Two balloons, one containing 1.54 L hydrogen gas and the other containing 0.72 L of
helium gas, are at the same pressure and temperature conditions. If the second balloon
contains 0.100 mol of helium, then the mass of hydrogen gas in the first balloon is:
A. 0.43 g
B. 0.22 g
C. 0.094 g
D. 0.047 g

Answer:

Below in bold.

Explanation:

The equation is:

K2CO3 + 2HCl ---->  2KCl + CO2 + H2O

So 1 mole of K2CO3 produces 1 mole of CO2.

Number of moles of K2CO3 in the solution

= 0.25 * 26.10 / 1000

= 0.00625 moles

This produces 0.00625 moles of CO2

which is 0.00625*44

= 0.2871 grams.

Answer:

benzene molecule

Explanation:

The molecules exhibiting delocalization of electrons will have at least two resonance structures. These two resonance structure are having the equal energy.

Resonance is an electronic property of molecules by which, the sigma bond or pi bond moves from one location to other forming different mesomeric structures of the compound.

For example carbon dioxide can have two resonance structures.The lone pair in oxygen delocalize from one oxygen to the other. The double bond with carbon can be of either side of carbon. Thus one negative charge forms for one oxygen. This charge can be on the second hydrogen too.

In this way free electrons can delocalise through the orbitals and this process make the molecule more stable. The resonance structures together form the canonical structure which is the most probable and stable form of the compound.

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Lead is a toxic metal that affects the central nervous system. A Pb-contaminated water sample contains 0.0011% Pb by mass. 13.6 × 10³ ml water contains 150 mg of Pb.

Given percentage of Pb present in the sample solution is 0.0011%

That means 0.0011 grams of Pb present in the 100g of solution.

So,

= [tex]\frac{0.150\ \text{g Pb} \times 100\ \text{g water}}{0.0011\ \text{g of Pb}}[/tex]

= 13.6 × 10³ g water

The mass per unit volume is called density. Density is represented as D or ρ.

It is expressed as:

[tex]\rho = \frac{m}{V}[/tex]

where,

ρ = Density

m = mass of the object

V = Volume of object

Now put the value in above expression we get

[tex]\rho = \frac{m}{V}[/tex]

[tex]1\ g/ml = \frac{13.6 \times 10^3}{V}[/tex]

V = 13.6 × 10³ ml

Thus from the above conclusion we can say that Lead is a toxic metal that affects the central nervous system. A Pb-contaminated water sample contains 0.0011% Pb by mass. 13.6 × 10³ ml water contains 150 mg of Pb.

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1)The limiting reactant will be aluminum acetate

2) The mass of aluminum hydroxide formed will be 9.75 grams.

The equation of the reaction is as below:

[tex]Al(C_2H_3O_2)_3 + 3NaOH --- > 3C_2H_3NaO_2 + Al(OH)_3[/tex]

The mole ratio of the 2 reactants is 1:3.

Mole of 100 mL. 1.25 mol/L [tex]Al(C_2H_3O_2)_3[/tex] = 0.1 x 1.25 = 0.125 mol

Mole of 300 mL, 2.30 mol/L NaOH = 0.3 x 2.3 = 0.69 mol

Thus, aluminum acetate is limited.

Mole ratio of  [tex]Al(C_2H_3O_2)_3[/tex] and [tex]Al(OH)_3[/tex] = 1:1

Equivalent mole of [tex]Al(OH)_3[/tex] = 0.125 mol

Mass of 0.125 mole [tex]Al(OH)_3[/tex] = 0.125 x 78 = 9.75 grams.

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Life alters the atmosphere by producing and removing oxygen, carbon dioxide, and methane.

Burning fossil fuels like coal, and natural gas, including oil, solid waste, trees, and other biological materials release carbon dioxide into the atmosphere, along with some chemical reactions.

It is thought that the first billion years of Earth's history saw a lot of volcanic activity. With little to no oxygen, the early atmosphere was presumably primarily composed of carbon dioxide.

Therefore, life alters the atmosphere by producing and removing oxygen, carbon dioxide, and methane.

