1/1.72)(1/34.6)g = (Q/ΔHv)(0.0004)g

where g is the mass of ethyl ether in grams, and Q/ΔHv is in units of mol.

Using the numbers provided, we get:

m = (300/26.0)(0.0004)gm = 0.0046 g

Therefore, if calories were supplied to a sample of ethyl ether, you could vaporize 0.0046 grams at its boiling point.

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Answer:

B.) sodium water right arrow. sodium hydroxide hydrogen

Explanation:

Reactants are listed before the arrow and products are listed after the arrow. This symbolizes the reactants turning into the products.

Reactants --> Products

Reactants are the molecules which react with each other to make new molecules. Since sodium and water are being combined, they are the starting molecules. Products are the molecules made after a reaction occurs. Sodium hydroxide and hydrogen gas are produced, making them the ending molecules. The balanced chemical equation is:

2 Na⁺ (s) + 2 H₂O (l) --> 2 NaOH (s) + H₂ (g)

Answer:

A. They include both oxidation and reduction reactions AND B. Electrons are transferred.

Explanation:

a p e x

The statements that are true about redox reaction are:

A. They include both oxidation and reduction reactions,

B. Electrons are transferred.

The Redox reaction is the one in which oxidation and reduction take place simultaneously. In this process transfer of electrons takes place which further leads to oxidation or reduction.

Thus, options A and B are correct.

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1.  We can see here that energy is required to change the phase of matter. For example, energy is required to melt ice, vaporize water, and condense steam. The amount of energy required to change the phase of matter is called the latent heat.

Energy is a fundamental concept in physics and refers to the ability or capacity of a system to do work or produce a change.

2. The demonstration on the sample of water showed that water can exist in three phases: solid, liquid, and gas. The solid phase is ice, the liquid phase is water, and the gas phase is steam.

The demonstration started with ice at 0°C. As heat was added to the ice, the temperature of the ice increased. However, the ice did not melt until the temperature reached 0°C. This is because the energy from the heat was used to break the bonds between the water molecules in the ice. Once the bonds were broken, the ice melted and became water.

3. Completing the

Page 4:

Heating and cooling curves are graphical representations of how temperature changes during the process of heating or cooling a substance. They illustrate the relationship between temperature and the state of matter.

Both curves show:

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Answer:

Explanation:

The pH of a solution can be found by using the formula

\(pH = - log ([ {H}^{+} ])\)

From the question

[H+] = 0.045 M

We have

\(pH = - log(0.045) \\ = 1.346787...\)

We have the final answer as

Hope this helps you

Answer:

1.35

Explanation:

Answer:

2  L

Explanation:

Answer:

D

Explanation:

The answer should be that the solution is unsaturated

Answer:

1. 749.6

2. 159.8

3. 60.4

4. 19,840,275

5. 8.029118938015202

6. 267.984

7.  1,017.169517

8.  45,945

9.   28,710

10.  14.42169022209403

11.    0.1341

and that is all that I am going to give you for the last few try to use a calculator    

Explanation:

use a calculator

160 ml of a 4.0% (m/v) amino acid solution contains 6.4 g of amino acids.

We can use the idea of ​​percent concentration to determine how many grams of amino acids are present in 160 mL of a 4.0% (m/v) amino acid solution. Expressed by the mass percent concentration of the solute (amino acid) per 100 ml of solution. Since the solution in this example is 4.0% (m/v), 100 mL of solution contains 4.0 g of the amino acid.

We can make a ratio to determine how many grams are in 160 ml:

4.0 grams / 100 ml = x grams / 160 ml

When we cross multiply for x, we get:

x = (4.0 grams / 100 ml) * 160 ml

x = (0.04) * 160

x = 6.4 grams

Consequently, 160 mL of a 4.0% (m/v) amino acid solution contains 6.4 g of amino acids.

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Its density of an object in grams per cubic centimeter is  65 . 5 g/ \(c m^{3}\)  .

Calculation ,

Formula used :

density = mass / volume                 ( i )

Given mass  of an object in kilogram ( kg ) = 0.124 kg

Given mass of an object in gram ( g ) = 0.124 kg × 1000 = 124 gram

Given volume  of an object = 1893 \(mm^{3}\) =  1893 × \(10^{-3}c m^{3}\) = 1.893 \(c m^{3}\)

We have to find density of an object in grams per cubic centimeter .

Putting the value of mass of the object and volume in equation ( i ) we get  density of an object in grams per cubic centimeter .

density = mass / volume

density  = 124 gram /  1.893 \(c m^{3}\)  

density = 65 . 5 g/ \(c m^{3}\)  

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