Select the correct answer. Based on the reactivities of the elements involved, which reaction will form products that are more stable than the reactants? A. 2AlBr3 + 3Zn → 3ZnBr2 + 2Al B. CaBr2 + 2Na → 2NaBr + Ca C. MgBr2 + H2 → 2HBr + Mg D. BaBr2 + Ca → CaBr2 + Ba E. 2LiBr + Ba → BaBr2 + 2Li Reset Next Post Test: Chemical Reactions

Answer is: nuclear chain reaction.

For example fission of heavy isotope uranium-238.

The decay chain of ²³⁸U is called the uranium series.

Decay start with U-238 and ends with Pb-206. There are several alpha and beta minus decays.

The half-life for the radioactive decay of U-238 is 4.5 billion years and is independent of initial concentration.

Alpha decay is radioactive decay in which an atomic nucleus emits an alpha particle (helium nucleus) and transforms into an atom with an atomic number that is reduced by two and mass number that is reduced by four.

In beta minus decay atomic number Z is increased by one, neutron is converted to a proton and an electron and an electron antineutrino.

Final answer:

When a substance does not dissolve in another substance, it is termed insoluble. Immiscible refers specifically to two liquids that do not mix, and solubility is the extent to which a substance dissolves.

Explanation:

When a substance does not dissolve in another substance, it is said to be insoluble. This term applies widely within the context of solutions in chemistry. For instance, sodium chloride is soluble in water but insoluble in hexane (C6H₁₄). Another important term is immiscible, which is used specifically when two liquids do not dissolve into each other, such as oil and water. This contrast with substances described as miscible, which can blend in all proportions to form a homogeneous solution, like ethanol and water. A partially miscible substance, like n-butanol in water, forms a solution only up to a certain concentration. An unsaturated solution can still dissolve more solute, whereas a saturated solution cannot dissolve any additional solute. Ionic compounds that are termed 'insoluble' still dissolve to some extent, just not in a significant enough amount to affect observations.

Potassium dihydrogen phosphate (KH2PO4) and sodium nitrate (NaNO2)

Molecular equation:

KH₂PO₄ (aq) + 3NaNO₂(aq) → Na₃PO₄(s) + KNO₂(aq) + 2HNO₂ (aq)

The net ionic equation is:

3Na⁺(aq) + PO₄⁻(aq) → Na₃PO₄(s)

The rest of the ions are spectator ions and tend to cancel out on both sides of the reaction.

Final answer:

The net ionic equation for the acid-base reaction between KH2PO4 and NaNO2 is 2 Na+(aq) + 2 NO2-(aq) -> 2 NO2-(aq) + 2 Na+(aq).

Explanation:

The net ionic equation for the acid-base reaction between potassium dihydrogen phosphate (KH2PO4) and sodium nitrate (NaNO2) can be determined as follows:

1. Write the balanced molecular equation: 2 KH2PO4 (aq) + NaNO2 (aq) -> 2 KNO2 (aq) + H2PO4 (aq)

2. Write the complete ionic equation, showing the dissociation of the soluble compounds: 2 K+(aq) + 2 H2PO4-(aq) + Na+(aq) + NO2-(aq) -> 2 K+(aq) + 2 NO2-(aq) + H2PO4-(aq)

3. Cancel out the spectator ions (K+ and H2PO4-) to obtain the net ionic equation: 2 Na+(aq) + 2 NO2-(aq) -> 2 NO2-(aq) + 2 Na+(aq)

The net ionic equation for the most likely acid-base reaction between KH2PO4 and NaNO2 is 2 Na+(aq) + 2 NO2-(aq) -> 2 NO2-(aq) + 2 Na+(aq).

Gluteal muscle is the correct answer i believe.

The muscle that connects to the back of the pelvic girdle and the femur is the gluteus maximus which extends and abducts the femur. Other muscles contribute to the movement and stabilization of the hip and thigh. The pelvic girdle and femur have several muscles attached, aiding in various movements at the hip joint.