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Answer:

68.46 gms

Explanation:

2 molal solution means there is 2 moles of sucrose per kg of solvent (generally 1000 cc)

2 moles / 1000 ml * 100 ml = .2 moles

mole weight of sucrose = 342.3 gm/mole

342.3 gm/mole * .2 mole = 68.46 gms

The water cycle will be discussed here.

This is defined as the continuous manner in which water is moved within the earth and the atmosphere.'

The water cycle comprises of steps such as:

Humans however disrupt water cycle through the damming of rivers and deforestation.

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The rate of CO2 increase is in the last few hundred years is 10 times more with the rate of increase (or decrease, for that matter) in the preceding 400,000 years.

There are many possible reasons for this cause , some primary factors are listed below:

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In the endpoint when the indicator changes color it gives the information that the acid is neutralized by the base.

Titration is also known as titrimetry is a technique where a solution of known concentration is used to calculate the concentration of the unknown solution. Titration is a laboratory technique.

The point at which the indicator changes the color is known as Endpoint.

Thus from the above conclusion we can say that In the endpoint when the indicator changes color it gives the information that the acid is neutralized by the base.

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One type of acid-base buffer is composed of a weak acid , which will react with any added base, and its conjugate base, which will react with any added acid.

The buffer's weak base and strong acid combine to form a weak acid, which changes the pH only little and releases few H ions into solution.

A weak acid and the conjugate base of the weak acid, or a weak base and the conjugate acid of the weak base, are combined to form the buffer solution, a water-based solvent solution.

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Therac-25, AECL was able to reduce costs by replacing hardware safety features with software controls.

the Therac-25 was a laptop-controlled radiation therapy machine produced by Atomic energy state Canada limited in 1982 after the Therac-6 and Therac-20 units. It was involved in at least six accidents between 1985 and 1987, in which patients were given massive overdoses state radiation.

The Therac-25 machine was a state-of-the-art linear accelerator developed by using the company Atomic strength Canada restricted (AECL) and a French company CGR to provide radiation treatment to cancer sufferers. The Therac-25 become the most computerized and complicated radiation therapy device state its time.

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The appearance of the protist differ from that of the onion sample due to the presence of motile structures.

This is an eukaryote which could be unicellular or multicellular and examples include protozoa etc.

The major difference between a protist and onion sample is that protists have motile structures such as flagella, cilia etc while plant cells such as onions don't have.

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The empirical formula is = C2H4O2

Molecular formula=C2H4O2

Vinegar has three elements:

oxygen = 53.29%,

hydrogen = 6.70%,

and carbon = 40.01%.

We can create an equation for the total mass of vinegar with 'a' carbon atom,' b' hydrogen atom, and 'c' oxygen atoms using the molar masses of C, H, and O.

12*a + 1*b + 16*c = 60

We also know that C makes up 24 g/mol, or 40.01 percent, of the overall mass of 60 g/mol.

The formula contains two C atoms because each C atom has a molecular mass of 12 g/mol. You may determine that the formula contains 4 H and 2 O atoms by using the same reasoning for H and O.

The empirical formula is = C2H4O2

Molecular formula= (C2H4O2)n

(4 x 12 + 1 x 4 + 16 x 2)n = 60

(84)n = 60

n=60/84

n=0.71=1

Molecular formula=C2H4O2

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Rules that Casey breaks:

He didn't carefully examine the glassware before utilizing it.

Lab safety rules:

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A chemical reaction occurred because calcium oxide has different properties than calcium and diatomic oxygen. The correct option is A.

A chemical reaction is said to occur when the chemical properties of substances change during the course of the reaction.

From the illustration, the chemical properties of calcium oxide are unique from that of calcium and oxygen. Thus, calcium oxide has become a new substance entirely.

Once a reaction leads to the formation of new substances, such a reaction is a chemical reaction.

