A helium-filled balloon has a volume of 10 000 L at 20°C. Determine the volume of the
gas at 25 °C

Activation energy is the energy needed to begin breaking the bonds of reactants and is denoted as option D.

These are the substances which take part in a chemical reaction and result in the formation of the product.

The activation energy is required as it breaks the bonds of the reactant thereby resulting in the product being formed. This therefore makes it the most appropriate choice.

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Answer:

387 g/mol

Explanation:

The molar mass is a ratio comparing a substance's mass and molar value. The specific ratio looks like this:

Molar Mass (g/mol) = mass (g) / moles

You can plug the given values into the ratio to find the molar mass.

Molar Mass = mass / moles

Molar Mass = 0.406 g / 0.00105 mol

Molar Mass = 387 g/mol

The molarity of the solution is given as follows:

Molarity = 6.42/142/0.135 = 0.33 M

The concentration of the solution is given below:

Concentration = 43.2/58.5/0.29

Concentration = 2.54 mol/dm³

The concentration of the solution is given below:

Concentration = mass/molar mass /volume (L)

Concentration = 24.8/58.5/0.75

Concentration = 0.56 mol/dm³

Mass of NaCl = 0.238 * 58.5 * 0.35

Mass of NaCl =  4.87 g

Mass of AgNO₃ = 4.71 * 170 * 0.145

Mass of AgNO₃ =  116.1 g

Mass of AgNO₃ = 4.71 * 170 * 0.29

Mass of AgNO₃ =  232.2 g

In conclusion, the mass of the substances are derived from the volume and concentration of the solution as well as the molar mass of the substance.

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According to collision theory, the molecules' orientation is the only characteristic that won't affect whether two molecules will bond.

Factors affecting the collision theory:

                  1. collision with

                  2. have enough energy and

                  3. in the right orientation for collisions to succeed.

Therefore, the direction that two molecules are facing will not affect whether they will bond together according to collision theory that is option A is correct.

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The new pressure will be 7.65 atm

The problem is solved using the general gas equation:

P1V1/T1 = P2V2/T2

In this case, P1 = 3.4 atm, V1 = 1500 mL, T1 = 25 [tex]^O C[/tex], V2 = 2000 mL, and T2 = 75  [tex]^O C[/tex]

What we are looking for is P2.

Thus, P2 = P1V1T2/T1V2

          = 3.4 x 1500 x 75/25 x 2000 = 382500/50000 = 7.65 atm

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The original temperature of the copper is 145.4 °C

Temperature refers to the degree of hotness or coldness of a body. Now we know that the heat lost by the copper is equal to the heat gained by the water. The heat lost is negative while the heat gained is positive.

Hence;

-(mcdT)= mcdT

-(80.0 * 0.20 ( 26.9 - T)) = 100 * 4.12 * (26.9 - 22.3 )

-(430.4 - 16T) = 100 * 4.12 * (26.9 - 22.3 )

-430.4 + 16T = 1895.2

T =  1895.2 + 430.4 /16

T = 145.4 °C

The temperature of the copper is 145.4 °C.

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Decomposition reaction represents the breakdown of single compound into more products.

A decomposition reaction is a type of reaction in which one reactant breaks down into two or more products. This can be represented by the general equation: H2O2 →  2H + 2O. In this example the breakdown of hydrogen peroxide occurs and  water and oxygen are formed.

Zinc reacts with dilute sulphuric acid to form zinc sulphate and hydrogen This hydrogen goes up into the atmosphere whereas the zinc sulphate remains.

Magnesium ribbon should be cleaned before burning in air because Magnesium metal combines with oxygen to form Magnesium Oxide (MgO) layer, which is a very stable molecule.

Arteries have thick, elastic walls, while veins have thin walls because arteries are under more pressure, as compared to veins that are under less pressure. Arteries are big in size whereas veins are small.

The role of valves in the heart is that these valves prevent the backward flow of blood.

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In the solar cooker, reflective material like aluminum is used to collect and trap the heat from the sunlight while the interior is painted to reduce heat loss.

