Which of the following elements will form positive ions? Check all
that apply.
Na
z
Cu
Br

that the number of collisions depends on the energy, of the number of reactant particles, not their orientation.

Energy is referred to by scientists as the capacity for work.People have figured out how to transform energy from one type to the other and use it to accomplish tasks, making modern civilization possible.

boosts employee confidence and enables new hires to settle in more quickly; results in a more efficient and successful staff; increases employee retention; andencourages dialogue between the new employee and the supervisor.

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Answer:

Hydrogen

Explanation:

When a cracker dissolves in your mouth, then this is a chemical change. A chemical reactions is an atomic rearrangement-based chemical process.

An alteration of one or more compounds as one or maybe more new and distinct substances is referred to as a chemical change or chemical reaction. In other terms, a chemical reactions is an atomic rearrangement-based chemical process.

A chemical change normally cannot be reversed unless through additional chemical processes, although a physical change may frequently be done so. The power of the system changes when a chemical shift takes place. When a cracker dissolves in your mouth, then this is a chemical change.

Therefore, when a cracker dissolves in your mouth, then this is a chemical change.

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The assumption that accounts for the great compressibility of gases compared to liquids and solids is assumption 1: Gases are made up of molecules which are relatively far apart. Option A)

The assumption that accounts for the great compressibility of gases compared to liquids and solids is assumption 1: Gases are made up of molecules which are relatively far apart.

In gases, the molecules are widely spaced and have significant gaps between them. This allows gases to be easily compressed under pressure. When external pressure is applied to a gas, the molecules can be brought closer together, reducing the volume occupied by the gas. The gaps between the molecules provide room for compression, allowing gases to occupy a smaller volume.

In contrast, liquids and solids have molecules or particles that are closely packed together. The intermolecular forces in liquids and solids are stronger, limiting their compressibility. The molecules or particles are already in close proximity, leaving little room for further compression.

Therefore, the assumption that gases consist of molecules that are relatively far apart accounts for their greater compressibility compared to liquids and solids. Hence Option A) is correct.

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Answer: The balanced equation is  4 NH3 + 7 O2  -->  4 NO2 + 6 H2O

Explanation:

Oxidation numbers

We begin by noting the oxidation numbers on each atom:

NH3:   N = -3, H = +1

O2:     O = 0

-----------------

NO2:  N = +4, O = -2

H2O:  H = +1,  O = -2

From this we conclude that N has lost 7 electrons, while O has gained 2.

Half-reactions

Because this case is more complex, we must consider the half-reactions:

Eq. 1)  N^-3  -->  N^+4  + 7 e-        (which says that N has lost 7 electrons)

Eq. 2) O  + 2 e- --> O^-2                (which says that O has gained 2 electrons)

However, oxygen is a diatomic atom, so we must adjust the second equation by a factor of 2.

Eq. 1)  N^-3  -->  N^+4  + 7 e-

Eq. 2) O2  + 4 e- --> 2 O^-2

Balancing the Half-reactions

To balance the half-reactions, we must multiply each equation by a factor that allows us to cancel out the electrons. The LCM of 7 and 4 is 28, so we multiply the first equation by 4, and the second equation by 7, giving:

Eq. 1)  4 N^-3  -->  4 N^+4  + 28 e-

Eq. 2) 7 O2  + 28 e- --> 14 O^-2      

Now, adding them together gives:

4 N^-3  +  7 O2  --> 4N^+4  + 14 O^-2

All together...

To complete the reaction, we must add the missing hydrogen atoms. With 4 nitrogen atoms on the left, we require 12 hydrogen atoms to construct the 4 NH3 molecules. We will add 12 H to both sides:

4 N^-3  +  7 O2  --> 4N^+4  + 14 O^-2

 + 12 H                      + 12 H

-------------------------------------------------------

4 N^-3 + 12 H + 7 O2  --> 4N^+4  + 14 O^-2 + 12 H

We can now combine all the atoms together into the known molecules on each side:

4 NH3 + 7 O2 --> 4N^+4 + 8 O^-2 + 12 H + 6 O^-2

which is,

4 NH3 + 7 O2 --> 4 NO2 + 6 H2O

The chemical formula O₂ which is oxygen is a molecule as it is made up  of 2 oxygen atoms.

