Catalytic converters made of palladium (Pd) reduce automobile pollution by catalyzing the reaction between unburned hydrocarbons and oxygen. How does Pd increase the rate of this reaction?


A: By cooling the reactants
B: By splitting the oxygen atoms
C: By giving the hydrocarbons a negative charge
D: By decreasing the activation energy

Taking into account the definition of avogadro's number, 0.21 moles of sulfur dioxide contain 1.26482×10²³ molecules.

Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.

First you must determine the number of moles that 13.5 g of sulfur dioxide contains. For that, I use the molar mass of the compound, which is defined as the amount of mass that a substance contains in one mole.

In this case, the molar mass of sulfur dioxide is 64 g/mole. So the number of moles that 13.5 grams of the compound contain can be calculated as:

[tex]13.5 gramsx\frac{1 mole}{64 grams} =[/tex] 0.21 moles

Then you can apply the following rule of three: if 1 mole of sulfur dioxide contains 6.023×10²³ molecules, then 0.21 moles contain how many molecules of sulfur dioxide?

amount of molecules of sulfur dioxide= (6.023×10²³ molecules× 0.21 mole)÷ 1 mole

amount of molecules of sulfur dioxide=1.26482×10²³ molecules

Finally, 0.21 moles of sulfur dioxide contain 1.26482×10²³ molecules.

Learn more about Avogadro's Number:

The mass of a piece of aluminum with a volume of 264 mL and a density of 2.70 g/mL is calculated to be 712.8 grams.

To calculate the mass of a piece of aluminum with a volume of 264 mL when the density of aluminum is 2.70 g/mL, use the formula:

mass = density × volume

Here, the density (ρ) is given as 2.70 g/mL, and the volume (V) is 264 mL. Plugging these values into the formula gives us:

mass = 2.70 g/mL × 264 mL

When you do the calculation, the result is:

mass = 712.8 grams

Therefore, the mass of the piece of aluminum is 712.8 grams.

The mass of the piece of aluminum is 712.8 grams.

The density (p) is defined as mass (m) divided by volume (V). The formula is:

p = m / V

Given:

Density of aluminum, p = 2.70 g/mL

Volume of aluminum, V = 264 mL

To find the mass (m), rearrange the formula to solve for m:

m = p . V

Now, substitute the given values into the equation:

m = 2.70 g/mL × 264 mL

m = 712.8 g

Answer:

A

Explanation: Taking it now

Answer:

The relationship between initial temperature and final temperature is 2.

Explanation:

The reaction of:

HCl + NaOH → H₂O + NaCl + ΔH

Produce heat (ΔH). This heat is evidenced in the increasing of temperature in the system.

If you add 100 mL of 0,50M of both NaOH and HCl you will produce heat, that increase the temperature of the system in X°C.

Now, the addition of 200mL of 0,50M of both NaOH and HCl will produce twice the initial heat increasing the temperature of the system in 2X°C.

That means the relationship between initial temperature and final temperature is 2.

I hope it helps!

The pressure of a refrigerant cylinder containing saturated refrigerant is primarily determined by the temperature and the density of the refrigerant, according to the Clausius-Clapeyron equation. Other factors include the vaporization-condensation equilibrium and the sum of hydrostatic and atmospheric pressures.

The pressure of a refrigerant cylinder containing saturated refrigerant is determined by several factors, but primarily by the temperature and the density of the refrigerant. This is according to the Clausius-Clapeyron equation, which describes the relationship between a substance's vapor pressure and its temperature.

In scenarios involving supercritical fluids, such as a sample of water in a sealed container at a specific temperature, the pressure is determined by the vaporization-condensation equilibrium. This leaves us with a mixture of liquid and vapor, and a distinct pressure determined by the dense liquid and the less dense gas.

In addition, the pressure of a gas (assuming it behaves ideally) is also influenced by the hydrostatic pressure in the cylinder plus both the pressure of the vapour (due to vapor pressure of water) and the atmospheric pressure. An example would be a gas exerting pressure in a column of mercury, where the total pressure is the sum of the hydrostatic pressure due to the column of mercury and atmospheric pressure.

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Answer:

0.00000001

0.000001

0.000001 : 1 or 1 : 100

Explanation:

answer on e2020

Final answer:

Eating too many lipids can lead to fat deposits that strain the body, unhealthy weight gain, increased risk of cardiovascular disease, and potentially hypervitaminosis due to excess accumulation of fat-soluble vitamins when consumed in large quantities.(Option C)

Explanation:

A negative result of eating too many lipids, specifically saturated fatty acids, trans fats, and cholesterol, is that fat deposits can put a strain on the body. Excessive intake of lipids can lead to an unhealthy weight gain and a rise in blood lipid levels, which in turn may increase the risk of health problems such as cardiovascular disease.