A solar cooker is a cooker which uses the energy of sunlight to cook food.

In designing a solar cooker, a solar collector such as reflective material like aluminum is used to collect and trap the heat from the sunlight.

The interior of the cooker is painted black to avoid heat loss by radiation.

Cardboard boxes are used as insulating materials.

In conclusion, a solar cooker is designed to maximize solar energy collected and minimize heat loss.

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Answer:

See below

Explanation:

Specific heat is  'c'

Q = m c  T      where T i s change in temp

675  = 55 c (118-25)

c = .13196      kJ / kg-C       ...I do not know what units you want....

                              this is also .13196 J/gm-C      

The acid that contains three hydrogen ions are called triprotic acid.

White solid pure anhydrous phosphoric acid melts into a viscous liquid at 42.35 degrees Celsius. Phosphoric acid, which contains three ion hydrogen atoms, acts as a triprotic acid in an aqueous solution. The hydrogen ions disappear one at a time.

H₃PO₄ (aq)  ⇄  H⁺ (aq) + H₂PO₄⁻ (aq)          Kₐ₁ = 7.5 × 10⁻³

H₂PO₄⁻ (aq)  ⇄  H⁺ (aq) + H₂PO₄²⁻ (aq)       Kₐ₂ = 6.2 × 10⁻³

HPO₄²⁻ (aq)  ⇄  H⁺ (aq) + PO₄³⁻ (aq)            Kₐ₃ = 7.5 × 10⁻³

The first dissociation constant of phosphoric acid indicates that it is not an especially potent acid. It is a weaker acid than hydrochloric acid and sulfuric acid, but stronger than acetic acid. The ease with which each subsequent dissociation stage happens decreases. As a result, H₂PO₄⁻  is a relatively weak acid but HPO₄²⁻ is an extremely weak acid.

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Joseph Stalin didn't allow elections in the nations the Soviets occupied with their troops after World War II because: option B.

The Cold War was a period of open and intense conflict between the United States of America and the Soviet Union that developed almost immediately after World War II (Second World War).

Also, the Cold War officially started on the 12th of March, 1947 and came to an end on the 3rd of December, 1989.

Based on historical information and records, we can reasonably infer that Joseph Stalin didn't allow elections in the nations the Soviets occupied with their troops after World War II because he knew these nations would be anti-Soviet since they had waged war in these nations.

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The formal charge of the nitrogen atom present at the center in dinitrogen sulfide is +1.

Formal charge:

The formal charge relates the presence of electrons on the atom when it is not present in a molecule and when it present in a molecule.

Lewis structure:

The structural representation of a compound by showing the electrons present around the atom with dots is called the Lewis dot structure.

The three possible Lewis structures of dinitrogen sulfide are shown below.

However, the best Lewis structure among those is first one. The central nitrogen atom is carrying a positive charge while the sulfur atom has a negative charge. The charges on these atoms are most stable thereby making the compound stable.

Therefore, the formal charge on the central nitrogen atom is +1.

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Answer:

A. Non-metal

B. Six

C. 2

D.NA2O

E.Oxygen

Explanation:

Oxygen is the element in the second period (second horizontal row) and Group VI A of the periodic table. These properties apply to oxygen

Answer:

there are 18 groups

Explanation:

Answer:

IA....... VIIIA. main groups (A groups)

IB....... VIIIB. sub groups (B groups)

totally they are 18

Answer:

A new type of technology that uses stem cells to grow body parts is called stem cell scaffolding.

Explanation:

"In stem cell transplants, stem cells replace cells damaged by chemotherapy or disease or serve as a way for the donor's immune system to fight some types of cancer and blood-related diseases, such as leukemia, lymphoma, neuroblastoma, and multiple myeloma. These transplants use adult stem cells or umbilical cord blood." - Mayo Clinic

The mass of carbon dioxide that is produced will be 31,671 grams or 31.671 kg

First, the equation of the reaction:

[tex]C_3H_8(g)+5O_2(g)-- > 3CO_2(g)+4H_2O(g)[/tex]

The mole ratio of propane burned to carbon dioxide produced is 1:3.

