which radioisotope is naturally occurring? 53131i 96242cm 102254no 93239np

The conductivity of metalloids can be compared to the conductivity of metals and nonmetals because metalloids conduct electricity better than nonmetals, but not as well as metals (Option C).

The expression metalloids is a term used to denote chemical elements that have features resembling metals such as an acceptable electrical conductivity, but they are not metals (e.g. boron, germanium, antimony, arsenic, polonium, etc).

Therefore, with this data, we can see that metalloids are similar to metals in electrical conductivity but they are not metals because they do not fit all properties of metals.

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The missing variable of (⁻¹) is bromine.

Let the missing variable be X.

No. of electrons in the monoatomic anion (X⁻¹ )= 36

No. of electrons in the monoatomic atom (X) = 35

Atomic No. = No. of protons = No. of electrons in neutral atom = 35

Mass No. = No. of protons + No. of neutrons

               = 35 + 45 = 80

Hence, the element must be Br as its mass no is 80 and atomic no is 35.

And the ion is bromide ion or Br⁻¹ ion. It is an anion which gains an electron to achieve octet.

X → Br and X⁻¹ → Br⁻¹

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Answer:

all are correct

Explanation:

AI Consist of 3 valence electrons we would make all tree images correct

Answer:

8M

Explanation:

Molar Concentration = moles of solute / litres of solution

Converting units:

250cm^3 = 0.25L

Substituting;:

Molar Concentration = moles of solute / litres of solution

Molarity = 2 / 0 25

Solving:

Molar Concentration = 2 / 0.25

Molar Concentration = 8

Molar Concentration = 8M

(M is molar)

Answer:

1.31M

Explanation:

Based on the reaction, 1 mole of Zn produce 1 mole of ZnCl₂. As the reaction occurs completely, the moles of Zn added = Moles of ZnCl₂ produced. To find molarity we need the moles of ZnCl₂ and the volume of the solution in liters:

Moles Zn = Moles ZnCl₂ -Molar mass Zn: 65.38g/mol-:

15g * (1mol / 65.38g) = 0.23 moles of ZnCl₂

Volume in Liters:

175mL * (1L / 1000mL) = 0.175L

The molarity is:

0.23moles / 0.175L

An example which doesn't depict physical weathering is acid rain falling on limestone.

Physical weathering involves the breakdown of rock into smaller particles through physical processes such as friction between rocks as a result of wind blowing sand onto rocks, freeze-thaw in colder climates etc and it is usually reversible.

Chemical weathering on the other hand involves the  breakdown of rock into smaller particles through chemical processes or reaction  such as acid rain falling on limestone and it is usually irreversible.

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Answer:

B. 16g

Explanation:

Answer:

A) True

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After 20 days, there will be approximately 2.5 grams of the substance left.

The half-life of a radioactive substance is the time it takes for half of the initial quantity of the substance to decay. In this case, the half-life is given as 10 days.

Since the half-life is 10 days, after 10 days, half of the initial quantity will remain. Therefore, after 20 days, two half-lives will have passed, and we can calculate the amount of substance left as follows:

After 10 days: 10 grams / 2 = 5 grams remaining

After another 10 days: 5 grams / 2 = 2.5 grams remaining

Therefore, after 20 days, there will be approximately 2.5 grams of the substance left.

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Answer:

Synthesis

Explanation:

Nothing else works

Answer:

32

Explanation:

Answer:

Carbon is released back into the atmosphere when organisms die, volcanoes erupt and even when fossils are buried

A 0.200 M K₂SO₄ solution has a freezing point of −0. 53°C. Van't Hoff factor for this solution is 1.42.

The van't Hoff factor can be calculated using the formula ΔTf = i Kf m, where ΔTf is the change in freezing point, i is the van't Hoff factor, Kf is the freezing point depression constant, and m is the molality of the solution. Rearranging the formula to solve for i gives:

i = ΔTf / (Kf × m)

Plugging in the given values:
i = (−0.53°C) / (1.86°C/m × 0.200 m)
i = −0.53°C / 0.372°C
i = 1.42

Therefore, the van't Hoff factor is 1.42.

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Answer:

2.0 liters of oxygen gas.

Explanation:

To determine the volume of oxygen gas required to completely combust a given amount of propane, we need to know the chemical equation for the combustion of propane. The combustion of propane can be represented by the following equation:

Propane + Oxygen → Carbon Dioxide + Water

According to the balanced chemical equation, it takes two molecules of oxygen gas to completely combust one molecule of propane. Therefore, to completely combust 1.0 liters of propane at standard temperature and pressure (STP), we would need 2.0 liters of oxygen gas.

When a reaction has reached equilibrium with a given set of conditions, if the conditions are not changed, the reaction will remain at equilibrium forever. The forward and reverse reactions continue at the same equal and opposite rates and the macroscopic properties remain constant.