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The percent yield will be 95.75%

Mass of copper = 0.3295 g

Mass of filter paper + copper (II) oxide = 0.5723

Mass of filter paper only = 0.2568

Mass of copper (II) oxide = 0.5723 - 0.2568 = 0.3155

Percent yield = yield/total x 100%

                      = 0.3155/0.3295 x 100% = 95.75%

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Partial Pressure for dinitrogen monoxide gas is 187 kPa

Partial Pressure for sulfur tetrafluoride gas is 33.4 kPa.

To calculate partial pressure first we need to calculate number of moles (n).

Mole (n) = mass/molar mass

Number of moles of dinitrogen monoxide gas= 17.7/44 gram per mole = 0.4023.

n=0.4023

Number of moles of sulfur tetrafluoride= 7.77/108.1 = 0.07188 moles.

Pressure × volume = number of moles × gas constant, R × temperature.

Pressure = n × R × T/ V.

For dinitrogen monoxide gas -

Partial Pressure = 0.4023 × 8.314 × 280.03 / 5 × 10^-3 = 187 kPa.

Partial pressure of dinitrogen monoxide gas = 187kPa.

For sulfur tetrafluoride gas-

Partial Pressure = 0.07188 × 8.314 ( × 280.03 / 5 × 10^-3) = 33.4 kPa.

Partial pressure of sulfur tetrafluoride = 33.4kPa.

So, Partial pressure of dinitrogen monoxide gas = 187kPa.

Partial pressure of sulfur tetrafluoride = 33.4kPa.

Disclaimer = This question is incomplete. Please find the full content below.

Question:

5.00L tank at 7.03°C is filled with 17.7g of dinitrogen monoxide gas and

7.77g of sulfur tetrafluoride gas

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ksp = 2S²

= 2 [ 7.9* 10-⁴ moldm-³ ]²

= 124.82 * 10-⁸ mol² dm-⁶

The term Ksp denotes the solubility product. It is generally used to predict the precipitation of reactions. The  Ksp of PbSO₄ is  6.24 × 10⁻⁷.

The solubility product of a sparingly soluble salt is defined as the product of the molar concentrations of its ions in a saturated solution of it at a given temperature. By knowing the solubility product of a substance, it is possible to predict whether a substance precipitate out or not.

In short, the precipitation of an ionic substance from the solution occurs when the ionic product exceeds the value of its solubility product at that temperature.

Here PbSO₄ dissociates as:

PbSO₄ → Pb²⁺ (aq) + SO₄²⁻ (aq)

Ksp = [Pb²⁺] [SO₄²⁻ ]

= [7. 9 × 10⁻⁴] [7. 9 × 10⁻⁴]

= 6.24 × 10⁻⁷

Thus the value of Ksp is  6.24 × 10⁻⁷.

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The amount of ethane decreases

increasing the temperature (adding energy), will drive the reaction to the left

C2H4(g) <--> C2H6(g) + 137 kJ

because this reaction is an exothermic reaction and the heat is a product of this reaction, So when the number of temperature increases

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Answer:

3/4

Explanation:

2Al2O3 → 4Al + 3O2

Molar ratio of oxygen to aluminum is 3/4.

Answer: 3:4

Explanation: Got it right on Edge

The substrate and enzyme would bind and react before all temperatures could be tested.

Before all temperatures could be tested, the enzyme would stop functioning after a short while.

The enzyme and the substrate would bind and the reaction would breakdown hydrogen peroxide into hydrogen and oxygen. Once the majority of the substrate was consumed, the reaction would not proceed even if the enzyme was at the optimal temperature.

Specific substrate binding is a property of enzymes. For example, the enzyme catalase exclusively binds to hydrogen peroxide as a substrate.

The enzyme forms a complex with the substrate when it attaches to its active site, breaking down the substrate into products.

I understand the question you are looking for is this:

When testing the temperature of catalase, what would happen if you changed the temperature using the same tube with the same catalase and hydrogen oxide mixture?

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Answer:

C.) The reaction would move to the left, producing more NH₄CI.

