What nuclide is formed when th-230 undergoes alpha emission?
a) au-226
b) pb-226
c) ra-230
d) ra-226
e) pa-230

Answer:

CH4 + 2 O2 → CO2 + 2 H2O

Explanation:

There are one mole of O2 on the left side and on the right side there are three moles of O2. And to fix it you would need to make it two moles of O2 to have four molecules of O2 on the left side. Then you would make two moles of H2O to have a total of four moles of O2 on the right. Therefore, CH4 + 2 O2 → CO2 + 2 H2O is the answer.

Answer:

1,2,1,2

Explanation:

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First of all, Z is unknown. I hope it is a mistake.

        Now, it is given that the element X has nineteen electrons. This proves that X is actually Potassium.

        As per the periodic table, both Potassium and Lithium belongs to group 1 as their valency is 1 because of the presence of only one electron in the outermost shell of electrons i.e., they lose an electron during a chemical reaction to form a stable compound. Furthermore, both are metallic.

        Magnesium belongs to group 2 and hence its valency is two, which is different from potassium though it is metallic. Similiarly, bromine belongs to group 17 and gains one electron during a reaction in contrast to potassium.

( No internal links available for reference. For clarification, check the periodic table).

According to Gay-Lussac's law,  the temperature of the fire at 39.3 atmospheres is 1350.82 Kelvin.

It is defined as a gas law which states that the pressure which is exerted by the gas directly varies with its temperature and at a constant volume.The law was proposed by Joseph Gay-Lussac in the year 1808.

The pressure of the gas at constant volume reduces constantly as it is cooled till it undergoes condensation .It is given as, P₁/T₁=P₂/T₂, thus T₂= 295.6×39.3/8.6=1350.82 kelvin

Thus, the temperature of the fire at 39.3 atmospheres is 1350.82 Kelvin.

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The repeating monomer unit of polyglycine is shown below:

\(H_{2}N-CH_{2}-CO-\\\\\)

The repeating monomer unit of polyglycine is simply the amino acid glycine itself. This represents one glycine molecule, with an amine group at one end and a carboxylic acid group at the other end. When glycine molecules are linked together through peptide bonds, the amine group of one molecule reacts with the carboxylic acid group of another, releasing a molecule of water and forming a peptide bond (-CO-NH-). This process is repeated to form the polymer polyglycine.

When glycine monomers undergo condensation polymerization, the carboxyl group of one glycine molecule reacts with the amino group of another glycine molecule, forming a peptide bond and releasing a water molecule. This process is repeated for each additional glycine monomer that is added to the growing polymer chain.

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Answer:

the force needed to produce the same acceleration is 480kg

Answer:

H2C2O1

Explanation:

Answer:

Carboxylic Acid

Ester

Ether

Alcohol

Explanation:

Explanation:

This is most likely a trick question as oxygen do not react with CO2.

Two months later 13.8 milligrams of the barium-131 still be radioactive.

It is expressed as:

\(A = A_{0} \times (\frac{1}{2})^{t/T}\)

where,

A = Amount remaining

A₀ = Initial Amount

t = time

T = Half life

Here

A₀ = 0.50g

t  = 2 months = 60 days

T = 11.6 days  

Now put the values in above expression we get

\(A = A_{0} \times (\frac{1}{2})^{t/T}\)

   \(= 0.50 \times (\frac{1}{2})^{60/11.6}\)

   \(= 0.50 \times (\frac{1}{2})^{5.17}\)

   = 0.50 × 0.0277

   = 0.0138 g

   = 13.8 mg          [1 mg = 1000 g]

Thus from the above conclusion we can say that Two months later 13.8 milligrams of the barium-131 still be radioactive.

Disclaimer: The question was given incomplete on the portal. Here is the complete question.

Question: Suppose that 0.50 grams of ban that 0.50 grams of barium-131 are administered orally to a patient. Approximately many milligrams of the barium would still be radioactive two months later? The half-life of barium-131 is 11.6 days.