The density of propane gas is 0.621 g/mL, thus, 17.0 L of propane will weigh:

        Density = mass/volume, mass = 0.621 g/mL x 17000 = 10,557 g

Mole of 10,557 g of propane = 10557/44.1 = 239.39 moles

Equivalent mole of carbon dioxide produced = 239.39 x 3 = 718.16 moles

Mass of 718.16 moles carbon dioxide = 718.16 x 44.1 = 31,671 grams or 31.671 kg

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Answer:

Ethanol can be produced by fermentation and concentrated using fractional distillation .

Group Starts True

A rightward change in equilibrium.

The concentration of gases = [H2] will decrease, [N2] will increase, [NH3] will increase when the new equilibrium is reached.

Additional heat is produced.

The forward and backward reactions' rates quicken in the new equilibrium.

The equilibrium constant decreases as more heat is released.

the exothermic nature of the process.

The equilibrium constant would not have changed if the temperature had remained constant.

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The fraction of the mass in the tube is liquid is mathematically given as

kg =0.99876 kg liquid/kg

Generally, the critical volume is mathematically given as

Vc=0.0560* 1/18

Vc=0.00311m3/g

at state 1, at saturated condition having volume 0.003111 m3/kg

for 0.1mpa

V1=0.00104KJ/kg

Vg=1.6720KJ/kg

Hence, the  quality of the vapor-liquid mixture is

Q=[tex]\frac{0.00311-0.001043}{1.6720 - 0.001043}[/tex]

Q=0.001237kgv/kgm

Mass fraction of liquid present = (1-x)

M=(1-x)

Hence

M=(1-0.001237)

kg =0.99876 kg liquid/kg

In conclusion, a fraction of the mass in the tube is liquid

kg =0.99876 kg liquid/kg

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2Cl + 2e⁻ → 2Cl⁻ is the half reaction correctly describes the reduction that is taking place.

The half reaction of overall reaction in which reactants gain its electrons during the reaction is called Reduction Half Reaction.

The half reaction of overall reaction in which reactant loses electrons during the reaction is called Oxidation Half Reaction.

The given reaction is

2I⁻ (aq) + Cl₂ (aq) → 2Cl⁻ (aq) + I₂ (aq)

Reduction Half Reaction: 2Cl + 2e⁻ → 2Cl⁻

Oxidation Half Reaction: 2I⁻ - 2e⁻ → 2I

Here Cl₂ is an oxidizing agent and I⁻ is reducing agent.

Thus from the above conclusion we can say that 2Cl + 2e⁻ → 2Cl⁻ is the half reaction correctly describes the reduction that is taking place.

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Compared to water, the pH of a buffer solution resist changes when the same small amount of a strong acid (such as HCl) or strong base (such as NaOH) is added to both.

A buffer solution, also known as a buffer, is a mixture of a weak acid and its conjugate base (or a mixture of a weak base and its conjugate acid). When a weak acid or a weak base is applied in modest amounts, buffer solutions withstand the pH shift.

The conjugate base of the buffer system reacts with a small amount of strong acid to change it into the weak acid of the buffer system. The pH then just slightly declines, the weak acid concentration rises, and the conjugate base concentration falls.

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The answer is Water is produced.

Planck's constant symbolized (h) relates the energy in one quantum (photon) of electromagnetic radiation to the frequency of that radiation.

The equation, E=hf, is referred to as the Planck relation or the Planck-Einstein relation. The letter h is named after Planck, as Planck's constant.

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The equilibrium concentrations of all chemical species at room temperature are given below.

 H2(g)  +   I2(g) <-----> 2HI(g)

I              1          1                   0

c            -x        -x                  2x

E            1-x      1-x                 2x

[H2] ⇒ 1-x/1 = 1-x

[I2] ⇒ 1-x/1 = 1-x

[HI] ⇒ 2x

Kc = [HI]^2/[H2][I2]

55.3 = (2x)^2/(1-x)(1-x)

55.3 = (2x/1-x)^2

7.44 = 2x/1-x

7.44*(1-x) = 2x

x  = 0.788

[H2] ⇒ 1-x = 1-0.788 = 0.212M

[I2] ⇒ 1-x = 1-0.788 = 0.212M

[HI] ⇒ 2x = 2*0.788 = 1.576M

In a chemical reaction, while each reactant and the products are in a concentration that does not alternate with time any extra, it is said to be in a state of chemical equilibrium. in this kingdom, the price of forwarding response is the same as the rate of backward response.