The muscle that connects to the back of the pelvic girdle and the femur is the gluteus maximus. Located in the gluteal region, this large muscle is primarily responsible for extending and abducting the femur. It is a part of the appendicular muscles of the pelvic girdle and lower limbs, which play a key role in connecting the legs to the axial skeleton and enabling locomotion.

Other notable muscles in this region include the gluteus medius, iliacus, and psoas major which, along with the gluteus maximus, contribute to the movement and stabilization of the hip and thigh. The pelvic girdle is firmly attached to the axial skeleton by strong ligaments and also has robust ligaments creating a deep socket for the femur.

The femur, the longest bone in the human body, also has various other muscles attached along its posterior side, such as the piriformis, obturator internus, and obturator externus. These muscles are essential for the rotation and abduction of the femur at the hip joint. While there are many muscles involved in these processes, the primary muscle that connects the back of the pelvic girdle and the femur is the gluteus maximus.

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Argon has an atomic number of 18 which means that it has 18 electrons. This means that it has a full outer shell. Therefore, it would not have to bond or share with other elements to gain or lose any more electrons since it is already stable.

The action or process of adhering to a surface or object.

the action or process of adhering to a surface or object.

Answer is: addition.

For example, 1,3-butadiene is an unsaturated hydrocarbon.

1,3-butadiene is the simplest conjugated diene and undergoes 1,4 addition reaction in acidic environment.

Chemical reaction: CH₂=CH-CH=CH₂ + H₂O → CH₃-CH=CH-CH₂-OH.

CH₂=CH-CH=CH₂ - 1,3-butadiene.

CH₃-CH=CH-CH₂-OH - 2-buten-1-ol.

Diene or diolefin is a hydrocarbon that has two carbon double bonds.

Answer: This is known as addition reaction.

Explanation:

Unsaturated hydrocarbon is defined as the hydrocarbons which have double or triple covalent bond present between carbon and carbon atoms.

Addition reaction is defined as the reaction in which more atoms are added to the given compound. No atom is lost during this reaction.  

[tex]AB+C\rightarrow ABC[/tex]

This reaction is more favored by unsaturated hydrocarbons because they are more reactive due to the presence of [tex]\pi-[/tex]bonds. They are weaker than [tex]\sigma-[/tex]bonds and thus can be easily broken.

For Example: Hydrogenation of ethene molecule

[tex]H_2C=CH_2+H_2\rightarrow CH_3-CH_3[/tex]

Hence, the reaction is known as addition reaction.

C) 80 protons

Mercury has 80 protons in its nucleus

C. 80 protons have Mercury

I know the answer to your question but if you want me to answer this question first, I need your help with my question "How do I solve number 12? Quick please I need help ASAP!!!"

yes, it is balanced.

Explanation:

When a reaction equation contains equal number of atoms on both reactant and product side then this type of chemical equation is known as balanced chemical equation.

For example, multiply this equation by 2 as follows.

      [tex]2Na^{+} + 2NO^{-1}_{3} \rightarrow 2NaNO_{3}[/tex]

When sodium ions chemically combine with nitrate ions then it results into the formation of sodium nitrate.

Number of atoms on reactant side are as follows.

[tex]Na^{+}[/tex] = 2

[tex]NO^{-1}_{3}[/tex] = 2

Number of atoms on product side.

Na = 2

[tex]NO_{3}[/tex] = 2

Therefore, as it contains same number of atoms on both reactant and product side.

Also, we can never change the subscripts present in a reaction equation but we can change the number of coefficients on each side in order to balance a chemical equation.

Your answer is D.

Chlorophyll traps in the sunlight needed for the process known as 'photosynthesis' .

Nitrogen in this compound has 2 atoms. 2 multiplied by its mass, 14.007, equals 28.014. Divide 28.014 by the molar mass of calcium nitrate: 28.014/164 = 0.17081. Multiply this by 100 to achieve its percentage: 0.17081 x 100 = 17.08%

The study of chemicals and bonds is called chemistry. There are two types of elements and these are metal and nonmetals.