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Answer:

Explanation:

Repeated tests help determine whether the hypothesis is always true in different circumstances. Repeatedly testing a hypothesis qualifies it to be accepted as a theory.

"Hypotonic solution," refers to a solution with the highest water concentration due to its lower solute concentration compared to the other options, leading to water influx into cells.

A hypotonic solution would be most likely to have the highest water concentration. In a hypotonic solution, the solute concentration is lower than that inside the cell or compared to another solution. As a result, water tends to move into the cell or the solution to equalize the concentration.

When a cell is placed in a hypotonic solution, water molecules will move into the cell through the process of osmosis. This influx of water increases the water concentration inside the cell, leading to cell swelling or even bursting in extreme cases.

Compared to hypertonic and isotonic solutions, a hypotonic solution has a lower solute concentration, allowing for a higher concentration of water molecules. This results in a higher water concentration in the solution. It's important to note that the concept of tonicity is related to the relative solute concentrations between two solutions and their effect on cell osmosis. In this case, a hypotonic solution is characterized by a higher water concentration compared to the other options.

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Answer:

If a metal is less reactive than carbon, it can be extracted from its oxide by heating with carbon. The carbon displaces the metal from the compound, and removes the oxygen from the oxide. This leaves the metal.

Explanation:

A formula for the sensitivity dR/dM  represents the sensitivity of the body's reaction to the medication. It shows how the reaction changes with respect to the dose of the medication, M. The term M*C represents the contribution of the constant C to the sensitivity, while the term \((2M^2)/3\) represents the contribution of the dose M itself.

To find a formula for the sensitivity, dR/dM, let's differentiate the given function R(M) with respect to M.

Step 1: Start with the function \(R(M) = M^2(C/2 - M/3).\)

Step 2: Apply the power rule of differentiation to differentiate M^2. The power rule states that if

\(f(x) = x^n, then f'(x) = n*x^(n-1). \\\)

n this case, n = 2.

\(dR/dM = 2M^(2-1)*(C/2 - M/3).\)

Simplifying, we have:

\(dR/dM = 2M*(C/2 - M/3).\)

Step 3: Distribute the 2M to each term inside the parentheses:

\(dR/dM = M*C - (2M^2)/3.\)

This formula represents the sensitivity of the body's reaction to the medication, dR/dM. It shows how the reaction changes with respect to the dose of the medication, M. The term M*C represents the contribution of the constant C to the sensitivity, while the term \((2M^2)/3\) represents the contribution of the dose M itself.

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the formula for the sensitivity, or the rate of change of the reaction R with respect to the dose M, is

dR/dM = MC - M\(^2^/^3\)

We calculate the derivative of the reaction function R(M) with respect to M.

the reaction function: R(M) = M²(C/2 - M/3)

We will apply  the power rule and the constant multiple rule of differentiation,

dR/dM = d/dM [M²(C/2 - M/3)]

= 2M(C/2 - M/3) + M²(0 - (-1/3))

= 2M(C/2 - M/3) + M\(^2^/^3\)

dR/dM =\(MC - 2M^2^/^3 + M^2^/^3\)

= \(MC - M^2^/^3\)

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Answer:

15 moles of hydrogen gas are needed to react with 15 moles of chlorine gas.

Explanation:

The balanced reaction is:

H₂ (g) + Cl₂ (g) → 2 HCl (g)

By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of the compounds participate in the reaction:

Then you can apply the following rule of three:  If 1 mole of Cl₂ reacts with 1 mole of H₂, 15 moles of Cl₂ with how many moles of H₂ does it react?

\(moles of H_{2} =\frac{15 moles of Cl_{2} *1mole of H_{2}}{1moles of Cl_{2}}\)

moles of H₂= 15

15 moles of hydrogen gas are needed to react with 15 moles of chlorine gas.