Equilibrium is whilst the fee of the ahead reaction equals the charge of the opposite reaction. All reactant and product concentrations are consistent at equilibrium.

We are saying that a chemical is in an equilibrium concentration while the products and reactants do not change as time moves on. In different words, chemical equilibrium or equilibrium awareness is a state when the price of an ahead reaction in a chemical response will become equal to the rate of a backward response.

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The equilibrium concentrations of all chemical species at room temperature are given below.

[H2]  = 0.212M

[I2]  = 0.212M

[HI]  = 1.576M

H2(g)  +   I2(g) <-----> 2HI(g)

I              1          1                   0

c            -x        -x                  2x

E            1-x      1-x                 2x

[H2] ⇒ 1-x/1 = 1-x

[I2] ⇒ 1-x/1 = 1-x

[HI] ⇒ 2x

Kc = [HI]^2/[H2][I2]

55.3 = (2x)^2/(1-x)(1-x)

55.3 = (2x/1-x)^2

7.44 = 2x/1-x

7.44*(1-x) = 2x

x  = 0.788

[H2] ⇒ 1-x = 1-0.788 = 0.212M

[I2] ⇒ 1-x = 1-0.788 = 0.212M

[HI] ⇒ 2x = 2*0.788 = 1.576M

In a chemical reaction, while each reactant and the products are in a concentration that does not alternate with time any extra, it is said to be in a state of chemical equilibrium. in this kingdom, the price of forwarding response is the same as the rate of backward response.

Equilibrium is whilst the fee of the ahead reaction equals the charge of the opposite reaction. All reactant and product concentrations are consistent at equilibrium.

We are saying that a chemical is in an equilibrium concentration while the products and reactants do not change as time moves on. In different words, chemical equilibrium or equilibrium awareness is a state when the price of an ahead reaction in a chemical response will become equal to the rate of a backward response.

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Answer:

False

Explanation:

The subscripts of chemicals can't be changed in a chemical reaction, otherwise the products or the reactants would be a completely different molecule. We can't just change O2 to being O3, but we can change O2 into 3/2 O2 (in some cases)

0.4 M is the molarity of the solution.

The molarity of solution can be calculated by : [tex]C_M[/tex] = [tex]n/V[/tex] where,

n is the no. of moles of solute([tex]KMNO_4[/tex]) and

[tex]V[/tex] is the volume of the solution in L.

Now,

No. of moles can be calculated by: Given mass/ Molar mass

Molar mass of [tex]KMNO_4[/tex] is 158.034 g/mole

No. of moles of [tex]KMNO_4[/tex] = 36.1 g / 158.034 g/mole = 0.228 (app.) moles

Molarity of solution = 0.228 moles /0.566 L = 0.4 mol/L or 0.4 M

Hence, the molarity of a solution where 36.1 grams of potassium permanganate is dissolved in enough water to make 0.566 L of solution is 0.4 M

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Answer:

B.) A mixture can be separated by physical means.

Explanation:

While it may be difficult, mixtures can be separated back into their original elements/compounds. Compounds cannot be separated because their original elements/compounds bond together to form the new compound. The only way to separate compounds is through chemical (or drastic physical) means.

The percent by volume of propanone in the solution is  6.6 % .

Volume of solute ([tex]C_{3} H_{6} O[/tex]) = 20.0 mL

Volume of solution = 300 mL

To calculate the percent:

% by vol= (vol solute/vol of soln) x 100

             = (20mL C₃H₆O/300mL) x 100

             = 6.6 % propanone .

Therefore, the percent by volume of propanone in the solution is  6.6 %.

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