an elemental analysis of the acid indicates that it is composed of 6.67 % h , 40.0 % c , and 53.3 % o by mass. what is its molecular formula?

A chemical reaction that prefers one potential structural isomer over one or more other structural isomers is accurately referred to as stereoselective.

One stereoisomer from a variety of stereoisomers interacts in a stereoselective reaction. Additionally, a reaction that, although it has the potential to yield two or more stereoisomers, only ever yields one stereoisomer.

The overall reaction is referred to as stereoselective if more than one reaction between a group of reactants may take place under the same circumstances, producing products that are stereoisomers, and if one product forms in larger proportions than the others.

Occasionally, the phrase "stereospecific" is used to denote "100% stereoselective" (cf. regiospecific). It is advised to avoid using the phrase stereospecific to signify 100% stereoselective because the term's original definition is different.

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Answer: Ea=5.29 × 10⁴ J/mol

Explanation:In going from 25 °C (298 K) to 35 °C (308 K), the rate of the reaction doubles. Since the rate of the reaction depends on the rate constant (k), this implies that the rate constant doubles. We can find the activation energy (Ea) using the two-point form of the Arrhenius equation.

Explanation:

A substance that is only made up of carbon and hydrogen has a mass composition of 85.7% c and 14.3% h. The compound's empirical formula is CH₂.

An empirical formula is a chemical formula for a compound that only specifies the proportions of the components present rather than the exact number of atoms.

The empirical formula for molecules is the most straightforward iteration of the molecular formula. To find this, divide each subscript in the formula by its lowest common denominator.

Atomic mass number % is the easiest formula to use to calculate an element's percentage in relation to the number of atoms.

With a density of 85.7 and an atomic mass of 12, carbon has a mass number of 7.141.

Hydrogen has a mass of 14.3 and

an atomic mass of 1 = 14.3 / 1 = 14.3²

As a result, the compound's empirical formula is C₁H₂= CH₂.

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Answer:

B) A person activates a cold pack by hitting it against a surface.

C) A rechargeable battery is plugged in to charge.

D) Heat is used to separate a compound into its elements.

Explanation:

Chemical reactions that absorb energy are called endothermic reactions. Endothermic reactions absorb energy in the form of heat, light, or electricity, which causes the temperature of the system to decrease.

A) Plants use sunlight and atmospheric gases to make food through photosynthesis, which is an endothermic reaction that absorbs energy in the form of light.

B) A person activates a cold pack by hitting it against a surface, which triggers an endothermic reaction that absorbs heat from the surroundings, causing the cold pack to become cold.

C) A rechargeable battery is plugged in to charge, which involves an endothermic reaction that absorbs electrical energy, converting it into chemical energy that is stored in the battery.

D) Heat is used to separate a compound into its elements through heating, which is an endothermic reaction that absorbs heat from the surroundings, causing the temperature of the system to decrease.


ALLEN

The molarity of a saturated solution of the free-base form of cocaine in ethanol is 0.49M if it has a solubility of 1.00 g in 6.70 ml ethanol.

Given the mass of free-base form of cocaine = 1g

The volume of ethanol = 6.70mL

Molarity is calculated as moles of solute divided by the volume of solution

We know that Volume of solute + Volume of solvent gives Volume of solution.

Moles of solute cocaine ([tex]C17H21NO4[/tex]) = mass of cocaine/molar mass

moles = 1/303.353 = 0.00330 mol [tex]C17H21NO4[/tex]

Volume of solution = 6.7/1000 = 0.0067 L

Then the molarity = 0.00330/0.0067 = 0.49 mol/L or 0.49 M

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Answer:

Ionic compounds need to reach stability in their charges because they are composed of ions, which are atoms or molecules that have gained or lost electrons. The positive and negative charges within an ionic compound must balance out in order to achieve stability. If the charges are not balanced, the compound will be unstable and will tend to react with other ions or molecules in an attempt to reach a state of stability. This is why ionic compounds form crystal lattices, with each ion arranged in a specific position in the lattice so that the positive and negative charges are evenly balanced.