Conditions like atherosclerosis, where cholesterol contributes to the narrowing of arteries, can manifest as a result of high cholesterol levels. Moreover, while fat-soluble vitamins A, D, E, and K are absorbed with the help of dietary fats, an overabundance due to excessive lipid intake can lead to hypervitaminosis, a state where excess vitamins are stored in the body's fat.

Percentage yield = (actual yield / theoretical yield) x 100%

The balanced equation for the reaction is,
    CH₄(g) + Cl₂(g) → CH₃Cl(g) + HCl(g)

Since there is excess of Cl₂ gas, we can assume that all of CH₄ gas are reacted.

Moles of CH₄(g) = mass / molar mass
                           = 25.0 g / 16 g/mol
                           = 1.5625 mol

The stoichiometric ratio between CH₄(g) and CH₃Cl(g) is 1 : 1

Hence moles of CH₃Cl(g) = 1.5625 mol

Molar mass of CH₃Cl(g) = 50.5 g/mol
 
Mass of CH₃Cl(g) = number of moles x molar mass
                             = 1.5625 mol x 50.5 g/mol
                             = 78.9 g
Hence theoretical yield = 78.9 g
Actual yield = 45.0 g

Hence,
 Percentage yield = (45.0 g / 78.9 g) x 100% 
                             = 57.03%

"It reacts with water" is incorrect I took the test and got it wrong. I believe it is B, because oxygen combines with glucose and makes carbon dioxide.

cellular respiration the starting compounds are glucose and oxygen and the ending compounds are carbon dioxide, water, and energy.

C6H12O6+6O2-->6CO2+6H2O+ energy

Glucose (sugar)+oxygen--> Carbon Dioxide+ water+energy

so It is one of the starting compounds

Agglutination reactions are used to locate the source of an epidemic because it is highly sensitive and may be used to detect the existence of antibody or antigen in a patient’s serum. Agglutination reactions are commonly used in the medical clinic. It can be used to identify the blood cells type for transfusion and to know the cultures of bacteria. It has been widely used to know if a patient had a bacterial infection.

Answer:

The agglutination reactions clinically exhibit a broad spectrum of applications. They facilitate in finding the existence of antibodies or antigens in the sample. The agglutination reactions can be used to find the epidemic source. This can be achieved by testing the blood sample of the patient.  

If the antibodies found in the sample of blood possess the tendency of undergoing agglutination with the disease-causing antigens, then it can be considered that the person has got encountered with the disease. In case of an epidemic, the samples of blood from the group of individuals is taken and examined for the agglutination reaction. Thus, the reaction can be used to find the source of the epidemic.  

At standard temperature and pressure, burning hydrogen gas reacts with oxygen to produce water vapor in a ratio where 12 liters of oxygen would produce 24 liters of water vapor, according to the stoichiometric relationship in the chemical equation.

When hydrogen burns, water vapor is produced according to the balanced chemical equation . This tells us that 2 volumes of hydrogen react with 1 volume of oxygen to produce 2 volumes of water vapor. Therefore, if 12 liters of oxygen are consumed at STP (standard temperature and pressure), an equivalent stoichiometric ratio would apply, and hence 24 liters of water vapor would be produced, because the ratio of oxygen to water vapor in the equation is 1:2.

At a neutral pH of 7, the amino acid exists in the zwitterionic form, with a positive charge on the nitrogen of the amino group and a negative charge on the oxygen of the carboxyl group. This is due to the molecule's ability to accept or donate protons.

The structure of a molecule at a certain pH is affected by the molecule's ability to accept or donate protons. Amino acids, which are the molecule in question here, contain both carboxyl (-COOH) and amino (-NH2) groups. These groups can either donate or accept protons, depending on the pH of the environment.

At a pH less than 7, the environment is acidic and has a high concentration of protons. The carboxyl group tends to donate a proton and exist as COO-, while the amino group attracts protons and forms NH3+.

At pH 7, the environment is neutral. In this condition, amino acids usually exist in the zwitterionic (dipolar) form, where the carboxyl group is COO- and the amino group is NH3+.

At pH greater than 7, the environment is basic with a lower concentration of protons. Here, the amino group tends to donate a proton and exist mostly as NH2, while the carboxyl group remains COO-.

So, at pH 7, the predominant form of an amino acid would be the zwitterionic form, with a positive charge on the nitrogen of the amino group and a negative charge on the oxygen of the carboxyl group.

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How does the law of conservation of mass apply  to this reaction: C2H4 + O2 → H2O + CO2?