The correct answer is 17.08%.

According to the question, Nitrogen in this compound has 2 atoms.

[tex]2 *4.007 = 28.014.[/tex]

[tex]\frac{28.014}{164} = 0.17081[/tex]

[tex]0.17081 * 100 = 17.08[/tex]%.

Hence, the correct answer is 17.08%.

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Bohr thought that electrons orbited the nucleus in circular paths; whereas in the modern view atomic electron structure is more like 3D standing waves. Bohr built upon Rutherford's model of the atom. ... He believed that electrons moved around the nucleus in circular orbits with quantised potential and kinetic energies.

Modern atomic model is similar to Bohr's atomic model by the fact that an atom has a nucleus around  which electrons revolve in circular orbits.

Atomic model presented by Bohr is a system comprising of small dense nucleus surrounded by electrons  which is similar to the solar system. The only difference being electrostatic forces in place of gravity.

It is successful in explaining the Rydberg's formula for emission of spectral lines of hydrogen. According to this model, electron is able to revolve in stable orbits around the nucleus without any energy being radiated.

Stationary orbits are obtained at distances for which revolving electrons have an angular momentum which is an integer multiple of Planck's constant. Electrons can only gain or loose energy by jumping from one orbit to another.

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ANSWER: B) The heating element on a stove turning from black to orange.

The reason being is that, its a physical reaction, the color changes but the chemical structure of the element stays the same. A's changing and breaking down on a molecular level, that's a chemical reaction. Bleach bonded with the clothing making it from red to pink.

The answer would be A. It wouldn't be B because the gasoline is a chemical which lights when caught with air. Bleach is a chemical that can clean and change the color of things. I don't exactly know how bleach does those things , but I do know the answer would be A.

Answer:

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Final answer:

Convection is the transfer of heat through the movement of fluids, such as the warm air circulation caused by a heater or the water cycling in a boiling pot.

Explanation:

Convection is a fundamental concept in Physics related to the movement of fluids (liquids or gases) as a result of heat transfer. When a fluid is heated, it becomes less dense and rises, whereas cooler fluid descends to take its place, creating a convection current. An everyday example of convection that we experience would be the warm air circulating in a room when a heater is on. As the heater warms the air, this air rises because it is less dense. Cooler air moves in to replace it, gets warmed up, and the cycle continues, resulting in a circulation of air and an overall warming of the room.

Another common example of convection is seen when you boil water in a pot. The water at the bottom gets heated first and rises to the surface, while the cooler water above descends to the bottom of the pot, creating a convection current that helps to evenly heat the water.

A particular atom will have the same number of protons and electrons and most atoms have at least as many neutrons as protons. An element is a substance that is made entirely from one type of atom. ... A compound is a substance made from two or more different elements that have been chemically joined.

Answer is: c. impulse acting on the object.

Momentum is the product of the mass and velocity of an object. It is a vector quantity, possessing a magnitude and a direction in three-dimensional space.

The impulse-momentum change equation: F· t = m · Δ v.

The impulse experienced by the object equals the change in momentum of the object.

To produce 3.33 moles of aluminium chloride, you would need 3.33 moles of aluminium metal.

To find the number of moles of aluminium metal needed to produce 3.33 moles of aluminium chloride, we need to use the stoichiometry of the balanced chemical equation.

From the equation: [tex]2AlCl3 + 3H2O(l) -- Al2O3 + 6HCl(g[/tex],

we can see that 2 moles of AlCl3 are produced from 2 moles of aluminium.

Therefore, in order to produce 3.33 moles of AlCl3, we would need 3.33 moles of aluminium.

3.33 moles of aluminum metal are needed to produce 3.33 moles of aluminum chloride.