Explanation:

Tell me if you still confuse

ALLEN

Answer:

Explanation:

The balanced equation for the reaction between nitric acid (HNO3) and Zinc Hydroxide (Zn(OH)2) is:

2 HNO3 + Zn(OH)2 -------------> Zn(NO3)2 + 2 H2O

This reaction produces Zinc Nitrate (Zn(NO3)2) and water (H2O) as products. The coefficients in front of each element ensure that there are the same number of atoms of each element on both sides of the equation.

The pH values after the given volumes of acid have been added are: a) 12.18, b) 12.39, c) 11.78, d) 11.25, and e) 10.79.

To solve the problem, we need to use the balanced chemical equation for the reaction between KOH and HClO4:

KOH + HClO4 -> KClO4 + H2O

At the start of the titration, before any HClO4 has been added, we have a solution of KOH with a concentration of 0.150 M. We can use this concentration to calculate the initial concentration of hydroxide ions in the solution:

[OH-] = 0.150 M

a) Before any HClO4 has been added, the volume of the solution is 20.0 mL. At this point, no HClO4 has reacted with the KOH, so the concentration of OH- ions is still 0.150 M. To calculate the pH, we can use the formula for the dissociation constant of water:

Kw = [H+][OH-] = 1.0 x 10^-14

pH = -log[H+]

[H+] = Kw/[OH-] = 6.67 x 10^-13 M

pH = -log(6.67 x 10^-13) = 12.18

b) After 1.5 mL of HClO4 has been added, the volume of the solution is 21.5 mL. The moles of HClO4 added is:

0.125 mol/L x 0.0015 L = 1.875 x 10^-5 mol

The moles of KOH initially in the solution is:

0.150 mol/L x 0.020 L = 0.003 mol

Thus, the moles of KOH remaining after reaction with HClO4 is:

0.003 mol - 1.875 x 10^-5 mol = 0.00298125 mol

The total volume of the solution is 21.5 mL, so the new concentration of KOH is:

0.00298125 mol / 0.0215 L = 0.1387 M

Using this concentration, we can calculate the concentration of OH- ions:[OH-] = 0.1387 M

Using the same formula for Kw and pH as before, we find that:

[H+] = 4.06 x 10^-13 M

pH = -log(4.06 x 10^-13) = 12.39

c) Repeating the above process for a volume of 24.0 mL gives:

[H+] = 1.64 x 10^-12 M

pH = -log(1.64 x 10^-12) = 11.78

d) For a volume of 26.5 mL:

[H+] = 5.67 x 10^-12 M

pH = -log(5.67 x 10^-12) = 11.25

e) For a volume of 29.0 mL:

[H+] = 1.63 x 10^-11 M

pH = -log(1.63 x 10^-11) = 10.79

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Answer:

Weak electrolyte

Explanation:

Weak Bases: NH3, C5H5N etc

The term that describes the electrolyte capacity of pyridine (C₅H₅N), which partially dissociates in water, is a weak electrolyte.

A weak electrolyte is a substance that partially dissociates into ions when dissolved in a solvent, typically water. Unlike strong electrolytes that completely ionize, weak electrolytes only undergo a partial ionization, resulting in a lower concentration of ions in the solution.

In the case of pyridine, it undergoes a partial dissociation in water, producing a small concentration of ions. This means that it conducts electricity to a lesser extent compared to a strong electrolyte, which undergoes complete dissociation and produces a higher concentration of ions.

Therefore, pyridine can be classified as a weak electrolyte.

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Only, one mole of diphenylmethanol can be produced from one mole of benzophenone.