Chemical  formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols  of elements. It also makes use of brackets and subscripts.

Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form  is called empirical formula.

It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.

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100Eu+e 16S---Sm150  represents alpha decay because  minimum penetration power and highest ionization power.

A positively charged particle similar to the helium-4 nucleus is spontaneously released during alpha decay. Two protons and two neutrons make up this particle, also referred to as an alpha particle. Sir Ernest Rutherford made the discovery and gave it a name in 1899.

The nuclei of heavy elements like radium, uranium, thorium, etc. undergo alpha decay. When a radium (Ra) nucleus decays, it releases an alpha particle and transforms into a radon (Rn) nucleus.

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3.68*10-5 m/s  is the average rate of the reaction during this time period.

What is rate of reaction?

A rate of reaction is the speed at which a chemical reaction takes place. It is usually expressed as the change in the concentration of a reactant or product per unit time. The rate of a reaction is determined by many factors, including the physical state of the reactants, the temperature, the concentration of the reactants, the presence of a catalyst, and the surface area of the reactants that are in contact with each other.

2NO(g)+O2(g) -> 2NO_2(g)

Rate = -1/2 d[No]/dt

Average Rate = -1/2[0.0225-0.0700/650-5]

           = 3.68*10^-5 m/s

Therefore, 3.68*10-5 m/s  is the average rate of the reaction during this time period.

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Using the periodic table, THE molecule that has a stable configuration that satisfies the octet rule for all atoms is option B: MgO

MgO (Magnesium Oxide) and (Magnesium Oxide) establish an ionic bond thanks to the electrostatic attraction that develops between them. A MgO molecule contains two atoms with stable octet arrangements.

Note that when we study the octet rule of the MGO Lewis structure. The octet rule is satisfied by the oxygen atoms and magnesium in the MgO Lewis structure. Since oxygen only requires two electrons, the condition transfers two electrons. Oxygen receives these two electrons from magnesium, a metal having two electrons in its valence shell.

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The result of the given mathematical operation is - 5.1. Here the significant figures must be rounded to 2 because we have to consider the decimal point of those digit with least decimal points.

Significant figures are valid digits with certainty plus some know uncertainty associated with it. To count the significant figures in a number there are certain rules and these rules must be followed with mathematical operations too.

When two decimal numbers are adding, the result must contains equal number of decimal points as in the number with the least decimal points. This rule must be followed not only for addition but also for all other operations too.

Here the number with least decimal point is 12.4, with one decimal point only, hence the answer must be end in two decimal point. Here we are substracting a large number from a small number thus, negative sign is added to the answer.

i.e. 7.273 - 12.4 = - 5.1.

Therefore, the answer for the given mathematical operation is -5.1.

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Answer:

D

Explanation:

Xeriscaping is a landscaping approach that focuses on conserving water by using drought-tolerant plants and efficient irrigation techniques. The goal is to create a visually appealing and sustainable garden while minimizing water usage.

Successful xeriscaping projects involve several key elements. Firstly, careful plant selection is crucial, opting for species that can thrive in arid conditions without excessive watering. Mulching is used to reduce evaporation and retain soil moisture.

Proper soil preparation, such as improving drainage and adding organic matter, promotes healthier plant growth. Efficient irrigation systems, like drip irrigation or soaker hoses, deliver water directly to plant roots, minimizing wastage.

Additionally, controlling erosion through the use of retaining walls or terracing is important. Lastly, regular maintenance, including appropriate pruning and weed control, ensures the longevity and vitality of the xeriscape garden. Overall, a successful xeriscaping project harmonizes sustainable practices with a beautiful outdoor environment.

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The best description of how electrons are transferred in an ionic bond is that metal atoms lose electrons and nonmetal atoms gain electrons. Option A.

Ionic bonds are formed when an atom donates electrons to another atom. In other words, ionic bonds are formed between two atoms in which one donates electrons and the other accepts electrons.

The electron donors in an ionic bond are usually metal atoms while the electron acceptors are usually non-metal atoms. The metal atoms donate their valence electrons to form an octet structure while the nonmetal atoms accept electrons to fill their valence electrons and become octet structures.

In summary, ionic bonds are formed when metallic atoms donate electrons and nonmetallic atoms accept electrons.

