How many moles of oxygen gas could be produced by 120 moles of lead (II) nitrate?

Answer:

0.172 M

Explanation:

A. Gamma rays and X-rays are ionizing radiation that are approved for use on foods.

They are often used to kill bacteria and other microorganisms that can cause food spoilage, as well as to extend the shelf life of certain foods.

Gamma rays and X-rays have enough energy to remove electrons from atoms or molecules, which can break chemical bonds and destroy the microorganisms present on the food.

C. Sun rays and D. microwaves are not ionizing radiation and are not approved for use on foods in the same way that gamma rays and X-rays are.

Sun rays can have ionizing radiation at high altitude but not the levels we see at the surface of the earth. Microwaves are non-ionizing radiation and are primarily used to heat food, but not to sterilize or preserve it.

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Explanation:

Individual gas molecules have different speeds. Collisions between these molecules can change individual molecular speeds, but this does not affect the overall average speed of the system.

Answer:

It is proved that sin20=2sin0.cos0

Explanation:

Given

\(0=30\) °

\(sin20=2sin0.cos0\)

Substituting the value of "0" on both the sides, we get -

\(sin2 (30) =2sin 30 * cos 30\\sin 60 = 2 * sin 30 * cos 30 \\0.866 = 2 * 0.5 * 0.866\\0.866 = 0.866\)

Since LHS = RHS

we can say that \(sin20=2sin0.cos0\)

Answer:

sf2 is a molecule that has a net dipale moment.

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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Answer:

A. Chemical

B. physical

Explanation:

Answer:

1.0 something depending on your periodic table.

Explanation:

You are given atoms. Not molecules. The mass is what you would read from the periodic table. 1.000 in some form is the answer.

In nature, Hydrogen is found as H2 everywhere except in the sun or a star. The molecular mass (not the atomic mass) would be 2.000 something.

The statement is FALSE. Non-ferrous metals can be hardened by heat treatment, although the mechanisms and processes involved may differ from ferrous metals.

Heat treatment techniques such as precipitation hardening can be used to increase the strength of non-ferrous metals. Non-ferrous metals are metals or alloys that do not include iron (or iron allotropes, such as ferrite, etc.) in significant quantities. Non-ferrous metals are employed because they have desired qualities like reduced weight (for example, aluminium), greater conductivity (for example, copper), non-magnetic characteristics, or corrosion resistance (for example, zinc), even though they are often more expensive than ferrous metals. In the iron and steel sectors, several non-ferrous materials are also employed. Bauxite, for instance, is used as a flux in blast furnaces, whereas wolframite, pyrolusite, and chromite are utilised to create ferrous alloys.

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A substance's density, energy, and intermolecular bonds between particles would be affected if it had to melt from a solid into a liquid.

The solid and liquid phases are in equilibrium at the melting point.

The chemical bonding and melting point of the substance are not affected by melting because it is a physical change (process) in which the same substance is present before and after.

Since atoms in solids are arranged farther apart, their density in liquids is often lower.

Atoms and molecules move more quickly in liquids due to their increased energy.

In liquids, intermolecular bonds are weaker.

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Answer:

The atomic number is the number of protons in the nucleus of an atom . The number of protons define the identity of an element

Answer:

b)6.2 grams

Explanation:

Recall that percentage yield =

actual yield/theoretical yield * 100/1

theoretical yield = 8.2 grams

percentage yield = 75%

Let the actual yield be x

Hence;

75 = x/8.2 * 100

75 = 100x/8.2

75 * 8.2 = 100x

x = 75 * 8.2/100

x = 6.15 g

x = 6.2 g

75 =

Answer:

c

Explanation:

h

Answer:

nitrogen, oxygen and fluorine

A sense strand is the mRNA strand that is translated from a DNA strand with a same nucleotide sequence. the codons have specific functions when the mRNA sequence is translated into a protein.

The DNA sequence serves as a template for the synthesis of a complementary mRNA molecule during transcription. The nucleotide arrangement of the DNA template strand dictates the sequencing of the mRNA. The mRNA sequence is not identical to the template DNA strand; rather, it is complementary to it. RNA polymerase, which builds the mRNA molecule on the DNA template strand, adds complementary RNA nucleotides to the lengthening mRNA chain. Since RNA nucleotides have uracil (U) as a base instead of thymine (T), the mRNA sequence will have the same nucleotide sequence as the DNA template strand. The mRNA sequence is read in groups of three nucleotides called codons, and the codons have specific functions when the mRNA sequence is translated into a protein.