The reaction of benzophenone with a reducing agent (such as sodium borohydride) can produce diphenylmethanol according to the following balanced chemical equation:

C₁₃H₁₀O + 2NaBH₄ + 2H₂O → C₁₃H₁₄O + 2NaBO₂ + 4H₂

From the balanced equation, we can see that one mole of benzophenone (C₁₃H₁₀O) reacts with two moles of NaBH₄ and two moles of water to produce one mole of diphenylmethanol (C₁₃H₁₄O) and two moles of NaBO₂ and four moles of hydrogen gas (H₂).

If an excess of reducing agent is added, it means that there is more than enough NaBH₄ to react with all of the benzophenone present. In this case, the limiting reagent is benzophenone, and the amount of diphenylmethanol that can be produced is determined by the amount of benzophenone available.

Therefore, from one mole of benzophenone, we can produce one mole of diphenylmethanol when an excess of reducing agent is added.

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In a trial, a 0.300 m solution of N[tex]_2[/tex]  had a new molarity of 0.156 after 500 seconds. Therefore, 0.0003mol /l× s is the rate of formation of N[tex]_2[/tex].

The reaction rate or rate of reaction is the rate at which a chemical reaction occurs, defined as proportional to the rise in product concentration per unit time and the reduction in reactant concentration per unit time.

The speeds of reaction might vary greatly.

rate of formation of N[tex]_2[/tex] = change in concentration/ change in time

                                   =0 .300 - 0.156 /0- 500

                                     =0.15/500

                                      =0.0003mol /l× s

Therefore, 0.0003mol /l× s is the rate of formation of N[tex]_2[/tex].

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Answer:

2

Explanation:

Answer:

2

Explanation:

Sucrose is the carbohydrates that disaccharide made from a glucose which is linked to a glucose named fructose.

Carbohydrates are one of the macro minerals, along with protein and fat, that give the energy necessary for the body to perform all it's diurnal functions. There are two general types of carbohydrates called simple carbohydrates and complex carbohydrates.

Simple carbohydrates are broken down by the body veritably snappily into glucose for energy, and complex carbohydrates have longer chains of glucose motes and thus take longer to digest.

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The density of the block in g/cm3 would be 7.11 g/cm3. and the metal's identity would be zinc.

Density = mass/volume

Mass of the metal = 1.80 x [tex]10^4[/tex] mg = 1.80 x [tex]10^4[/tex] mg/1000 = 18 g

Dimension of the metal = 0.5839 inches by 0.531 inches by 0.4981 inches

0.5839 inches = 0.5839 x 2.54 = 1.4831 cm

0.531 inches = 0.531 x 2.54 = 1.3487 cm

0.4981 inches = 0.4981 x 2.54 = 1.2652 cm

Volume of the metal =  1.4831x1.3487x1.2652 = 2.5307 cm3

Density of the metal = 18/2.5307 = 7.11 g/cm3

In other words, the density of the metal is 7.11 g/cm3. The metal is likely to be Zinc.

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Answer:

7.30g Potassium Chloride (KCl)

Explanation:

You are given 12.0 grams of KClO3, so start with that!

12g KClO3[tex]\frac{12g KClO3}{ } \frac{1 mol KClO3}{122.55g} \frac{2 mol KCl}{2 mol KClO3} \frac{74.55g KCl}{1 mol KCl} = 7.299877601[/tex]≈7.30

The enthalpy of vaporization is greater than the enthalpy of fusion, because separating molecules completely from the liquid to form a gas requires more energy than separating molecules from their bound crystalline state to a liquid state.

Because it takes more energy to entirely separate molecules from a liquid to produce a gas than to move them from their bonded, crystalline state to a liquid state, the enthalpy of vaporisation is greater than the enthalpy of fusion.

What is Enthalpy?

Enthalpy is a measure of the total energy of a thermodynamic system, including both its internal energy and the product of its pressure and volume. It is represented by the symbol H and is often used in the context of chemical reactions or changes in state of matter. Enthalpy changes can be used to measure the heat absorbed or released in a reaction or process.