To determine how many moles of aluminum metal are needed to produce 3.33 moles of aluminum chloride, we need to look at the balanced chemical equation for the reaction between aluminum and chlorine:

[tex]\[ 2Al + 3Cl_2 \rightarrow 2AlCl_3 \][/tex]

From the balanced equation, we see that 2 moles of aluminum (Al) produce 2 moles of aluminum chloride (AlCl₃). This means there is a 1:1 molar ratio between aluminum and aluminum chloride in the reaction.

Given that we need to produce 3.33 moles of aluminum chloride (AlCl₃), we can use the 1:1 ratio to find the moles of aluminum needed:

[tex]\[ \text{Moles of Al needed} = \text{Moles of AlCl}_3 \][/tex]

Therefore:

[tex]\[ \text{Moles of Al needed} = 3.33 \text{ moles of AlCl}_3 \][/tex]

So, 3.33 moles of aluminum metal are needed to produce 3.33 moles of aluminum chloride.

Answer is: Four hydrogen nuclei join to form a helium nucleus, two neutrinos, and energy.

Hydrogen fusion cycle involves four hydrogen nuclei and two electrons and form of helium nucleus, two neutrinos and six photons.

This process occurs in three steps:

1) Fusion of hydrogen into deuterium.

2) The the formation of helium-3.

3) Recombination of two helium-3 into one nucleus of helium.

This fusion nuclear reaction is in the inner core of the Sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).

Answer:

yes

Explanation:

yes

The answer is "right".

Answer: positive (right)

Explanation:

During resolution of vectors, any force or particle moving towards (north or east) direction are termed positive while vectors moving towards (west and south) are negative

Answer:

The following compounds are arranged in increasing order:

Option D: F2<CO2<NH2CH3

The compounds in order of increasing strength of intermolecular forces are  F₂ < CO₂ < NH₂CH₃ . Therefore, option D is correct.

Intermolecular forces, such as the electromagnetic forces of attraction or repulsion that act between atoms and other kinds of nearby particles, such as atoms or ions, mediate interactions between molecules.

London's dispersion forces (LDF), dipole-dipole interactions, and hydrogen bonds are the three different intermolecular forces. All substances at least have LDF, but molecules can have any combination of these three types of intermolecular interactions.

Because they affect how a substance behaves physically, intermolecular forces are significant. Since water can form hydrogen bonds with other molecules, many of its life-sustaining qualities, such its high heat capacity, are the result of intermolecular forces.

Thus, option D is correct.

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Answer: The correct answer is Chlorine (Cl).

Explanation: Electronegativity is the property of an element to attract the shared pair of electron towards itself. In a periodic table, the electronegativity increases as we move from left to right and it decreases as we move from top to bottom.

The location of the given elements are:

Barium (Ba): It belongs to Group 2 and Period 6 of the periodic table.

Chlorine (Cl): It belongs to Group 17 and Period 3 of the periodic table.

Iodine (I): It belongs to Group 17 and Period 5 of the periodic table.

Strontium (Sr): It belongs to Group 2 and Period 5 of the periodic table.

From the above information, Chlorine belongs to the lowest period and greatest group number. Hence, it has the highest electronegativity and will attract the shared pair of electron towards itself strongly.

Therefore, the correct answer is Chlorine (Cl).

The more right you are and the more up you are, the stronger the connection.

Start by going left to right. The two furthest are Iodine and Chlorine (so barium and strontium are eliminated). Then look at that column vertically. Chlorine is further up, so that is your answer.

the other variable is doubled.

The mass of the salt converted into moles divided by the liters of water in a solution would give the Molarity (M) or concentration of the solution. The simplest way to change the solution would be to change the amount of solute or solvent in a solution.

Answer:

3) Vinegar

Step-by-step explanation:

Vinegar is a dilute solution of acetic acid. It has a sour taste and turns blue litmus red.

1)  NaOH and 3) lye are bases. They both have a slippery feel and turn red litmus blue.

2) Water is neutral. It is neither an acid nor a base.