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Sodium is a group 1 element with atomic number 1. It has 11 electrons. It is soft reactive metal. It has 1 valence electron.

Fluorine is a group 7 element, a hologen with 7 valence electron. It is a most reactive non metal.

When sodium react with fluorine, ionic bond is formed in the resulting compound sodium fluoride.

One sodium and fluorine each totaling 2 atoms are enough to make the bond.

As the bond is formed, both atoms have octet structure. That is they each have 8 electrons on their outermost shells.

The positive charge on sodium indicates that sodium had lost 1 electron to fluorine atom.

The negative charge on fluorine ion indicates that fluorine atom had gained 1 electron from sodium atom to form negative ion.

The name of the compound is sodium fluoride with formula NaF.

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According to the research, the correct option is false, the statement related to a chemical reaction is false.

They are reactions involving two or more substances (reactants), which change significantly in the process, and can consume or release energy.

Every chemical reaction subjects matter to a chemical transformation, altering its structure and molecular composition.

Therefore, we can conclude that according to the research, the correct option is false, the statement related to a chemical reaction is false.

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Total, 0.838 g of AgCl is formed from the reaction of 75.0 ml of a 0.078 m AgC₂H₃0₂ solution with 55.0 ml of 0.109 m MgCl) solution.

The balanced chemical equation for the reaction between AgC₂H₃O₂ and MgCl₂ is;

AgC₂H₃O₂ + MgCl₂ → AgCl + Mg(C₂H₃O₂)₂

To find the mass of AgCl formed, we need to determine the limiting reactant first.

From the balanced chemical equation, we can see that 1 mole of AgC₂H₃O₂ reacts with 1 mole of MgCl₂ to produce 1 mole of AgCl. Therefore, we can use the following equation to determine the number of moles of AgCl formed;

moles of AgCl = (volume of AgC₂H₃O₂ solution in L) x (molarity of AgC₂H₃O₂ solution) x 1 (since the stoichiometry is 1:1:1)

moles of AgCl = (75.0 mL x 1 L/1000 mL) x (0.078 mol/L) x 1 = 0.00585 mol

moles of MgCl₂ = (volume of MgCl₂ solution in L) x (molarity of MgCl₂ solution)

moles of MgCl₂ = (55.0 mL x 1 L/1000 mL) x (0.109 mol/L)

= 0.0060 mol

Based on the stoichiometry of the balanced chemical equation, we can see that AgC₂H₃O₂ is the limiting reactant since it produces less AgCl than MgCl₂.

The molar mass of AgCl is 143.32 g/mol.

mass of AgCl = (moles of AgCl) x (molar mass of AgCl)

mass of AgCl = 0.00585 mol x 143.32 g/mol

= 0.838 g

Therefore, 0.838 g of silver chloride (AgCl) is formed from the reaction.

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Answer:

See explanation

Explanation:

Salt makes ice to melt faster than it usual. Sugar is another substance that influences the melting time of ice.

If i have a sample of pure ice and another sample of ice treated with sugar. I have to maintain the both initially at 0 degrees temperature and have a stop clock to measure the melting time.

I will ultimately notice that the sample of ice treated with sugar will melt faster than the pure sample of ice due to the presence of an impurity.

Answer:

A

Explanation:

2 atoms of aluminum, 3 atoms of sulfur

Aluminum = Al

Sulfer = S

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The formula for 2 atoms of Al and 3 atoms of S is Al₂S₃  and is named  Aluminium Sulphide.

Al has atomic no. =13, S has atomic no.=16

So the valencies of the given elements are

Al⁺³ and S⁻² to attain the noble gas configuration.

Al⁺³↘ ↙S⁻³

                  Al₂S₃

Cross multiply the valancies for the formation of molecular formula.

Hence, the formula is Al₂S₃.

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In the equation, 4 moles of antimony react with 3 moles of oxygen to form 2 moles of antimony oxide. Therefore, when 20 moles of oxygen are present,

20/3 = 6.66 moles of antimony oxide will be formed.