Segment D is longer than segment 87 because it takes more energy to vaporize a substance than to melt it. In segment D, the substance is changing from a liquid to a gas, which requires more energy (enthalpy of vaporization) than in segment 87, where the substance is changing from a solid to a liquid (enthalpy of fusion).

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After balancing the chemical equation, we have 4 sulfate groups on each side, so the equation is balanced. Therefore, the coefficient for sulfuric acid is 4.

The balanced chemical equation for the reaction between radium phosphate and sulfuric acid is:

Ra3(PO4)2 + 3 H2SO4 → 3 RaSO4 + 2 H3PO4

To balance the equation, we need to ensure that the number of atoms of each element is the same on both sides. We can start by balancing the phosphorus (P) and sulfur (S) atoms, which appear only in one compound on each side. We can see that there are 2 P atoms and 8 O atoms on the left side, and 2 P atoms and 12 O atoms on the right side, so we need to add 4 H3PO4 on the left side to balance the P and O atoms. This gives us:

Ra3(PO4)2 + 3 H2SO4 → 3 RaSO4 + 4 H3PO4

Now we have to balance the hydrogen (H) and the sulfate (SO4) atoms. On the left side, we have 12 H atoms (from the 4 H3PO4) and 6 SO4 groups (from the 3 H2SO4), while on the right side we have 8 H atoms (from the 4 H3PO4) and 3 SO4 groups (from the 3 RaSO4). To balance the hydrogen atoms, we need to add 4 H2SO4 on the left side, which gives us:

Ra3(PO4)2 + 4 H2SO4 → 3 RaSO4 + 4 H3PO4

Now we have 4 sulfate groups on each side, so the equation is balanced. Therefore, the coefficient for sulfuric acid is 4.

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The temp range of Hanna pH temp probe lies between -5.0 to 105.0°C.

According to the new definition of temperature, according to the General Conference on Weights and Measures, is: "The kelvin, symbol K, is the SI unit of thermodynamic temperature and its magnitude is set by fixing the numerical value of the Boltzmann constant to be equal to exactly 1.380649 × 10-23... J K-1 [joules per kelvin].

Hence, the temperature range of Hanna pH temp probe lies between 5.0 to 105.0°C. Simultaneous pH and temperature measurements is done in a large dual-line LCD display. Automatic pH calibration at one or two points within two memorized buffer sets (standard or NIST) is selectable temperature unit (°C).

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The decomposition of N2O5 is a first-order reaction. First-order reaction is an accurate description of the N2O5 decomposition process.

The rate of a first-order reaction is one in which the concentration of a single reactant raised to the power of one determines the rate of the reaction. It is discovered that the rate of N2O5 breakdown is exactly related to the concentration of N2O5. A second-order reaction is one in which the rate of the reaction is proportional to the concentration of the reactant raised to the power of two, as opposed to a zero-order reaction in which the rate of the reaction is independent of the reactant concentration.

The orders of each reactant in the rate equation are added to get the overall reaction order, which in this case would be one (first-order).

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The ground state electronic configuration for calcium is 1s²2s²2p⁶3s²3p⁶4s².

The electron configuration of an element usually describes how electrons are distributed among its atomic orbitals. Electron configurations of atoms follow a standard notation in which all electron-containing atomic subshells (with the number of electrons they hold is written in superscript) and are placed in a sequence.

Electronic Configuration is also defined as the distribution of electrons in the various available orbitals of an atom of an element. The sequenced in which the electron occupy the various orbitals is given as follows: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p.. and so on.

Hence, the electronic configuration for calcium is given as 1s²2s²2p⁶3s²3p⁶4s².

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The concentration of arsenic in the groundwater sample is 36.67 ppm.

Arsenic is a chemical element with the symbol As and atomic number 33. It is a metalloid, meaning it has properties of both metals and nonmetals. Arsenic is commonly found in the earth's crust and is present in various minerals and rocks.

