In a boiling pot of water are a metal spoon and a wooden spoon of equal masses/size. Which spoon would likely be more painful (higher in temperature) to grab? Assume that both spoons have been in the same pot of boiling water for the same amount of time. Explain this phenomena using the following terms: Heat, Mass, Temperature, Specific Heat Capacity, Heat Flow. Consider all possible factors in your explanation

The mass of solid calcium carbonate is required to produce 2.40 liters of carbon dioxide measured at Standard Temperature and Pressure (STP) is (C) 50.0 g.

Let's learn this step-by-step:

Using stoichiometry, we can determine the mass of CaCO3 needed to form 2.40 L CO2 at STP (standard temperature and pressure).

Since calcium carbonate decomposes into calcium oxide and carbon dioxide as below;

CaCO3(s) → CaO(s) + CO2(g)

We can write the stoichiometry equation of calcium carbonate to carbon dioxide as shown below.

CaCO3(s) → CaO(s) + CO2(g)

1 mol → 1 mol of CO2

Since at STP; 1 mole of gas = 22.4 L

Therefore, 1 mol of CO2 has a volume of 22.4 L at STP.2.40 L of CO2 is therefore;

2.40 L/22.4 L/mol = 0.107 mol CO2

From the equation above,

1 mol of CaCO3 → 1 mol CO20.107 mol CO2 → 0.107 mol CaCO3

The molar mass of CaCO3 is 100 g/mol

0.107 mol CaCO3 → 0.107 x 100 g/mol = 10.7 g of CaCO3 is required to form 2.40 L of CO2 at STP.

Therefore, the answer is option (A) 10.7 g.

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Answer:

1. Metal.

2. Atom.

3. Homogeneous

4. Compounds.

5. Lustrous

6. Saturated.

7. Colloidal; true.

8. Homogeneous.

Explanation:

1. An element which are sonorous are called metal.

2. An element is made up of only one kind of atom.

3. Alloys are homogeneous mixtures.

4. Elements chemically combines in fixed proportion to form compounds.

5. Metals are lustrous and can be polished.

6. A solution in which no more solute can be dissolved is called a saturated solution.

7. Milk is a colloidal solution but vinegar is a true solution.

8. A solution is a homogeneous mixture.

a) CH₂C=CH₂ + C (triple bond) CH₂

b) CH₂C=CH₂ + O (double bond) O + NH₃ → O (double bond) O NH₂ + NH₂

In the given equations, we are asked to show the completion of the reactions. Let's break down each equation separately:

a) CH₂C=CH₂ + C (triple bond) CH₂:

The reactant in this equation is CH₂C=CH₂, which is an alkene. By adding a carbon atom with a triple bond to the molecule, the reaction is completed. The product is C (triple bond) CH₂, representing a terminal alkyne.

b) CH₂C=CH₂ + O (double bond) O + NH₃ → O (double bond) O NH₂ + NH₂:

In this equation, we start with CH₂C=CH₂, an alkene, and add O (double bond) O and NH₃ to complete the reaction. The result is O (double bond) O NH₂, representing a carbamate, and NH₂, indicating the presence of an amino group.

In summary, the completion of the given equations results in the formation of a terminal alkyne (C≡CH₂) in the first case and a carbamate (O=C(ONH₂)₂) along with an amino group (NH₂) in the second case.

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If you started with 1.5 moles of H2 at STP, you would have approximately 33.6 liters of volume of hydrogen (H₂) gas.

To determine the number of liters of H2 you have, we need to consider the conditions under which the gas is being held (i.e. temperature and pressure), as well as the molar volume of H2 at those conditions.

At standard temperature and pressure (STP), which is 0°C (273.15 K) and 1 atm (101.325 kPa), the molar volume of any ideal gas is approximately 22.4 L/mol.

Therefore, at STP, 1.5 moles of H₂ would occupy approximately:

V = n x Vm = 1.5 mol x 22.4 L/mol = 33.6 L

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The complete question is below:

HOW MANY LITERS OF H2 DO YOU HAVE IF YOU START WITH 1.5 MOLES OF H2? (assume STP condition)

The synthesis of acetaminophen from p-aminophenol and acetic anhydride involves an acylation reaction. Here is a simplified mechanism for the synthesis:

Step 1: Protonation of the p-aminophenol: In the presence of an acid catalyst, such as sulfuric acid (H2SO4), the p-aminophenol molecule is protonated, resulting in the formation of the p-aminophenol cation (p-AP+). Step 2: Formation of the acylium ion: Acetic anhydride is then added to the reaction mixture. The acetic anhydride molecule loses one of its oxygen atoms, forming an acylium ion (CH3CO+). Step 3: Nucleophilic attack: The lone pair of electrons on the nitrogen atom of the p-aminophenol cation (p-AP+) acts as a nucleophile and attacks the electrophilic carbon of the acylium ion (CH3CO+). This results in the formation of a new bond between the nitrogen atom and the carbon atom of the acylium ion, while one of the oxygen atoms of the acylium ion is displaced.Step 4: Proton transfer: A proton transfer occurs from the oxygen atom of the acylium ion (now attached to the nitrogen atom) to a nearby molecule or solvent, regenerating the aromaticity of the phenyl ring. Step 5: Tautomerization: The resulting intermediate undergoes tautomerization, where a hydrogen atom is transferred from the hydroxyl group to the adjacent nitrogen atom. This forms the final product, acetaminophen.

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The law of conservation of  mass is obeyed by a balanced chemical equation. The number of moles of KCl produced from 4K is 4KCl.

An equation in which the amount of the reactants and products on both sides of the reaction are equal is defined as the balanced chemical equation. In a balanced equation the number of atoms of each element is same on both sides.

According to the law of conservation of mass, mass can neither be created nor be destroyed. All the balanced chemical equation satisfies this law.

Here when 4K is used the amount of KCl produced is given as:

4K + 2Cl₂ → 4KCl

Here there are 4 'K' atoms and 4 'Cl' atoms. Hence the number of the respective atoms are equal on both sides of the equation.

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Answer:

biosphere

You can even double check on g00gle.

Answer:

Valence electrons are the electrons orbiting the nucleus in the outermost atomic shell of an atom. Electrons that are closer to the nucleus are in filled orbitals and are called core electrons

Explanation:

yup

Answer:

The model cannot show how light bends.

Explanation:

Ionic solids are therefore insulators, which is the right response. Choice "B."

An insulator is any substance that prevents the energy—such as electricity, heat, or cold—from the moving through it easily. Good insulators include glass, plastic, rubber, and  the wood.

The most popular and generally accessible type of insulation, blanket, comes in the form of rolls or batts. Flexible fibres, most frequently fibreglass, make up this substance. Additionally, natural fibres like cotton and sheep's wool are available in batts and rolls, along with artificial fibers and mineral wool.

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Answer:

you can simply answer vl/t1=v2/t2

The statements wrong about cathode rays is none of the given option. All the given option is true about the cathode rays.

The statements for the cathode rays is given as :

A. They travel in straight lines towards cathode. This statement is true about the cathode rays.

B. They produce heating effect. This statement is true about the cathode rays.

C. They carry negative charge. This statement is true about the cathode rays.

D. They produce X-rays when strike with material having high atomic masses. This statement is true about the cathode rays.

Thus, none of the option is incorrect about the cathode rays.

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Without having access to the specific graph you are referring to, I cannot definitively determine which gas is plotted using the y-axis on the right. However, the gases you mentioned are methane (CH4), carbon dioxide (CO2), and nitrous oxide (N2O). It is possible that the graph shows the total of all three gases as well. Please refer to the graph's labels or legend for clarification on which gas is plotted on the right y-axis.

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The given solids are classified as: Diamond- covalent solid, aluminum chloride-Ionic solids, Copper- Metallic solids, dry ice- molecular solids

The classification of a solid depends on the type of chemical bonding between the atoms or molecules that make up the solid. Covalent solids are held together by covalent bonds, ionic solids by ionic bonds, metallic solids by metallic bonds, and molecular solids by intermolecular forces between the molecules.

Some other examples of such solids are:  Covalent solids- Graphite, silicon dioxide (quartz), silicon carbide. Ionic solids- Sodium chloride, magnesium oxide, calcium carbonate, potassium iodide. Metallic solids- Iron, gold, aluminum. Molecular solids- sulfur, ice (solid water), solid nitrogen

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The complete question is:

Classify each of these solids as ionic, molecular, metallic, or covalent (also known as covalent-network solids or macromolecular solids).

Diamond, Aluminum chloride, copper, dry ice.

The elements that have the most similar chemical properties are; N₂, O₂, and F₂. Option C is correct.

Nitrogen (N), oxygen (O), and fluorine (F) are all members of Group 16 (also known as Group VIA or Group 6A) of the periodic table. These elements are known as the chalcogens and share similar chemical properties due to their similar electron configurations and valence electron arrangements.

Nitrogen (N) has the electron configuration 1s₂ 2s₂ 2p₃, oxygen (O) has the electron configuration 1s₂ 2s₂ 2p₄, and fluorine (F) has the electron configuration 1s₂ 2s₂ 2p₅. They all have a tendency to gain electrons to achieve a stable noble gas electron configuration.

These elements readily form covalent bonds with other elements, particularly hydrogen, carbon, and other nonmetals. They are known for their reactivity and ability to form compounds such as nitrogen oxides (NOx), oxygen compounds (such as water and oxides), and fluorides.

Hence, C. is the correct option.

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Answer: exothermic

Explanation: chemical reactions that release energy is called exothermic, and in this case, more energy is being released. (I THINK)

The reaction shown in the picture is exothermic reaction.

The exothermic reaction leads to the release of energy. This energy is often higher than the combined energy of the reactants.

It can be understood that the net amount of energy required to initiate an exothermic reaction is less than the net amount of energy released by the reaction. When a calorimeter, a device used to measure the heat released by a chemical reaction, the net amount of heat energy that flows through the device is equal to the negative of the total energy change of the system.

In the picture, first reactants had high energy and after the formation of the product the energy decreases.

The nuclear fission of one atom of uranium-235 releases more than 2.5 million times the energy that is produced from the combustion of coal.

The fission of one atom can cause a chain reaction in which the neutron from the fission of one uranium-235 atom can strike another atom, leading to its nuclear fission.

Therefore, The reaction shown in the picture is exothermic reaction.

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The statement is true because, A hydrate is a solid ionic compound (or salt) in which water molecules are associated with the ions of the compound.

These water molecules form hydration shells around the ions, forming a lattice structure that helps stabilize the compound.

The hydration shells, which are composed of water molecules, surround the ions of the compound and form a lattice structure. This structure helps to stabilize the compound, as the water molecules attract the ions and effectively bond them together.

Additionally, the hydration shells can also help to protect the ions from reacting with other molecules, preventing the compound from being broken down into its component elements.

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Answer:

Methane (CH4),Carbondioxide green house gases are carbon compounds

Carbon dioxide (CO2) and methane (CH4) are two powerful greenhouse gases produced by the carbon cycle.

Option A would be the right recycling program to reduce the number of synthetic materials that enter the local landfill. Hence option A would be the suitable criteria for the specialist's design.

Option A is correct because, with the providence of the knowledge to recycle synthetic materials, there will be less waste accumulation. Hence most synthetic materials can be expected to be recycled.

Option B is wrong because restricting natural materials from entering the field will further increase the use of synthetic materials. Hence there will be more accumulation of waste.

Option C is wrong because making the residents travel long distances will be tiresome, and the outcome of disposing of them will be little.

Option D is wrong because synthetic materials are valuable in various manufacturing and widely used in our daily lives. Hence we will lose the potential benefits.

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The electron started in the second energy level (n₁ = 2) before transitioning to the third level.

To determine the initial level of the electron in a hydrogen atom, we can use the Rydberg formula, which relates the wavelength of a photon emitted or absorbed during an electron transition to the energy levels in hydrogen:

1/λ = R * (1/n₁² - 1/n₂²)

Where, λ is the wavelength of the photon,

R is the Rydberg constant (approximately 1.097 x 10^7 m^-1),

n₁ is the initial energy level,

n₂ is the final energy level.

Given that, the wavelength of the emitted photon is 1,094 nm (or 1.094 x 10^-6 meters) and the electron transition occurs to the third level (n₂ = 3), we can substitute these values into the formula and solve for n₁:

1/λ = R * (1/n₁² - 1/n₂²)

1/(1.094 x 10^-6) = 1.097 x 10^7 * (1/n₁² - 1/3²)

Simplifying the equation:

1.094 x 10^6 = 1.097 x 10^7 * (1/n₁² - 1/9)

1/n₁² - 1/9 = (1.094 x 10^6) / (1.097 x 10^7)

1/n₁² - 1/9 ≈ 0.0997

1/n₁² ≈ 0.0997 + 1/9

1/n₁² ≈ 0.1997

n₁² ≈ 1 / 0.1997

n₁² ≈ 5.004

n₁ ≈ √5.004

n₁ ≈ 2.24

Therefore, the electron started in the second energy level (n₁ = 2) before transitioning to the third level.

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If 2 isotopes of Osmium existed, Os-190 and Os-191,  one would have the highest percent abundance is Os - 190.

The isotopes are elements of the same family that all have the same number of protons but have the different number of neutrons. The two common type of isotopes of osmium is Os - 190 and the Os - 191. The isotopes whose mass is closer to the the relative atomic mass of osmium would have the highest percentage of the abundance. that is osmium 190.

Thus, If 2 isotopes of Osmium existed, Os-190 and Os-191,  one would have the highest percent abundance is Os-190.

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An alloy is a solid solution of metals or a metal and a non-metal. A liquid solution is a homogeneous mixture where the solvent is a liquid, and a gaseous solution is a homogeneous mixture of gases.

An alloy is formed when two or more metals, or a metal and a non-metal, are combined to create a solid solution. The atoms of the different elements mix together at the atomic level, resulting in a homogeneous material with unique properties. For example, bronze is an alloy composed of copper and tin. It possesses enhanced strength and durability compared to its individual components, making it suitable for applications like statues and musical instruments.

A liquid solution consists of a solvent, which is a liquid, and one or more solutes dissolved within it. The solutes can be solid, liquid, or gas. When the solute particles disperse evenly throughout the solvent, a homogeneous mixture is formed. One common example is saltwater, where sodium chloride (the solute) dissolves in water (the solvent) to create a liquid solution.

A gaseous solution is a homogeneous mixture of two or more gases. The gases mix at the molecular level, creating a uniform distribution of gas particles. An example of a gaseous solution is air, which is primarily composed of nitrogen, oxygen, carbon dioxide, and other trace gases. The different gases in air mix thoroughly, resulting in a well-blended gaseous solution.

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Answer:

the answer is 1

the  coefficient needed to balance this equation is 1

Explanation:

The efficiency of a machine is the ratio of the output work it performs to the input work required to operate it. This ratio is expressed as a percentage, and it tells you how much of the input work is converted into useful output work.

For example, if a machine requires 10 units of input work to perform 5 units of output work, its efficiency would be 50%. This means that 50% of the input work is converted into useful output work, while the remaining 50% is lost as waste heat, friction, or other forms of energy dissipation.

In general, the efficiency of a machine is determined by its design, as well as the materials and components used to construct it. Machines that are well-designed and constructed with high-quality materials will typically have higher efficiencies than those that are poorly designed or made with lower-quality materials.

It's also important to note that the efficiency of a machine can vary depending on the type and amount of work it is performing. For example, a machine may be more efficient at performing certain tasks than others, or it may become less efficient as it wears out or is subjected to heavy use.

Answer:

Concept of chemi-fluorescence

Explanation:

A glow stick usually consists of two chemicals in a larger plastic tube: , a base catalyst (mostly sodium salicylate), and a suitable dye (sensitizer, or fluorophor). This creates an exergonic reaction when mixed together.

When a glow stick is bent, the flurophor which is a chemical that easily re-emits light upon excitation in smaller capsules is released into the other substance, there by causing it to emit radiation/light in the uv-visible region. The brightness and longevity of the glow stick is determined by varying the concentration of these chemicals.

I hope this explanation clarifies things.

Answer:

16.68 m/s

Explanation:

The following data were obtained from the question:

Height (h) = 14.2 m

Initial Velocity (u) = 0 m/s

Final velocity (v) =?

Thus, the velocity (v) with which the ball hit the ground can be obtained as follow:

v² = u² + 2gh

NOTE: the acceleration due to gravity (g) = 9.8 m/s²

v² = u² + 2gh

v² = 0² + 2 × 9.8 × 14.2

v² = 0 + 278.32

v² = 278.32

Take the square root of both side

v = √278.32

v = 16.68 m/s

Therefore, the velocity with which the ball hit the ground is 16.68 m/s

Answer:

Cl-35 isotope is more abundant.

Explanation:

How to calculate the abundance of isotopes in a mixture from the mass of isotopes and the average atomic mass of the element?

Solution :

Say the % abundance of Cl - 35 is x, i.e, 100 units of Cl contains x units of Cl-35.

Therefore, the % abundance of Cl - 37 is (100 - x).

∴ [35 x + 37 (100-x)] = 35.45 x 100

Simplifying the above equation, we get

-2x + 3700 = 3545

Subtracting 3700 from both sides of the equation, we get

-2x = -155

or, 2x = 155

Dividing both sides of the equation by 2, we get

x = 155 ÷ 2 = 77.5

∴ 100 -x = 22.5

Thus, Cl-35 is more abundant (77.5%) than Cl-37 (22.5%).

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