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\(n = \frac{N}{L} \\\)

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

\(n = \frac{9.20 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 15.282392..\)

We have the final answer as

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992 millimoles of zinc nitrate the chemist has added to the reaction flask.

Zinc nitrate is an inorganic compound with the formula Zn(NO₃)₂. This colorless, crystalline salt is extremely hydrophilic. it's generally encountered as a hexahydrate Zn(NO₃)₂·6H₂O. it's soluble in each water and alcohol. Zn Nitrate may be a colorless or white, odorless, crystalline (sand- like) solid or flake. it's used as a catalyst and a mordant for dyes, and in liquid plant food.

Chemists and materials scientists study substances at the atomic and molecular levels and analyze the ways that within which the substances move with each other. They use their information to develop new and improved product and to check the standard of factory-made product.

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A chemist adds 435.0mL of a 2.28 M zinc nitrate ZnNO32 solution to a reaction flask. Calculate the millimoles of zinc nitrate the chemist has added to the flask. Round your answer to 3 significant digits.

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Answer:

This illustrates Boyle's law, which states that a gas expands if the pressure decreases while all other variables are kept constant. When heating a marshmallow in a microwave, some moisture inside the marshmallow evaporates, adding gas to the bubbles. In addition, a warmer gas pushes outward with more force.

Explanation:

From the idea of the Bohr model, each of the electrons would emit a characteristic  wavelength thus four wave lengths are emitted.

We know from the Bohr model that when an electron jumps from a higher to a lower energy level, there is the emission of light of the appropriate wavelength.

Now we know that the energy that is evolved is what determines the wavelength of the light since the wavelength is inversely proportional to the energy that is evolved by the electronic transition.

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Answer:

Electrons accelerated to high velocities travel in straight lines through an empty cathode ray tube and strike the glass wall of the tube, causing excited atoms to fluoresce or glow.

Explanation:

To calculate the hydronium ion concentration ([H3O+]) of a polyprotic acid solution, we need to consider the acid dissociation constants and the concentrations of the acid species.

H3C6H5O7, also known as citric acid, is a polyprotic acid with three dissociable protons. The dissociation reactions and their corresponding acid dissociation constants (Ka values) are as follows:

H₃C₆H₅O₇ ⇌ H⁺ + H₂C₆H₅O₇⁻ (Kₐ₁)

H₂C₆H₅O₇⁻ ⇌ H⁺ + HC₆H₅O₇²⁻ (Kₐ₂)

HC₆H₅O₇²⁻ ⇌ H⁺ + C₆H₅O₇³⁻ (Kₐ₃)

Given that the concentration of H₃C₆H₅O₇ is 0.125 M, we can assume that the initial concentrations of HC₆H₅O₇²⁻, HC₆H₅O₇²⁻, and C₆H₅O₇³⁻ are negligible compared to the concentration of the undissociated acid.

In the case of citric acid, the first dissociation (Kₐ₁) is the dominant one. Therefore, we can simplify the calculation by assuming that all of the H₃C₆H₅O₇ will dissociate into H⁺ and H₂C₆H₅O₇⁻. This means that the concentration of H⁺ ions is equal to the concentration of H₃C₆H₅O₇.

Therefore, the [H₃O⁺] concentration of the 0.125 M H₃C₆H₅O₇ solution is 0.125 M.

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Answer:

She wouldn't produce proper insulin

Explanation:

Diabetes is a diasese in which blood cells and fat cells are effected but it's worse on the blood cells because the bloods cells don't produce and revive enough insulin

The shaking caused the temperature of the sand to rise because hey should notice an increase in sand temperature as the kinetic energy increases. This is due to the fact that the kinetic energy from their shaking is being converted to thermal energy in the sand.

The sand is a poor heat conductor because when the Sun warms it, the heat is not distributed evenly, making the surface hot. Also, because sand has a lower specific heat than water, when both are exposed to the same amount of light, the sand at the surface will experience a greater change in temperature.