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Answer:

1024 sodium atoms.

The equation C2H4(g) + H2(g) + C2H6(g) → Caco3(s) + Cao(s) + CO2(g) shows an increase in entropy due to the formation of a gas as a product. Option A

In this equation, the reactants on the left-hand side consist of gases (C2H4 and H2), while the products on the right-hand side include a solid (Caco3) and a gas (CO2).

When a reaction involves a change from gaseous to solid or liquid states, there is typically a decrease in entropy because the particles become more ordered and constrained in the solid or liquid phase.

Conversely, when a reaction involves the formation of gases, there is generally an increase in entropy because gases have higher degrees of molecular motion and greater freedom of movement compared to solids or liquids.

In the given equation, the reactants include three gaseous compounds (C2H4, H2, and C2H6), and one of the products is a gas (CO2). Therefore, the overall entropy of the system increases during this reaction.

The equation Fe(s) + S(s) → FeS(s) does not show an increase in entropy. Both the reactants (Fe and S) and the product (FeS) are solids. Since solids have lower entropy compared to gases or liquids, the entropy of the system does not increase in this reaction. Option A

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Answer:

Water molecules in the form of steam are moving very fast with large spaces between the molecules. Water and hydrogen peroxide are made of the same elements: oxygen and hydrogen. However, hydrogen peroxide (H2O2) has 1 more oxygen than water (H2O).

Explanation:

Answer:

a. Hydrogen

Explanation:

They both contain two hydrogen atoms

\(H_{2} O_{2} \\H_{2}O\)

Hydrogen peroxide: two hydrogen atoms (H2) and two oxygen atoms (O2)

Water: two hydrogen atoms (H2) and one oxygen atom (O)

The balanced chemical equation is CaS + AlC → A + CaC

To balance the chemical equation CaS + AlC → A + CaC, we need to ensure that the same number of atoms of each element is present on both sides of the equation. Here's the step-by-step process to balance the equation:

Begin by counting the number of atoms of each element on both sides of the equation.

Left side (reactants):

Calcium (Ca): 1

Sulfur (S): 1

Aluminum (Al): 1

Carbon (C): 1

Right side (products):

A: 1

Calcium (Ca): 1

Carbon (C): 1

Sulfur (S): 0

Start by balancing the elements that appear in the fewest compounds. In this case, we can balance sulfur (S) first. Since there is only one sulfur atom on the left side and none on the right side, we need to add a coefficient of 1 in front of A on the right side to balance the sulfur.

CaS + AlC → 1A + CaC

Next, balance calcium (Ca) by adding a coefficient of 1 in front of CaS on the left side.

1CaS + AlC → 1A + CaC

Now, balance aluminum (Al) by adding a coefficient of 1 in front of AlC on the left side.

1CaS + 1AlC → 1A + CaC

Finally, balance carbon (C) by adding a coefficient of 1 in front of CaC on the right side.

1CaS + 1AlC → 1A + 1CaC

The balanced chemical equation is:

CaS + AlC → A + CaC

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Human impact on the environment is often more dramatic than the impact

of most other living things because humans have a greater ability to alter

the environment​.

Human beings are usually in control of most of the resources on earth such

as plants, animals, etc. Humans have developed new technologies for doing

things which have an impact on the environment.

Deforestation, burning of fossil fuel in automobiles and industries emits toxic

gases which have been found to alter the environment more than other

living things.

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Answer:

C. 65 percent

Na₂SO₄ contains 1.90834 X 10²⁴ molecules or formula units in a 450 gram sample.

Formula unit- The chemical formula of an ionic compound that lists the ions in the smallest ratio that corresponds to a neutral electrical charge is known as a formula unit. Chemical formulae are used to describe the constituent parts of a compound in chemistry.

Na₂SO₄ molecular mass is 23x2+ 32+ 16X4.

= 142g/mol

Na₂SO₄ mass = 450g

Na₂SO₄ moles are equal to mass/molar mass.

450g/142g/mol = 3.170 mol.

6.02 X 10²³ mol is the Avogadro's number.

formula unit= moles * Avogadro's number

⇒3.17 X 6.02 X 10²³ molecules= 1.90834 X 10²⁴  

Na₂SO₄ therefore contains 1.90834 X 10²⁴ molecules or formula units..

