2. a) An isotope Q has mass number of 34 and 18 neutrons 1. Draw the atomic structure of Q (2mks) a drawing of the atomic structure ​

The bones are 16925 years old.

The process of carbon dating involves counting the amount of the radioactive isotope carbon-14 that is present in a sample. As carbon-14 breaks down into nitrogen-14 over time, less of it is present. Scientists can determine how recently an organism died by calculating the ratio of carbon-14 to carbon-12 in a sample. Now to know the age of the bones we must directly use the radioactive decay law: d N d t ∝ N

Where the rightmost part of the equation comes from the statement that the activity found is just 15.0% of the activity that would be found in a similar live animal. This means that the number of carbon-14 atoms is just  15.0% of what it was at the moment the saber-toothed tiger died.

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The maximum height that is attained by the ball that leaves the hand is 1.8 m.

We know that we can be able to use the equation of the motion of a body that occurs under gravity to be able to obtain the maximum height that has been attained by the ball as it is leaving the hand of the girl.

We would then have that;

v^2 = u^2 - 2gh

v = final velocity

u = initial velocity

g = acceleration due to gravity

h = height of the ball

If v = 0 m/s at the maximum height

u^2 = 2gh

h = u^2/2g

h = (6)^2/2 * 9.8

h = 36/19.6

h = 1.8 m

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50mL of water and 2.5g of sodium hydroxide chips should be dissolved together in a beaker. Because to the increase in temperature Solid sodium hydroxide dissolves in water in an exothermic reaction reaction that releases a significant quantity of heat.

Whenever sodium hydroxide (NaOH) reacts with water, sodium ions (cations) with a positive charge and hydroxide ions with a negative charge separate out (anions).

Although cations and anions typically surround cations more tightly and vice versa, these ions move freely and independently of one another in the water.

         NaOH(s) + H2O(l) => Na+ + OH- + H20 + HEAT

Since, you've solubilized NaOH, the Na+ cations and OH- ions have strong interactions with the oxygen and hydrogen atoms in the water. This is a substance's disintegration.

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The reaction of 2,2-dimethyl-1-propanol, also known as the neopentyl alcohol with HBr gives 2-bromo-2-methylbutane as the major product. It is a SN₁-mechanism.

Neopentyl alcohol is a primary alcohol, but the bulky group has hindered it. The backside attack is not possible, so instead of the SN₂ mechanism SN₁ followed to get the desired rearranged product. The reaction will forms a rearranged stable carbocation from the primary carbocation to the tertiary carbocation.

Protonation of the Neopentyl alcohol will converts the hydroxy group into a good leaving group. Water will leaves form a primary carbocation rearranged through the methyl shift, which is thus forming a stable tertiary carbocation. Bromide ion will also attacks the carbocation to form a product 2-bromo-2-methylbutane. Mechanism will showing the formation of 2-bromo-2-methylbutane.

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Control of metal-support interactions (MSIs) in heterogeneous catalysts can enhance both activity and selectivity.

MSIs refer to the interactions between the metal catalyst and the support material it is placed on. By fine-tuning the MSIs, the activity of the catalyst can be increased by optimizing the distribution and dispersion of the metal particles. In addition, by controlling the MSIs, the selectivity of the catalyst can be improved, allowing for the production of specific products in a reaction. This is done by manipulating the electronic and geometric properties of the metal-support interface, which affect the adsorption and activation of reactant molecules.

In general, controlling MSIs is a powerful way to make heterogeneous catalysts work better.

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Answer:

It sounds like the writer's experiences of scouting have had a profound impact on his life. He values the connection with nature and the skills he learnt, as well as the importance of preserving the environment for future generations. He also mentions the words and phrases associated with scouting, which he says can act as a reminder of the experience and the joy he felt during his time in the Scouts. It's clear that the writer values the experiences of scouting and has a strong appreciation for the outdoors.

Oxygen is a reactant of cellular respiration while being the product for photosynthesis.

It is defined as a process by which plants and other photosynthetic organisms convert the light energy in to chemical energy  through the process of cellular respiration.

Some of the energy which is converted  is stored in molecules of carbohydrates like sugar and starches  which are made up of from carbon dioxide and water . Photosynthetic organisms which can perform photosynthesis  are algae and cyanobacteria. Photosynthesis is largely responsible for producing and maintaining the content of oxygen in earth's atmosphere.