The concentration of arsenic in the groundwater sample can be expressed in parts per million (ppm) as follows:

ppm = (mass of arsenic/mass of water sample) x[tex]10^6[/tex]

The mass of the water sample is 3.0g, so the mass of arsenic is 1.1 x [tex]10^-5g.[/tex]

ppm =[tex](1.1 x 10^-5g / 3.0g) x 10^6[/tex]

ppm [tex]= (0.00011 / 3) x 10^6[/tex]

ppm = 36.67

Therefore, the concentration of arsenic in the groundwater sample is 36.67 ppm.

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The statement "all liquid and precipitate waste will be placed in a glass bottle waste container in the fume hood. However, Cu and Mg waste will be placed in the solid waste container" is generally true and reflects standard practices in laboratory waste disposal.

In the laboratory, it is important to properly dispose of any waste generated during experiments in order to minimize environmental impact and ensure safety. Liquid and precipitate waste is typically collected in glass bottles, which are more suitable for containing such materials and can be more easily recycled. Glass is also more chemically resistant and less likely to react with the waste materials compared to plastic containers. Furthermore, waste containers should be placed in the fume hood to prevent exposure to any harmful fumes and to minimize any risk of explosion or fire.

On the other hand, solid waste containers are typically used for the disposal of any solid waste materials generated during experiments, such as Cu and Mg waste. Copper (Cu) and magnesium (Mg) are metals that are often used in laboratory experiments and can produce solid waste materials. These solid waste materials can be safely disposed of in a solid waste container, which can be emptied and disposed of as general waste.

It is important to note that laboratory waste disposal practices may vary depending on the specific institution or laboratory. Some laboratories may have their own specific guidelines for waste disposal that should be followed. Additionally, some materials may require special handling or disposal procedures, such as hazardous or radioactive waste. In such cases, additional precautions may be necessary to ensure proper disposal and minimize potential risks to health and the environment.

In conclusion, proper disposal of laboratory waste is essential to maintain a safe and sustainable working environment. Collecting liquid and precipitate waste in glass bottles in the fume hood and solid waste in a designated container, such as Cu and Mg waste, are standard practices in laboratory waste disposal. Laboratories should establish clear guidelines for waste disposal and ensure that all personnel are trained and follow proper waste disposal procedures to ensure safety and environmental responsibility.

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Answer:

2 energy levels

Explanation:

Starting with 2.3621 g of sand, a student divides the mixture into 1.3012 g of naCL, 0.5560 g of siO2, and 0.4503 g of cAcO3. The quantity of recoverable sio 2 So the beginning combination had 21.2066% of silicon dioxide in it.

A residue weighing 1.46g is produced after heating a 1.5 g mixture of SiO2 and Fe2O3 to a high temperature. 3Fe2O32Fe3O4+21O2 is the reaction that causes weight loss. Two double bonds join the two oxygen atoms to the silicon, giving SiO2 its linear structure. On the Si, there aren't any lone pairings. This would represent an instance of sp hybridization. SiO2 is tetrahedral when it is a polymer. SiO2 insulation layers are frequently applied using plasma-enhanced chemical vapor deposition (PECVD), but this method normally needs a relatively high deposition temperature of about 300 C.

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Answer:

Make Recycle Bins Easily Accessible

Ditch Single-Use Waste

Minimise Paper Waste

Designate a Drawer for Scrap Paper

Eco-Friendly Lunches

The giant crusher lifted the boulders and quickly pulverized them into a uniform gray powder.

Pulverization is defined as the process of applying an external force to a solid material of a certain size to destroy it and reduce it into pieces that are smaller than the original size. It has long been done for many materials including ore, glass, ceramics, grains, paints and medicines. The purpose of pulverization are for the pretreatment for separation of active ingredients, production of powder with particle size suitable for the purpose, surface modification of particles, formation of particles composites and the pretreatment of material synthesis. It is being used not only for reducing particle size but also as an operation for developing new materials.

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