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0.13M NaClO

Explanation:

9.5 g NaClO × (1 mol NaClO/74.442 g NaClO)

= 0.13 mol NaClO

Molarity = 0.13 mol NaClO/1 L

= 0.13M NaClO

Answer:

5.12 L

Explanation:

P1V1/T1 = P2V2/T2

1.71 atm *10.0L /100 K = 9.70 atm *x/290.29 K

x = 1.71 atm *10.0L*290.29K /(100 K * 9.70 atm)= 5.12 L

In an enzyme-catalyzed reaction, the rate-limiting step is typically the binding of substrate to the active site of the enzyme. K2 and k-2 represent the rate constants for the formation and breakdown of the enzyme-substrate complex, respectively. These rate constants are important in determining the overall rate of the reaction, but they do not determine the initial velocity, which is largely determined by k1.

Enzyme Catalyzed is the increase in the rate of a process by a biomolecule. Such biomolecules are called enzymes, and most enzymes are proteins, while the processes they accelerate are mostly chemical reactions in the body.

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Answer:

Below

Explanation:

2 K2  CuNa2 ===>  2 K2 Na  + Cu      <====K, Na and Cu are the same # on each side (though I have never seen ' K2' except in mountaineering) and drug lore)

Answer:

a)

1-Pentanamine

2-Pentanamine

3-Pentanamine

3-methyl-2-butanamine

3-methyl-1-butanamine

2-methyl-1-butanamine

2-methyl-2-butanamine

2,2-dimethyl-1-propanamine

b)

2-pentanamine

3-methyl-2-butanamine

2-methyl-1-butanamine

Explanation:

Amines are organic compounds derived from ammonia by replacing the hydrogen atoms, one at a time with carbon-containing groups. The functional groups are R-NH₂, R₂-NH, and R₃-N

Amines are classified into primary, secondary, or tertiary according to the number of substituted hydrogen.

From the given question.

A compound with the molecular formula C₅H₁₃N was given;

The possible eight structural formula of the compound and those that exhibit chirality can be seen in the attached image below.

Ammonia (\(NH_3\)) and ammonium chloride (\(NH_4Cl\)) mixture could be a useful buffer in a solution. Option C

A buffer is a solution that can resist changes in pH when small amounts of acid or base are added. It consists of a weak acid and its conjugate base or a weak base and its conjugate acid. The buffer system works by the principle of Le Chatelier's principle, where the equilibrium is shifted to counteract the changes caused by the addition of an acid or a base.

In option A, acetic acid (\(CH_3CO_2H\)) is a weak acid, but hydrochloric acid (HCl) is a strong acid. This combination does not form a buffer because HCl is completely dissociated in water and cannot provide a significant concentration of its conjugate base.

Option B consists of sodium hydroxide (NaOH), which is a strong base, and elemental sodium (Na), which is a metal. This combination does not form a buffer as there is no weak acid-base pair involved.

Option D contains acetic acid (\(CH_3CO_2H\)), a weak acid, and ammonia (\(NH_3\)), a weak base. Although they are weak acid and base, they do not form a buffer system together as they are both weak acids or bases and lack the required conjugate acid-base pair.

Option C, ammonia (\(NH_3\)), is a weak base, and ammonium chloride (\(NH_4Cl\)) is its conjugate acid. This combination can form a buffer system. When ammonia reacts with water, it forms ammonium ions (NH4+) and hydroxide ions (OH-).

The ammonium ions act as the weak acid, while the ammonia acts as the weak base. The addition of a small amount of acid will be counteracted by the ammonium ions, and the addition of a small amount of base will be counteracted by the ammonia, thus maintaining the pH of the solution relatively stable.

Therefore, option C, consisting of ammonia (\(NH_3\)) and ammonium chloride (\(NH_4Cl\)), is the suitable mixture that could be a useful buffer in a solution.

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Answer:

stress

Explanation:

people cn get stressed and not want to do work

Answer:

the concept of mixing atomic orbitals to form new hybrid orbitals

Answer:

The somatosensory cortex is a region of the brain which is responsible for receiving and processing sensory information from across the body, such as touch, temperature, and pain.

Area 1 specifically is important in sensing the texture of an object. :)

Hope this helps!