In the given chemical equation, for every 3 moles of oxygen (O2), 2 moles of antimony oxide (Sb2O3) are produced. Therefore, to determine the number of moles of Sb2O3 that will be formed from 20.0 moles of O2, we can use the conversion factor between moles of O2 and moles of Sb2O3. To do this, we divide the number of moles of O2 by the coefficient of O2 on the reactant side of the equation, which is 3. So 20.0 moles O2 / 3, moles O2/1 mole Sb2O3 = 6.66 moles of Sb2O3 will be formed.

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Answer:

Solid---> Liquid

Answer:

D:2

Explanation:

H is hydrogen, and the subscript represents the amount of atoms it has so H2SO is two hydrogens

Answer:

D. 2 I think, not 100% sure.

1. Hydrohalogenation: In this reaction, an alkene reacts with HI (hydroiodic acid), and the hydrogen (H) from HI adds to one carbon of the double bond, while the iodine (I) adds to the other carbon. This results in the formation of an alkyl iodide. The addition follows Markovnikov's rule, which means that the hydrogen will attach to the carbon with more hydrogen atoms, while the iodine will attach to the carbon with fewer hydrogen atoms.

2. Nucleophilic substitution: When HI reacts with an alkyl halide, the iodide ion (I-) from HI acts as a nucleophile and replaces the existing halogen atom on the alkyl halide, resulting in the formation of a new alkyl iodide.

To summarize, the two major organic products of the reaction involving HI as an HX reagent are:
1. Alkyl iodides formed through hydrohalogenation of alkenes
2. Alkyl iodides formed through nucleophilic substitution of alkyl halides.

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A) F2 and C2H5OH (Heterogeneous mixture)B) H2O and CH3OH (Homogeneous mixture)C) LiCl and C10H20 (Heterogeneous mixture)D) CH4 and C2H5OH (Heterogeneous mixture).

The pair of substances that are most likely to form a homogeneous solution is B. H2O and CH3OH. A homogeneous mixture is one in which the components are evenly distributed throughout the mixture. These types of solutions have uniform properties and the same composition throughout.A heterogeneous mixture is one in which the components are not evenly distributed. This means that the mixture has distinct regions or phases that are visibly different from one another. The following are the most likely pairs of substances to form a homogeneous solution:A) F2 and C2H5OH (Heterogeneous mixture)B) H2O and CH3OH (Homogeneous mixture)C) LiCl and C10H20 (Heterogeneous mixture)D) CH4 and C2H5OH (Heterogeneous mixture).

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Answer:

D

\( \: \: \: \: \)

The standard additions method is best used over the external standards method under conditions where the sample matrix has a significant impact on the analytical signal, leading to potential inaccuracies in the calibration curve.

These conditions often involve complex sample matrices, interfering substances, or when the analyte is present in a very low concentration.
In the standard additions method, known amounts of the analyte are added to the sample, and the increase in the analytical signal is measured. This method compensates for matrix effects and provides a more accurate determination of the analyte concentration.
On the other hand, the external standards method involves creating a calibration curve using a series of standard solutions, which are analyzed separately from the sample. This method assumes that the matrix effects are negligible or constant for all samples and standards. If this assumption doesn't hold true, the standard additions method is a more reliable choice.

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In summary, the standard additions method is preferred over the external standards method when dealing with matrix effects, limited sample availability, or unknown interfering substances. This method helps to improve the accuracy of the measurement by compensating for these factors.

It's best to use the standard additions method over the external standards method under the following conditions:

1. Matrix effects are present: When the sample matrix affects the analytical signal, standard additions can help account for these effects by spiking the sample with known concentrations of the analyte.

2. Limited sample availability: If you have a limited amount of sample, standard additions allow you to measure the analyte concentration in the same sample without preparing separate calibration standards.

3. Unknown interfering substances: If there are potential interfering substances present in the sample, standard additions can help minimize their impact on the analysis.

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Answer:

100x less acidic

Explanation:

pOH is the inverse of pH, which is a measure of the acidity or basicity of a solution. The lower the pH of a solution, the more acidic it is, and the higher the pOH, the less acidic it is.

To determine how many times more acidic a solution with a pOH of 12 is compared to a solution with a pOH of 10, we can use the formula:

pH1 / pH2 = 10^(pOH1 - pOH2)

In this case, we are given that the pOH of the first solution is 12 and the pOH of the second solution is 10. We can plug these values into the formula to calculate the ratio of acidity:

pH1 / pH2 = 10^(12 - 10)

= 10^2

= 100

Therefore, a solution with a pOH of 12 is 100 times less acidic than a solution with a pOH of 10.