It is possible, however, to disturb that equilibrium by changing conditions. For example, you could increase the concentration of one of the products, or decrease the concentration of one of the reactants, or change the temperature. When a change of this type is made within a reaction at equilibrium, the reaction is no longer in equilibrium. When you alter something in a reaction at equilibrium, chemists say that you put stress on the equilibrium. When this occurs, the reaction will no longer be in equilibrium and the reaction itself will begin changing the concentrations of reactants and products until the reaction comes to a new position of equilibrium. How a reaction will change when a stress is applied can be explained and predicted. That is the topic of this section.

Based on the provided information, the statement that is accurate about benzene is that it must be kept away from flames. This is because benzene has a high flammability rating of 3, which indicates that it can ignite and burn easily.

Additionally, the MSDS states that benzene has a substantial vapor pressure, which means it can easily evaporate into the air and form flammable mixtures with air.

The other statements are not accurate. Benzene does not readily react with moist air or explode if the container is shaken. It also does not need to be stored under high pressure. However, benzene is a cancer-causing agent, so it is important to handle it with care and follow proper safety precautions.

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Answer:

121.67 g is to be added to 500 g of water

Explanation:

Given that:

Pressure = 750 mmHg

Temperature T₁= 99.63⁰C = (273 + 99.63 ) = 372.63K

mass of water = 500 g

Temperature T₂  = 100⁰C = ( 273 + 100) K = 373 K

where;

Kb for water 0.52 K Kg mol-1

For sucrose; C₁₂ H₂₂ O₁₁

Molar mass =  ( 12 × 12 )+ ( 1 × 22 ) + ( 16 × 11 )

Molar mass = 342 g/mol

ΔT = T₂  - T₁

ΔT = (373 - 372.63)K

ΔT = 0.37 K

∴ the amount of sucrose to be added to  500 g of water is:

 \(= \dfrac{0.37\times 342 \times 500}{0.52 \times 1000 }\)

\(= \dfrac{6327}{52}\)

= 121.67 g

Thus; 121.67 g is to be added to 500 g of water

Answer:

Option B

Explanation:

Use Avogadro constant of 6.02 x 10^23

For Option A,

1.9 moles x (6.02 x 10^23) = 1.1438 x 10^24

For Option B,

5.3 moles x (6.02 x 10^23) = 3.1906 x 10^24

For Option C,

9.5 moles x (6.02 x 10^23) = 5.719 x 10^24

For Option D,

19.2 moles x (6.02 x 10^23) = 1.1558 x 10^25

Therefore, the nearest one to 3.2 x 10^24 is Option B

An element with seven valence electrons is likely to form one or two chemical bonds, as it will either gain or lose one electron to achieve a stable configuration of eight valence electrons.

This process of gaining or losing electrons is known as chemical bonding, which is the attraction between two or more atoms that results in the formation of a new compound. In the case of an element with seven valence electrons, it will typically bond with another element that has one or two valence electrons to achieve a full outer shell. This could lead to the formation of a covalent or ionic bond, depending on the electronegativity of the elements involved.

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The planet's albedo has ability to reflect light.

The planetary albedo would be the percentage of incoming solar radiation that Earth scatters back into space. The processes that control the quantity, distribution, and fluctuation of this reflected energy are crucial to the Earth's energy balance and have a significant impact on both climate including climate change.

Temperatures rise as a result of carbon dioxide, prolonging the growing season as well as raising the humidity. Each of these elements has stimulated some further plant growth. But hotter weather also stresses plants. Plants require more water to live in an extended, warmer growing season.

Therefore,  the planet's albedo has ability to reflect light.

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The given statement " Concentration of hydroxide ion in aqueous solution can be determined by titration with a standard acid solution " is true as the concentration of base can be determined by the titration of the strong acid.

The concentration of the basic solution can be determined by the titration of the strong acid. First, we have to determined the number of the moles of the strong acid which is required and will reach the equivalence point for the titration. After this the mole ratio in the balanced neutralization equation, will be convert from the moles of the  base to the moles of the strong acid.

The titration is the process of the chemical analysis to determined the concentration of the unknown solution.

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One example of particles that can be drawn closer to occupy a smaller volume is a gas.

In the gaseous state, particles have high kinetic energy and are not strongly attracted to each other. They move freely and randomly, colliding with each other and the container walls.

Since there are minimal intermolecular forces holding them together, gas particles can be compressed or drawn closer together by reducing the volume of the container.

By decreasing the volume of a gas, such as by compressing it in a cylinder or container, the particles have less space to move around. They collide with each other more frequently, increasing the frequency of intermolecular collisions. As a result, the gas particles are drawn closer together, and the overall volume occupied by the gas decreases.

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Answer:

Radio waves

Explanation:

Radio waves, on the other hand, have the lowest energies, longest wavelengths, and lowest frequencies of any type of EM radiation. In order from highest to lowest energy, the sections of the EM spectrum are named: gamma rays, X-rays, ultraviolet radiation, visible light, infrared radiation, and radio waves.

The question pertains to physical chemistry and involves the determination of the Henry's law constant for oxygen dissolving in water based on the concentration of dissolved oxygen in water at a given temperature and pressure, as well as the mole fraction of oxygen in air.