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The percent ionization of the acid is obtained as 21%.

We know that a weak acid is said to be the kind of acid that is not able to ionize completely in solution. The implication of this is that we are still going to have some of the acid that have not be ionized in the system at the end of the reaction.

We know that;

α = √Ka/Co

α = Percent ionization

Ka = acid dissociation constant

Co = Initial concentration

Hence, we have;

α = √0.00839/0.199

= 0.21 or 21%

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The arrows depict the substance's carbon dioxide emission.

A substance is a material that has specific qualities and a specific composition. A substance is any unadulterated element or pure composite. By using any physical technique, a substance cannot be separated. A pure substance has fixed properties/composition. Iron and sugar are two examples of substances.

Matter with a definite composition and set of characteristics is referred to as a substance. A substance is every pure element. It is a material when it is pure. Substance examples: Because iron is an element, it is also a substance. Methane is both a material and a compound.

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Answer:

0.25 grams

Explanation:

mass = (concentration x volume) / 100

The concentration of ketamine is 10.0%w/v and the volume is 2.50 ml.

mass = (10 x 2.50) / 100

mass = 0.25 g

So, there is 0.25 grams of ketamine in 2.50 ml of a 10.0% (w/v) solution.

Electrons from both participating atoms are distributed equally to create a covalent bond.

In this  case option B is correct.

Covalent bonds: how are they created?

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There are 3 moles of HgSO4 in 977 grams of HgSO4.

To calculate this, we need to use the molar mass of HgSO4.

Molar mass of HgSO4 = 271.5 g/mol

hence, 977 g / 271.5 g/mol = 3.6 moles of HgSO4.

What is molar mass?

Molar mass is a physical property of a substance and is measured in grams per mole (g/mol). It is the mass of one mole of a substance and is equal to the sum of the relative atomic masses of all the atoms in a molecule. Molar mass is important in chemistry and is used to calculate the mass of a given number of moles in a substance or solution. It is also used to calculate the mass of a given volume of a substance, such as when calculating the molarity of a solution. Knowing the molar mass of a substance is useful for many calculations, like determining the number of moles in a given mass, or the mass of a given number of moles.

Therefore, There are 3 moles of HgSO4 in 977 grams of HgSO4.

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H2(g) + 2ICI(g) = 2HCI(g) + I2(g) is the overall reaction  Step 2's rate law is rate = k [HI][ICI]

It is critical to consider not only the chemical properties of the reactants, but also the conditions under which the reaction occurs, the mechanism by which it happens, the rate at which it occurs, and the equilibrium toward which it is progressing in a chemical reaction. The substances that influence the reaction rate are usually one or more of the reactant's side, but products can also be included. Catalysts, which are not included in the balanced chemical equation, can also influence the reaction rate.

For a chemical reaction, the rate law (also known as the rate equation) is an expression that describes the relationship between the rate of the response and the concentrations of the reactants involved.

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The complete question is:

Step 1:

H2(g) + ICl(g) ----------- HI(g) + HCI(g) (slow)

Step 2:

HI(g) + ICI(g) ------------ HCI(g) + I2 (g) (fast)

Which of the following represents the overall chemical equation for the reaction and the rate law for elementary step 2?

A) The overall reaction is H2(g) + 2 ICI(g) --------- HCI(g) + I2(g); the rate law for step 2 is rate = k[H2] [HI] [ICI]

B) The overall reaction is H2(g) + 2 ICI(g) -------- 2 HCI(g) + I2(g); the rate law for step 2 is rate = K[H2][ICI]2.

C) The overall reaction is Ha(g) + ICI(g) --------- HCI(g) + 1(g); the rate law for step 2 is rate = K-[H2][ICI].

D) The overall reaction is H2(g) + 2 ICI(g) ------- 2 HCI(g) + I2 (g); the rate law for step 2 is rate = [K][HI] [ICI]

The following are the net ionic processes for removing chromium (III) and cadmium from wastewater using sodium hydroxide: Sodium hydroxide with chromium (III): Cr3+(aq) + 3NaOH(aq) -> Na3Cr(OH)3.