When you rub your hands together, the action of scraping the surface of your skin back and forth against each other causes the molecules in your skin to move a little faster.

The faster that molecules move, the higher the temperature. So the friction of rubbing your hands together makes them feel warmer.

Thus, when you shake the sand the molecules move faster to make the temperature warmer.

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Science is a systematic study of the universe. Option C

Science is a systematic study of the universe. We know that science involves the observance of the occurrences of the universe and the formulation of hypothesis that explain them. These hypothesis can now be con firmed or disproved by the use of experiments.

Thus, the branch of knowledge and the systematic study of the universe and all it encompasses, one that is based upon facts, observation, and experimentation is science Option C.

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We have that this how they differ

Physical properties

Chemical Properties

From the Question we are told that

Silicon properties:

a. blue-gray color

b. brittle

c. doesn't dissolve in water

d. melts at 1410°C

e. reacts vigorously with fluorine

Physical properties

This Refer to Properties that can be seen and  Measured

While

Chemical Properties

This are Refers to the effect of the element in reactions

Therefore

Physical properties

Chemical Properties

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When sulphide ore is roasted the sulphide ores generally gets converted to their respective oxides and the impurities are also oxidised and removed.

Generally roasting is defined as the process in which the mainly sulphide ores are heated below their melting point in presence of air. The sulphide ores are converted to their respective oxides and the impurities are also oxidized and removed.

During the process of roasting, the ore or the ore concentrate is treated with very hot air. Roasting is the process that is generally applied to sulfide minerals. During the process of roasting, the sulfide ore is usually converted to an oxide, and sulfur is released as sulfur dioxide, a gas.

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True. Injured individuals can rely on the common law to obtain damages and injunctions against business polluters.

The common law refers to the body of law that is developed through court decisions rather than legislation. In the context of environmental pollution caused by businesses, individuals who have suffered harm or injury due to such pollution may seek remedies under the common law.

Under the common law, individuals have the right to bring lawsuits against polluting businesses and seek damages for the harm caused. Damages can include compensation for medical expenses, property damage, loss of income, and other relevant losses resulting from the pollution. If the court finds the polluting business liable for the harm, it may order the payment of damages to the injured individuals.

Additionally, injunctions can also be sought under the common law. An injunction is a court order that requires the polluting business to stop or limit its harmful activities. In cases where ongoing pollution poses a threat to public health or the environment, injured individuals can seek injunctive relief to prevent further harm.

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Answer:

1. can conduct heat and electricity.

2. are solid in room temperature except mercury.

3. they are malleable

Answer:

kim loại phổ biến nhất có thể như sắt (e), nhôm  (Al), đồng (Cu), vàng (Au), bạc (Ag), Kẽm (Zn)…

Explanatio:

Answer:

Carbon atoms can form double bonds by sharing two pairs of electrons; they can also form triple bonds by sharing three pairs of electrons.

Carbon atoms can form double bonds by sharing two pairs of electrons; they can also form triple bonds by sharing three pairs of electrons.

An organic compound is any of a large class of chemical compounds in which one or more atoms of carbon are covalently linked to atoms of other elements, most commonly hydrogen, oxygen, or nitrogen.

A carbon atom can participate in a maximum of four bonds; either four single bonds, two single bonds and a double bond, or one single bond and a triple bond.

A double bond is formed when two atoms use two electron pairs to form two covalent bonds; a triple bond results when two atoms share three electron pairs to form three covalent bonds.

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Darwinism holds that natural selection, inheritance of variations, survival of the fittest, and struggle for existence are the proper order of events leading to the genesis of species. According to Darwin, nature is characterized by a constant "battle for survival" in which only the strongest will survive.

Natural selection, as defined by Charles Darwin, is the differential survival and reproduction of individuals as a result of phenotypic differences. The shift in the heritable characteristics of organisms is a crucial mechanism of evolution.

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