Henry's law is a fundamental principle of physical chemistry that relates the concentration of a gas in a solution to the partial pressure of the gas above the solution. The Henry's law constant is a proportionality constant that relates the concentration of a gas in a solution to its partial pressure. In this case, the Henry's law constant for oxygen can be determined using the concentration of dissolved oxygen in water at a given temperature and pressure, as well as the mole fraction of oxygen in air, which is known to be 0.21.

Understanding physical chemistry is important in many areas of science and engineering, including materials science, chemical engineering, and environmental science, as it allows for the prediction and optimization of chemical and physical processes and systems.

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The Henry's Law constant for oxygen dissolving in water at 20°C and 1 atm is 0.00625 mol/(L·atm).

To calculate the Henry's Law constant for oxygen dissolving in water, we'll need to follow these steps:

1. Convert the mass of oxygen (42 mg) to moles.
2. Calculate the molar concentration of oxygen in water.
3. Find the partial pressure of oxygen using the mole fraction.
4. Apply Henry's Law to calculate the constant.

Step 1: Convert mass of oxygen to moles
Given: Mass of oxygen = 42 mg = 0.042 g
Molar mass of oxygen (O2) = 32 g/mol
Moles of oxygen = mass / molar mass = 0.042 g / 32 g/mol = 0.0013125 mol

Step 2: Calculate the molar concentration of oxygen in water
Volume of water = 1 L = 1,000 mL
Molar concentration = moles / volume = 0.0013125 mol / 1,000 mL = 0.0013125 mol/L

Step 3: Find the partial pressure of oxygen using the mole fraction
Mole fraction of oxygen in air = 0.21
Total pressure = 1 atm
Partial pressure of oxygen = mole fraction × total pressure = 0.21 × 1 atm = 0.21 atm

Step 4: Apply Henry's Law to calculate the constant
Henry's Law: C = kH × P
Where C is the molar concentration,
kH is the Henry's Law constant, and
P is the partial pressure of oxygen.

Rearrange the formula to solve for kH: kH = C / P
kH = 0.0013125 mol/L / 0.21 atm = 0.00625 mol/(L·atm)

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Explanation:

Percentage composition of oxygen = (80/134) * 100% = 59.7%.

³⁷Ca and ⁴₂He is the notation of a radioisotope that is correctly paired with the notation of its emission particle.

Generally, radioisotope is defined as an unstable form of a chemical element that releases radiation as it breaks down and becomes more stable. Basically, radioisotopes may occur in nature or be made in a laboratory. Generally, in medicine, they are used in imaging tests and in treatment and it is also called radionuclide.

Generally, uranium is the best known example of a naturally-occurring radioisotope. All but 0.7 per cent of naturally-occurring uranium occurs as uranium-238 while the rest is the less stable, or more radioactive, uranium-235, which has three fewer neutrons in its nucleus.

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The equation related to reaction between Sulfur dioxide and oxygen to produce sulfur trioxide is 2SO\(_2\)(g) + O\(_2\)(g) \(\rightarrow\) 2SO\(_3\) (g).  SO\(_2\)  is limiting reagent.

The reactant that controls how much of the products are generated inside a chemical reaction is known as the limiting reagent. Since some of the other reactants remain that after limiting reagent has been used fully, it is occasionally discovered that they are in excess in the reactions. The theoretical yield is the most product that can theoretically be produced.

2SO\(_2\)(g) + O\(_2\)(g) \(\rightarrow\) 2SO\(_3\) (g)

moles of SO\(_2\) =20.0 g / 64.07

                      =0.312moles

moles of O\(_2\)= 15.6 g/32

                   =0.487moles

On dividing the moles by stoichiometry, out of  O\(_2\) and SO\(_2\), SO\(_2\)  is limiting reagent.

Therefore,  the equation related to reaction between Sulfur dioxide and oxygen to produce sulfur trioxide is 2SO\(_2\)(g) + O\(_2\)(g) \(\rightarrow\) 2SO\(_3\) (g).  SO\(_2\)  is limiting reagent.

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Answer:

vigorous reaction will occur giving rise of heat as it is an exothermic reaction. If heat is applied then it should be more vigorous.

Reaction is as follows:

Mg(s) + HCl(aq) --> MgCl2(aq) + H2(g)

Magnesium reacts easily withHCl to produce H2 gas and magnesium ions, Mg2+, and heat. The reaction isexothermic, so it heats up quickly.

Mg(s) + HCl(aq) --> MgCl2(aq) + H2(g)

The net ionic equation :

Mg(s) + 2H+ --> Mg2+ + H2(g)

If water is removed from the solution then white crystals of Mgcl2 is obtained.

NaCl has an electron configuration of 1s22s22p63s1. Its electrical configuration is the arrangement of electrons within an atom's orbitals.

An essential element of a totality. In chemistry, a simple substance is one that cannot be divided into smaller components or transformed into another substance. An element's fundamental building block is an atom, which is made up of protons, neutrons, & electrons. The number of protons in an element's atoms is constant.

Every material that cannot be reduced to a condensed manner is considered to be an element. Their distinctive atomic number serves as an identifier. The table, which highlights atoms with comparable qualities, arranges the elements according to their atomic number.

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