Cadmium in the presence of sodium hydroxide: Cd2+(aq) + 2NaOH(aq) -> Na2Cd(OH)2. Metal ions react with hydroxide ions in both processes to generate insoluble metal hydroxide precipitates that can be readily removed from the solution. Precipitation is a treatment method that is excellent for removing heavy metal ions from wastewater.chromium and cadmium can be removed from wastewater by treatment with sodium hydroxide. show the net ionic reactions of cr3 (aq) with naoh(aq) and cd2 (aq) with naoh(aq).The following are the net ionic processes for removing chromium (III) and cadmium from wastewater using sodium hydroxide: Sodium hydroxide with chromium (III): Cr3+(aq) + 3NaOH(aq) -> Na3Cr(OH)3.

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An molecule is polar if the lengths of the arrows differ and they not balance each other.

Pay close attention to the sound. the smallest part of a molecular that includes both its physical and chemical properties pronounced (MAH-leh-kyool). Molecules are made up of one or more electrons.

Molecules are created when atoms come together. Two hydro (H) ions and one oxygenation (O) atom make up the three atoms that make up a water molecule. Because of this, water is occasionally abbreviated as H2O. There are trillions of water molecules in a single drop of liquid.

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The earth's force would be applied to the object (the earth) in a downward direction, toward the planet's centre. The force that the mineral oil would apply to the object (fmineraloil) would be directed

Mineral oil is a liquid that is produced from petroleum and is transparent, colourless, and odourless. It frequently appears in a wide range of consumer and industrial goods, including lubricants, fuels, cosmetics, and personal care products. Mineral oil functions as a moisturiser and occlusive agent in cosmetics and personal care products, helping to stop water loss from the skin. In several applications for food processing, it is also utilised as a lubricant. Despite its extensive use, certain questions have been raised regarding mineral oil's possible negative effects on health, particularly when it is used in cosmetics and personal care items. According to certain research, regular use of products containing mineral oil may cause skin irritation and blocked pores. But there is conflicting da

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The force that resists the relative motion of two bodies is referred to as irreversibility. Examples of this include chemical reactions, mixing two fluids, and electrical resistance.

Why do we use the term "chemical"?

Any material with a known composition is a chemical. To put it another way, a chemical always consists of the same "substance." There are some substances in nature, like water. Chlorine and other chemicals are made at factories.

What instances from chemistry?

All of these things are made of chemical, some natural and others synthetic, including air, water, iron, fuel, clothes, stone, equipment, plastics, plants, and food. Chemicals can be made up of several different chemicals or they can be specific chemical molecules like water. Ammonia, oxygen, water, carbon dioxide, and other substances are all present in air.

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Take into account that the starting stereochemistry affects the resulting double bond stereochemistry.

Define  stereoisomer ?

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Mols or Temprature was not given so I assumed 70f room and temp.

We know that P = 1 atm, n = number of moles, R = 8.314 J/mol*K and T = (70 + 459.67)*5/9 = 527.67K (converting the temperature from Farrenheight to Kelvin)

so, V = (nRT)/P

Therefore, we need the moles of sulfur hexafluoride gas to calculate the volume. Without the moles of the gas, it is impossible to determine the volume of the gas.

Water is the most abundant atom is a false statement.

Water molecule is composed of two hydrogen atoms and one oxygen atom. Water is necessary for the survival of living organisms. Water is polar because the oxygen atom in water has a higher electronegativity than the hydrogen atoms, resulting in a partial negative charge on the oxygen atom and partial positive charges on the hydrogen atoms.

Water stabilizes temperature because it has a high heat capacity, meaning it can absorb or release a large amount of heat without experiencing a significant change in temperature. This allows it to act as a temperature buffer, helping to maintain a relatively stable temperature in living organisms and in the environment.

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As in the context of drug misuse, the following chemical types are linked to their corresponding definitions of misuse:

Drug misuse refers to the incorrect or harmful use of a substance, including prescription and over-the-counter drugs, as well as illegal drugs. This can include taking a higher dose than prescribed, using someone else's medication, using a drug for non-medical purposes, or combining drugs in a way that is dangerous. Drug misuse can lead to negative health consequences and may also contribute to the development of a substance use disorder.

Prescription drugs (not in the context of misuse) are medications that are prescribed by a healthcare professional and are intended for use in the treatment of a specific medical condition.

Nonprescription drugs, also known as over-the-counter (OTC) drugs, (not in the context of misuse) are substances that are available for purchase without a prescription. They are used to treat common health issues, such as pain or a headache, but can also be abused. Chemicals refer to any substance, whether natural or man-made, that can be used for a specific purpose, including but not limited to drugs.

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The lowest energy orbital will be closest to the nucleus of an atom. Each and every orbital is filled with electrons in the order: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p, and so on.

The lowest energy sublevel always be the 1s sublevel, which consists of one orbital. The single electron of an hydrogen atom will be occupy the 1s orbital when the atoms are in its ground state. As we proceed with atoms with multiple electrons, those electrons are added to the next lowest sublevel: 2s, 2p, 3s, and so on. Orbitals will be ranked in the increasing order of orbital energy as follows: 1s < 2s = 2p < 3s = 3p = 3d <4s = 4p = 4d= 4f.

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Answer: B

Explanation:

Sharla finds a container labeled tungsten and Sharla found 2.05 moles of tungsten in the container.

Mole is the amount of substance of a system that contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12 and its symbol is “mol”. One mole of substance is equal to the value of 6.023 x 10^23 (Avogadro's number). It can be used to measure the products obtained from chemical reaction.

As, number of moles is mass / molar mass

so, molar mass of tungsten is 183.84 g/mol.

the number of moles of tungsten that Sharla found would be:

number of moles = 377.64 g / 183.84 g/mol = 2.05 mol

Therefore, Sharla found 2.05 moles of tungsten in the container.

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A color's degree of purity is measured by intensity, commonly referred to as saturation or chroma. While a low-intensity color is more muted or neutral, a very intense hue is dazzling.

The complete question is,

What is a hue that is quite intense?

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The statement that correctly expresses the relationship between frequency and wavelength is as follows: Frequency increases as wavelength decreases i.e. gets shorter (option A).

Wavelength is the length of a single cycle of a wave, as measured by the distance between one peak or trough of a wave and the next.

The wavelength is often designated in physics as λ, and corresponds to the velocity of the wave divided by its frequency.

Frequency and wavelength are inversely proportional to each other. The wave with the greatest frequency has the shortest wavelength and vice versa.

Therefore, option A is correct.

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If a government wants to efficiently reduce a widespread negative externality like air pollution, it must know the costs of pollution abatement of the individual polluters.

a. lower, higher

b. lower, lower

The term "abatement costs" refers to the expenses incurred by a company or organization when it becomes necessary to get rid of any unwelcome annoyances or unfavorable byproducts of the production process. It is the cost associated with removing a harmful externality, such as pollution that has an adverse environmental impact.

As tradable emissions permits are available, organizations with lower abatement costs can sell them to companies with higher abatement costs in order to address the issue of pollution abatement costs.

The firm that sold the permit would have lower abatement costs and the negative externality is also lowered at the lowest cost achievable if the firm still had to cut its pollution output after selling.

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If a government wants to efficiently reduce a widespread negative externality like air pollution, it must know the costs of pollution abatement of the individual polluters. However, this information is difficult to obtain directly. Tradeable emissions permits are one way to solve the asymmetric information problem affecting pollution abatement efforts.

a. Because the permits are tradeable, firms with ___ abatement costs will sell some of their permits to firms with ___ abatement costs.

Now consider that even after a firm has sold its permits, it must still reduce its pollution output.

b. Since those who sell their permits would have ___ abatement costs, the negative externality is reduced at ___ possible cost to society.

The carbon that is SP2 hybridized in the compound is carbon 4 (C4).

When we talk about the hybridization of the carbon atom, we mean the fact that the orbitals that are in the carbon atom are mixed in such a way that the orbitals that have the appropriate energy to be able to participate in the chemical bonds are formed.

As such looking at the compound that we have been shown in the image, we can see that not all the carbon atoms would be at the same state of hybridization.

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Xe and Pb are atomic elements. I₂ and Br₂ are molecular elements. CaCl₂ and Al₂S₃ are ionic compounds and NO₂ and H₂S are molecular compounds.

Atomic elements are the elements which cannot be broken down further and combine together to form molecules. Among the substances given to us, Xenon (Xe) and Lead (Pb) can be categorised as atomic elements. Molecular elements are formed when the same elements combine with each other. I₂ and Br₂ are molecular elements.

Ionic compounds are consist of ions bound together. CaCl₂ and Al₂S₃ are ionic compounds. Molecular compounds are formed up of two or more elements and NO₂ and H₂S are molecular compounds.

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