Explanation:

The chemical equation:

NH₄Cl ↔ NH₃ + HCl

If you were to increase the amount of HCl, the equilibrium would shift to the left. This is because the system is trying to go back to equilibrium. The equilibrium was disturbed when more product (HCl) was added. In order to restore equilibrium, you need to do the same thing that was done to the products to the reactants. In other words, since the products increased, the reactants need to increase.

Group C : 32.1°C , 31.9°C, 31.8°C makes the most precise measurements of the object's temperature.

Precision :The degree of similarity between study results of the experiment if they were performed today under comparable conditions.

If repeated measurements yield similar results, the measurement is considered precise (or repeated surveys).

It means how closely all the results are related .

Therefore, there should be less difference between the measurements of all the results.

In option (a) , there is a difference of 1° in all the results.

In option (b) , there is a difference of approximately 1.5° in all the results.

In option (c), there is only 0.2° difference in all the results.

In option (d) , there is a difference of 3° in all the results.

Therefore, All the option of group (c) are closely related.

Hence, Group (c) 32.1°C, 31.9°C, 31.8°C makes the most precise

measurements of the object's temperature.

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Answer:

See below

Explanation:

It is melting the ice ( or other solid) at a constant temperature...the solid will absorb heat as it melts but remain at the same temp

Reaction at anode

2 Br-​ (aq) -----> Br2 (g) + 2e-

The product formed at the anode is Br2 (g).

In chemistry and production, electrolysis is a technique that makes use of direct electric present-day (DC) to power an otherwise non-spontaneous chemical response.

Electrolysis is commercially crucial as a degree inside the separation of factors from clearly going on sources including ores the usage of an electrolytic cell.

The voltage that is wanted for electrolysis to occur is called the decomposition capacity. The word "lysis" way to split or break, so in phrases, electrolysis would imply "breakdown via power".

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A.  This is not a redox reaction. It is an example of combustion.

During the combustion of a hydrocarbon, the hydrocarbon reacts with oxygen to create carbon dioxide, water, and heat.

2C8H18 + 25O2 → 16CO2 + 18H2O

Thus, we can conclude that, this is not a redox reaction. It is an example of combustion.

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Answer:

A: This is not a redox reaction. It is an example of combustion.

Explanation:

Many of the men may believe that they are fair and unbiased against women.

Many of the women may already believe that they face biases.

The propensity to seek for, understand, favor, and remember information that supports or confirms one's preexisting opinions or values is known as confirmation bias. People exhibit this bias when they choose facts that support their opinions while rejecting those that contradict them or when they interpret ambiguous facts as supporting their preexisting beliefs. Although confirmation bias cannot be completely avoided, it can be controlled, for instance, by critical thinking education and training.

Confirmation bias has been linked to poor decisions in the scientific, organizational, financial, and political spheres. These biases can preserve or reinforce views in the face of contradictory data and contribute to overconfidence in personal opinions.

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Answer:

Many of the men may believe that they are fair and unbiased against women.

Many of the women may already believe that they face biases.

Explanation:

The distinguishing characteristics of comets, meteors, and asteroids are its composition.

Asteroids are the fragments of rock that were left over from the creation of the solar system, Meteors are the rocks that enter the atmosphere of the Earth from space while on the other hand, Comets are the remnants of the formation of the solar system that are made of dust, rocks, and ice. All these materials i.e. comets, meteors and asteroids are different from one another due to its structure and chemical composition.

So we can conclude that the distinguishing characteristics of comets, meteors, and asteroids are its composition.

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The physical quantity used to qualitatively assess if a reaction is endothermic or exothermic in calorimetry is heat.

Measurements of heat transferred to or from a substance are determined using calorimetry.

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The physical quantity used to qualitatively assess if a reaction is endothermic or exothermic in calorimetry is heat.

Measurements of heat transferred to or from a substance are determined using calorimetry.

Characteristics of endothermic reaction:

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The oxidizing agent are the substance that is reduced because it gains electrons.

An oxidizing agent is defined as the agent that is capable of undergoing oxidation reaction by losing an electron.

The following are the characteristics of an oxidizing agent:

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Answer:

D: the substance that is reduced because it gains electrons.

Explanation: